<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                   -----------

                                  FORM 10-K/A
                                AMENDMENT NO. 1


(MARK ONE)

[X]     ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
        EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 1997

                                       OR

[ ]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

For the transition period from ______________ to _________________

                        Commission file number: 333-32935

                        WFS FINANCIAL 1997-C OWNER TRUST
              EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                                                   <C>       
                             CALIFORNIA                                  33-0149603
--------------------------------------------------------------        -------------------
(STATE OR OTHER JURISDICTION OF INCORPORATION OR ORGANIZATION)        (I.R.S. EMPLOYER
                                                                      IDENTIFICATION NO.)
</TABLE>

WFS FINANCIAL AUTO LOANS, INC.
23 PASTEUR ROAD
IRVINE, CALIFORNIA                                                      92618
----------------------------------------                              ----------
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                              (ZIP CODE)

REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (714) 753-3000

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT: NONE.

SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT: NONE.

         Indicate by check mark whether the registrant: (1) has filed all
reports required to be filed by Section 13 or 15(d) of the Securities Exchange
Act of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X]   No [ ]

         Indicate by check mark if disclosure of delinquent filers pursuant to
Item 405 of Regulation S-K is not contained herein, and will not be contained,
to the best of registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. [X]

DOCUMENTS INCORPORATED BY REFERENCE:  None.

                           Exhibit Index is on Page 6.

                                     Page 1 of ___.


<PAGE>   2
ITEM 1. BUSINESS

      Not applicable.

ITEM 2. PROPERTIES

On September 18, 1997 the Commission declared effective a Registration Statement
on Form S-1 (File No. 333-32935) (the "Registration Statement") under the
Securities Act of 1933, as amended (the "Securities Act"), providing for the
issuance by the WFS Financial 1997-C Owner Trust (the "Trust") of the following
securities:

   $126,000,000 of 5.71% Money Market Auto Receivable Backed Notes, Class A-1,
         $130,000,000 of 5.95% Auto Receivable Backed Notes, Class A-2,
         $220,000,000 of 6.10% Auto Receivable Backed Notes, Class A-3,
         $64,000,000 of 6.15% Auto Receivable Backed Notes, Class A-4,
           $60,000,000 of 6.30% Auto Receivable Backed Certificates.

The Class A-1 Notes, Class A-2 Notes, Class A-3 Notes, Class A-4 Notes and Class
A-5 Notes (the "Notes" and together with the Certificates, the "Securities") and
the Certificates were issued by the Trust on September 24, 1997 (the "Closing
Date"). The Notes are secured by the assets of the Trust, while the Certificates
evidence undivided fractional interests in the assets of the Trust. The Notes
and the Certificates were issued in fully-registered form in denominations of
$1,000 and integral multiples thereof. As more fully described in the
Registration Statement, the assets of the Trust will include (i) a pool of
retail installment contracts secured by liens on new and used automobiles and
light trucks ("Contracts"), (ii) a financial guaranty insurance policy issued by
Financial Security Assurance Inc. (the "Insurer"), and (iii) certain accounts
maintained by the Trustee on behalf of the Trust, including all investments held
thereby and all income from the investment of funds therein and all proceeds
therefrom.

Information as to the number of Contracts remaining in the Trust, the aggregate
unpaid principal balance thereof, the decrease therein, delinquencies on the
Contracts, collections of principal and interest made, fees paid to the Servicer
and the amount of the Policies are set forth in the exhibits incorporated herein
in response to Item 14, below.

ITEM 3. LEGAL PROCEEDINGS

The Registrant knows of no material pending legal proceedings with respect to
the Trust involving the Trust, the Trustee, the Seller or the Servicer.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

No matter was submitted to a vote of the holders of the Certificates during the
fiscal year covered by this Report.


                                     Page 2
<PAGE>   3
PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

As of December 31, 1997, there was one holder of record of the Securities. See
also Item 12. Security Ownership of Certain Beneficial Owners and Management.
There was no principal market in which the Securities traded.

ITEM 6. SELECTED FINANCIAL DATA

Omitted.

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

Omitted.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Omitted.

ITEM 9. DISAGREEMENTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

PART III

ITEM 10. DIRECTORS AND OFFICERS OF THE REGISTRANT

Omitted.

ITEM 11. EXECUTIVE COMPENSATION

Omitted.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

The following table reflects certain information regarding holders of record
(i.e., participants in the DTC System for which Certificates are held of record
by Cede & Co.) which beneficially own more than 5% of the Certificates as of
April 1, 1998. The dollar and percentage amounts reflected in the table below
are based upon the face amount of certificates as of the Closing Date, and do
not reflect amortization, if any, since that date. The Registrant does not have
any information as to whether the persons listed below hold such Certificates
for their own account, partially for their own account and partial for the
account of others or solely for the account of others.

