Exhibit 99.1

Bank One Auto Securitization Trust 2003-1

Monthly Servicer Certificate

For the Collection Period ended: February 28, 2006

PAGE 1


Distribution Date Summary

			Initial	Begin	End	# days
Distribution Date					3/20/2006
Collection Period				2/1/2006	2/28/2006	28
Monthly Interest Period - Actual				2/21/2006	3/20/2006	27
Monthly Interest - Scheduled						30
Pool Balance			733,163,743.80	220,096,796.04	208,667,703.41	—
Monthly Distribution Summary
	Initial Balance		Beginning Balance	Principal Distribution	Ending Balance	Note Factor
Class A-1 Notes	149,000,000.00		—	—	—	—
Class A-2 Notes	245,000,000.00		—	—	—	—
Class A-3 Notes	151,000,000.00		36,498,815.84	10,143,319.71	26,355,496.13	0.1745397
Class A-4 Notes	160,670,000.00		160,670,000.00	—	160,670,000.00	1.0000000
Class B Notes	18,329,000.00		6,431,795.96	1,285,772.92	5,146,023.04	0.2807585

Total Securities	723,999,000.00		203,600,611.80	11,429,092.63	192,171,519.17	0.2654306


	Coupon Rate		Monthly Accrued Interest	Prior Interest Carryover	Total Interest Paid	Interest Shortfall
	Coupon Rate		Monthly Accrued Interest	Prior Interest Carryover	Total Interest Paid	Interest Shortfall
Class A-1 Notes	1.1000	%	—	—	—	—
Class A-2 Notes	1.2900	%	—	—	—	—
Class A-3 Notes	1.8200	%	55,356.54	—	55,356.54	—
Class A-4 Notes	2.4300	%	325,356.75	—	325,356.75	—
Class B Notes	2.1000	%	11,255.64	—	11,255.64	—

Total Securities			391,968.93	—	391,968.93	—


Available Collections

Principal Payments Received						11,245,406.61
Interest Payments Received						1,123,564.27
Receivables Repurchased during collection period - Principal						—
Receivables Repurchased during collection period - Interest						—
Recoveries on Defaulted Receivables						48,160.64

Total Available Collections						12,417,131.52

Reserve Account Transfer Amount						—

Total Available Funds						12,417,131.52


Summary of Distributions

Payment of Servicing Fee:						183,414.00
Payment of Class A Interest Amount:						380,713.29
First Priority Principal Distribution Amount:						—
Payment of Class B Monthly Interest:						11,255.64
Regular Principal Distribution Amount:						11,429,092.63
Payment to the Reserve Account to Maintain Specified Reserve Balance:						—

Remaining Available Funds (To the Holder(s) of the Certificates)						412,655.96

Release of excess reserve						6,213.53

Total Funds Remitted (To the Holder(s) of the Certificates)						418,869.49

Bank One Auto Securitization Trust 2003-1

Monthly Servicer Certificate

For the Collection Period ended: February 28, 2006

PAGE 2


Calculation of Servicing Fee

Beginning Pool Balance			220,096,796.04
Multiplied By: Monthly Servicing Fee (1.0%/12)			0.08333	%
Monthly Servicing Fee			183,414.00
Plus: Unpaid Servicing Fees from Prior Periods			—

Servicing Fees Due and Paid			183,414.00

Calculation of Class A Interest Amount Due

Class A-1 Note Interest Accrued			—
Class A-2 Note Interest Accrued			—
Class A-3 Note Interest Accrued			55,356.54
Class A-4 Note Interest Accrued			325,356.75
Total Class A Note Interest Accrued During Period			380,713.29
Plus: Interest Shortfalls from Prior Periods			—

Total Class A Note Interest Due			380,713.29

Calculation of Class A Interest Amount Paid

Available Collections After Servicing Fee			12,233,717.52
Available Collection Shortfall			—
Reserve Account Draw			—

Class A Interest Amount Paid			380,713.29

Class A Interest Shortfall Carryforward			—

Calculation of First Priority Principal Distribution Amount Due:

Beginning Class A Note Balance			197,168,815.84
Less: Ending Pool Balance			208,667,703.41

First Priority Principal Distribution Amount			—

Calculation of First Priority Principal Distribution Amount Paid:

Available Collections After Servicing Fee and Class A Interest			11,853,004.24
Available Collections Shortfall			—
Reserve Account Draw			—

First Priority Principal Distribution Amount Paid			—

Calculation of Class B Interest Amount Due

Class B Note Interest Accrued			11,255.64
Plus: Interest Shortfalls from Prior Periods			—

Total Class B Note Interest Due			11,255.64

Calculation of Class B Interest Amount Paid

Available Collections After Servicing Fee, Class A Interest and First Priority Principal			11,853,004.24
Available Collection Shortfall			—
Reserve Account Draw			—

Class B Interest Amount Paid			11,255.64

Class B Interest Shortfall Carryforward			0.00

Calculation of Regular Principal Distribution Amount:

Aggregate Beginning Outstanding Note Balance			203,600,611.80
Less:
Ending Pool Balance	208,667,703.41
Less: Target Overcollateralization Amount	(16,496,184.24	)	192,171,519.17

