Document:

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                                                                    Exhibit 4.7

     THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, OR THE SECURITIES LAWS OF ANY STATE AND MAY NOT BE SOLD, TRANSFERRED OR
OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT OR
EXEMPTION FROM REGISTRATION UNDER THE FOREGOING LAWS.

     SUBJECT TO THE PROVISIONS OF SECTION 10 HEREOF, THIS WARRANT SHALL BE VOID
AFTER 5:00 P.M. EASTERN TIME ON FEBRUARY 25, 2007 (the "EXPIRATION DATE").

     THIS WARRANT AND THE SHARES UNDERLYING THE WARRANT ARE SUBJECT TO A
ONE-YEAR PROHIBITION ON THE HOLDER'S ABILITY TO SELL, TRANSFER OR OTHERWISE
DISPOSE OF SUCH SECURITIES AS SET FORTH IN SECTION 5.11 OF THE PURCHASE
AGREEMENT DATED FEBRUARY 12, 2002, A COPY OF WHICH MAY BE REQUESTED FREE OF
CHARGE FROM THE COMPANY.

No. 2002 MC-
            ------

                              AMERIGON INCORPORATED

                     WARRANT TO PURCHASE              SHARES OF
                                        --------------
                            COMMON STOCK, NO PAR VALUE

     For VALUE RECEIVED,                ("Warrantholder"), is entitled to
                        ----------------
purchase, subject to the provisions of this Warrant, from Amerigon Incorporated,
a California corporation ("Company"), at any time not later than 5:00 P.M.,
Eastern time, on the Expiration Date, at an exercise price per share equal to
$2.00 (the exercise price in effect being herein called the "Warrant Price"),
            shares ("Warrant Shares") of the Company's Common Stock, no par
------------
value ("Common Stock"). The number of Warrant Shares purchasable upon exercise
of this Warrant and the Warrant Price shall be subject to adjustment from time
to time as described herein.

     Section 1. Registration. The Company shall maintain books for the transfer
                ------------
and registration of the Warrant. Upon the initial issuance of this Warrant, the
Company shall issue and register the Warrant in the name of the Warrantholder.

     Section 2. Transfers. As provided herein, this Warrant may be transferred
                ---------
only pursuant to a registration statement filed under the Securities Act of
1933, as amended ("Securities Act"), or an exemption from such registration.
Subject to such restrictions, the Company shall transfer this Warrant from time
to time upon the books to be maintained by the Company for that purpose, upon
surrender thereof for transfer properly endorsed or accompanied by appropriate
instructions for transfer and such other documents as may be reasonably required
by the Company, including, if required by the Company, an opinion of its
<PAGE>

counsel to the effect that such transfer is exempt from the registration
requirements of the Securities Act of 1933, to establish that such transfer is
being made in accordance with the terms hereof, and a new Warrant shall be
issued to the transferee and the surrendered Warrant shall be canceled by the
Company.

     Section 3. Exercise of Warrant. Subject to the provisions hereof, the
                -------------------
Warrantholder may exercise this Warrant in whole or in part at any time upon
surrender of the Warrant, together with delivery of the duly executed Warrant
exercise form attached hereto as Appendix A (the "Exercise Agreement") and
payment by cash, certified check or wire transfer of funds for the aggregate
Warrant Price for that number of Warrant Shares then being purchased, to the
Company during normal business hours on any business day at the Company's
principal executive offices (or such other office or agency of the Company as it
may designate by notice to the holder hereof). The Warrant Shares so purchased
shall be deemed to be issued to the holder hereof or such holder's designee, as
the record owner of such shares, as of the close of business on the date on
which this Warrant shall have been surrendered (or evidence of loss, theft or
destruction thereof and security or indemnity satisfactory to the Company), the
Warrant Price shall have been paid and the completed Exercise Agreement shall
have been delivered. Certificates for the Warrant Shares so purchased,
representing the aggregate number of shares specified in the Exercise Agreement,
shall be delivered to the holder hereof within a reasonable time, not exceeding
three (3) business days, after this Warrant shall have been so exercised. The
certificates so delivered shall be in such denominations as may be requested by
the holder hereof and shall be registered in the name of such holder or such
other name as shall be designated by such holder. If this Warrant shall have
been exercised only in part, then, unless this Warrant has expired, the Company
shall, at its expense, at the time of delivery of such certificates, deliver to
the holder a new Warrant representing the number of shares with respect to which
this Warrant shall not then have been exercised. As used herein, "business day"
means a day, other than a Saturday or Sunday, on which banks in New York City
and California are open for the general transaction of business. Each exercise
hereof shall constitute the re-affirmation by the Warrantholder that the
representations and warranties contained in Sections 5.3, 5.4, 5.5, 5.6, 5.7,
5.8 and 5.9 of the Purchase Agreement (as defined below) are true and correct in
all material respects with respect to the Warrantholder as of the time of such
exercise.

     Section 4. Compliance with the Securities Act of 1933. The Company may
                ------------------------------------------
cause the legend set forth on the first page of this Warrant to be set forth on
each Warrant or similar legend on any security issued or issuable upon exercise
of this Warrant, unless counsel for the Company is of the opinion as to any such
security that such legend is unnecessary.

     Section 5. Payment of Taxes. The Company will pay any documentary stamp
                ----------------
taxes attributable to the initial issuance of Warrant Shares issuable upon the
exercise of the Warrant; provided, however, that the Company shall not be
required to pay any tax or taxes which may be payable in respect of any transfer
involved in the issuance or delivery of any certificates for Warrant Shares in a
name other than that of the registered holder of this Warrant in respect of
which such shares are issued, and in such case, the Company shall not be
required to issue or deliver any certificate for Warrant Shares or any Warrant
until the person requesting the same has paid to the Company the amount of such
tax or has established to the Company's reasonable

                                       -2-
<PAGE>

satisfaction that such tax has been paid. The holder shall be responsible for
income and gift taxes due under federal, state or other law, if any such tax is
due.

     Section 6. Mutilated or Missing Warrants. In case this Warrant shall be
                -----------------------------
mutilated, lost, stolen, or destroyed, the Company shall issue in exchange and
substitution of and upon cancellation of the mutilated Warrant, or in lieu of
and substitution for the Warrant lost, stolen or destroyed, a new Warrant of
like tenor and for the purchase of a like number of Warrant Shares, but only
upon receipt of evidence reasonably satisfactory to the Company of such loss,
theft or destruction of the Warrant, and with respect to a lost, stolen or
destroyed Warrant, reasonable indemnity or bond with respect thereto, if
requested by the Company.

     Section 7. Reservation of Common Stock. The Company hereby represents and
                ---------------------------
warrants that there have been reserved, and the Company shall at all applicable
times keep reserved until issued (if necessary) as contemplated by this Section
7, out of the authorized and unissued shares of Common Stock, sufficient shares
to provide for the exercise of the rights of purchase represented by this
Warrant. The Company agrees that all Warrant Shares issued upon exercise of the
Warrant shall be, at the time of delivery of the certificates for such Warrant
Shares upon the due exercise of this Warrant, duly authorized, validly issued,
fully paid and non-assessable shares of Common Stock of the Company.

     Section 8. Adjustments. Subject and pursuant to the provisions of this
                -----------
Section 8, the Warrant Price and number of Warrant Shares subject to this
Warrant shall be subject to adjustment from time to time as set forth
hereinafter.

          (a) If the Company shall, at any time or from time to time while this
Warrant is outstanding, pay a dividend or make a distribution on its Common
Stock in shares of Common Stock, subdivide its outstanding shares of Common
Stock into a greater number of shares or combine its outstanding shares of
Common Stock into a smaller number of shares or issue by reclassification of its
outstanding shares of Common Stock any shares of its capital stock (including
any such reclassification in connection with a consolidation or merger in which
the Company is the continuing corporation), then the number of Warrant Shares
purchasable upon exercise of the Warrant and the Warrant Price in effect
immediately prior to the date upon which such change shall become effective,
shall be adjusted by the Company so that the Warrantholder thereafter exercising
the Warrant shall be entitled to receive the number of shares of Common Stock or
other capital stock which the Warrantholder would have received if the Warrant
had been exercised immediately prior to such event upon payment of a Warrant
Price that has been adjusted to reflect a fair allocation of the economics of
such event to the Warrantholder. Such adjustments shall be made successively
whenever any event listed above shall occur.

