Rear Wiper Switch Test

The rear windshield wiper/washer switch may be tested in the vehicle or out of the vehicle, on the bench.

In-vehicle Testing
1. Remove the switch from the instrument panel but leave the switch connected, refer to Instrument Panel Systems, Accessory Switch Bezel Removal and Installation.
2. Turn the ignition switch ON.

Fig.2 Rear Windshield Wiper/Washer Switch Harness Connector:

3. Using a voltmeter, check for battery voltage at Pin 1 and 2 .
a. If OK, go to Step 4.
b. If NOT OK, check wiper fuse in the fuse block and the 40 Amp cartridge fuse in the Power Distribution Center (PDC). If fuses are OK, check wiring circuit. Refer to Wiring Diagrams.

4. Check Pin 5, with switch in the ON position there should be battery voltage and no voltage in the OFF position.
a. If NOT OK, no voltage in the ON position or voltage in the OFF position. Replace the switch.

Bench Testing
1. First remove switch. Refer to Instrument Panel Systems, Accessory Switch Bezel Removal and Installation.

Fig. 24 Rear Wiper Switch Connector:

2. With switch removed from vehicle, use a jumper wire and connect a 12 volt supply to Pin 1 and 2. Using a third jumper wire, ground Pin 3.
3. Follow the same procedures used for IN-VEHICLE TESTING, except for step Step 2.