INFO. ON 'ETS OFF' INDICATOR LAMP ON

SUBJECT: INFORMATION ON "ETS OFF" INDICATOR LAMP ON WITH NO DTC'S SET

MODELS: 1996 BUICK SKYLARK 1996 CHEVROLET CAVALIER 1996 OLDSMOBILE ACHIEVA 1996 PONTIAC GRAND AM, SUNFIRE

ON VEHICLES EQUIPPED WITH ENHANCED TRACTION SYSTEM (ETS), THE "ETS OFF" INDICATOR LAMP MAY COME ON AND ETS AND CRUISE CONTROL MIGHT BECOME DISABLED. THERE MAY BE NO ABS OR PCM DIAGNOSTIC TROUBLE CODES (DTC'S) STORED AND THERE MAY BE NO "CHECK ENGINE" LAMP ON. THIS CONDITION HAS CAUSED A HIGH RATE OF UNNECESSARY IPC REPLACEMENTS.

THE PCM SETS A TYPE "C" OR "D" FAILURE RECORD WHICH SENDS A MESSAGE TO THE ELECTRONIC BRAKE CONTROL MODULE (EBCM) TO TURN THE "ETS OFF" INDICATOR ON AND TO DISABLE ETS. THE PCM CAN THEN DISABLE CRUISE CONTROL, BUT MAY NOT TURN ON A CORRESPONDING "CHECK ENGINE" LAMP. THESE TYPE "C" OR "D" FAILURE RECORDS ARE NOT STORED IN THE NORMAL CURRENT OR HISTORY MENUS.

THE TECHNICIAN IS INSTRUCTED TO CHECK NORMAL OPERATION OF THE "ETS OFF" SWITCH AND THE ETS SYSTEM. THE TECHNICIAN IS THEN INSTRUCTED TO CHECK FOR FAILURE RECORDS AND DIRECTED TO SECTION 6E3-A OF THE SERVICE MANUAL, SEE ATTACHED CHART. WHEN THE PCM FAILURE RECORD IS CORRECTED, NORMAL OPERATION OF THE ETS SYSTEM AND CRUISE CONTROL SHOULD RETURN.

FIGURES: 00 ATTACHMENTS: 01

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.

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