Digital Cluster - Blank, Speedometer at 188 W/Horn On
BULLETIN NUMBER: 93-8C-81SECTION: 8C Instrument Panel
NUMBER: 4
CORPORATE
REFERENCE NUMBER: 368301
DATE: May 1993
SUBJECT:
DIGITAL CLUSTER GOES BLANK OR SPEEDOMETER READS 188 WHEN HORN IS DEPRESSED (INSTALL HORN KIT)
MODELS:
1993 S/T WITH DIGITAL IP CLUSTER (RPO U52)
CONDITION
Some 1993 S/T trucks with RPO U52 Digital IP Clusters may experience an intermittent blank IP cluster or a reading of 188 on the speedometer display when the ignition is on and the horn is depressed.
CAUSE
This condition is caused by a voltage spike in the horn circuit when the horn is actuated.
CORRECTION
To correct this condition engineering has released two service horn kits that have built-in electrical suppression. Vehicles have been corrected in production after the following VIN's:
Pontiac West P0513648
Moraine P2523127
Shreveport P8519090
SERVICE PROCEDURE
1. Disconnect and remove "F" note horn from the left radiator support.
2. Assemble "F" note horn and bracket from Horn Kit (P/N 10456443).
3. Install and connect the horn.
4. Disconnect and remove "A" note horn from the left inner fender.
a. T-Truck - Remove the oil filter. If equipped with an L35 engine, remove the air cleaner assembly.
5. Assemble "A" note horn and bracket from Horn Kit (P/N 10456328).
6. Install and connect the horn.
7. Reinstall the oil filter and remote air cleaner, if necessary.
8. Check and add oil as required.
SERVICE PARTS INFORMATION
Part Number Description Qty
10456328 Horn Kit "A" Note 1
10456443 Horn Kit "F" Note 1
Parts are currently available from GMSPO.
WARRANTY INFORMATION
For vehicles repaired under warranty, use: