Document:

<PAGE>

                                 Exhibit 10.7
                                 ------------

                     MEMBERSHIP INTEREST PLEDGE AGREEMENT

     THIS MEMBERSHIP INTEREST PLEDGE AGREEMENT (this "Agreement"), dated as of
September 20, 2001, is made between Amerigon Incorporated, a California
corporation ("Borrower"), and Big Beaver Investments LLC, a Delaware limited
liability company ("Lender").

     WHEREAS, Borrower is a member of BSST LLC, a Delaware limited liability
("BSST"), pursuant to the terms of that certain Amended and Restated Operating
Agreement of BSST LLC, dated as of May 30, 2001 (the "LLC Agreement");

     WHEREAS, Borrower is the holder of two thousand (2,000) units of Series A
Preferred Units (as defined in the LLC Agreement) of BSST, which constitute one
hundred percent (100%) of the Series A Preferred Units of BSST;

     WHEREAS, Borrower and Lender are parties to that certain Credit Agreement
dated as of September 20, 2001 (as amended, modified, renewed or extended from
time to time, the "Credit Agreement"), which Credit Agreement provides, among
other things, for Borrower's borrowing of certain funds from Lender;

     WHEREAS, Borrower and Lender are parties to that certain Security Agreement
dated as of September 20, 2001 (as amended, modified, renewed or extended from
time to time, the "Security Agreement"), which Security Agreement provides,
among other things, for the grant by Borrower to Lender of a security interest
in all of Borrower's property and assets, including, without limitation, the LLC
Collateral (as defined below); and

     WHEREAS, it is a condition precedent to the borrowings under the Credit
Agreement that Borrower enter into this Agreement and grant to Lender the
security interests hereinafter provided to secure the obligations of the
Borrower under the Credit Agreement.

     NOW, THEREFORE, the parties hereto agree as follows:

     SECTION 1. RECITALS.  The above premises are true and correct and are
incorporated herein by reference.

     SECTION 2. DEFINITIONS; INTERPRETATION.

          (a)  All capitalized terms used in this Agreement and not otherwise
defined herein shall have the meanings assigned to them in the Credit Agreement.

          (b)  In this Agreement, (i) the meaning of defined terms shall be
equally applicable to both the singular and plural forms of the terms defined,
and (ii) the captions and headings are for convenience of reference only and
shall not affect the construction of this Agreement.
<PAGE>

     SECTION 3. PLEDGE AND GRANT OF SECURITY INTEREST.

          (a)  As additional security for the payment and performance of the
Obligations by Borrower to Lender, Borrower hereby pledges, assigns, transfers
and conveys and grants a continuing security interest in favor of Lender, for
security purposes, in all of Borrower's right, title and interest in and to,
whether now existing or hereafter from time to time acquired, as a member of
BSST (collectively, the "LLC Collateral"), including, without limitation, (i)
Borrower's Membership Interest (as defined in the LLC Agreement), (ii) two
thousand (2,000) units of Series A Preferred Units (as defined in the LLC
Agreement) (the "Pledged Units"), (iii) all dividends, distributions,
instruments and other property of any kind from time to time received,
receivable or otherwise distributed in respect of or in exchange therefor, and
(iv) all proceeds of any of the foregoing.

          (b)  This Agreement shall create a continuing security interest in the
LLC Collateral, which shall remain in effect until terminated in accordance with
the terms and conditions of this Agreement.

     SECTION 4. VOTING RIGHTS AND DISTRIBUTIONS

          (a)  So long as no Event of Default shall have occurred and be
continuing, Borrower shall be entitled to exercise all voting and other
consensual rights, if any, for any purpose not inconsistent with the terms of
this Agreement or any other Loan Documents.

          (b)  So long as no Event of Default shall have occurred and be
continuing, any and all Distributions (as defined in the LLC Agreement) and
other proceeds pertaining to the LLC Collateral shall be delivered to Lender to
be held in pledge hereunder and shall become part of the LLC Collateral.

