Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1993ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSINSTRUMENTS - IRREGULAR CLUSTER DISPLAY
1993 Chevrolet Astro Van M V6-262 4.3L VIN Z
Instruments - Irregular Cluster Display
1993 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION Instruments - Irregular Cluster Display
Group Ref.: Chassis/Body Electrical
Bulletin No.: 968101
Date: April, 1994
SUBJECT:
IRREGULAR ELECTRONIC INSTRUMENT CLUSTER DISPLAY/FALSE TEMP INDICATION WHEN HORN IS ACTIVATED (REPLACE HORN ASSEMBLIES)
MODELS:
1989-94 CHEVROLET AND GMC TRUCK MIL VANS WITH ELECTRONIC INSTRUMENT CLUSTER (RPO U52)
THIS BULLETIN IS BEING REVISED TO ADD 1990-94 MODEL YEARS AND TO UPDATE SERVICE PARTS INFORMATION.
PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE:
DIVISION BULLETIN NUMBER
CHEVROLET 89-144-8C
GMC TRUCK 89-T-53
GM CANADA 89-8-149
CONDITION:
An irregular electronic instrument cluster display condition can sporadically occur when the horns are activated. When this occurs, the temperature gauge goes full scale (hot) and returns to normal operation after approximately two seconds, or the electronic cluster display will dim and remain dim until the ignition key is turned off.
CAUSE:
Unsuppressed electrical surges from the horn circuit.
CORRECTION:
New horn assemblies will be released incorporating a surge suppression capacitor.
If this condition is encountered, it can be repaired by installing the assemblies listed below.
REMOVAL AND REPLACEMENT PROCEDURE:
(Refer to Figure 1.)
1. Note radio pre-set stations.
2. Disconnect the battery ground cable from the battery.
3. Disconnect the horn lead connectors from each horn assembly.
4. Remove the horn retaining screws.
5. Remove and discard the horn assemblies.
6. Install new horn assemblies P/N 10456444-RH "A" note and P/N 10456443-LH "F" note using retaining screws previously removed. Torque screws to 14-20 N-m (10.32-14.75 lbs.ft.).
7. Reconnect the horn lead connectors to the horns.
8. Reconnect the battery ground cable to the battery.
9. Re-program radio to pre-set stations and set time where required.
SERVICE PARTS INFORMATION:
Parts are currently available from GMSPO.
WARRANTY INFORMATION:
For vehicles repaired under warranty, use:
Bulletin No.: 968101
Date: April, 1994
SUBJECT:
IRREGULAR ELECTRONIC INSTRUMENT CLUSTER DISPLAY/FALSE TEMP INDICATION WHEN HORN IS ACTIVATED (REPLACE HORN ASSEMBLIES)
MODELS:
1989-94 CHEVROLET AND GMC TRUCK MIL VANS WITH ELECTRONIC INSTRUMENT CLUSTER (RPO U52)
THIS BULLETIN IS BEING REVISED TO ADD 1990-94 MODEL YEARS AND TO UPDATE SERVICE PARTS INFORMATION.
PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE:
DIVISION BULLETIN NUMBER
CHEVROLET 89-144-8C
GMC TRUCK 89-T-53
GM CANADA 89-8-149
CONDITION:
An irregular electronic instrument cluster display condition can sporadically occur when the horns are activated. When this occurs, the temperature gauge goes full scale (hot) and returns to normal operation after approximately two seconds, or the electronic cluster display will dim and remain dim until the ignition key is turned off.
CAUSE:
Unsuppressed electrical surges from the horn circuit.
CORRECTION:
New horn assemblies will be released incorporating a surge suppression capacitor.
If this condition is encountered, it can be repaired by installing the assemblies listed below.
REMOVAL AND REPLACEMENT PROCEDURE:
(Refer to Figure 1.)
1. Note radio pre-set stations.
2. Disconnect the battery ground cable from the battery.
3. Disconnect the horn lead connectors from each horn assembly.
4. Remove the horn retaining screws.
5. Remove and discard the horn assemblies.
6. Install new horn assemblies P/N 10456444-RH "A" note and P/N 10456443-LH "F" note using retaining screws previously removed. Torque screws to 14-20 N-m (10.32-14.75 lbs.ft.).
7. Reconnect the horn lead connectors to the horns.
8. Reconnect the battery ground cable to the battery.
9. Re-program radio to pre-set stations and set time where required.
SERVICE PARTS INFORMATION:
Parts are currently available from GMSPO.
WARRANTY INFORMATION:
For vehicles repaired under warranty, use:
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.