Radio Clock - Gains Time
File in Section: 9 - AccessoriesBulletin No.: 63-90-15
Date: November, 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
Description Part Number
Body Control Module (PZM) 16238499
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
N48OO Computer Use published
(Control), Body labor operation
Replace time.