          (c)  Upon the occurrence and during the continuance of any Event of
Default, (i) all rights of Borrower to exercise the voting and other consensual
rights, if any, which Borrower would otherwise be authorized to exercise
pursuant to Section 4(a) shall cease, and all such rights shall thereupon become
vested in Lender who then shall have the sole right to exercise any such voting
and other consensual rights, and (ii) Lender shall have the right to apply all
Distributions and any cash so received to the Obligations. Effective upon the
occurrence and during the continuance of an Event of Default, Borrower hereby
grants to Lender an irrevocable proxy coupled with an interest for the LLC
Collateral, pursuant to which proxy Lender shall be entitled to vote or consent
with respect to the LLC Collateral in its sole discretion, as applicable.

          (d)  If during the term of this Agreement any non-cash Distribution,
reclassification, readjustment or other change is declared or made with respect
to any of the LLC Collateral, or if warrants or any other rights or options are
issued in connection with any of the LLC Collateral, or if additional units or
other securities are issued in connection with any of the LLC Collateral
(whether or not for valuable consideration), all such new, substituted and/or
additional units or other securities shall be pledged immediately to Lender to
be held under the terms of this Agreement in the same manner as the LLC
Collateral are held hereunder, and shall become part of the LLC Collateral.

                                       2
<PAGE>

     SECTION 5. FURTHER ASSURANCES; APPOINTMENT OF LENDER AS ATTORNEY-IN-FACT.

          (a)  With respect to the LLC Collateral, Borrower shall, if requested
by Lender, cause BSST to duly authorize and execute, and deliver to Lender an
agreement for the benefit of Lender pursuant to which, following the occurrence
of and during the continuance of an Event of Default, BSST agrees to comply with
any and all instructions regarding BSST originated by Lender without further
consent by Borrower (or other registered owner) and not to comply with
instructions regarding the LLC Collateral originated by any other Person other
than a court of competent jurisdiction.

          (b)  All certificates (if and when available) and instruments
representing or evidencing any of the LLC Collateral shall be delivered to
Lender in suitable form for transfer by delivery or shall be accompanied by duly
executed instruments of transfer or assignment in blank, all in form and
substance satisfactory to Lender.

          (c)  Immediately and without further notice, upon the occurrence of
and during the continuance of any Event of Default, Lender, at any time and at
its sole discretion, may have any or all of the LLC Collateral registered in
Lender's name or that of its nominee or nominees.

          (d)  Borrower at its expense shall execute and deliver, or cause to be
executed and delivered, to Lender any and all documents and instruments, in form
and substance satisfactory to Lender, and take any and all action, which Lender
may reasonably request from time to time, to perfect and continue perfected,
maintain the priority of or provide notice of Lender's security interest in the
LLC Collateral and to accomplish the purposes of this Agreement.  Lender shall
have the right to, in the name of Borrower, or in the name of Lender or
otherwise, without notice to or assent by Borrower, and Borrower hereby
irrevocably constitutes and appoints Lender (and any of Lender's officers or
employees or agents designated by Lender) as Borrower's true and lawful
attorney-in-fact with full power and authority, (i) to sign the name of Borrower
on all or any of such documents or instruments and perform all other acts that
Lender deems necessary or advisable in order to perfect or continue perfected,
maintain the priority or enforceability of or provide notice of Lender's
security interest in, the LLC Collateral, and (ii) to execute any and all other
documents and instruments, and to perform any and all acts and things for and on
behalf of Borrower, which Lender may deem necessary or advisable to maintain,
preserve and protect the LLC Collateral and to accomplish the purposes of this
Agreement, including, without limitation, (A) to defend, settle, adjust or
(after the occurrence and during the continuance of any Event of Default)
institute any action, suit or proceeding with respect to the LLC Collateral, and
(B) after the occurrence and during the continuance of any Event of Default, to
assign any and all of the LLC Collateral to any Person, including itself,
without Borrower's written consent.  The power of attorney set forth in this
Section 4(d), being coupled with an interest, is irrevocable, so long as this
Agreement shall not have terminated in accordance with Section 20.

