Instrument Panel - Blank Speedometer, Reads 188 MPH
Number: 93-212-8CSection: 8C
Date: MAY 1993
Corporate Bulletin No.: 368301
ASE No.: A6
Subject:
DIGITAL INSTRUMENT PANEL CLUSTER GOES BLANK OR SPEEDOMETER READS 188 WHEN HORN IS DEPRESSED
Model and Year:
1993 S/T TRUCKS WITH 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 P0145373
Moraine P2159574
Shreveport P8179203
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.
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:
Parts are currently available from GMSPO.
WARRANTY INFORMATION:
For vehicles repaired under warranty, use: