Exhibit 10.2

EXECUTION VERSION

FIRST AMENDMENT

TO CREDIT AGREEMENT

THIS FIRST AMENDMENT TO CREDIT AGREEMENT, dated as of April 4, 2011 (this “Amendment”) to the Existing Credit Agreement (such capitalized term and other capitalized terms used in this preamble and the recitals below to have the meanings set forth in, or are defined by reference in, Article I below) is entered into by and among AMERIGON INCORPORATED, a Michigan corporation (the “Company”), AMERIGON EUROPE GMBH, a German limited liability company (“Amerigon Germany” and, together with the Company, the “Borrowers” and each, a “Borrower”), each lender party hereto (collectively, the “Lenders” and individually, a “Lender”) and BANK OF AMERICA, N.A., as Administrative Agent, Swing Line Lender and L/C Issuer (in such capacity as administrative agent, the “Administrative Agent”).

W I T N E S S E T H:

WHEREAS, the Borrowers, the Lenders and the Administrative Agent are all parties to the Credit Agreement, dated as of March 30, 2011 (as amended or otherwise modified prior to the date hereof, the “Existing Credit Agreement”, and as amended by this Amendment and as the same may be further amended, supplemented, amended and restated or otherwise modified from time to time, the “Credit Agreement”); and

WHEREAS, the Borrowers have requested that the Lenders amend certain provisions of the Existing Credit Agreement and the Lenders are willing to effect such amendments, on the terms and subject to the conditions hereinafter set forth.

NOW, THEREFORE, the parties hereto hereby covenant and agree as follows:

ARTICLE I

DEFINITIONS

SECTION 1.1. Certain Definitions. The following terms when used in this Amendment shall have the following meanings (such meanings to be equally applicable to the singular and plural forms thereof):

“Amendment” is defined in the preamble.

“Amendment Effective Date” is defined in Article III.

“Amerigon Germany” is defined in the preamble.

“Borrower” is defined in the preamble.

“Company” is defined in the preamble.

“Credit Agreement” is defined in the first recital.

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“Existing Credit Agreement” is defined in the first recital.

“Lender” is defined in the preamble.

SECTION 1.2. Other Definitions. Terms for which meanings are provided in the Credit Agreement are, unless otherwise defined herein or the context otherwise requires, used in this Amendment with such meanings.

ARTICLE II

AMENDMENTS TO CREDIT AGREEMENT

Effective on (and subject to the occurrence of) the Amendment Effective Date, the provisions of the Existing Credit Agreement referred to below are hereby amended in accordance with this Article II. Except as expressly so amended, the Existing Credit Agreement shall continue in full force and effect in accordance with its terms.

SECTION 2.1. Amendment to Article V. Article V of the Existing Credit Agreement is hereby amended by inserting the following new Section 5.26 at the end thereof:

“5.26 Deposit Accounts. Other than the Escrow Accounts and the deposit account set forth on Schedule II to the Security Agreement, Amerigon Germany does not maintain any deposit accounts (as defined in the UCC), securities accounts (as defined in the UCC) or other similar accounts.”

SECTION 2.2. Amendments to Article VII. Article VII of the Existing Credit Agreement is hereby amended as follows:

SECTION 2.2.1. Amendment to Section 7.18. Section 7.18 of the Existing Credit Agreement is hereby amended and restated in its entirety to read as follows:

“7.18 Tender Offer Extensions and Withdrawal. (a) Extend or permit the extension of the Takeover Offer beyond July 1, 2011 or (b) fail to withdraw the Takeover Offer on or prior to July 1, 2011.”

SECTION 2.2.2. Amendment to Article VII. Article VII of the Existing Credit Agreement is hereby amended by inserting the following new Section 7.19 at the end thereof:

“7.19 Bank Accounts. Open, or cause to be opened, any deposit account (as defined in the UCC), securities account (as defined in the UCC) or other similar account unless the Administrative Agent is given thirty (30) days prior written notice and the Administrative Agent is granted a first-priority, perfected Lien in such account for the benefit of the Lenders in accordance with the Security Agreement and, in respect of Amerigon Germany, in respect of any deposit account (as defined in the UCC) opened or to be opened with a financial institution in Germany, the German law governed account pledge agreement dated as of March 30, 2011 among Amerigon Germany, the Lenders party thereto and the Administrative Agent.”