                                       3
<PAGE>

          (e)  The foregoing shall in no way limit Lender's rights and remedies
upon or after the occurrence and during the continuance of an Event of Default.

     SECTION 6. LENDER'S DUTIES. Notwithstanding any provision contained in this
Agreement, Lender shall have no duty to exercise any of the rights, privileges
or powers afforded to it and shall not be responsible to Borrower or any other
Person for any failure to do so or delay in doing so. Except for the accounting
for moneys actually received by Lender hereunder or in connection herewith,
Lender shall have no duty or liability to exercise or preserve any rights,
privileges or powers pertaining to the LLC Collateral.

     SECTION 7. REPRESENTATIONS AND WARRANTIES.  Borrower represents and
warrants to Lender that:

          (a)  The Pledged Units are uncertificated, are duly authorized and
fully paid, and constitute all of the issued and outstanding units of the Series
A Preferred Units of BSST;

          (b)  Borrower is the legal, record and beneficial owner of the Pledged
Units and has good and marketable title thereto, free and clear of any lien,
hypothecation, security interest, option or other charge or encumbrance, except
for the security interest created by this Agreement, and has full right to
pledge, assign, transfer and deliver the Pledged Units;

          (c)  Borrower has full legal capacity, right, power and authority,
without the consent of any other Person, to execute and deliver this Agreement,
to pledge the LLC Collateral, and to carry out the transactions contemplated
hereby;

          (d)  This Agreement constitutes the legal, valid and binding
obligation of Borrower, enforceable in accordance with its terms; and

          (e)  With respect to the LLC Collateral and for the purposes of
granting and perfecting the security interest provided herein, Borrower is not
subject to laws of a jurisdiction other than the State of California.

     SECTION 8. COVENANTS.

          (a)  Borrower will appear in and defend any action, suit or proceeding
which may affect to a material extent its right, title or interest in the LLC
Collateral.

          (b)  Borrower will not sell, convey, transfer, or otherwise dispose of
any LLC Collateral or any interest therein or create, incur or permit to exist
any pledge, mortgage, lien, charge, security interest or other encumbrance with
respect to the LLC Collateral or the proceeds thereof, other than that created
hereby.

          (c)  Borrower will deliver promptly to Lender any property received in
exchange for or as a distribution on or with respect to the LLC Collateral (with
any necessary endorsement), other than cash distributions.

                                       4
<PAGE>

          (d)  Borrower will promptly execute and deliver all further
instruments and documents, and take all further action that may be necessary or
desirable, or that Lender may request, in order to perfect and protect any
security interest intended to be granted hereby or to enable Lender to exercise
and enforce his rights and remedies hereunder with respect to any LLC
Collateral.

     SECTION 9.  LENDER'S RIGHTS AND REMEDIES.

          (a)  Lender shall have all rights and remedies available to it under
this Agreement, the Security Agreement, the other Loan Documents and applicable
law with respect to the security interests in any of the LLC Collateral or any
other collateral. Borrower agrees that such rights and remedies include, but are
not limited to, the right of Lender as a secured party to sell or otherwise
dispose of Borrower's collateral after any Event of Default pursuant to the UCC
(as such term is defined in the Security Agreement).

          (b)  The cash proceeds actually received from the sale or other
disposition or collection of LLC Collateral, and any other amounts received in
respect of the LLC Collateral the application of which is not otherwise provided
for herein, shall be applied as provided in the Security Agreement.

          (c)  Each right, power and remedy of Lender provided for in this
Agreement, other Loan Documents, or any related agreement now or hereafter
existing at law or in equity or by statute or otherwise shall be cumulative and
concurrent and shall be in addition to every other such right, power or remedy.

