RADIO CLOCK GAINS TIME (INSTALL UPDATED BCM). Cadillac DeVille 1996

SUBJECT: RADIO CLOCK GAINS TIME (INSTALL UPDATED BODY CONTROL MODULE)

MODELS: 1996 CADILLAC CONCOURS, DEVILLE, ELDORADO AND SEVILLE

BUILT PRIOR TO THE FOLLOWING VIN BREAKPOINTS:

MODEL VIN BREAKPOINT ===== ==============

CONCOURS/DEVILLE TU305353 ELDORADO TU619572 SEVILLE TU836232

CONDITION:

SOME OWNERS OF THE ABOVE LISTED VEHICLES MAY COMMENT THAT THE RADIO CLOCK MAY TEND TO GAIN TIME. UP TO 2-3 MINUTES A MONTH MAY BE GAINED DEPENDING ON THE AMBIENT TEMPERATURE.

CAUSE:

THE CLOCK TUNING CIRCUITRY IN THE BODY CONTROL MODULE (PZM) IS NOT PRECISE ENOUGH TO MAINTAIN THE REQUIRED CLOCK ACCURACY OF +/- 1 MINUTE A MONTH.

CORRECTION:

INSTALL AN UPDATED BODY CONTROL MODULE (PZM) USING THE FOLLOWING PROCEDURE.

IMPORTANT: THIS SERVICE PART CONTAINS AN INSTALLED PROM. DO NOT OPEN THE PART AS INDICATED IN THE SERVICE MANUAL. THIS BULLETIN SUPERSEDES THE PZM INSTALL/CONNECT PROCEDURE AS INDICATED ON ALL PREVIOUS BULLETINS.

REMOVE OR DISCONNECT

1. COMFORT FUSE FROM THE TRUNK COMPARTMENT FUSE BLOCK.

2. REAR SEAT CUSHION AND SEAT BACK.

3. INSPECT BODY CONTROL MODULE (PZM).

- IF SERVICE PART NUMBER IS 16247212 OR 16238499 THE PZM HAS ALREADY BEEN UPDATED FOR THIS CONCERN AND SHOULD NOT BE GAINING TIME; RECONFIRM CONCERN WITH OWNER BEFORE REMOVING PART.

INSTALL OR CONNECT

1. BODY CONTROL MODULE (PZM).

2. REAR SEAT BACK AND SEAT CUSHION.

3. COMFORT FUSE IN TRUNK COMPARTMENT FUSE BLOCK.

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

E = 6 = ELDORADO K = 4 = SEVILLE KSP = 5 = CONCOURS/DEVILLE

5. STORE VALUE:

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

6. CYCLE IGNITION.

PARTS INFORMATION:

BODY CONTROL MODULE (PZM) P/N 16238499

PARTS ARE EXPECTED TO BE AVAILABLE OCTOBER 21, 1996.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION LABOR OPERATION NUMBER DESCRIPTION TIME =============== =========== ===============

N4800 COMPUTER (CONTROL), BODY - USE PUBLISHED REPLACE LABOR OPERATION TIME.

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.