INACCURATE FUEL GAGE DISPLAY. Cadillac DeVille 1996

SUBJECT: INACCURATE FUEL GAUGE DISPLAY (INSTALL UPDATED BODY CONTROL MODULE AND PROM)

MODELS: 1996 CADILLAC CONCOURS, DEVILLE, ELDORADO, SEVILLE BUILT PRIOR TO VIN BREAKPOINTS:

CONCOURS/DEVILLE TU245429 ELDORADO TU607684 SEVILLE TU812984

CONDITION:

AT KEY ON, SOME OWNERS MAY COMMENT ON AN INACCURATE FUEL LEVEL DISPLAY. THE FUEL GAUGE MAY SHOW FULL, THEN SLOWLY RETURN TO THE PROPER LEVEL.

CAUSE:

THIS CONDITION MAY BE CAUSED BY A BODY CONTROL MODULE (PZM) MISCALIBRATION.

CORRECTION:

INSTALL UPDATED BODY CONTROL MODULE (PZM) AND PROM, USING THE FOLLOWING PROCEDURE.

REMOVE OR DISCONNECT:

1. COMFORT FUSE FROM THE TRUNK COMPARTMENT FUSE BLOCK.

2. REAR SEAT CUSHION AND SEAT BACK.

3. BODY CONTROL MODULE (PZM).

INSTALL OR CONNECT:

1. UPDATED PROM INTO UPDATED BODY CONTROL MODULE (PZM).

2. BODY CONTROL MODULE (PZM).

3. REAR SEAT BACK AND SEAT CUSHION.

4. COMFORT FUSE IN TRUNK COMPARTMENT FUSE BLOCK.

5. REPROGRAM PZM OVERRIDE PZS33 ACCORDING TO THE FOLLOWING VALUES:

E = 6 = ELDORADO

K = 4 = SEVILLE

KSP = 5 = CONCOURS/DEVILLE

6. STORE VALUE:

- HOLD THE FRONT "DEFROST" AND "AUTO/ECON" ("A/C" FOR ANALOG IPC) FOR APPROXIMATELY 5 SECONDS UNTIL THE DISPLAY FLASHES.

7. CYCLE IGNITION.

PARTS INFORMATION:

BODY CONTROL MODULE (PZM) P/N 16239554 PROM P/N 16238497

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: N4800 LABOR TIME: 0.6 HR

FIGURES: 00 ATTACHMENTS: 00

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.