     SECTION 10. PRIVATE SALE.   In view of the fact that federal and state
securities laws may impose certain restrictions upon the method by which a sale
of Pledged Units may be effected, it is agreed that upon and after an Event of
Default, Lender may from time to time attempt to sell all or any part of the LLC
Collateral by means of a private sale, restricting the bidders and prospective
purchasers to those who will represent and agree that they are purchasing for
investment only and not for distribution.  Borrower acknowledges that such
private sales may be at prices and on terms less favorable to the seller than if
the LLC Collateral were sold at a public sale and that the Lender has no
obligation to delay the sale of any LLC Collateral to permit the registration of
the LLC Collateral for public sale under any securities law.

     SECTION 11. NOTICES. All notices or other communications hereunder shall be
given in the manner and to the addresses specified in the Credit Agreement. All
such notices and other communications shall be effective (i) if delivered by
hand, when delivered; (ii) if sent by mail, upon the earlier of the date of
receipt or five Business Days after deposit in the mail, first class (or air
mail, with respect to communications to be sent to or from the United States);
and (iii) if sent by facsimile transmission, when sent.

     SECTION 12. NO WAIVER; CUMULATIVE REMEDIES. No failure on the part of
Lender to exercise, and no delay in exercising, any right, remedy, power or
privilege hereunder shall operate as a waiver thereof, nor shall any single or
partial exercise of any such right, remedy, power or privilege preclude any
other or further exercise thereof or the exercise of any

                                       5
<PAGE>

other right, remedy, power or privilege. The rights and remedies under this
Agreement are cumulative and not exclusive of any rights, remedies, powers and
privileges that may otherwise be available to Lender.

     SECTION 13. COSTS AND EXPENSES; INDEMNITY.

          (a)  Borrower agrees to pay on demand all costs and expenses of
Lender, including without limitation all reasonable attorneys' fees, in
connection with the enforcement or attempted enforcement of, and preservation of
any rights or interests under, this Agreement, and the assignment, sale or other
disposal of any of the LLC Collateral.

          (b)  Borrower hereby agrees to indemnify Lender and any of its
affiliates, and their respective directors, officers, employees, agents, counsel
and other advisors (each an "Indemnified Person") against, and hold each of them
harmless from, any and all liabilities, obligations, losses, claims, damages,
demands, penalties, actions, judgments, suits, costs, expenses or disbursements
of any kind or nature whatsoever, including, without limitation, reasonable
attorneys' fees and attorneys' fees incurred pursuant to Chapter 11 United
States Code, which may be imposed on, incurred by, or asserted against any
Indemnified Person, in any way relating to or arising out of this Agreement,
including in connection with any infringement or alleged infringement with
respect to any LLC Collateral, or any action taken or omitted to be taken by it
hereunder (the "Indemnified Liabilities"); provided that Borrower shall not be
liable to any Indemnified Person for any portion of such Indemnified Liabilities
to the extent they are found by a final decision of a court of competent
jurisdiction to have resulted from such Indemnified Person's gross negligence or
willful misconduct. If and to the extent that the foregoing indemnification is
for any reason held unenforceable, Borrower agrees to make the maximum
contribution to the payment and satisfaction of each of the Indemnified
Liabilities which is permissible under applicable law.

          (c)  Any amounts payable to Lender under this Section 13 or otherwise
under this Agreement if not paid upon demand shall bear interest from the date
of such demand until paid in full, at the rate of interest set forth in the
Note.

     SECTION 14. BINDING EFFECT; ASSIGNMENT.  This Agreement shall be binding
upon, inure to the benefit of and be enforceable by Borrower, Lender and their
respective permitted successors and permitted assigns.  Borrower shall not have
the right to assign its rights or obligations or any interest herein without the
prior written consent of Lender.  Lender reserves the right freely to sell,
assign, transfer or grant participations in all or any portion of Lender's
rights and obligations hereunder (i) to one or more Affiliates of Lender and/or
(ii) with the prior consent of Borrower (which consent shall not be unreasonably
withheld) to any other Person.

