Radio Clock - Stuck on 12:00 and Cannot Be Changed

File In Section: 8 - Chassis/Body Electrical

Bulletin No: 53-81-22

Date: November, 1995

Subject:
Clock Malfunction - Radio Clock Stuck on 12:00 and Cannot be Changed (Replace Body Control Module)

Models:
1996 Cadillac Concours, DeVille, Eldorado, Seville

Model Built Prior to VIN Breakpoint
Concours TU202032
DeVille TU202019
Eldorado TU600446
Eldorado Touring TU600447
Seville TU800694
Seville Touring TU800695

Condition

Some owners may comment on the radio clock being stuck on 12:00 and cannot be changed.

Cause

This condition may result from a fluctuation of system voltage to the Body Control Module (PZM).

Correction

Install updated Body Control Module (PZM) using the following procedure.

Remove or Disconnect

1. "Comfort" fuse B9 from trunk compartment fuse block.
2. Rear seat cushion.
3. Rear seat back.
4. Body Control Module (PZM) from vehicle.
5. MEMCAL from PZM.

Install or Connect

1. MEMCAL in new PZM.
2. PZM in vehicle.
3. Rear seat back.
4. Rear seat cushion.
5. "Comfort" fuse B9 in trunk compartment fuse block.
6. Reprogram PZM override PZS33 according to the following values:

E = 6 = Eldorado
K = 4 = Seville
Ksp = 5 = DeVille/Concours

7. Hold the front "Defrost" and "Auto/Econ" ("A/C" for analog IPC) for approximately 5 seconds until the display flashes.
8. Cycle ignition.

Parts Information

Part Name P/N
Body Control Module (PZM) 16233374

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation Labor Time
T2720 0.6 hr