          (b) If any capital reorganization, reclassification of the capital
stock of the Company, consolidation or merger of the Company with another
corporation in which the Company is not the survivor, or sale, transfer or other
disposition of all or substantially all of the Company's assets to another
corporation shall be effected, then, as a condition of such reorganization,
reclassification, consolidation, merger, sale, transfer or other disposition,
lawful and adequate provision shall be made whereby each Warrantholder shall
thereafter have the right

                                       -3-
<PAGE>

to purchase and receive upon the basis and upon the terms and conditions herein
specified and in lieu of the Warrant Shares immediately theretofore issuable
upon exercise of the Warrant, such shares of stock, securities or assets
(including cash) as would have been issuable or payable with respect to or in
exchange for a number of Warrant Shares equal to the number of Warrant Shares
immediately theretofore issuable upon exercise of the Warrant, had such
reorganization, reclassification, consolidation, merger, sale, transfer or other
disposition not taken place, and in any such case appropriate provision shall be
made with respect to the rights and interests of each Warrantholder to the end
that the provisions hereof (including, without limitation, provision for
adjustment of the Warrant Price) shall thereafter be applicable, as nearly
equivalent as may be practicable in relation to any shares of stock, securities
or assets (including cash) thereafter deliverable upon the exercise thereof. The
Company shall not effect any such consolidation, merger, sale, transfer or other
disposition unless prior to or simultaneously with the consummation thereof the
successor corporation (if other than the Company) resulting from such
consolidation or merger, or the corporation purchasing or otherwise acquiring
such assets or other appropriate corporation or entity shall assume the
obligation to deliver to the holder of the Warrant such shares of stock,
securities or assets as, in accordance with the foregoing provisions, such
holder may be entitled to purchase, and the other obligations under this
Warrant. The provisions of this paragraph (b) shall similarly apply to
successive reorganizations, reclassifications, consolidations, mergers, sales,
transfers or other dispositions.

          (c) In case the Company shall fix a payment date for the making of a
distribution to all holders of Common Stock (including any such distribution
made in connection with a consolidation or merger in which the Company is the
continuing corporation) of evidences of indebtedness or assets (other than (i)
cash dividends or cash distributions payable out of consolidated earnings or
earned surplus, (ii) dividends or distributions referred to in Section 8(a), or
(iii) distributions of the assets or equity interests of BSST LLC, a Delaware
limited liability company (or its successor in interest)), or subscription
rights or warrants, the Warrant Price to be in effect after such payment date
shall be determined by multiplying the Warrant Price in effect immediately prior
to such payment date by a fraction, the numerator of which shall be the total
number of shares of Common Stock outstanding multiplied by the Market Price (as
defined below) per share of Common Stock immediately prior to such payment date,
less the fair market value (as determined by the Company's Board of Directors in
good faith) of said assets or evidences of indebtedness so distributed, or of
such subscription rights or warrants, and the denominator of which shall be the
total number of shares of Common Stock outstanding multiplied by such Market
Price per share of Common Stock immediately prior to such payment date. "Market
Price" as of a particular date (the "Valuation Date") shall mean the following:
(a) if the Common Stock is then listed on a national stock exchange, the closing
sale price of one share of Common Stock on such exchange on the last trading day
prior to the Valuation Date; (b) if the Common Stock is then quoted on the
NASDAQ Stock Market, Inc. National Market System or SmallCap Market System
("Nasdaq"), the closing sale price of one share of Common Stock on Nasdaq on the
last trading day prior to the Valuation Date or, if no such closing sale price
is available, the average of the high bid and the low asked price quoted on
Nasdaq on the last trading day prior to the Valuation Date; or (c) if the Common
Stock is not then listed on a national stock exchange or quoted on Nasdaq, the
Fair Market Value of one share of Common Stock as of the Valuation Date, shall
be determined in good faith by the Board of Directors of the

                                       -4-
<PAGE>

Company and the Warrantholder. The Board of Directors of the Company shall
respond promptly, in writing, to an inquiry by the Warrantholder prior to the
exercise hereunder as to the Market Value of a share of Common Stock as
determined by the Board of Directors of the Company. In the event that the Board
of Directors of the Company and the Warrantholder are unable to agree upon the
Market Value in respect of subpart (c) hereof, the Company and the Warrantholder
shall jointly select an appraiser, who is experienced in such matters. The
decision of such appraiser shall be final and conclusive, and the cost of such
appraiser shall be borne evenly by the Company and the Warrantholder. Such
adjustment shall be made successively whenever such a payment date is fixed.

          (d) For the term of this Warrant, in addition to the provisions
contained above, the Warrant Price shall be subject to adjustment as provided
below. An adjustment to the Warrant Price shall become effective immediately
after the payment date in the case of each dividend or distribution and
immediately after the effective date of each other event which requires an
adjustment.

          (e) In the event that, as a result of an adjustment made pursuant to
this Section 8, the holder of this Warrant shall become entitled to receive any
shares of capital stock of the Company other than shares of Common Stock, the
number of such other shares so receivable upon exercise of this Warrant shall be
subject thereafter to adjustment from time to time in a manner and on terms as
nearly equivalent as practicable to the provisions with respect to the Warrant
Shares contained in this Warrant.

          (f) Except as provided in subsection (g) hereof, if and whenever the
Company shall issue or sell, or is, in accordance with any of subsections (f)(l)
through (f)(6) hereof, deemed to have issued or sold, any shares of Common Stock
for a consideration per share less than the Warrant Price in effect immediately
prior to the time of such issue or sale, then and in each such case (a "Trigger
Issuance") the then-existing Warrant Price, shall be reduced, as of the close of
business on the effective date of the Trigger Issuance, to a price determined as
follows:

          Adjusted Warrant Price = (A x B) + D
                                   -----------
                                       A+C

                    where

                    "A" equals the number of shares of Common Stock outstanding,
including Additional Shares (as defined below) deemed to be issued hereunder
(whether deemed to be issued prior to, on or after the date hereof), immediately
preceding such Trigger Issuance;

                    "B" equals the Warrant Price in effect immediately preceding
such Trigger Issuance;

                    "C" equals the number of Additional Shares of Common Stock
issued or deemed issued hereunder as a result of the Trigger Issuance; and

                                       -5-
<PAGE>

                    "D" equals the aggregate consideration, if any, received or
deemed to be received by the Company upon such Trigger Issuance;

               provided, however, that in no event shall the Warrant Price after
giving effect to such Trigger Issuance be greater than the Warrant Price in
effect prior to such Trigger Issuance.

          For purposes of this subsection (f), "Additional Shares of Common
Stock" shall mean all shares of Common Stock issued by the Company or deemed to
be issued pursuant to this subsection (f), other than Excluded Issuances (as
defined in subsection (g) hereof).

          For purposes of this subsection (f), the following subsections (f)(l)
to (f)(6) shall also be applicable (subject, in each such case, to the
provisions of subsection (g) hereof) and to each other subsection contained in
this subsection (f):

               (f)(1) Issuance of Rights or Options. In case at any time the
          Company shall in any manner grant (directly and not by assumption in a
          merger or otherwise) any warrants or other rights to subscribe for or
          to purchase, or any options for the purchase of, Common Stock or any
          stock or security convertible into or exchangeable for Common Stock
          (such warrants, rights or options being called "Options" and such
          convertible or exchangeable stock or securities being called
          "Convertible Securities") whether or not such Options or the right to
          convert or exchange any such Convertible Securities are immediately
          exercisable, and the price per share for which Common Stock is
          issuable upon the exercise of such Options or upon the conversion or
          exchange of such Convertible Securities (determined by dividing (i)
          the sum (which sum shall constitute the applicable consideration) of
          (x) the total amount, if any, received or receivable by the Company as
          consideration for the granting of such Options, plus (y) the aggregate
          amount of additional consideration payable to the Company upon the
          exercise of all such Options, plus (z), in the case of such Options
          which relate to Convertible Securities, the aggregate amount of
          additional consideration, if any, payable upon the issue or sale of
          such Convertible Securities and upon the conversion or exchange
          thereof, by (ii) the total maximum number of shares of Common Stock
          issuable upon the exercise of such Options or upon the conversion or
          exchange of all such Convertible Securities issuable upon the exercise
          of such Options) shall be less than the Warrant Price in effect
          immediately prior to the time of the granting of such Options, then
          the total number of shares of Common Stock issuable upon the exercise
          of such Options or upon conversion or exchange of the total amount of
          such Convertible Securities issuable upon the exercise of such Options
          shall be deemed to have been issued for such price per share as of the
          date of granting of such Options or the issuance of such Convertible
          Securities and thereafter shall be deemed to be outstanding for
          purposes of adjusting the Warrant Price. Except as otherwise provided
          in subsection 8(f)(3), no adjustment of the Warrant Price shall be
          made upon the actual issue of such Common Stock

                                       -6-
<PAGE>

          or of such Convertible Securities upon exercise of such Options or
          upon the actual issue of such Common Stock upon conversion or exchange
          of such Convertible Securities.

               (f)(2) Issuance of Convertible Securities. In case the Company
          shall in any manner issue (directly and not by assumption in a merger
          or otherwise) or sell any Convertible Securities, whether or not the
          rights to exchange or convert any such Convertible Securities are
          immediately exercisable, and the price per share for which Common
          Stock is issuable upon such conversion or exchange (determined by
          dividing (i) the sum (which sum shall constitute the applicable
          consideration) of (x) the total amount received or receivable by the
          Company as consideration for the issue or sale of such Convertible
          Securities, plus (y) the aggregate amount of additional consideration,
          if any, payable to the Company upon the conversion or exchange
          thereof, by (ii) the total number of shares of Common Stock issuable
          upon the conversion or exchange of all such Convertible Securities)
          shall be less than the Warrant Price in effect immediately prior to
          the time of such issue or sale, then the total maximum number of
          shares of Common Stock issuable upon conversion or exchange of all
          such Convertible Securities shall be deemed to have been issued for
          such price per share as of the date of the issue or sale of such
          Convertible Securities and thereafter shall be deemed to be
          outstanding for purposes of adjusting the Warrant Price, provided that
          (a) except as otherwise provided in subsection 8(f)(3), no adjustment
          of the Warrant Price shall be made upon the actual issuance of such
          Common Stock upon conversion or exchange of such Convertible
          Securities and (b) no further adjustment of the Warrant Price shall be
          made by reason of the issue or sale of Convertible Securities upon
          exercise of any Options to purchase any such Convertible Securities
          for which adjustments of the Warrant Price have been made pursuant to
          the other provisions of subsection 8(f).

               (f)(3) Change in Option Price or Conversion Rate. Upon the
          happening of any of the following events, namely, if the purchase
          price provided for in any Option referred to in subsection 8(f)(l)
          hereof, the additional consideration, if any, payable upon the
          conversion or exchange of any Convertible Securities referred to in
          subsections 8(f)(l) or 8(f)(2), or the rate at which Convertible
          Securities referred to in subsections 8(f)(l) or 8(f)(2) are
          convertible into or exchangeable for Common Stock shall change at any
          time (including, but not limited to, changes under or by reason of
          provisions designed to protect against dilution), the Warrant Price in
          effect at the time of such event shall forthwith be readjusted to the
          Warrant Price which would have been in effect at such time had such
          Options or Convertible Securities still outstanding provided for such
          changed purchase price, additional consideration or conversion rate,
          as the case may be, at the time initially granted, issued or sold. On
          the termination of any Option for which any adjustment was made
          pursuant to this subsection 8(f) or any right to convert or exchange
          Convertible Securities for which any adjustment was made pursuant to
          this subsection 8(f) (including without limitation upon the redemption
          or purchase for consideration of Convertible Securities by the
          Company), the Warrant Price

                                       -7-
<PAGE>

          then in effect hereunder shall forthwith be changed to the Warrant
          Price which would have been in effect at the time of such termination
          had such Option or Convertible Securities, to the extent outstanding
          immediately prior to such termination, never been issued.

               (f)(4) Consideration for Stock. In case any shares of Common
          Stock, Options or Convertible Securities shall be issued or sold for
          cash, the consideration received therefor shall be deemed to be the
          cash amount received by the Company therefor, without deduction
          therefrom of any expenses incurred or any underwriting commissions or
          concessions paid or allowed by the Company in connection therewith. In
          case any shares of Common Stock, Options or Convertible Securities
          shall be issued or sold for a consideration other than cash, the
          amount of the consideration other than cash received by the Company
          shall be deemed to be the fair value of such consideration as
          determined in good faith by the Board of Directors of the Company,
          after deduction of any expenses incurred or any underwriting
          commissions or concessions paid or allowed by the Company in
          connection therewith. In case any Options shall be issued in
          connection with the issue and sale of other securities of the Company,
          together comprising one integral transaction in which no specific
          consideration is allocated to such Options by the parties thereto,
          such Options shall be deemed to have been issued for such
          consideration as determined in good faith by the Board of Directors of
          the Company.

               (f)(5) Record Date. In case the Company shall take a record of
          the holders of its Common Stock for the purpose of entitling them (i)
          to receive a dividend or other distribution payable in Common Stock,
          Options or Convertible Securities or (ii) to subscribe for or purchase
          Common Stock, Options or Convertible Securities, then such record date
          shall be deemed to be the date of the issue or sale of the shares of
          Common Stock deemed to have been issued or sold upon the declaration
          of such dividend or the making of such other distribution or the date
          of the granting of such right of subscription or purchase, as the case
          may be.

               (f)(6) Treasury Shares. The number of shares of Common Stock
          outstanding at any given time shall not include shares owned or held
          by or for the account of the Company or any of its wholly-owned
          subsidiaries, and the disposition of any such shares (other than the
          cancellation or retirement thereof) shall be considered an issue or
          sale of Common Stock for the purpose of this subsection (f).

          (g) Anything herein to the contrary notwithstanding, the Company shall
not be required to make any adjustment of the Warrant Price in the case of the
issuance of (A) capital stock, Options or Convertible Securities issued to
directors, officers, employees or consultants of the Company in connection with
their service as directors of the Company, their employment by the Company or
their retention as consultants by the Company pursuant to an equity compensation
program approved by the Board of Directors or the shareholders of the Company,

                                       -8-
<PAGE>

(B) shares of Common Stock upon the conversion or exercise of Options or
Convertible Securities issued prior to the date hereof, (C) shares of Common
Stock and Convertible Securities issued to Big Beaver Investments, LLC pursuant
to the terms of the Exchange Agreement, dated February 12, 2002, and shares of
Common Stock issuable upon the exercise or conversion of such Convertible
Securities in accordance with their terms, (D) Convertible Securities issued to
Roth Capital in payment of the placement agency fees as disclosed in the
Purchase Agreement; and shares of Common Stock issuable upon the exercise or
conversion of such Convertible Securities in accordance with their terms, and
(E) shares of Common Stock issued or issuable by reason of a dividend, stock
split or other distribution on the Common Stock (but only to the extent that
such a dividend, split or distribution results in an adjustment in the Warrant
Price pursuant to the other provisions of this Warrant) (collectively, "Excluded
Issuances").

     Section 9. Fractional Interest. The Company shall not be required to issue
                -------------------
fractions of Warrant Shares upon the exercise of the Warrant. If any fractional
share of Common Stock would, except for the provisions of the first sentence of
this Section 9, be delivered upon such exercise, the Company, in lieu of
delivering such fractional share, shall pay to the exercising holder of this
Warrant an amount in cash equal to the Fair Market Value of such fractional
share of Common Stock on the date of exercise. As used in this Warrant, "Fair
Market Value" of a share of Common Stock as of a particular date (the "Valuation
Date") shall mean the following: (a) if the Common Stock is then listed on a
national stock exchange, the closing sale price of one share of Common Stock on
such exchange on the last trading day prior to the Valuation Date; (b) if the
Common Stock is then quoted on Nasdaq, the closing sale price of one share of
Common Stock on Nasdaq on the last trading day prior to the Valuation Date or,
if no such closing sale price is available, the average of the high bid and the
low sales price quoted on Nasdaq on the last trading day prior to the Valuation
Date; or (c) if the Common Stock is not then listed on a national stock exchange
or quoted on Nasdaq, the Fair Market Value of one share of Common Stock as of
the Valuation Date, shall be determined in good faith by the Board of Directors
of the Company.

     Section 10. Extension of Expiration Date. If the Company fails to cause any
                 ----------------------------
Registration Statement covering Registrable Securities (unless otherwise defined
herein, capitalized terms are as defined in the Registration Rights Agreement
dated of even date herewith (the "Registration Rights Agreement")) to be
declared effective prior to the applicable dates set forth therein and the
Blackout Period (whether alone, or in combination with any other Blackout
Period) continues for more than 60 days in any 12 month period, or for more than
a total of 90 days, then the Expiration Date of this Warrant shall be extended
one day for each day beyond the 60-day or 90-day limits, as the case may be,
that the Blackout Period continues.

     Section 11. Benefits. Nothing in this Warrant shall be construed to give
                 --------
any person, firm or corporation (other than the Company and the Warrantholder)
any legal or equitable right, remedy or claim, it being agreed that this Warrant
shall be for the sole and exclusive benefit of the Company and the
Warrantholder.

                                       -9-
<PAGE>

     Section 12. Notices to Warrantholder. Upon the happening of any event
                 ------------------------
requiring an adjustment of the Warrant Price, the Company shall promptly give
written notice thereof to the Warrantholder at the address appearing in the
records of the Company, stating the adjusted Warrant Price and the adjusted
number of Warrant Shares resulting from such event and setting forth in
reasonable detail the method of calculation and the facts upon which such
calculation is based. Failure to give such notice to the Warrantholder or any
defect therein shall not affect the legality or validity of the subject
adjustment.

     Section 13. Identity of Transfer Agent. The Transfer Agent for the Common
                 --------------------------
Stock is US Stock Transfer. Upon the appointment of any subsequent transfer
agent for the Common Stock or other shares of the Company's capital stock
issuable upon the exercise of the rights of purchase represented by the Warrant,
the Company will mail to the Warrantholder a statement setting forth the name
and address of such transfer agent.

     Section 14. Notices. Unless otherwise provided, any notice required or
                 -------
permitted under this Warrant shall be given in writing and shall be deemed
effectively given as hereinafter described (i) if given by personal delivery,
then such notice shall be deemed given upon such delivery, (ii) if given by
telex or telecopier, then such notice shall be deemed given upon receipt of
confirmation of complete transmittal, (iii) if given by mail, then such notice
shall be deemed given upon the earlier of (A) receipt of such notice by the
recipient or (B) three days after such notice is deposited in first class mail,
postage prepaid, and (iv) if given by an internationally recognized overnight
air courier, then such notice shall be deemed given one day after delivery to
such carrier. All notices shall be addressed as follows: (i) if to the
Warrantholder, at its address as set forth in the Company's books and records
and, if to the Company, at the address as follows, or at such other address as
the Warrantholder or the Company may designate by ten days' advance written
notice to the other:

                    If to the Company:

                          Amerigon Incorporated
                          5462 Irwindale Avenue
                          Irwindale, California 91706
                          Attention:  Chief Executive Officer
                          Fax:  626.815.7441

                    With a copy to:

                          O'Melveny & Myers LLP
                          400 South Hope Street
                          Los Angeles, California  90071
                          Attention:  John A. Laco
                          Fax:  213.430.6407

     Section 15. Registration Rights. The initial holder of this Warrant is
                 -------------------
entitled to the benefit of certain registration rights with respect to the
shares of Common Stock issuable upon

                                      -10-
<PAGE>

the exercise of this Warrant as provided in the Registration Rights Agreement,
and any subsequent holder hereof may be entitled to such rights.

     Section 16. Successors. All the covenants and provisions hereof by or for
                 ----------
the benefit of the Warrantholder shall bind and inure to the benefit of its
respective successors and assigns hereunder.

     Section 17. Governing Law. This Warrant shall be governed by, and construed
                 -------------
in accordance with, the internal laws of the State of New York, without
reference to the choice of law provisions thereof. The Company and, by accepting
this Warrant, the Warrantholder, each irrevocably submits to the exclusive
jurisdiction of the courts of the State of New York located in New York County
and the United States District Court for the Southern District of New York for
the purpose of any suit, action, proceeding or judgment relating to or arising
out of this Warrant and the transactions contemplated hereby. Service of process
in connection with any such suit, action or proceeding may be served on each
party hereto anywhere in the world by the same methods as are specified for the
giving of notices under this Warrant. The Company and, by accepting this
Warrant, the Warrantholder, each irrevocably consents to the jurisdiction of any
such court in any such suit, action or proceeding and to the laying of venue in
such court. The Company and, by accepting this Warrant, the Warrantholder, each
irrevocably waives any objection to the laying of venue of any such suit, action
or proceeding brought in such courts and irrevocably waives any claim that any
such suit, action or proceeding brought in any such court has been brought in an
inconvenient forum.

     Section 18. Call Provision. Notwithstanding any other provision contained\
                 --------------
herein to the contrary, in the event that the closing bid price of a share of
Common Stock as traded on the Nasdaq (or such other exchange or stock market on
which the Common Stock may then be listed or quoted) exceeds $4.00
(appropriately adjusted for any stock split, reverse stock split, stock dividend
or other reclassification or combination of the Common Stock occurring after the
date hereof) for twenty (20) consecutive trading sessions and all of the shares
of Common Stock issuable hereunder either (i) are registered pursuant to an
effective Registration Statement (as defined in the Registration Rights
Agreement) which is available for sales of such shares of Common Stock or (ii)
no longer constitute Registrable Securities (as defined in the Registration
Rights Agreement), the Company, upon thirty (30) days prior written notice (the
"Notice Period") following such twenty (20) day period, to the Warrantholder,
may call this Warrant, in whole but not in part, at a redemption price equal to
$0.01 per share of Common Stock then purchasable pursuant to this Warrant;
provided, however, that the Company simultaneously redeems all Company Warrants
(as defined in Section 20 below) on the same terms. Notwithstanding any such
notice by the Company, the Warrantholder shall have the right to exercise this
Warrant prior to the end of the Notice Period.

     Section 19. No Rights as Stockholder. Prior to the exercise of this
                 ------------------------
Warrant, the Warrantholder shall not have or exercise any rights as a
stockholder of the Company by virtue of its ownership of this Warrant.

                                      -11-
<PAGE>

     Section 20. Prohibition on Transfer. This Warrant and the Warrant Shares
                 -----------------------
are subject to a one-year prohibition on the Warrantholder's ability to sell,
transfer or otherwise dispose of such securities as set forth in Section 5.11 of
the Purchase Agreement dated February 12, 2002, a copy of which may be requested
free of charge from the Company at the address set forth in Section 14.

     Section 21. Amendment; Waiver. This Warrant is one of a series of Warrants
                 -----------------
of like tenor issued by the Company (but not part of the series of Warrants
issued to Special Situations funds or to Big Beaver Investments LLC on the same
date hereof) pursuant to the Purchase Agreement, dated as of February 12, 2002,
among the Company and the original holders of Warrants, except as to the number
of shares of Common Stock subject thereto, and initially covering an aggregate
of 333,334 shares of Common Stock (collectively, the "Company Warrants"). Any
term of this Warrant may be amended or waived (including the adjustment
provisions included in Section 8 of this Warrant) upon the written consent of
the Company and the holders of Company Warrants representing at least 50% of the
number of shares of Common Stock then subject to outstanding Company Warrants
(the "Majority Holders"); provided, that (x) any such amendment or waiver must
apply to all Company Warrants; and (y) the number of Warrant Shares subject to
this Warrant, the Warrant Price and the expiration date of this Warrant may not
be amended, and the right to exercise this Warrant may not be altered or waived,
without the written consent of the Warrantholder.

     Section 22. Section Headings. The section heading in this Warrant are for
                 ----------------
the convenience of the Company and the Warrantholder and in no way alter,
modify, amend, limit or restrict the provisions hereof.

                           [SIGNATURE PAGE TO FOLLOW]

                                      -12-
<PAGE>

     IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed, as of the 25th day of February, 2002.

                                           AMERIGON INCORPORATED

                                           By:
                                              ----------------------------------
                                           Name:
                                           Title:

                                      -13-
<PAGE>

                                   APPENDIX A
                              AMERIGON INCORPORATED
                              WARRANT EXERCISE FORM

To: Amerigon Incorporated

     The undersigned hereby irrevocably elects to exercise the right of purchase
represented by the within Warrant ("Warrant") for, and to purchase thereunder by
the payment of the Warrant Price and surrender of the Warrant,
                                                               -------------
shares of Common Stock ("Warrant Shares") provided for therein, and requests
that certificates for the Warrant Shares be issued as follows:

                      -------------------------------
                      Name

                      --------------------------------
                      Address

                      -------------------------------

                      -------------------------------
                      Federal Tax ID or Social Security No.

   and delivered by (euro) certified mail to the above address, or
                    (euor) electronically (provide DWAC Instructions:      ), or
                                                                     ------
                    (euor) other (specify:                                    ).
                                          ------------------------------------

and, if the number of Warrant Shares shall not be all the Warrant Shares
purchasable upon exercise of the Warrant, that a new Warrant for the balance of
the Warrant Shares purchasable upon exercise of this Warrant be registered in
the name of the undersigned Warrantholder or the undersigned's Assignee as below
indicated and delivered to the address stated below.