Less: First Priority Principal Distribution Amount			—

Regular Principal Distribution Amount before Reserve Account Draw Amount			11,429,092.63

Available Funds, before Reserve Account Draw			11,841,748.59
Available Funds Shortfall Amount			—
Reserve Account Draw Amount			—

Regular Principal Distribution Amount Paid			11,429,092.63

Bank One Auto Securitization Trust 2003-1

Monthly Servicer Certificate

For the Collection Period ended: February 28, 2006

PAGE 3


Class A Principal Distribution Amount Due:

The Greater of:
(A) The Beginning Class A-1 Note Balance		—
(B) The Beginning Class A Note Balance minus the lesser of:		197,168,815.84
(i) the product of (x) the Ending Pool Balance and (y) 88.75% plus a % equivalent of a fraction equal to the Reserve Account (prior to deposits) divided by the Ending Pool Balance		187,025,496.14

		10,143,319.71

(ii) the excess of (x) the Ending Pool Balance over (y) the Target
Overcollateralization Amount		192,171,519.17

		4,997,296.67

Class A Principal Distribution Amount		10,143,319.71

Class B Principal Distribution Amount Due:

The excess of (A) the sum of (i) the Ending Class A Note Balance and (ii) the
Beginning Class B Note Balance over (B) the excess of (x) the Ending Pool
Balance and (y) the Target Overcollateralization Amount		1,285,772.92

Class B Principal Distribution Amount		1,285,772.92

Principal Distribution Amount Paid:

Available Collections for Principal Distribution		11,841,748.59
(i) To the Class A Notes, sequentially:
(a) Class A-1 Notes		—
(a) Class A-2 Notes		—
(a) Class A-3 Notes		10,143,319.71
(a) Class A-4 Notes		—
(ii) To the Class B Notes		1,285,772.92
(iii) To the Certificateholder		412,655.96
Target Overcollateralization Amount

Lesser of:
(A) 2.25% of the Initial Pool Balance		16,496,184.24
(B) The greater of:
(i) 0.75% of the Initial Pool Balance less the Pre-Addition Reserve Balance		3,659,605.19
(ii) 11.25% of the Ending Pool Balance less the Pre-Addition Reserve Balance		21,642,207.27

Target Overcollateralization Amount		16,496,184.24

Overcollateralization Amount

Beginning Overcollateralization Amount		16,496,184.24
Target Overcollateralization Amount		16,496,184.24
Overcollateralization Excess/(Deficiency)		—
Overcollateralization Release Amount		—
Overcollateralization Increase Amount		—

Overcollateralization Amount		16,496,184.24

Reserve Account

Beginning Reserve Account Balance		1,832,909.36
Plus: Interest Accrued		6,213.53
Less: Reserve Account Draw		—
Reserve Account Balance Prior to Deposits		1,839,122.89
Specified Reserve Account Balance is Greater of:
(a) 0.80% of Ending Pool Balance		1,669,341.63
(b) 0.25% of the Initial Pool Balance		1,832,909.36
Reserve Account (Deficiency)/Excess		6,213.53
Deposit of Excess Available Funds		—
Release of excess reserve		6,213.53

Ending Reserve Account Balance		1,832,909.36

Bank One Auto Securitization Trust 2003-1

Monthly Servicer Certificate

For the Collection Period ended: February 28, 2006

PAGE 4


POOL STATISTICS

Collateral Pool Balance Data:
			Initial		Current
Net Pool Balance			733,163,743.80		208,667,703.41
Number of Current Contracts			41,825		22,863
Weighted Average Loan Rate			6.4000	%	6.3572	%
Weighted Average Remaining Term (months)			56.6		28.7

Net Loss Activity:
			Units		Principal Balance
Principal Losses for Current Collection Period			26		183,686.02
Less: Recoveries from Prior Months Charge offs					48,160.64
Net Principal Losses for Current Collection Period					135,525.38
Monthly Net Loss Rate (Annualized)					0.7389	%

Beginning Net Principal Losses			970		6,908,461.39
Net Principal Losses for Current Collection Period			26		135,525.38
Cumulative Net Principal Losses			996		7,043,986.77
Cumulative Net Principal Loss Rate					0.9608	%

Receivables for which related Financed Vehicle has been repossessed and not liquidated			12		117,834.05

Delinquencies Aging Profile - End of Period:
	Percentage $		Units		Outstanding Principal Balance
	Percentage $		Units		Outstanding Principal Balance
Current	87.37	%	20,386		182,322,017.94
1 - 29 Days Delinquent	10.28	%	2,034		21,454,991.54
30 - 59 Days Delinquent	1.36	%	262		2,839,444.73
60 - 89 Days Delinquent	0.47	%	79		981,965.59
90 - 119 Days Delinquent	0.17	%	38		346,650.24
120-149 Days Delinquent	0.16	%	29		339,333.62
150-179 Days Delinquent	0.05	%	11		113,668.84
180+ Days Delinquent	0.13	%	24		269,630.91

Total			22,863		208,667,703.41

IN WITNESS WHEREOF, the undersigned has duly executed and delivered this Certificate on this 16th day of March, 2006.


JPMorgan Chase Bank, NA (formerly Bank One, NA)
as Servicer

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

BANK ONE AUTO SECURITIZATION TRUST 2003-1 8-K