Servicer's Certificate (Pursuant to Section 3.9 of the Pooling and Servicing Agreement, dated June 1, 1996) Banc One Auto Trust 1996-B Interest Period September 15, 1997 through October 14, 1997 Collection Period September 1, 1997 through September 30, 1997 The undersigned officer of Bank One, Texas N.A., pursuant to the Pooling and Servicing Agreement, as Servicer, does hereby certify to the best of his knowledge and belief that the attached information is true and correct. Signed by: /s/ Tom Lewis ---------------------- Tom Lewis Vice President Bank One, Arizona, N.A. A. ORIGINAL DEAL PARAMETER INPUTS ------------------------------ (A) Total Receivable Balance 305,686,731.00 (B) Total Certificate Balance 305,686,731.00 (C) Class A Certificates (i) Class A Percentage 96.00% (ii) Original Class A Principal Balance 293,459,000.00 (iii) Class A Pass-Through Rate 6.55% (D) Class B Certificates (i) Class B Percentage 4.00% (ii) Original Class B Principal Balance 12,227,731.00 (iii) Class B Pass-Through Rate 6.70% (E) Servicing Fee Rate (per annum) 1.00% (F) Weighted Average Coupon (WAC) 12.15% (G) Weighted Average Original Maturity (WAOM) 60.12 months (H) Weighted Average Remaining Maturity (WAM) 45.97 months (I) Number of Receivables 31,595 (J) Reserve Fund (i) Reserve Fund Initial Deposit Percentage (of initial Certificate Balance) 1.50% (ii) Reserve Fund Initial Deposit 4,585,300.97 (iii) Specified Reserve Balance: (a) On any Distribution Date: The greater of J(iii)(b or c) if 1.75% charge-off and delinquency triggers not hit - otherwise J(iii)(d) (b) Percent of Initial Certificate Balance 1.00% (c) Percent of Remaining Certificate Balance 3.25% (d) Trigger Percent of Remaining Certificate Balance 8.00% B. INPUTS FROM PREVIOUS MONTHLY SERVICER REPORTS --------------------------------------------- (A) Total Receivable Balance 155,116,917.19 (B) Total Certificate Balance 155,116,917.19 (C) Total Certificate Pool Factor 0.5074375 (D) Class A Certificates (i) Class A Certificate Balance 148,912,107.17 (ii) Class A Certificate Pool Factor 0.5074375 (E) Class B Certificates 6,204,810.02 (i) Class B Certificate Balance 0.5074375 (ii) Class B Certificate Pool Factor 5,041,299.81 (F) Reserve Fund Balance (G) Cumulative Net Losses for All Prior Periods 7,023,255.00 (H) Charge-off Rate for Second Preceding Period 0.86% (I) Charge-off Rate for Preceding Period 1.90% (J) Delinquency Percentage for Second Preceding Period 0.48% (K) Delinquency Percentage for Preceding Period 0.65% (L) Weighted Average Coupon (WAC) 12.120% (M) Weighted Average Remaining Maturity (WAM) 37.14 months (N) Number of Receivables 20,780 C. INPUTS FROM THE MAINFRAME ------------------------- (A) Simple Interest Receivables Principal (i) Principal Collections 8,514,541.34 (ii) Prepayments in Full 0.00 (iii) Repurchased Loan Proceeds Related to Principal 0.00 (iv) Other Refunds Related to Principal 0.00 (B) Simple Interest Receivables Interest (i) Interest Collections 1,579,411.89 (ii) Repurchased Loan Proceeds Related to Interest 0.00 (C) Weighted Average Coupon (WAC) 0.00% (D) Weighted Average Remaining Maturity (WAM) 0.00 months (E) Remaining Number of Receivables 19,800 (F) Delinquent Receivables Dollar Amount # Units -------------- -------- (i) 30-59 Days Delinquent 3,516,651 2.40% 460 (ii) 60-89 Days Delinquent 674,955 0.46% 94 (iii) 90 Days or More Delinquent 372,340 0.25% 42 D. INPUTS DERIVED FROM OTHER SOURCES --------------------------------- (A) Reserve Fund Investment Income 0.00 (B) Collection Account Investment Income 0.00 (C) Realized Losses for Collection Period: (i) Charge-offs for current Collection Period - Principal 236,682.64 (ii) Realized Losses for Collection Period (B)(i)-(D)(i) 196,028.25 (D) Net Loss and Liquidated Receivables Information (i) Liquidation Proceeds Related to Principal 40,654.39 (ii) Liquidation Proceeds Related to Interest 0.00 (iii) Recoveries from Prior Month Charge Offs 199,942.22 E. COLLECTIONS ----------- Interest Collections: (A) Interest Payments Received 1,579,411.89 (B) Liquidation Proceeds Related to Interest 0.00 (C) Repurchased Loan Proceeds 0.00 (D) Recoveries from Prior Month Charge Offs 199,942.22 -------------------------- (E) Interest Collections 1,779,354.11 Principal Collections: (F) Principal Payments Received 8,514,541.34 (G) Liquidation Proceeds Related to Principal 40,654.39 (H) Repurchased Loan Proceeds 0.00 -------------------------- (I) Principal Collections 8,555,195.73 (J) Total Collections 10,334,549.84 F. DISTRIBUTABLE AMOUNTS --------------------- (A) Servicing Fee: (i) Servicing Fee 129,264.10 (ii) Prior Collection Period unpaid Servicing Fees 0.00 -------------------------- (iii) Total Servicing Fee 129,264.10 Interest: (B) Class A Certificates (i) Class A Monthly Interest 812,811.92 (ii) Class A prior period Interest Carryover Shortfall 0.00 -------------------------- (iii) Class A Interest Distribution 812,811.92 (C) Class B Certificates (i) Class B Monthly Interest 34,643.52 (ii) Class B prior period Interest Carryover Shortfall 0.00 -------------------------- (iii) Class B Interest Distribution 34,643.52 (D) Total Certificate Interest Distribution 847,455.44 (E) Total Certificate Interest Distribution plus Total Servicing Fee 976,719.54 Principal: (F) Principal Collections 8,555,195.73 (G) Realized Losses 196,028.25 -------------------------- (H) Total Monthly Principal 8,751,223.98 (I) Class A Certificates (i) Class A Monthly Principal 8,401,167.53 (ii) Class A prior period Principal Carryover Shortfall 0.00 -------------------------- (iii) Class A Principal Distribution 8,401,167.53 (J) Class B Certificates (i) Class B Monthly Principal 350,056.45 (ii) Class B prior period Principal Carryover Shortfall 0.00 -------------------------- (iii) Class B Principal Distribution 350,056.45 (K) Total Principal Distribution 8,751,223.98 (L) Total Interest and Principal Distribution Amounts plus Servicing Fee 9,727,943.52 G. DISTRIBUTIONS ------------- (A) Total Interest Collections available to be distributed 1,779,354.11 (B) Class B Percentage of Principal Collections 342,215.16 (C) Servicing Fee: (i) Total Servicing Fee 129,264.10 (ii) Servicing Fee paid 129,264.10 -------------------------- (iii) Unpaid Servicing Fee 0.00 (D) Total Interest Collections available to be distributed after Servicing Fee paid 1,650,090.01 Interest: (E) Class A Certificates (i) Class A Interest Distribution 812,811.92 (ii) Class A Interest Distribution paid from Interest Collections after Servicing Fee 812,811.92 (iii) Total Interest Collections available after Class A Interest Distribution paid 837,278.09 (iv) Class A Interest Distribution remaining to be paid 0.00 (v) Class A Interest Distribution paid from Class B Percentage of Principal Collections 0.00 (vi) Class A Interest Distribution remaining to be paid 0.00 (vii) Class A Interest Distribution paid from Reserve Fund 0.00 (viii) Class A Interest Carryover Shortfall 0.00 (ix) Class A Interest Distribution paid 812,811.92 (F) Class B Certificates (i) Class B Interest Distribution 34,643.52 (ii) Class B Interest Distribution paid from Interest Collections after Class A Interest Distribution 34,643.52 (iii) Total Interest Collections available after Class B Interest Distribution paid 802,634.57 (iv) Class B Interest Distribution remaining to be paid 0.00 (v) Class B Interest Distribution paid from Reserve Fund 0.00 (vi) Class B Interest Carryover Shortfall 0.00 (vii) Class B Interest Distribution paid 34,643.52 (G) Total Interest Paid 847,455.44 (H) Total Interest and Servicing Fee Paid 976,719.54 (I) Total Interest Collections available after Servicing Fee and Class A and Class B Interest Distribution paid 802,634.57 Total Collections available to be distributed: (J) Total Principal Collections 8,555,195.73 (K) Excess Interest 802,634.57 (L) Less: Class B Percentage of Principal Collections used to pay Class A Interest Distribution 0.00 (M) Total Collections available to be distributed as principal 9,357,830.30 Principal: (N) Class A Certificates (i) Class A Principal Distribution 8,401,167.53 (ii) Class A Principal Distribution paid from total Collections available to be distributed 8,401,167.53 (iii) Total Collections available after Class A Principal Distribution paid 956,662.77 (iv) Class A Principal Distribution remaining to be paid 0.00 (v) Class A Principal Distribution paid from Reserve Fund 0.00 (vi) Class A Principal Carryover Shortfall 0.00 (vii) Total Class A Principal Distribution paid 8,401,167.53 (O) Class B Certificates (i) Class B Principal Distribution 350,056.45 (ii) Class B Principal Distribution paid