<TABLE>
<CAPTION>

Name and Address          Amount of Certificates       Percent of Certificates 
of Participant            Beneficially Owned           Beneficially Owned
----------------          ----------------------       -----------------------
<S>                       <C>                          <C>
Bankers Trust Company           $18,500,000                     30.8%
SSB - Custodian
  and Trust Company             $40,900,000                     68.2%
</TABLE>

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

There have not been any transactions or series of transactions since the start
of the Trust's last fiscal year between the Trust and any Certificateholder
which is identified as the beneficial owner of more than 5% of the Certificates
in Item 12, above, other than the following: Bankers Trust Company acts as the
Indenture Trustee for the Trust pursuant to an Indenture dated as of 
September 1,1997 pursuant to which the Notes were issued. The fees paid to the 
Indenture Trustee are consistent with those paid to unrelated parties acting 
as indenture trustee in similar transactions. The amount of the fees are not 
material to the operations or financial condition of the Trust.

                                     Page 3

<PAGE>   4


ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

(a)   The following documents are filed as part of this Report:

      Exhibit Number        Description
      --------------        -----------

              20.1          Current Report on Form 8-K for the for the December
                            20, 1997 Distribution Date (incorporated herein by
                            reference to the WFS Financial 1997-C Owner Trust
                            Form 8-K filed on January 5, 1998, file number
                            333-32935)*

              20.2          Current Report on Form 8-K for the for the March 20,
                            1998 Distribution Date (incorporated herein by
                            reference to the WFS Financial 1997-C Owner Trust
                            Form 8-K filed on March 25, 1998, file number 333-
                            32935)*

              20.3          Accountants' Report dated February 9, 1998* 

              20.4          Annual Statement of Compliance by Master Servicer
                            dated January 26, 1998*

              20.5          Annual Statement to Securityholders for the Service
                            Period 1997*

              20.6          consolidated financial statements of Financial
                            Security Assurance Inc. and Subsidiaries as of
                            December 31, 1997 and 1996, and for each of the
                            three years in the period ended December 31, 1997
                            (Incorporate by reference from the Annual Report on
                            Form 10-K of Financial Security Assurance Holdings 
                            Ltd. for the year ended December 31, 1997 
                            (file # 1-12644) as filed on or about March 24, 
                            1998)*

              23            Written Consent of Coopers & Lybrand, L.L.P.*

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

* Previously filed.



(b)   Reports on Form 8-K: All reports filed on Form 8-K required to be
      disclosed are identified above in response to Item 14(a).

(c)   Omitted.

(d)   Omitted.

                                     Page 4
<PAGE>   5
                                   SIGNATURES

      Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this Amendment No. 1 to
its Annual Report to be signed on its behalf by the undersigned, thereunto 
duly authorized.

                                   WFS FINANCIAL 1997-C OWNER TRUST

                                   BY: WFS FINANCIAL INC, as Master Servicer


Date: April 14, 1998               By: /S/ LEE A. WHATCOTT
                                   ----------------------------------------
                                       Lee A. Whatcott, Chief Financial Officer


                                     Page 5
<PAGE>   6
                                INDEX TO EXHIBITS


<TABLE>
<CAPTION>
Exhibit No.                                 Description                                                 Page
-----------                                 -----------                                                 ----
<S>                   <C>                                                                               <C> 

    20.1              Current Report on Form 8-K for the for the December 20, 1997
                      Distribution Date (incorporated herein by reference to the WFS
                      Financial 1997-C Owner Trust Form 8-K filed on January 5,
                      1998, file number 333-32935)*

    20.2              Current Report on Form 8-K for the for the March 20, 1998
                      Distribution Date (incorporated herein by reference to the WFS
                      Financial 1997-C Owner Trust Form 8-K filed on March 25,
                      1998, file number 333-32935)*

    20.3              Accountants' Report dated February 9, 1998*

    20.4              Annual Statement of Compliance by Master Servicer dated
                      January 26, 1998*

    20.5              Annual Statement to Securityholders for the Service Period 1997*

    20.6              consolidated financial statements of Financial Security Assurance
                      Inc. and Subsidiaries as of December 31, 1997 and 1996, and
                      for each of the three years in the period ended December 31,
                      1997 (Incorporate by reference from the Annual Report on Form
                      10-K of Financial Security Assurance Holdings Ltd. for the year
                      ended December 31, 1997 (file # 1-12644) as filed on or about
                      March 24, 1998)*

    23                Written Consent of Coopers & Lybrand, L.L.P.*
</TABLE>

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

* Previously filed.


                                     Page 6