     SECTION 15. GOVERNING LAW.  This Agreement shall be governed by, and
construed in accordance with, the law of the State of California, except as
required by mandatory provisions of law and to the extent the validity or
perfection of the security interests hereunder, or the remedies hereunder, in
respect of any LLC Collateral are governed by the law of a jurisdiction other
than California.

                                       6
<PAGE>

     SECTION 16. AMENDMENT.  This Agreement and the other Loan Documents contain
the entire agreement of the parties with respect to the subject matter hereof
and shall not be amended except by the written agreement of the parties as
provided in the Credit Agreement.

     SECTION 17. SEVERABILITY.  Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
all applicable laws and regulations.  If, however, any provision of this
Agreement shall be prohibited by or invalid under any such law or regulation in
any jurisdiction, it shall, as to such jurisdiction, be deemed modified to
conform to the minimum requirements of such law or regulation, or, if for any
reason it is not deemed so modified, it shall be ineffective and invalid only to
the extent of such prohibition or invalidity without affecting the remaining
provisions of this Agreement, or the validity or effectiveness of such provision
in any other jurisdiction.

     SECTION 18. COUNTERPARTS.  This Agreement may be executed in any number of
counterparts and by different parties hereto in separate counterparts, each of
which when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

     SECTION 19. INCORPORATION OF PROVISIONS OF THE CREDIT AGREEMENT.  To the
extent the Credit Agreement contains provisions of general applicability to the
Loan Documents, such provisions are incorporated herein by this reference.

     SECTION 20. TERMINATION.  Upon payment and performance in full of all
Obligations, this Agreement shall terminate and Lender shall promptly execute
and deliver to Borrower such documents and instruments reasonably requested by
Borrower as shall be necessary to evidence termination of all security interests
given by Borrower to Lender hereunder; provided, however, that (i)the
obligations of Borrower under Section 13 hereof shall survive such termination
and (ii) in the event a voluntary proceeding in bankruptcy is filed by Borrower
or an involuntary proceeding in bankruptcy is filed against Borrower, this
Agreement and Lender's interest in the LLC Collateral created hereby shall
survive such proceeding.

     SECTION 21. SECURITY AGREEMENT.  Borrower acknowledges that the rights and
remedies of Lender with respect to the security interests in the LLC Collateral
granted hereby may be more fully set forth in the Security Agreement and the
other Loan Documents, and all such rights and remedies are cumulative.

     SECTION 22. NO INCONSISTENT REQUIREMENTS.  Borrower acknowledges that this
Agreement and the Security Agreement may contain covenants and other terms and
provisions variously stated regarding the same or similar matters, and Borrower
agrees that all such covenants, terms and provisions are cumulative and all
shall be performed and satisfied in accordance with their respective terms.

        [Remainder of page left intentionally blank; signatures follow]

                                       7
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have duly executed this Membership
Interest Pledge Agreement, as of the date first above written.

                                           BORROWER:

                                           AMERIGON INCORPORATED, a California
                                           corporation

                                           By: /s/ Richard A. Weisbart
                                               --------------------------------
                                               Richard A. Weisbart,
                                               President and CEO

                                           LENDER:
                                           BIG BEAVER INVESTMENTS LLC, a
                                           Delaware limited liability company

                                           By: /s/ O. B. Marx, III
                                               --------------------------------
                                               Name:  Oscar B. Marx, III
                                                    ---------------------------
                                               Title: President
                                                      -------------------------

AGREED AND ACCEPTED:

BSST LLC, a Delaware limited liability
company

By: /s/ Lon E. Bell
    ----------------------------------
    Name:  Dr. Lon E. Bell
          ----------------------------
    Title: President
           ---------------------------<PAGE>

                                                                    Exhibit 10.8
                                                                    ------------

                                THIRD AMENDMENT
                              TO OPTION AGREEMENT

          THIS THIRD AMENDMENT TO OPTION AGREEMENT (this "Amendment") is dated
as of September 20, 2001 and entered into by and among Amerigon Incorporated, a
California corporation (the "Holder"), BSST, LLC, a Delaware limited liability
company (the "Company"), and Dr. Lon E. Bell ("Dr. Bell") and is made with
reference to that certain Option Agreement, dated as of September 4, 2000 (as
previously amended through the date hereof, the "Option Agreement"), by and
among the Holder, the Company and Dr. Bell.  Capitalized terms used herein
without definition shall have the same meanings herein as set forth in the
Option Agreement.

