Document:

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                                                                    Exhibit 4.5

                           SECOND AMENDED AND RESTATED
                               BRIDGE LOAN WARRANT

THIS SECURITY AND ANY SHARES ISSUED UPON EXERCISE OF THIS SECURITY HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR
APPLICABLE STATE SECURITIES LAWS AND MAY NOT BE TRANSFERRED OR OTHERWISE
DISPOSED OF UNLESS THE APPLICABLE SECURITY HAS BEEN REGISTERED UNDER THE ACT AND
SUCH LAWS OR (1) REGISTRATION UNDER SUCH LAWS IS NOT REQUIRED AND (2) AN OPINION
OF COUNSEL SATISFACTORY TO THE COMPANY IS FURNISHED TO THE COMPANY TO THE EFFECT
THAT REGISTRATION UNDER THE ACT AND THE APPLICABLE STATE SECURITIES LAWS IS NOT
REQUIRED.

                              AMERIGON INCORPORATED

                           SECOND AMENDED AND RESTATED
                        WARRANT TO PURCHASE COMMON STOCK

          This Second Amended and Restated Warrant (this "Warrant") represents
and certifies that, for value received, Big Beaver Investments LLC, a Delaware
limited liability company (the "Holder"), is entitled to subscribe for and
purchase three hundred twenty six thousand eighty seven (326,087) shares
(subject to adjustment from time to time pursuant to the provisions of Section 4
hereof) of fully paid and nonassessable Common Stock of Amerigon Incorporated, a
California corporation (the "Company"), at $1.15 per shares (the "Exercise
Price"). The number of shares purchasable upon exercise of this Warrant and the
Exercise Price shall be subject to adjustment from time to time as described in
Section 4 hereof.

          As used herein, the term "Common Stock" shall mean the Company's
presently authorized Common Stock, no par value, and any securities or other
property into or for which such Common Stock may hereafter be converted or
exchanged.

     1.   TERM OF WARRANT.

          The purchase right represented by this Warrant is exercisable, in
whole or in part, at any time during a period beginning on the effective date of
this Warrant (as set forth in the last paragraph of this Warrant) and ending
five (5) years after such date (the "Warrant Term").

     2.   METHOD OF EXERCISE; PAYMENT; ISSUANCE OF NEW WARRANT.

          a. Subject to Section 1 hereof, the purchase right represented by this
Warrant may be exercised by the Holder, in whole or in part, by the surrender of
this Warrant (with the notice of exercise form attached hereto as Exhibit 1 duly
                                                                  ---------
executed) at the principal office of the Company and by the payment to the
Company, by cashier's check or wire transfer, of an amount equal to the then
applicable Exercise Price per share multiplied by the number of shares then
being purchased. The Company agrees that the shares so purchased shall be deemed
to be issued to the Holder as the record owner of such shares as of the close of
business on the date on

                                       1
<PAGE>

which this Warrant shall have been surrendered and payment made for such shares
as aforesaid. In the event of any exercise of this Warrant, a certificate or
certificates for the shares of stock so purchased shall be delivered to the
Holder within fifteen (15) business days thereafter and, unless this Warrant has
been fully exercised or expired, a new warrant representing the portion of the
shares, if any, with respect to which this Warrant shall not then have been
exercised, shall also be issued to the Holder within such fifteen (15) business
day period.

     3.   STOCK FULLY PAID; RESERVATION OF SHARES.

          All Common Stock which may be issued upon the exercise of the rights
represented by this Warrant will, upon issuance, be fully paid and
nonassessable, and free from all liens, charges and United States taxes with
respect to the issue thereof. During the period within which the rights
represented by this Warrant may be exercised, the Company will at all times have
authorized, and reserved for the purpose of the issuance upon exercise of the
purchase rights evidenced by this Warrant, a sufficient number of shares of its
Common Stock to provide for the exercise of the rights represented by this
Warrant.

     4.   ADJUSTMENT OF PURCHASE PRICE AND NUMBER OF SHARES.

          a. STOCK SPLITS AND COMBINATIONS. If the Company at any time or from
time to time after the date this Warrant is issued effects a subdivision of the
outstanding Common Stock pursuant to a stock split or similar event, the
Exercise Price shall be proportionately decreased, and conversely, if the
Company at any time or from time to time after the date this Warrant is issued
combines the outstanding shares of Common Stock into a smaller number of shares
in a reverse stock split or similar event, the Exercise Price shall be
proportionately increased. Upon the adjustment of the Exercise Price pursuant to
the foregoing provisions, the number of shares of Common Stock subject to the
exercise of the Warrant shall be adjusted to the nearest full share by
multiplying the shares subject to the Warrant by a fraction, the numerator of
which is the Exercise Price immediately prior to such adjustment and the
denominator of which is the Exercise Price immediately after such adjustment.
Any adjustment under this subsection (a) shall be effective at the close of
business on the date the subdivision or combination becomes effective.

