General Testing

Rear Wiper System

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIRBAGS SYSTEMS BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

1. Check that the interior lighting switch on the control stalk of the left multi-function switch is not in the dome lamp disable position. Open the liftgate. The interior lamps should light. Close all four doors, the liftgate and the liftgate flip-up glass. Note whether the interior lamps remain lighted. They should turn off after about thirty seconds. If OK, go to Step 2. If not OK, go to Step 9.
2. Check the fused B(+) fuse in the junction block. If OK, go to Step 3. If not OK, repair the shorted circuit or component as required and replace the faulty fuse.
3. Check for battery voltage at the fused B(+) fuse in the junction block. If OK, go to Step 4. If not OK, repair the open fused B(+) circuit to the Power Distribution Center (PDC) fuse as required.
4. Check the fused ignition switch output (run/accessory) fuse in the junction block. If OK, go to Step 5. If not OK, repair the shorted circuit or component as required and replace the faulty fuse.
5. Turn the ignition switch to the On position. Check for battery voltage at the fused ignition switch output (run/accessory) fuse in the junction block. If OK, turn the ignition switch to the Off position and go to Step 6. If not OK, repair the open fused ignition switch output (run/accessory) circuit to the ignition switch as required.
6. Disconnect and isolate the battery negative cable. Disconnect the instrument panel wire harness connector from the wiper and washer (right multi- function) switch connector receptacle. Reconnect the battery negative cable. Turn the ignition switch to the On position. Check for battery voltage at the fused ignition switch output (run/accessory) circuit cavity of the instrument panel wire harness connector for the wiper and washer switch. If OK, go to Step 7. If not OK, repair the open fused ignition switch output (run/accessory) circuit to the junction block fuse as required.
7. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Refer to Wiper and Washer switch Diagnosis. If the wiper and washer switch tests OK, reconnect the instrument panel wire harness connector to the wiper and washer switch connector receptacle and go to Step 8. If the wiper and washer switch does not test OK, replace the faulty wiper and washer switch.
8. Remove the liftgate inner trim panel. Disconnect the liftgate wire harness connector from the rear wiper motor module connector receptacle. Check for continuity between the ground circuit cavity of the liftgate wire harness connector for the rear wiper motor module and a good ground. There should be continuity. If OK, go to Step 9. If not OK, repair the open ground circuit to ground as required.
9. Check for continuity between the liftgate ajar switch sense circuit cavity of the liftgate wire harness connector for the rear wiper motor module and a good ground. There should be continuity with the liftgate and/or the liftgate flip-up glass open, and no continuity with the liftgate and the liftgate flip-up glass closed. If OK, go to Step 10. If not OK, repair the liftgate and/or the liftgate flip-up glass ajar circuits as required.
10. Reconnect the battery negative cable. Check for battery voltage at the fused B(+) circuit cavity of the liftgate wire harness connector for the rear wiper motor module. If OK, go to Step 11. If not OK, repair the open fused B(+) circuit to the junction block fuse as required.
11. Turn the ignition switch to the On position. Turn the rear wiper switch to the Delay position. Check for battery voltage at the rear wiper motor intermittent control circuit cavity of the liftgate wire harness connector for the rear wiper motor module. If OK, go to Step 12. If not OK, repair the open rear wiper motor intermittent control circuit to the wiper and washer switch as required.
12. Turn the rear wiper switch to the On position. Check for battery voltage at the rear wiper motor control circuit cavity of the liftgate wire harness connector for the rear wiper motor module. If OK, replace the faulty rear wiper motor module. If not OK, repair the open rear wiper motor control circuit to the wiper and washer switch as required.