Dated:                    ,
      -------------------  ----

Note:  The signature must correspond with       Signature:
the name of the registered holder as written              ----------------------
on the first page of the Warrant in every
particular, without alteration or enlargement   --------------------------------
or any change whatever, unless the Warrant      Name (please print)
has been assigned.

                                                --------------------------------

                                                --------------------------------
                                                Address

                                                --------------------------------
                                                Federal Identification or
                                                Social Security No.

                                                Assignee:

                                                --------------------------------

                                                --------------------------------

                                                --------------------------------<PAGE>

                                                                    Exhibit 4.8

     THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, OR THE SECURITIES LAWS OF ANY STATE AND MAY NOT BE SOLD, TRANSFERRED OR
OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT OR
EXEMPTION FROM REGISTRATION UNDER THE FOREGOING LAWS.

     SUBJECT TO THE PROVISIONS OF SECTION 10 HEREOF, THIS WARRANT SHALL BE VOID
AFTER 5:00 P.M. EASTERN TIME ON FEBRUARY 25, 2007 (the "EXPIRATION DATE").

No. 2002 BBI-1

                              AMERIGON INCORPORATED

                      WARRANT TO PURCHASE 860,301 SHARES OF
                           COMMON STOCK, NO PAR VALUE

     For VALUE RECEIVED, Big Beaver Investments LLC ("Warrantholder"), is
entitled to purchase, subject to the provisions of this Warrant, from Amerigon
Incorporated, a California corporation ("Company"), at any time not later than
5:00 P.M., Eastern time, on the Expiration Date, at an exercise price per share
equal to $2.00 (the exercise price in effect being herein called the "Warrant
Price"), 860,301 shares ("Warrant Shares") of the Company's Common Stock, no par
value ("Common Stock"). The number of Warrant Shares purchasable upon exercise
of this Warrant and the Warrant Price shall be subject to adjustment from time
to time as described herein.

     Section 1. Registration. The Company shall maintain books for the transfer
                ------------
and registration of the Warrant. Upon the initial issuance of this Warrant, the
Company shall issue and register the Warrant in the name of the Warrantholder.

     Section 2. Transfers. As provided herein, this Warrant may be transferred
                ---------
only pursuant to a registration statement filed under the Securities Act of
1933, as amended ("Securities Act"), or an exemption from such registration.
Subject to such restrictions, the Company shall transfer this Warrant from time
to time upon the books to be maintained by the Company for that purpose, upon
surrender thereof for transfer properly endorsed or accompanied by appropriate
instructions for transfer and such other documents as may be reasonably required
by the Company, including, if required by the Company, an opinion of its counsel
to the effect that such transfer is exempt from the registration requirements of
the Securities Act of 1933, to establish that such transfer is being made in
accordance with the terms hereof, and a new Warrant shall be issued to the
transferee and the surrendered Warrant shall be canceled by the Company.
<PAGE>

     Section 3. Exercise of Warrant. Subject to the provisions hereof, the
                -------------------
Warrantholder may exercise this Warrant in whole or in part at any time upon
surrender of the Warrant, together with delivery of the duly executed Warrant
exercise form attached hereto as Appendix A (the "Exercise Agreement") and
payment by cash, certified check or wire transfer of funds for the aggregate
Warrant Price for that number of Warrant Shares then being purchased, to the
Company during normal business hours on any business day at the Company's
principal executive offices (or such other office or agency of the Company as it
may designate by notice to the holder hereof). The Warrant Shares so purchased
shall be deemed to be issued to the holder hereof or such holder's designee, as
the record owner of such shares, as of the close of business on the date on
which this Warrant shall have been surrendered (or evidence of loss, theft or
destruction thereof and security or indemnity satisfactory to the Company), the
Warrant Price shall have been paid and the completed Exercise Agreement shall
have been delivered. Certificates for the Warrant Shares so purchased,
representing the aggregate number of shares specified in the Exercise Agreement,
shall be delivered to the holder hereof within a reasonable time, not exceeding
three (3) business days, after this Warrant shall have been so exercised. The
certificates so delivered shall be in such denominations as may be requested by
the holder hereof and shall be registered in the name of such holder or such
other name as shall be designated by such holder. If this Warrant shall have
been exercised only in part, then, unless this Warrant has expired, the Company
shall, at its expense, at the time of delivery of such certificates, deliver to
the holder a new Warrant representing the number of shares with respect to which
this Warrant shall not then have been exercised. As used herein, "business day"
means a day, other than a Saturday or Sunday, on which banks in New York City
are open for the general transaction of business. Each exercise hereof shall
constitute the re-affirmation by the Warrantholder that the representations and
warranties contained in Sections 5.3, 5.4, 5.5, 5.6, 5.7, 5.8 and 5.9 of the
Exchange Agreement dated as of February 12, 2002 between the Company and the
Warrantholder are true and correct in all material respects with respect to the
Warrantholder as of the time of such exercise.

     Section 4. Compliance with the Securities Act of 1933. The Company may
                ------------------------------------------
cause the legend set forth on the first page of this Warrant to be set forth on
each Warrant or similar legend on any security issued or issuable upon exercise
of this Warrant, unless counsel for the Company is of the opinion as to any such
security that such legend is unnecessary.

     Section 5. Payment of Taxes. The Company will pay any documentary stamp
                ----------------
taxes attributable to the initial issuance of Warrant Shares issuable upon the
exercise of the Warrant; provided, however, that the Company shall not be
required to pay any tax or taxes which may be payable in respect of any transfer
involved in the issuance or delivery of any certificates for Warrant Shares in a
name other than that of the registered holder of this Warrant in respect of
which such shares are issued, and in such case, the Company shall not be
required to issue or deliver any certificate for Warrant Shares or any Warrant
until the person requesting the same has paid to the Company the amount of such
tax or has established to the Company's reasonable satisfaction that such tax
has been paid. The holder shall be responsible for income and gift taxes due
under federal, state or other law, if any such tax is due.

                                     -2-
<PAGE>

     Section 6. Mutilated or Missing Warrants. In case this Warrant shall be
                -----------------------------
mutilated, lost, stolen, or destroyed, the Company shall issue in exchange and
substitution of and upon cancellation of the mutilated Warrant, or in lieu of
and substitution for the Warrant lost, stolen or destroyed, a new Warrant of
like tenor and for the purchase of a like number of Warrant Shares, but only
upon receipt of evidence reasonably satisfactory to the Company of such loss,
theft or destruction of the Warrant, and with respect to a lost, stolen or
destroyed Warrant, reasonable indemnity or bond with respect thereto, if
requested by the Company.

     Section 7. Reservation of Common Stock. The Company hereby represents and
                ---------------------------
warrants that there have been reserved, and the Company shall at all applicable
times keep reserved until issued (if necessary) as contemplated by this Section
7, out of the authorized and unissued shares of Common Stock, sufficient shares
to provide for the exercise of the rights of purchase represented by this
Warrant. The Company agrees that all Warrant Shares issued upon exercise of the
Warrant shall be, at the time of delivery of the certificates for such Warrant
Shares upon the due exercise of this Warrant, duly authorized, validly issued,
fully paid and non-assessable shares of Common Stock of the Company.

     Section 8. Adjustments. Subject and pursuant to the provisions of this
                -----------
Section 8, the Warrant Price and number of Warrant Shares subject to this
Warrant shall be subject to adjustment from time to time as set forth
hereinafter.

          (a) If the Company shall, at any time or from time to time while this
Warrant is outstanding, pay a dividend or make a distribution on its Common
Stock in shares of Common Stock, subdivide its outstanding shares of Common
Stock into a greater number of shares or combine its outstanding shares of
Common Stock into a smaller number of shares or issue by reclassification of its
outstanding shares of Common Stock any shares of its capital stock (including
any such reclassification in connection with a consolidation or merger in which
the Company is the continuing corporation), then the number of Warrant Shares
purchasable upon exercise of the Warrant and the Warrant Price in effect
immediately prior to the date upon which such change shall become effective,
shall be adjusted by the Company so that the Warrantholder thereafter exercising
the Warrant shall be entitled to receive the number of shares of Common Stock or
other capital stock which the Warrantholder would have received if the Warrant
had been exercised immediately prior to such event upon payment of a Warrant
Price that has been adjusted to reflect a fair allocation of the economics of
such event to the Warrantholder. Such adjustments shall be made successively
whenever any event listed above shall occur.