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ARTICLE III

CONDITIONS TO EFFECTIVENESS

This Amendment shall become effective on and as of the date first written above (the “Amendment Effective Date”) following receipt by the Administrative Agent of counterparts hereof executed on behalf of the Borrowers and the Required Lenders.

ARTICLE IV

MISCELLANEOUS

SECTION 4.1. Cross-References. References in this Amendment to any Article or Section are, unless otherwise specified, to such Article or Section of this Amendment.

SECTION 4.2. Loan Document Pursuant to Existing Credit Agreement. This Amendment is a Loan Document executed pursuant to the Existing Credit Agreement and shall (unless otherwise expressly indicated therein) be construed, administered and applied in accordance with all of the terms and provisions of the Existing Credit Agreement, as amended hereby, including Article X thereof.

SECTION 4.3. Successors and Assigns. This Amendment shall be binding upon and inure to the benefit of the parties hereto and their respective successors and assigns.

SECTION 4.4. Counterparts. This Amendment may be executed in counterparts (and by different parties hereto in different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract. This Amendment constitutes the entire contract among the parties relating to the subject matter hereof and supersedes any and all previous agreements and understandings, oral or written, relating to the subject matter hereof. Delivery of an executed counterpart of a signature page of this Amendment by telecopy or other electronic imaging means shall be effective as delivery of a manually executed counterpart of this Amendment.

SECTION 4.5. Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK, INCLUDING FOR SUCH PURPOSES SECTIONS 5-1401 AND 5-1402 OF THE GENERAL OBLIGATIONS LAW OF THE STATE OF NEW YORK.

SECTION 4.6. Full Force and Effect; Limited Amendment and Waiver. Except as expressly amended or waived hereby, all of the representations, warranties, terms, covenants, conditions and other provisions of the Existing Credit Agreement and the other Loan Documents shall remain unchanged and shall continue to be, and shall remain, in full force and effect in accordance with their respective terms. The amendments and waivers set forth herein shall be limited precisely as provided for herein to the provisions expressly amended or waived herein and shall not be deemed to be an amendment to, waiver of,

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consent to or modification of any other term or provision of the Existing Credit Agreement or any other Loan Document or of any transaction or further or future action on the part of any Loan Party which would require the consent of the Lenders under the Existing Credit Agreement or any of the Loan Documents.

SECTION 4.7. Representations and Warranties. In order to induce the Lenders to execute and deliver this Amendment, the Borrower hereby represents and warrants to the Lenders that, both before and after giving effect to this Amendment, all statements set forth in clauses (a) and (b) of Section 4.04 of the Credit Agreement are true and correct.

SECTION 4.8. Acknowledgement of the Lenders. Each of the Lenders acknowledges that it has, independently and without reliance upon the Administrative Agent or any other Lender or any of their Related Parties and based on such documents and information as it has deemed appropriate, made its own credit analysis and decision to enter into this Amendment and its own investigations into the financial condition, creditworthiness, condition, affairs, status and nature of the Loan Parties, all of the matters and transactions contemplated in this Amendment and all other matters incidental thereto, including any amendment releasing the Liens of each Lender form the Senior Loan Escrow Account and hereby confirms that it is not relying and has not relied on any statement or representation of the Administrative Agent or any other Lender or any of their Related Parties, including legal counsel, in connection with its decision to enter into this Amendment and any amendment releasing the Liens of each Lender form the Senior Loan Escrow Account.

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IN WITNESS WHEREOF, the parties hereto have executed and delivered this Amendment as of the date first above written.

First Amendment to Credit Agreement

First Amendment to Credit Agreement

First Amendment to Credit Agreement

First Amendment to Credit Agreement

First Amendment to Credit Agreement

First Amendment to Credit Agreement

First Amendment to Credit Agreement