                                   RECITALS

          WHEREAS, the Holder will be obtaining a bridge loan from Big Beaver
Investments LLC and, as a condition to such bridge loan, is required to make
certain changes to its payment obligations to BSST, LLC under Section 5(b) of
the Option Agreement;

          WHEREAS, the Holder, the Company and Dr. Bell desire to amend the
Option Agreement to permit, among other changes, the Holder to make monthly
payments of $133,333.33 rather than quarterly payments of $400,000 through
December 31, 2001;

          NOW, THEREFORE, in consideration of the premises and the agreements,
provisions and covenants herein contained, the parties hereto agree as follows:

Section 1. AMENDMENT TO THE OPTION AGREEMENT

          Paragraph (b) of Section 5 of the Option Agreement is hereby amended
by deleting it in its entirety and substituting the following therefor:

          "(b)  (i) The Company may request, upon five business days' prior
     notice, the Holder to pay to the Company any remaining uncontributed
     portion of the Commitment Amount in immediately available funds by wire
     transfer to an account designated by the Company in an amount not to exceed
     $133,333.33 in any calendar month; provided, that (1) the Company shall not
     request any amount in excess of such amount required to pay actual cash
     expenses and (2) to the extent that the Company does not request the full
     amount permitted in any given month, any amount remaining may be requested
     by the Company in a future month (but subject to the restriction imposed by
     clause (1) until December 31, 2001).

          (ii) After the Company has received all amounts payable pursuant to
     Section 5(b)(i) (but no earlier than January 1, 2002), the Company may
     ---------------
     request, upon five days' prior notice, the Holder to pay to the Company any
     remaining uncontributed portion of the Commitment Amount in immediately
     available funds by wire transfer to an account designated by the Company in
     an amount not to exceed $266,666.67.
<PAGE>

          (iii) No earlier than two months after the initial payment to the
     Company pursuant to Section 5(b)(ii), the Company may request, upon five
                         ----------------
     days' prior notice, the Holder to pay to the Company any remaining
     uncontributed portion of the Commitment Amount in immediately available
     funds by wire transfer to an account designated by the Company in an amount
     up to the aggregate remaining uncontributed Commitment Amount.

          (iv)  Unless waived in writing by the Company, if the Holder does not
     pay such amount within five business days after a request, the Holder shall
     (i) be liable for all expenses incurred by the Company up to the date such
     payment would otherwise have been due (including, without limitation,
     bonuses, recruitment fees, and moving expenses for prospective employees)
     and (ii) forfeit all rights in, and the Company shall cancel, a number of
     Option Units equal to the unpaid portion of the requested amount divided by
     $1,000; provided, that to the extent the Holder actually pays any expenses
     of the Company as required under clause (i), such amount paid by the Holder
     shall be deemed to have been paid to the Company and all rights in a number
     of Option Units equal to such amount paid divided by $1,000 shall be
     restored and reissued to the Holder."