          (b) If any capital reorganization, reclassification of the capital
stock of the Company, consolidation or merger of the Company with another
corporation in which the Company is not the survivor, or sale, transfer or other
disposition of all or substantially all of the Company's assets to another
corporation shall be effected, then, as a condition of such reorganization,
reclassification, consolidation, merger, sale, transfer or other disposition,
lawful and adequate provision shall be made whereby each Warrantholder shall
thereafter have the right to purchase and receive upon the basis and upon the
terms and conditions herein specified and in lieu of the Warrant Shares
immediately theretofore issuable upon exercise of the Warrant, such shares of
stock, securities or assets (including cash) as would have been issuable or
payable with

                                      -3-
<PAGE>

respect to or in exchange for a number of Warrant Shares equal to the number of
Warrant Shares immediately theretofore issuable upon exercise of the Warrant,
had such reorganization, reclassification, consolidation, merger, sale, transfer
or other disposition not taken place, and in any such case appropriate provision
shall be made with respect to the rights and interests of each Warrantholder to
the end that the provisions hereof (including, without limitation, provision for
adjustment of the Warrant Price) shall thereafter be applicable, as nearly
equivalent as may be practicable in relation to any shares of stock, securities
or assets (including cash) thereafter deliverable upon the exercise thereof. The
Company shall not effect any such consolidation, merger, sale, transfer or other
disposition unless prior to or simultaneously with the consummation thereof the
successor corporation (if other than the Company) resulting from such
consolidation or merger, or the corporation purchasing or otherwise acquiring
such assets or other appropriate corporation or entity shall assume the
obligation to deliver to the holder of the Warrant such shares of stock,
securities or assets as, in accordance with the foregoing provisions, such
holder may be entitled to purchase, and the other obligations under this
Warrant. The provisions of this paragraph (b) shall similarly apply to
successive reorganizations, reclassifications, consolidations, mergers, sales,
transfers or other dispositions.

          (c) In case the Company shall fix a payment date for the making of a
distribution to all holders of Common Stock (including any such distribution
made in connection with a consolidation or merger in which the Company is the
continuing corporation) of evidences of indebtedness or assets (other than (i)
cash dividends or cash distributions payable out of consolidated earnings or
earned surplus, (ii) dividends or distributions referred to in Section 8(a), or
(iii) distributions of the assets or equity interests of BSST LLC, a Delaware
limited liability company (or its successor in interest)), or subscription
rights or warrants, the Warrant Price to be in effect after such payment date
shall be determined by multiplying the Warrant Price in effect immediately prior
to such payment date by a fraction, the numerator of which shall be the total
number of shares of Common Stock outstanding multiplied by the Market Price (as
defined below) per share of Common Stock immediately prior to such payment date,
less the fair market value (as determined by the Company's Board of Directors in
good faith) of said assets or evidences of indebtedness so distributed, or of
such subscription rights or warrants, and the denominator of which shall be the
total number of shares of Common Stock outstanding multiplied by such Market
Price per share of Common Stock immediately prior to such payment date. "Market
Price" as of a particular date (the "Valuation Date") shall mean the following:
(a) if the Common Stock is then listed on a national stock exchange, the closing
sale price of one share of Common Stock on such exchange on the last trading day
prior to the Valuation Date; (b) if the Common Stock is then quoted on the
NASDAQ Stock Market, Inc. National Market System or SmallCap Market System
("Nasdaq"), the closing sale price of one share of Common Stock on Nasdaq on the
last trading day prior to the Valuation Date or, if no such closing sale price
is available, the average of the high bid and the low asked price quoted on
Nasdaq on the last trading day prior to the Valuation Date; or (c) if the Common
Stock is not then listed on a national stock exchange or quoted on Nasdaq, the
Fair Market Value of one share of Common Stock as of the Valuation Date, shall
be determined in good faith by the Board of Directors of the Company and the
Warrantholder. The Board of Directors of the Company shall respond promptly, in
writing, to an inquiry by the Warrantholder prior to the exercise hereunder as
to the Market Value of a share of Common Stock as determined by the Board of
Directors of the

                                      -4-
<PAGE>

Company. In the event that the Board of Directors of the Company and the
Warrantholder are unable to agree upon the Market Value in respect of subpart
(c) hereof, the Company and the Warrantholder shall jointly select an appraiser,
who is experienced in such matters. The decision of such appraiser shall be
final and conclusive, and the cost of such appraiser shall be borne evenly by
the Company and the Warrantholder. Such adjustment shall be made successively
whenever such a payment date is fixed.

          (d) For the term of this Warrant, in addition to the provisions
contained above, the Warrant Price shall be subject to adjustment as provided
below. An adjustment to the Warrant Price shall become effective immediately
after the payment date in the case of each dividend or distribution and
immediately after the effective date of each other event which requires an
adjustment.

          (e) In the event that, as a result of an adjustment made pursuant to
this Section 8, the holder of this Warrant shall become entitled to receive any
shares of capital stock of the Company other than shares of Common Stock, the
number of such other shares so receivable upon exercise of this Warrant shall be
subject thereafter to adjustment from time to time in a manner and on terms as
nearly equivalent as practicable to the provisions with respect to the Warrant
Shares contained in this Warrant.

          (f) Except as provided in subsection (g) hereof, if and whenever the
Company shall issue or sell, or is, in accordance with any of subsections (f)(l)
through (f)(6) hereof, deemed to have issued or sold, any shares of Common Stock
for a consideration per share less than the Warrant Price in effect immediately
prior to the time of such issue or sale, then and in each such case (a "Trigger
                                                                        -------
Issuance") the then-existing Warrant Price, shall be reduced, as of the close of
--------
business on the effective date of the Trigger Issuance, to a price determined as
follows:

                      Adjusted Warrant Price = (A x B) + D
                                               -----------
                                                   A+C

               where

               "A" equals the number of shares of Common Stock outstanding,
including Additional Shares (as defined below) deemed to be issued hereunder
(whether deemed to be issued prior to, on or after the date hereof), immediately
preceding such Trigger Issuance;

               "B" equals the Warrant Price in effect immediately preceding such
Trigger Issuance;

               "C" equals the number of Additional Shares of Common Stock issued
or deemed issued hereunder as a result of the Trigger Issuance; and

               "D" equals the aggregate consideration, if any, received or
deemed to be received by the Company upon such Trigger Issuance;

                                      -5-
<PAGE>

               provided, however, that in no event shall the Warrant Price after
giving effect to such Trigger Issuance be greater than the Warrant Price in
effect prior to such Trigger Issuance.

          For purposes of this subsection (f), "Additional Shares of Common
Stock" shall mean all shares of Common Stock issued by the Company or deemed to
be issued pursuant to this subsection (f), other than Excluded Issuances (as
defined in subsection (g) hereof).

          For purposes of this subsection (f), the following subsections (f)(l)
to (f)(6) shall also be applicable (subject, in each such case, to the
provisions of subsection (g) hereof) and to each other subsection contained in
this subsection (f):

               (f)(1) Issuance of Rights or Options. In case at any time the
          Company shall in any manner grant (directly and not by assumption in a
          merger or otherwise) any warrants or other rights to subscribe for or
          to purchase, or any options for the purchase of, Common Stock or any
          stock or security convertible into or exchangeable for Common Stock
          (such warrants, rights or options being called "Options" and such
          convertible or exchangeable stock or securities being called
          "Convertible Securities") whether or not such Options or the right to
          convert or exchange any such Convertible Securities are immediately
          exercisable, and the price per share for which Common Stock is
          issuable upon the exercise of such Options or upon the conversion or
          exchange of such Convertible Securities (determined by dividing (i)
          the sum (which sum shall constitute the applicable consideration) of
          (x) the total amount, if any, received or receivable by the Company as
          consideration for the granting of such Options, plus (y) the aggregate
          amount of additional consideration payable to the Company upon the
          exercise of all such Options, plus (z), in the case of such Options
          which relate to Convertible Securities, the aggregate amount of
          additional consideration, if any, payable upon the issue or sale of
          such Convertible Securities and upon the conversion or exchange
          thereof, by (ii) the total maximum number of shares of Common Stock
          issuable upon the exercise of such Options or upon the conversion or
          exchange of all such Convertible Securities issuable upon the exercise
          of such Options) shall be less than the Warrant Price in effect
          immediately prior to the time of the granting of such Options, then
          the total number of shares of Common Stock issuable upon the exercise
          of such Options or upon conversion or exchange of the total amount of
          such Convertible Securities issuable upon the exercise of such Options
          shall be deemed to have been issued for such price per share as of the
          date of granting of such Options or the issuance of such Convertible
          Securities and thereafter shall be deemed to be outstanding for
          purposes of adjusting the Warrant Price. Except as otherwise provided
          in subsection 8(f)(3), no adjustment of the Warrant Price shall be
          made upon the actual issue of such Common Stock or of such Convertible
          Securities upon exercise of such Options or upon the actual issue of
          such Common Stock upon conversion or exchange of such Convertible
          Securities.