          b. CERTAIN DIVIDENDS AND DISTRIBUTIONS. If the Company at any time or
from time to time after the date this Warrant is issued makes or fixes a record
date for the determination of holders of Common Stock entitled to receive a
dividend or other distribution payable in additional shares of Common Stock,
then and in each such event the number of shares of Common Stock subject to this
Warrant shall be increased and the Exercise Price then in effect shall be
decreased as of the date of such issuance or, in the event such record date is
fixed, as of the close of business on such record date, by:

               (i) multiplying the Exercise Price then in effect by a fraction
     (A) the numerator of which is the total number of shares of Common Stock
     issued and outstanding immediately prior to the time of such issuance orthe
     close of business on such record date, and (B) the denominator of which
     shall be the total number of shares of Common Stock issued and outstanding
     immediately prior to the time of such issuance or

                                       2
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     the close of business on such record date plus the number of shares of
     Common Stock issuable in payment of such dividend or distribution; and

               (ii) multiplying the number of shares of Common Stock subject to
     the Warrant by a fraction (A) the numerator of which is the total number of
     shares of Common Stock issued and outstanding immediately prior to the time
     of such issuance or the close of business on such record date plus the
     number of shares of Common Stock issuable in payment of such dividend or
     distribution, and (B) the denominator of which shall be the total number of
     shares of Common Stock issued and outstanding immediately prior to the time
     of such issuance or the close of business on such record date.

          If, however, such record date is fixed and such dividend is not fully
paid or if such distribution is not fully made on the date fixed therefor, the
number of shares of Common Stock subject to the Warrant and the Exercise Price
thereof shall be recomputed accordingly as of the close of business on such
record date and thereafter shall be adjusted pursuant to this subsection (b) as
of the time of actual payment of such dividends or distributions.

          c. OTHER ADJUSTMENTS. In the event the Company at any time or from
time to time after the date this Warrant is issued:

               (i) makes a dividend or other distribution payable in securities
     of the Company other than shares of Common Stock, or

               (ii) changes any Common Stock into the same or a different number
     of shares of any class or classes of stock, whether by recapitalization,
     reclassification or otherwise (other than a subdivision or combination of
     shares or stock dividend or a reorganization, merger, consolidation or sale
     of assets provided for elsewhere in this Section 4), or

               (iii) effects a capital reorganization of the Common Stock (other
     than a recapitalization, subdivision, combination, reclassification or
     exchange of shares provided for elsewhere in this Section 4) or merger or
     consolidation of the Company with or into another corporation or entity, or
     the sale of all or substantially all of the Company's properties and assets
     to any other person,

          then, in each such event, any and all new, substituted or additional
securities to which the Holder is or would be entitled by reason of its
ownership of the shares underlying this Warrant shall be immediately subject to
this Warrant and be included in the shares underlying this Warrant for all
purposes hereunder. After each such event, the Exercise Price per share shall be
proportionately adjusted so that the aggregate Exercise Price upon exercise of
this Warrant shall remain the same as before such event.

     5.   NOTICE OF ADJUSTMENTS.

          Whenever any Exercise Price shall be adjusted pursuant to Section 4
hereof, the Company shall prepare a certificate signed by its chief financial
officer setting forth, in reasonable detail, the event requiring the adjustment,
the amount of the adjustment, the method

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by which such adjustment was calculated, the Exercise Price after giving effect
to such adjustment and the number of shares then purchasable upon exercise of
this Warrant, and shall cause copies of such certificate to be mailed (by first
class mail, postage prepaid) to the Holder of this Warrant at the address
specified in Section 8(c) hereof, or at such other address as may be provided to
the Company in writing by the Holder of this Warrant.

     6.   FRACTIONAL SHARES.

          No fractional shares of Common Stock will be issued in conjunction
with any exercise hereunder, but in lieu of such fractional shares the Company
shall make a cash payment therefore on the basis of the Exercise Price then in
effect.

     7.   COMPLIANCE WITH SECURITIES ACT.

          The Holder of this Warrant, by acceptance hereof, agrees that this
Warrant and the shares of Common Stock to be issued on exercise hereof are being
acquired for investment and that it will not offer, sell or otherwise dispose of
this Warrant or any shares of Common Stock to be issued upon exercise hereof
except under circumstances which will not result in a violation of the
Securities Act of 1933, as amended (the "Act"). This Warrant and all shares of
Common Stock issued upon exercise of this Warrant (unless registered under the
Act) shall be stamped and imprinted with a legend substantially in the following
form:

               "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
     OF 1933, AS AMENDED (THE "ACT"), OR APPLICABLE STATE SECURITIES LAWS AND
     MAY NOT BE TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS IT HAS BEEN
     REGISTERED UNDER THE ACT AND SUCH LAWS OR (1) REGISTRATION UNDER SUCH LAWS
     IS NOT REQUIRED AND (2) AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY
     IS FURNISHED TO THE COMPANY TO THE EFFECT THAT REGISTRATION UNDER THE ACT
     AND THE APPLICABLE STATE SECURITIES LAWS IS NOT REQUIRED."