Section 2. REPRESENTATIONS AND WARRANTIES

          In order to induce the parties to enter into this Amendment, each
party hereby represents and warrants to each other party that:

          (a)   such party has all requisite power and authority to enter into
     this Amendment and to carry out the transactions contemplated by, and
     perform its obligations under, the Option Agreement as amended by this
     Amendment (the "Amended Agreement");

          (b)   the execution and delivery of this Amendment and the performance
     of the Amended Agreement have been duly authorized by all necessary action
     on the part of such party;

          (c)   the execution and delivery by each party of this Amendment and
     the performance by each party of the Amended Agreement do not and will not
     (i) violate any provision of any law or any governmental rule or regulation
     applicable to such party, the organizational documents, if any, of such
     party or any order, judgment or decree of any court or other agency of
     government binding on such party, (ii) conflict with, result in a breach of
     or constitute (with due notice or lapse of time or both) a default under
     any contractual obligation of such party, (iii) result in or require the
     creation or imposition of any lien upon any of the properties or assets of
     such party, or (iv) require any approval of stockholders or members, other
     than consents that have been obtained, or any approval or consent of any
     person under any contractual obligation of such party;

          (d)   the execution and delivery by each party of this Amendment and
     the performance by such party of the Amended Agreement do not and will not
     require any registration with, consent or approval of, or notice to, or
     other action to, with or by, any federal, state or other governmental
     authority or regulatory body;

                                       2
<PAGE>

          (e)   this Amendment and the Amended Agreement have been duly
     executed and delivered by such party and are the legally valid and binding
     obligations of such party, enforceable against such party in accordance
     with their respective terms, except as may be limited by bankruptcy,
     insolvency, reorganization, moratorium or similar laws relating to or
     limiting creditors' rights generally or by equitable principles relating to
     enforceability.

          (f)   all representations and warranties of such party contained in
     the Option Agreement are true, correct and complete in all material
     respects on and as of the date hereof except to the extent such
     representations and warranties specifically relate to an earlier date, in
     which case they were true, correct and complete in all material respects on
     and as of such earlier date; and

          (g)   each party has performed all covenants and agreements to be
     performed on their part prior to the date hereof as set forth in the Option
     Agreement.

Section 3. MISCELLANEOUS

          A.    Reference to and Effect on the Option Agreement.

          (i)   Except as specifically amended by this Amendment, the Option
     Agreement shall remain in full force and effect and is hereby ratified and
     confirmed.

          (ii)  The execution, delivery and performance of this Amendment shall
     not, except as expressly provided herein, constitute a waiver of any
     provision of, or operate as a waiver of any right, power or remedy under,
     the Option Agreement.

          B.    Headings.  Section and subsection headings in this Amendment are
included herein for convenience of reference only and shall not constitute a
part of this Amendment for any other purpose or be given any substantive effect.

          C.    Applicable Law. THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF
THE PARTIES HEREUNDER SHALL BE GOVERNED BY, AND SHALL BE CONSTRUED AND ENFORCED
IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF CALIFORNIA, WITHOUT REGARD
TO CONFLICTS OF LAWS PRINCIPLES.

          D.    Effectiveness.   This Amendment shall become effective upon the
execution of counterparts hereof by the Holder, the Company and Dr. Bell and
receipt by the Holder, the Company and Dr. Bell of written or telephonic
notification of such execution and authorization of delivery thereof.

                                       3
<PAGE>

          E.    Counterparts.  This Amendment may be executed in one or more
counterparts and by different parties hereto in separate counterparts, each of
which when so executed and delivered shall be deemed an original, but all such
counterparts together shall constitute but one and the same instrument;
signature pages may be detached from multiple separate counterparts and attached
to a single counterpart so that all signature pages are physically attached to
the same document.

                          [signature page to follow]

                                       4
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed and delivered by their respective officers thereunto duly
authorized as of the date first written above.

                              AMERIGON INCORPORATED

                              By: /s/ Richard A. Weisbart
                                 ---------------------------------
                                  Name:  Richard A. Weisbart
                                  Title: President and Chief Executive Officer

                              BSST, LLC

                              By: /s/ Lon E. Bell
                                 ---------------------------------
                                  Name:  Dr. Lon E. Bell
                                  Title: President

                              DR. LON E. BELL

                                  /s/ Lon E. Bell
                                 ---------------------------------

                                       S-1

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