EXCHANGE PROGRAM 1996 MODELS VCM

SUBJECT: EXCHANGE PROGRAM -- 1996 MODELS VCM (VEHICLE CONTROL MODULE)

MODELS: 1996 CHEVROLET AND GMC TRUCK LIGHT DUTY MODELS 1996 OLDSMOBILE BRAVADA WITH 7.4L, 5.7L, 5.0L, 4.3L ENGINES (VINS J, M, R, W, X - RPOS L29, L30, L31, L35, LF6)

THIS BULLETIN IS BEING REVISED TO CORRECT THE MODELS INVOLVED.

********************************************************************** 'GM OF CANADA' AND 'NAES' DEALERS ARE NOT AUTHORIZED TO UTILIZE THIS SERVICE BULLETIN. **********************************************************************

THE PURPOSE OF THIS BULLETIN IS TO ANNOUNCE A PARTS MANAGEMENT/EXCHANGE PROGRAM FOR THE 1996 VCM (VEHICLE CONTROL MODULE) ON THE ABOVE LISTED MODELS. THIS PROGRAM PROVIDES A REPLACEMENT VCM IN EXCHANGE FOR INOPERATIVE ONES AND ADDITIONAL SUPPORT IN DIAGNOSIS OF THE SYSTEM. EXCHANGE UNITS ARE OBTAINED BY CONTACTING YOUR DIVISIONAL TECHNICAL ASSISTANCE CENTER.

ALL VCM UNITS ARE SERVICED BY PART NUMBER 16208546.

THE FOLLOWING PROCEDURE IS TO BE USED:

PLEASE ADHERE TO THE DIAGNOSTIC PROCEDURES FOUND IN ATTACHMENT 1 PRIOR TO CONTACTING TECHNICAL ASSISTANCE.

1. THE TECHNICAL ASSISTANCE CENTER WILL REQUIRE THE FOLLOWING INFORMATION:

-VIN -TECHNICIAN'S NAME -DEALER CODE

2. DIAGNOSTIC INFORMATION GATHERED DURING TROUBLESHOOTING SHOULD BE RECORDED ON THE VCM EXCHANGE WORKSHEET (SEE ATTACHMENT 2). 3. THE TECHNICAL ASSISTANCE CONTACT WILL REVIEW THE DIAGNOSTICS PERFORMED AND MAY SUGGEST ADDITIONAL TESTING. 4. ONCE THE TECHNICAL ASSISTANCE CENTER CONFIRMS WITH THE TECHNICIAN THAT A VCM IS NEEDED, THEY WILL PROVIDE A CASE REFERENCE NUMBER AND A REPLACEMENT VCM WILL BE SHIPPED FROM GMSPO WITHIN 48 HOURS. 5. THE REPLACED UNIT MUST BE SHIPPED BACK TO GMSPO IN ACCORDANCE WITH THE HOT CORE PROGRAM. THE CORE INFORMATION TAG (FOR VCM) MUST BE COMPLETELY FILLED OUT AND A COPY OF THE REPAIR ORDER (WITH THE CASE REFERENCE NUMBER) INCLUDED TO AID IN PROPER ANALYSIS. 6. IF THE VCM SHIPMENT IS NOT RECEIVED WITHIN 48 HOURS, CONTACT THE TECHNICAL ASSISTANCE CENTER.

FIGURES: 0 ATTACHMENTS: 2

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.

COPYRIGHT 1995 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.

ATTACHMENT 1 COMPLAINT VERIFIED

PERFORM BULLETIN SEARCH

NO BULLETIN BULLETIN

PERFORM OBD SYSTEM CHECK. PERFORM SERVICE BULLETIN RECORD VCM CALIBRATION I.D. PROCEDURE, RE-EVALUATE

OK NOT OK

PERFORM PRELIMINARY REPAIR/RETEST CHECKS AS OUTLINED IN SECTION 2 OF DRIVEABILITY SERVICE MANUAL.

OK NOT OK

REPAIR/RETEST

DTCS NO DTCS

RECORD STATUS MESSAGES PERFORM APPLICABLE DIAGNOSTIC CHECK FREEZE FRAME/FAULT RECORD FOUND IN SECTION 2 OF DRIVEABILITY SERVICE MANUAL.

FOLLOW DIAGNOSTIC CHART PROBLEM FOUND?

IS VCM NEEDED TO COMPLETE NO YES REPAIR?

NO YES REPAIR/RETEST

REPAIR AS PER DIAGNOSTIC CONTACT TECHNICAL ASSISTANCE CHART

ATTACHMENT 2

VCM EXCHANGE WORKSHEET

VIN ____________________________ TECHNICIAN'S NAME ____________________________ DEALER CODE ____________________________

VERIFIED SYMPTOM ___________________________________________________________________ ___________________________________________________________________ ________________________

PREVIOUS REPAIRS ___________________________________________________________________ ___________________________________________________________________ ________________________

STORED DTC'S

______________

CALIBRATIONS I.D.

ENGINE _______ TRANSMISSION _______ HVAC _______ ABS _______ VEHICLE SPEED _______

STATUS MESSAGES

LAST TEST FAILED ________ FAILED THIS IGNITION ________ FAILED SINCE CODE CLEARED ________ HISTORY DTC ________ MIL REQUESTED ________ TEST NOT RUN SINCE CLEARED ________

FREEZE FRAME/FAULT RECORDS DATA

DTC ________ LTFT ________ ENGINE SPEED ________ STFT ________ ECT ________ CAL ENGINE LOAD ________ MAP ________ LOOP STATUS ________ MPH/KM/H ________