Wiper and Washer Systems: Testing and Inspection

Workshop Hints

Windshield Wiper Blade Service
To access the wiper blades for cleaning or replacement, the following is required:
- With the ignition switched on (KL15), switch the wiper stalk to the "Intermittant" wipe mode.
- Switch the ignition off when the wiper arms are in the "upright" position.


CAUTION: Do not allow the wiper arm to spring back against the windshield, glass breakage will occur!


Rain Sensor Equipped Vehicles
Make sure the wiper blades are in perfect condition. Only use window cleaner to clean the windows. Dirty windows can cause the Rain Sensor control module to set a fault due to the end limits of its adaptation abilities.

Rear Window/Wiper
The wiper arm and driveshaft are connected by splines.




Special tool #61 1 320 is required to hold the drive shaft in the park position prior to installing the wiper arm on to the drive shaft.

Windshield Wiper System Diagnosis
The GM monitors the following circuits:
- Wiper Potentiometer
- Wiper Motor
- Terminal 30
- Double Relay
- Windshield Washer Pump


NOTE: The wiper/washer operation will be interrupted during engine cranking. The GM provides this "unload" feature to preserve the battery voltage for the starter motor.