Testing

The diagnosis found here addresses an electrically inoperative rear wiper system. If the rear wiper motor operates, but the wiper does not move on the liftglass, inspect the mechanical connection between the rear wiper arm and the rear wiper motor output shaft. If OK, replace the faulty rear wiper motor. If the wiper operates, but chatters, lifts, or does not clear the glass, clean and inspect the rear wiper system components as required. (Refer to ELECTRICAL/REAR WIPERS/WASHERS - INSPECTION) and (Refer to ELECTRICAL/REAR WIPERS/WASHERS - CLEANING). Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, DRIVER AIRBAG, PASSENGER AIRBAG, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

1. Check the rear wiper and washer fuse (Fuse 6 - 20 ampere) in the fuse block. If OK, go to Step 2. If not OK, repair the shorted circuit or component as required and replace the faulty fuse.
2. Turn the ignition switch to the On position. Check for battery voltage at rear wiper and washer fuse (Fuse 6 - 20 ampere) in the fuse block. If OK, go to Step 3. If not OK, repair the open fused ignition switch output (run) circuit between the fuse block and the ignition switch as required.
3. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the instrument panel wire harness connector for the rear wiper and washer switch from the 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) circuit cavity of the instrument panel wire harness connector for the rear wiper and washer switch. If OK, go to Step 4. If not OK, repair the open fused ignition switch output (run) circuit between the rear wiper and washer switch and the fuse block as required.
4. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Check for continuity between the ground circuit cavity of the instrument panel wire harness connector for the rear wiper and washer switch and a good ground. There should be continuity. If OK, go to Step 5. If not OK, repair the open ground circuit to ground (G200) as required.
5. Test the rear wiper and washer switch continuity (Refer to ELECTRICAL/REAR WIPERS/WASHERS/REAR WIPER/WASHER SWITCH - DIAGNOSIS AND TESTING). If OK, go to Step 6. If not OK, replace the faulty rear wiper and washer switch.
6. Disconnect the hardtop wire harness connector for the rear wiper motor from the motor pigtail wire connector. Reconnect the battery negative cable. Turn the ignition switch to the On position. Check for battery voltage at the fused ignition switch output (run) circuit cavity of the hardtop wire harness connector for the rear wiper motor. If OK, go to Step 7. If not OK, repair the open fused ignition switch output (run) circuit between the rear wiper motor and the fuse block as required.
7. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Check for continuity between the ground circuit cavity of the hardtop wire harness connector for the rear wiper motor and a good ground. There should be continuity. If OK, go to Step 8. If not OK, repair the open ground circuit to ground (G302) as required.
8. Check for continuity between the rear wiper motor control circuit cavity of the hardtop wire harness connector for the rear wiper motor and a good ground. There should be no continuity. If OK, go to Step 9. If not OK, repair the shorted rear wiper motor control circuit between the rear wiper motor and the rear wiper and washer switch as required.
9. Check for continuity between the rear wiper motor control circuit cavities of the hardtop wire harness connector for the rear wiper motor and the instrument panel wire harness connector for the rear wiper and washer switch. There should be continuity. If OK, replace the faulty rear wiper motor. If not OK, repair the open rear wiper motor control circuit between the rear wiper motor and the rear wiper and washer switch as required.