Rear Wiper & Washer System Test
WIPER SYSTEMThe diagnosis found here addresses an electrically inoperative rear wiper system. If the rear wiper motor operates, but the wiper does not move on the liftgate glass, replace the faulty rear wiper module. If the wiper operates, but chatters, lifts, or does not clear the glass, clean and inspect the wiper system components as required. (Refer to REAR WIPERS/WASHERS - INSPECTION) and (Refer to WIPERS/WASHERS - CLEANING).
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG 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 22 - 20 ampere) in the Junction Block (JB). 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 22 - 20 ampere) in the JB. If OK, go to Step 3. If not OK, repair the open fused ignition switch output (run) circuit between the JB 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 (Cavity 5) 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 JB 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 (G107) as required.
5. Test the rear wiper and washer switch continuity. (Refer to 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 liftgate wire harness connector for the rear wiper module from the module 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 liftgate wire harness connector for the rear wiper module. If OK, go to Step 7. If not OK, repair the open fused ignition switch output (run) circuit between the rear wiper module and the rear wiper and washer switch 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 liftgate wire harness connector for the rear wiper module and a good ground. There should be continuity. If OK, go to Step 8. If not OK, repair the open ground circuit to ground (G304) as required.
8. Check for continuity between the rear wiper motor control circuit cavity of the liftgate wire harness connector for the rear wiper module 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 module and the rear wiper and washer switch as required.
9. Check for continuity between the rear wiper motor control circuit cavities of the liftgate wire harness connector for the rear wiper module 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 module. If not OK, repair the open rear wiper motor control circuit between the rear wiper module and the rear wiper and washer switch as required.
WASHER SYSTEM
The diagnosis found here addresses an electrically inoperative rear washer system. If the rear washer pump/motor operates, but no washer fluid is emitted from the rear washer nozzle, be certain to check the fluid level in the reservoir. Also inspect the washer system components as required. (Refer to REAR WIPERS/WASHERS - INSPECTION).
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
1. Turn the ignition switch to the ON position. Place the rear wiper and washer switch rocker in the Wipe position. Check whether the rear wiper is operating. If OK, go to Step 2. If not OK, repair the wiper system as required before you proceed with washer system diagnosis. Refer to WIPER SYSTEM.
2. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. Disconnect the headlamp and dash wire harness connector for the rear washer pump/motor from the pump/motor connector receptacle. Check for continuity between the ground circuit cavity of the headlamp and dash wire harness connector for the rear washer pump/motor and a good ground. There should be continuity. If OK, go to Step 3. If not OK, repair the open ground circuit to ground (G106) as required.
3. Reconnect the battery negative cable. Turn the ignition switch to the ON position. Check for battery voltage at the rear washer motor control circuit cavity of the headlamp and dash wire harness connector for the rear washer pump/motor while the rear wiper and washer switch rocker is actuated to the Wash position. If OK, replace the faulty rear washer pump/ motor unit. If not OK, go to Step 4.
4. 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. Disconnect the liftgate wire harness connector for the rear wiper module from the module connector receptacle. Check for continuity between the rear washer motor control circuit cavity of the headlamp and dash wire harness connector for the rear washer pump/motor and a good ground. There should be no continuity. If OK, go to Step 5. If not OK, repair the shorted rear washer motor control circuit between the rear wiper and washer switch, the rear washer pump/motor, and the rear wiper module as required.
5. Check for continuity between the rear washer motor control circuit cavities of the headlamp and dash wire harness connector for the rear washer pump/motor and the instrument panel wire harness connector for the rear wiper and washer switch. There should be continuity. If OK, go to Step 6. If not OK, repair the open rear washer motor control circuit between the rear washer pump/motor and the rear wiper and washer switch as required.
6. Check for continuity between the rear washer motor control circuit cavities of the liftgate wire harness connector for the rear wiper module 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 module. If not OK, repair the open rear washer motor control circuit between the rear wiper and washer switch and the rear wiper module as required.