from total Collections available to be distributed 350,056.45 (iii) Total Collections available after Class B Principal Distribution paid 606,606.32 (iv) Class B Principal Distribution remaining to be paid 0.00 (v) Class B Principal Distribution paid from Reserve Fund 0.00 (vi) Class B Principal Carryover Shortfall 0.00 (vii) Total Class B Principal Distribution paid 350,056.45 (P) Total Excess Cash to the Reserve Fund 606,606.32 H. POOL BALANCE AND PORTFOLIO INFORMATION -------------------------------------- Beginning End of Period of Period ------------------------ ---------------------- (A) Balances and Pool Factors (i) Aggregate Balance of Certificates 155,116,917.19 146,365,693.21 (ii) Aggregate Certificate Pool Factor 0.5074375 0.4788094 (iii) Class A Principal Balance 148,912,107.17 140,510,939.64 (iv) Class A Pool Factor 0.5074375 0.4788094 (v) Class B Principal Balance 6,204,810.02 5,854,753.57 (vi) Class B Pool Factor 0.5074375 0.4788095 (B) Pool Information (i) Weighted Average Coupon (WAC) 12.12% 0.00% (ii) Weighted Average Remaining Maturity (WAM) 37.14 months 0.00 months (iii) Remaining Number of Receivables 20,780 19,800 (iv) Pool Balance 155,116,917.19 146,365,693.21 I. RECONCILIATION OF RESERVE ACCOUNT --------------------------------- (A) Beginning Reserve Account Balance 5,041,299.81 (B) Less: Draw to pay Class A Interest Distribution 0.00 (C) Reserve Account Balance after draw 5,041,299.81 (D) Less: Draw to pay Class B Interest Distribution 0.00 (E) Reserve Account Balance after draw 5,041,299.81 (F) Less: Draw to pay Class A Principal Distribution 0.00 (G) Reserve Account Balance after draw 5,041,299.81 (H) Less: Draw to pay Class B Principal Distribution 0.00 (I) Reserve Account Balance after draw 5,041,299.81 (J) Total excess Collections deposited in the Reserve Fund 606,606.32 ---------------------- (K) Reserve Fund Balance 5,647,906.13 (L) Specified Reserve Account Balance 4,756,885.03 (M) Reserve Account Release to Seller 891,021.10 ---------------------- (N) Ending Reserve Account Balance 4,756,885.03 ====================== J. NET LOSS AND DELINQUENCY ACCOUNT ACTIVITY ----------------------------------------- (A) Liquidated Contracts (i) Liquidation Proceeds Related to Principal 40,654.39 (ii) Liquidation Proceeds Related to Interest 0.00 (iii) Recoveries on Previously Liquidated Contracts 199,942.22 (B) Realized Net Losses for Collection Period 196,028.25 (C) Charge-off Rate for Collection Period (annualized) -0.03% (D) Cumulative Aggregate Net Losses for all Periods 7,219,283.25 (E) Delinquent Receivables Dollar Amount # Units -------------- -------- (i) 30-59 Days Delinquent 3,516,651 2.40% 460 (ii) 60-89 Days Delinquent 674,955 0.46% 94 (iii) 90 Days or More Delinquent 372,340 0.25% 42 K. TESTS FOR INCREASE IN SPECIFIED RESERVE ACCOUNT BALANCE ------------------------------------------------------- (A) Charge-off Rate (i) Second Preceding Collection Period 0.86% (ii) Preceding Collection Period 1.90% (iii) Current Collection Period -0.03% (iv) Three Month Average (Avg(i,ii,iii)) 0.91% (B) Delinquency Percentages (i) Second Preceding Collection Period 0.48% (ii) Preceding Collection Period 0.65% (iii) Current Collection Period 0.72% (iv) Three Month Average (Avg(i,ii,iii)) 0.62% (C) Loss and Delinquency Trigger Indicator Trigger was not hit L. STATEMENT TO CERTIFICATEHOLDERS ------------------------------- Per $1,000 of Original Principal (A) Amount of distribution allocable to principal: Dollars ($) Balance -------------------------- ---------------------- (i) Class A Certificates 8,401,167.53 28.6280793 (ii) Class B Certificates 350,056.45 28.6280793 Per $1,000 of Original Principal (B) Amount of distribution allocable to interest: Dollars ($) Balance -------------------------- ---------------------- (i) Class A Certificates 812,811.92 2.7697631 (ii) Class B Certificates 34,643.52 2.8331931 (C) Pool Balance as of the close of business on the last day of the Collection Period 146,365,693.21 -------------------------- Per $1,000 of (D) Amount of the Servicing Fee paid to the Servicer with respect Original Principal to the related Collection Period Dollars ($) Balance -------------------------- ---------------------- (i) Total Servicing Fee 129,264.10 (ii) Class A Percentage of the Servicing Fee 124,093.42 0.4228646 (ii) Class B Percentage of the Servicing Fee 5,170.67 0.4228646 Per $1,000 of Original Principal Dollars ($) Balance -------------------------- ---------------------- (E) (i) Class A Interest Carryover Shortfall 0.00 0.0000000 (ii) Class A Principal Carryover Shortfall 0.00 0.0000000 (iii) Class B Interest Carryover Shortfall 0.00 0.0000000 (iv) Class B Principal Carryover Shortfall 0.00 0.0000000 Change with respect to immediately preceding Distribution Date: (v) Class A Interest Carryover Shortfall 0.00 0.0000000 (vi) Class A Principal Carryover Shortfall 0.00 0.0000000 (vii) Class B Interest Carryover Shortfall 0.00 0.0000000 (viii) Class B Principal Carryover Shortfall 0.00 0.0000000 (F) Pool factors for each class of certificates, after giving effect to all payments allocated to principal Pool Factor ---------------------- (i) Class A Pool Factor 0.4788094 (ii) Class B Pool Factor 0.4788095 (G) Amount of the aggregate Realized Losses, if any, for such 196,028.25 Collection Period ($) -------------------------- (H) Aggregate principal balance of all Receivables which were more than 60 days delinquent as of the close of business on the last 1,047,294.90 day of the preceding Collection Period (I) Amount on deposit in the Reserve Fund on such Distribution Date, after giving effect to distributions made on such Distribution Date 4,756,885.03 -------------------------- (J) Aggregate outstanding principal balances for each class of certificates, after giving effect to all payments allocated to principal Principal Balance ---------------------- (i) Class A Principal Balance 140,510,939.64 (ii) Class B Principal Balance 5,854,753.57 (K) Amount otherwise distributable to the Class B Certificateholders that is being distributed to the Class A Certificateholders on such Distribution Date 0.00 (L) Aggregate Purchase Amount of Receivables repurchased by the Seller or purchased by the Servicer with respect to the Related Collection Period ($) 0.00 -------------------------- M. INSTRUCTIONS TO THE TRUSTEE --------------------------- On the Distribution Date, make the following deposits and distributions: (A) Withdraw from the Collection Account and distribute to the Servicer: (i) Servicing Fee 129,264.10 (ii) Servicing Fees retained by the Seller 129,264.10 -------------------------- (iii) Servicing Fees to be distributed to the Seller on the Distribution Date (i-ii) 0.00 -------------------------- (B) Withdraw from the Collection Account and deposit in the Class A Distribution Account: (i) for the Class A Interest Distribution 812,811.92 (ii) for the Class A Principal Distribution 8,401,167.53 -------------------------- (iii) Total (i+ii) 9,213,979.45 -------------------------- (C) Withdraw from the Collection Account and deposit in the Class B Distribution Account: (i) for the Class B Interest Distribution 34,643.52 (ii) for the Class B Principal Distribution 350,056.45 -------------------------- (iii) Total (i+ii) 384,699.98 -------------------------- (D) Withdraw excess Collections from the Collection Account and deposit in the Reserve Fund 606,606.32 -------------------------- (E) Withdraw from the Reserve Fund and deposit in the Class A Distribution Account: (i) Amount equal to the excess of the Class A Interest Distribution over the sum of Interest Collections and the Class B Percentage of Principal Collections 0.00 (ii) Amount equal to the excess of the Class A Principal Distribution over the portion of Principal Collections and Interest Collections remaining after the distribution of the Class A Interest Distribution and the Class B Interest Distribution 0.00 -------------------------- (iii) Total 0.00 -------------------------- (F) Withdraw from the Reserve Fund and deposit in the Class B Distribution Account: (i) Amount equal to the excess of the Class B Interest Distribution over the portion of Interest Collections remaining after the distribution of the Class A Interest 0.00 Distribution (ii) Amount equal to the excess of the Class B Principal Distribution over the portion of Principal Collections and Interest Collections remaining after the distribution of the Class A Interest Distribution, the Class B Interest Distribution, and the Class A Principal Distribution 0.00 --------------------------- (iii) Total 0.00 ------------------------