UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) April 20, 2005

BANK ONE AUTO SECURITIZATION TRUST 2003-1

(Exact name of registrant as specified in its charter)

Delaware

333-107580

Not Available

(State or other jurisdiction of

incorporation or organization)

(Commission File Number)

(IRS Employer

Identification Number)

C/O Wilmington Trust Company

Rodney Square North, 1100 North Market Street, Wilmington, Delaware

19890-1600

(Address of principal executive offices)

(Zip Code)

(302) 282-1039

Registrant’s telephone number, including area code

N/A

(Former name, former address and former fiscal year, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Section 8 - Other Events

Item 8.01 Other Events.

This Current Report on Form 8-K is being filed to file a copy of the Monthly Statement dated April 18, 2005 furnished to JPMorgan Chase Bank, as paying agent, by JP Morgan Chase Bank, NA as servicer on behalf of the Bank One Auto Securitization Trust 2003-1 (the “Trust”), to be distributed to the Noteholders and Certificateholders, pursuant to the Sale and Servicing Agreement dated as of August 29, 2003, among the Trust, Bank One Auto Securitization LLC, the Servicer, and JPMorgan Chase Bank.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits

The following exhibits are filed as a part of this report:


Exhibit		Description
99.1		Monthly Statement to Noteholders and Certificateholders dated April 18, 2005

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.


JPMorgan Chase Bank, NA not in its individual capacity but solely as Servicer on behalf of the Trust

By:		/s/ Philip C. McNiel
Name:		Philip C. McNiel
Title:		Vice President

Date: April 20, 2005

BANK ONE AUTO SECURITIZATION TRUST 2003-1 8-K