                                      -6-
<PAGE>

               (f)(2) Issuance of Convertible Securities. In case the Company
          shall in any manner issue (directly and not by assumption in a merger
          or otherwise) or sell any Convertible Securities, whether or not the
          rights to exchange or convert any such Convertible Securities are
          immediately exercisable, and the price per share for which Common
          Stock is issuable upon such conversion or exchange (determined by
          dividing (i) the sum (which sum shall constitute the applicable
          consideration) of (x) the total amount received or receivable by the
          Company as consideration for the issue or sale of such Convertible
          Securities, plus (y) the aggregate amount of additional consideration,
          if any, payable to the Company upon the conversion or exchange
          thereof, by (ii) the total number of shares of Common Stock issuable
          upon the conversion or exchange of all such Convertible Securities)
          shall be less than the Warrant Price in effect immediately prior to
          the time of such issue or sale, then the total maximum number of
          shares of Common Stock issuable upon conversion or exchange of all
          such Convertible Securities shall be deemed to have been issued for
          such price per share as of the date of the issue or sale of such
          Convertible Securities and thereafter shall be deemed to be
          outstanding for purposes of adjusting the Warrant Price, provided that
          (a) except as otherwise provided in subsection 8(f)(3), no adjustment
          of the Warrant Price shall be made upon the actual issuance of such
          Common Stock upon conversion or exchange of such Convertible
          Securities and (b) no further adjustment of the Warrant Price shall be
          made by reason of the issue or sale of Convertible Securities upon
          exercise of any Options to purchase any such Convertible Securities
          for which adjustments of the Warrant Price have been made pursuant to
          the other provisions of subsection 8(f).

               (f)(3) Change in Option Price or Conversion Rate. Upon the
          happening of any of the following events, namely, if the purchase
          price provided for in any Option referred to in subsection 8(f)(l)
          hereof, the additional consideration, if any, payable upon the
          conversion or exchange of any Convertible Securities referred to in
          subsections 8(f)(l) or 8(f)(2), or the rate at which Convertible
          Securities referred to in subsections 8(f)(l) or 8(f)(2) are
          convertible into or exchangeable for Common Stock shall change at any
          time (including, but not limited to, changes under or by reason of
          provisions designed to protect against dilution), the Warrant Price in
          effect at the time of such event shall forthwith be readjusted to the
          Warrant Price which would have been in effect at such time had such
          Options or Convertible Securities still outstanding provided for such
          changed purchase price, additional consideration or conversion rate,
          as the case may be, at the time initially granted, issued or sold. On
          the termination of any Option for which any adjustment was made
          pursuant to this subsection 8(f) or any right to convert or exchange
          Convertible Securities for which any adjustment was made pursuant to
          this subsection 8(f) (including without limitation upon the redemption
          or purchase for consideration of Convertible Securities by the
          Company), the Warrant Price then in effect hereunder shall forthwith
          be changed to the Warrant Price which would have been in effect at the
          time of such termination had such Option or Convertible Securities, to
          the extent outstanding immediately prior to such termination, never
          been issued.

                                      -7-
<PAGE>

               (f)(4) Consideration for Stock. In case any shares of Common
          Stock, Options or Convertible Securities shall be issued or sold for
          cash, the consideration received therefor shall be deemed to be the
          cash amount received by the Company therefor, without deduction
          therefrom of any expenses incurred or any underwriting commissions or
          concessions paid or allowed by the Company in connection therewith. In
          case any shares of Common Stock, Options or Convertible Securities
          shall be issued or sold for a consideration other than cash, the
          amount of the consideration other than cash received by the Company
          shall be deemed to be the fair value of such consideration as
          determined in good faith by the Board of Directors of the Company,
          after deduction of any expenses incurred or any underwriting
          commissions or concessions paid or allowed by the Company in
          connection therewith. In case any Options shall be issued in
          connection with the issue and sale of other securities of the Company,
          together comprising one integral transaction in which no specific
          consideration is allocated to such Options by the parties thereto,
          such Options shall be deemed to have been issued for such
          consideration as determined in good faith by the Board of Directors of
          the Company.

               (f)(5) Record Date. In case the Company shall take a record of
          the holders of its Common Stock for the purpose of entitling them (i)
          to receive a dividend or other distribution payable in Common Stock,
          Options or Convertible Securities or (ii) to subscribe for or purchase
          Common Stock, Options or Convertible Securities, then such record date
          shall be deemed to be the date of the issue or sale of the shares of
          Common Stock deemed to have been issued or sold upon the declaration
          of such dividend or the making of such other distribution or the date
          of the granting of such right of subscription or purchase, as the case
          may be.

               (f)(6) Treasury Shares. The number of shares of Common Stock
          outstanding at any given time shall not include shares owned or held
          by or for the account of the Company or any of its wholly-owned
          subsidiaries, and the disposition of any such shares (other than the
          cancellation or retirement thereof) shall be considered an issue or
          sale of Common Stock for the purpose of this subsection (f).

          (g) Anything herein to the contrary notwithstanding, the Company shall
not be required to make any adjustment of the Warrant Price in the case of the
issuance of (A) capital stock, Options or Convertible Securities issued to
directors, officers, employees or consultants of the Company in connection with
their service as directors of the Company, their employment by the Company or
their retention as consultants by the Company pursuant to an equity compensation
program approved by the Board of Directors or the shareholders of the Company,
(B) shares of Common Stock upon the conversion or exercise of Options or
Convertible Securities issued prior to the date hereof, (C) shares of Common
Stock and Convertible Securities issued to investors pursuant to the terms of
the certain purchase or exchange agreements, each dated February 12, 2002, and
shares of Common Stock issuable upon the

                                      -8-
<PAGE>

exercise or conversion of such Convertible Securities in accordance with their
terms, (D) Convertible Securities issued to Roth Capital in payment of the
placement agency fees as disclosed in the purchase agreements; and shares of
Common Stock issuable upon the exercise or conversion of such Convertible
Securities in accordance with their terms, and (E) shares of Common Stock issued
or issuable by reason of a dividend, stock split or other distribution on the
Common Stock (but only to the extent that such a dividend, split or distribution
results in an adjustment in the Warrant Price pursuant to the other provisions
of this Warrant) (collectively, "Excluded Issuances").

     Section 9. Fractional Interest. The Company shall not be required to issue
                -------------------
fractions of Warrant Shares upon the exercise of the Warrant. If any fractional
share of Common Stock would, except for the provisions of the first sentence of
this Section 9, be delivered upon such exercise, the Company, in lieu of
delivering such fractional share, shall pay to the exercising holder of this
Warrant an amount in cash equal to the Fair Market Value of such fractional
share of Common Stock on the date of exercise. As used in this Warrant, "Fair
Market Value" of a share of Common Stock as of a particular date (the "Valuation
Date") shall mean the following: (a) if the Common Stock is then listed on a
national stock exchange, the closing sale price of one share of Common Stock on
such exchange on the last trading day prior to the Valuation Date; (b) if the
Common Stock is then quoted on Nasdaq, the closing sale price of one share of
Common Stock on Nasdaq on the last trading day prior to the Valuation Date or,
if no such closing sale price is available, the average of the high bid and the
low sales price quoted on Nasdaq on the last trading day prior to the Valuation
Date; or (c) if the Common Stock is not then listed on a national stock exchange
or quoted on Nasdaq, the Fair Market Value of one share of Common Stock as of
the Valuation Date, shall be determined in good faith by the Board of Directors
of the Company.

     Section 10. Extension of Expiration Date. If the Company fails to cause any
                 ----------------------------
Registration Statement covering Registrable Securities (unless otherwise defined
herein, capitalized terms are as defined in the Registration Rights Agreement
dated of even date herewith (the "Registration Rights Agreement")) to be
declared effective prior to the applicable dates set forth therein and the
Blackout Period (whether alone, or in combination with any other Blackout
Period) continues for more than 60 days in any 12 month period, or for more than
a total of 90 days, then the Expiration Date of this Warrant shall be extended
one day for each day beyond the 60-day or 90-day limits, as the case may be,
that the Blackout Period continues.

     Section 11. Benefits. Nothing in this Warrant shall be construed to give
                 --------
any person, firm or corporation (other than the Company and the Warrantholder)
any legal or equitable right, remedy or claim, it being agreed that this Warrant
shall be for the sole and exclusive benefit of the Company and the
Warrantholder.

     Section 12. Notices to Warrantholder. Upon the happening of any event
                 ------------------------
requiring an adjustment of the Warrant Price, the Company shall promptly give
written notice thereof to the Warrantholder at the address appearing in the
records of the Company, stating the adjusted Warrant Price and the adjusted
number of Warrant Shares resulting from such event and setting forth in
reasonable detail the method of calculation and the facts upon which such
calculation is

                                      -9-
<PAGE>

based. Failure to give such notice to the Warrantholder or any defect therein
shall not affect the legality or validity of the subject adjustment.

     Section 13. Identity of Transfer Agent. The Transfer Agent for the Common
                 --------------------------
Stock is U.S. Stock Transfer Co. Upon the appointment of any subsequent transfer
agent for the Common Stock or other shares of the Company's capital stock
issuable upon the exercise of the rights of purchase represented by the Warrant,
the Company will mail to the Warrantholder a statement setting forth the name
and address of such transfer agent.

     Section 14. Notices. Unless otherwise provided, any notice required or
                 -------
permitted under this Warrant shall be given in writing and shall be deemed
effectively given as hereinafter described (i) if given by personal delivery,
then such notice shall be deemed given upon such delivery, (ii) if given by
telex or telecopier, then such notice shall be deemed given upon receipt of
confirmation of complete transmittal, (iii) if given by mail, then such notice
shall be deemed given upon the earlier of (A) receipt of such notice by the
recipient or (B) three days after such notice is deposited in first class mail,
postage prepaid, and (iv) if given by an internationally recognized overnight
air courier, then such notice shall be deemed given one day after delivery to
such carrier. All notices shall be addressed as follows: (i) if to the
Warrantholder, at its address as set forth in the Company's books and records
and, if to the Company, at the address as follows, or at such other address as
the Warrantholder or the Company may designate by ten days' advance written
notice to the other:

                    If to the Company:

                         Amerigon Incorporated
                         5462 Irwindale Avenue
                         Irwindale, California 91706
                         Attention:  Chief Executive Officer
                         Fax:  626.815.7441

                    With a copy to:

                         O'Melveny & Myers LLP
                         400 South Hope Street
                         Los Angeles, California  90071
                         Attention:  John A. Laco
                         Fax:  213.430.6407

     Section 15. Registration Rights. The initial holder of this Warrant is
                 -------------------
entitled to the benefit of certain registration rights with respect to the
shares of Common Stock issuable upon the exercise of this Warrant as provided in
the Registration Rights Agreement, and any subsequent holder hereof may be
entitled to such rights.

                                      -10-
<PAGE>

     Section 16. Successors. All the covenants and provisions hereof by or for
                 ----------
the benefit of the Warrantholder shall bind and inure to the benefit of its
respective successors and assigns hereunder.

     Section 17. Governing Law. This Warrant shall be governed by, and construed
                 -------------
in accordance with, the internal laws of the State of New York, without
reference to the choice of law provisions thereof. The Company and, by accepting
this Warrant, the Warrantholder, each irrevocably submits to the exclusive
jurisdiction of the courts of the State of New York located in New York County
and the United States District Court for the Southern District of New York for
the purpose of any suit, action, proceeding or judgment relating to or arising
out of this Warrant and the transactions contemplated hereby. Service of process
in connection with any such suit, action or proceeding may be served on each
party hereto anywhere in the world by the same methods as are specified for the
giving of notices under this Warrant. The Company and, by accepting this
Warrant, the Warrantholder, each irrevocably consents to the jurisdiction of any
such court in any such suit, action or proceeding and to the laying of venue in
such court. The Company and, by accepting this Warrant, the Warrantholder, each
irrevocably waives any objection to the laying of venue of any such suit, action
or proceeding brought in such courts and irrevocably waives any claim that any
such suit, action or proceeding brought in any such court has been brought in an
inconvenient forum.

     Section 18. Call Provision. Notwithstanding any other provision contained
                 --------------
herein to the contrary, in the event that the closing bid price of a share of
Common Stock as traded on the Nasdaq (or such other exchange or stock market on
which the Common Stock may then be listed or quoted) exceeds $4.00
(appropriately adjusted for any stock split, reverse stock split, stock dividend
or other reclassification or combination of the Common Stock occurring after the
date hereof) for twenty (20) consecutive trading sessions and all of the shares
of Common Stock issuable hereunder either (i) are registered pursuant to an
effective Registration Statement (as defined in the Registration Rights
Agreement) which is available for sales of such shares of Common Stock or (ii)
no longer constitute Registrable Securities (as defined in the Registration
Rights Agreement), the Company, upon thirty (30) days prior written notice (the
"Notice Period") following such twenty (20) day period, to the Warrantholder,
may call this Warrant, in whole but not in part, at a redemption price equal to
$0.01 per share of Common Stock then purchasable pursuant to this Warrant.
Notwithstanding any such notice by the Company, the Warrantholder shall have the
right to exercise this Warrant prior to the end of the Notice Period.

     Section 19. No Rights as Stockholder. Prior to the exercise of this
                 ------------------------
Warrant, the Warrantholder shall not have or exercise any rights as a
stockholder of the Company by virtue of its ownership of this Warrant.

     Section 20. Amendment; Waiver. Any term of this Warrant may be amended or
                 -----------------
waived (including the adjustment provisions included in Section 8 of this
Warrant) upon the written consent of the Company and the Warrantholder.

                                      -11-
<PAGE>

     Section 21. Section Headings. The section heading in this Warrant are for
                 ----------------
the convenience of the Company and the Warrantholder and in no way alter,
modify, amend, limit or restrict the provisions hereof.

                                      -12-
<PAGE>

     IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed, as of the 25th day of February, 2002.

                                             AMERIGON INCORPORATED

                                             By:
                                                --------------------------------
                                             Name:
                                             Title:

                                      -13-
<PAGE>

                                   APPENDIX A
                              AMERIGON INCORPORATED
                              WARRANT EXERCISE FORM

To: Amerigon Incorporated

     The undersigned hereby irrevocably elects to exercise the right of purchase
represented by the within Warrant ("Warrant") for, and to purchase thereunder by
the payment of the Warrant Price and surrender of the Warrant,
                                                               -----------------
shares of Common Stock ("Warrant Shares") provided for therein, and requests
that certificates for the Warrant Shares be issued as follows:

                           -------------------------------
                           Name

                           --------------------------------
                           Address

                           --------------------------------

                           --------------------------------
                           Federal Tax ID or Social Security No.

         and delivered by   (euro) certified mail to the above address, or
                            (euro) electronically (provide DWAC
 Instructions:                   ), or
              -------------------
                            (euro) other (specify:
                                           ).
 ------------------------------------------

and, if the number of Warrant Shares shall not be all the Warrant Shares
purchasable upon exercise of the Warrant, that a new Warrant for the balance of
the Warrant Shares purchasable upon exercise of this Warrant be registered in
the name of the undersigned Warrantholder or the undersigned's Assignee as below
indicated and delivered to the address stated below.

Dated:                    ,
       -------------------  ----

Note:  The signature must correspond with

         Signature:
                   ------------------------------
the name of the registered holder as written
on the first page of the Warrant in every
particular, without alteration or enlargement     ------------------------------
or any change whatever, unless the Warrant        Name (please print)
has been assigned.
                                                  ------------------------------

                                                  ------------------------------
                                                  Address

                                                  ------------------------------
                                                  Federal Identification or
                                                  Social Security No.
<PAGE>

                                                  Assignee:

                                                  ------------------------------

                                                  ------------------------------

                                                  ------------------------------

                                       15

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