     8.   MISCELLANEOUS.

          a. NO RIGHTS AS SHAREHOLDER. The Holder of this Warrant shall not be
entitled to vote or receive dividends or be deemed the Holder of Common Stock or
any other securities of the Company that may at any time be issuable on the
exercise hereof for any purpose, nor shall anything contained herein be
construed to confer upon the Holder of this Warrant, as such, any of the rights
of a shareholder of the Company or any right to vote for the election of
directors or upon any matter submitted to shareholders at any meeting thereof,
or to give or withhold consent to any corporate action (whether upon any
recapitalization, issuance of stock, reclassification of stock, change of par
value or change of stock to no par value, consolidation, merger, conveyance or
otherwise) or to receive notice of meetings, or to receive dividends or
subscription rights or otherwise, until the Warrant shall have been exercised
and the shares purchasable upon the exercise hereof shall have become
deliverable, as provided herein.

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          b. REPLACEMENT. On receipt of evidence reasonably satisfactory to the
Company of the loss, theft, destruction, or mutilation of this Warrant and, in
the case of mutilation, on surrender and cancellation of this Warrant, the
Company, at the Holder's expense, will execute and deliver, in lieu of this
Warrant, a new Warrant of like tenor.

          c. NOTICE. Any notice given to either party under this Warrant shall
be in writing, and any notice hereunder shall be deemed to have been given upon
the earlier of delivery thereof by hand delivery, by courier, or by standard
form of telecommunication or three (3) business days after the mailing thereof
in the U.S. mail if sent registered mail with postage prepaid, addressed to the
Company at its principal executive offices and to the Holder at its address set
forth in the Company's books and records or at such other address as the Holder
may have provided to the Company in writing.

          d. GOVERNING LAW. This Warrant shall be governed and construed under
the laws of the State of California.

          e. PRIOR WARRANT SUPERCEDED. Upon due execution of this Warrant by the
Company, receipt of this Warrant by the Holder and, effectiveness of this
Warrant in accordance with the next paragraph of this Warrant, this Warrant
shall supercede and replace the Amended and Restated Bridge Loan Warrant dated
December 1, 2001, which prior warrant shall be terminated.

                            [Signature Page Follows]

                                       5
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          This Second Amended and Restated Bridge Loan Warrant is effective as
of the closing of the sale of shares and warrants to purchase shares of the
Company pursuant to that certain Purchase Agreement dated February 12, 2002 by
and among the Company and Special Situations Fund III, L.P., Special Situation
Funds Cayman Fund, L.P., Special Situations Private Equity Fund, L.P. and
Special Situations Technology Fund, L.P.

                                          AMERIGON INCORPORATED, a California
                                          corporation

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

Agreed and Acknowledged:

Big Beaver Investments, LLC

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

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EXHIBIT 1
---------

                               NOTICE OF EXERCISE
                               ------------------

TO:  AMERIGON INCORPORATED

     1. Check Box that Applies:

          [ ]  The undersigned hereby elects to purchase             shares of
                                                         -----------
               Cmmon Stock of AMERIGON INCORPORATED pursuant to the terms of the
               attached Warrant, and tenders herewith payment of the purchase
               price of such shares in full.

     2. Please issue a certificate or certificates representing said shares of
Common Stock in the name of the undersigned or in such other name as is
specified below:

                  ----------------------------------
                                (Name)

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

                  ----------------------------------
                               (Address)

     3. The undersigned represents that the aforesaid shares of Common Stock are
being acquired for the account of the undersigned for investment and not with a
view to, or for resale in connection with, the distribution thereof and that the
undersigned has no present intention of distributing or reselling such shares.

                                                       -------------------------
                                                       Signature

                                       7<PAGE>

                                                                    Exhibit 4.6

     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 SSF-
             ----

                              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 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
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 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

                                      -2-
<PAGE>

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 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,

                                      -3-
<PAGE>

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 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

                                      -4-
<PAGE>

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 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

                                      -8-
<PAGE>

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.

     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 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 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;
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.

     Section 20. Amendment; Waiver. This Warrant is one of a series of Warrants
                 -----------------
of like tenor issued by the Company 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 1,833,350 shares

                                      -11-
<PAGE>

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 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 25(th) 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      Name (please print)
or any change whatever, unless the Warrant
has been assigned.
                                                   -----------------------------
                                                   -----------------------------
                                                   Address

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

                                                   Assignee:
                                                   -----------------------------
                                                   -----------------------------
                                                   -----------------------------

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