Defogger/Wiper Switches - Hot to the Touch

91chevy19

Number: 91-373-8D

Section: 8D

Date: JULY 1991

Corporate Bulletin No.: 168101


Subject: REAR WINDOW DEFOGGER AND/OR WIPER SWITCHES BECOME HOT TO TOUCH


Model and Year: 1991 S/T TRUCKS


Some owners of 1991 S/T utility models may comment on a condition where the rear window defogger switch and/or the rear window wiper switch is hot to the touch after the dash lights have been on for a period of time. This condition was corrected in production through the introduction of new switch assemblies which have bulbs that operate at lower temperatures. Vehicles built after the VIN breakpoints listed below have been built with the latest design switches.

Plant
Pontiac West M0198875
Moraine M2272059
Shreveport M8257710

If this condition occurs, a new rear window defogger switch and/or rear window wiper switch should be installed to replace the affected part.

SERVICE PROCEDURE:

1. Disconnect negative battery cable.

2. Remove trim plate retaining screw.

3. Remove trim plate.

4. Disconnect wiper/defogger switch connector(s).

5. Remove switch(s) from trim plate.

6. Install new switch(s).

7. Reconnect wiring connector(s).

8. Reinstall trim plate in dash.

9. Reinstall retaining screw.

10. Reconnect negative battery cable.


SERVICE PARTS INFORMATION

Part Number Description Quantity

15679578 Rear window defogger switch 1
15679579 Rear window wiper switch 1

Parts are currently available from GMSPO.


WARRANTY INFORMATION

For vehicles repaired under warranty use:

Labor
Operation Description

R2110 Switch rear defogger, replace
N2611 Switch rear wiper, replace