Rear Wiper & Washer System
DIAGNOSIS AND TESTING - REAR WIPER & WASHER SYSTEMWIPER SYSTEM
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 liftgate flip-up glass, inspect the mechanical connection between the rear wiper arm and the rear wiper motor output shaft. If OK, replace the faulty rear wiper module. 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 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, SIDE CURTAIN AIRBAG, FRONT IMPACT SENSOR, SIDE IMPACT SENSOR, 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 that the interior lighting switch on the control stalk of the left (lighting) multi-function switch is not in the dome lamp disable position. With all four doors and the liftgate closed, open the lift- gate flip-up glass. The interior lamps should light. If not, depress the cargo lamp lens to actuate the cargo lamp defeat switch and 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 30 seconds. If OK, go to Step 2. If not OK, go to Step 9.
2. Check the fused B(+) fuse (Fuse 8 - 15 ampere) in the Junction Block (JB). 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 (Fuse 8 - 15 ampere) in the JB. If OK, go to Step 4. If not OK, repair the open fused B(+) circuit between the JB and the Power Distribution Center (PDC) as required.
4. Check the fused ignition switch output (RUN/ACC) fuse (Fuse 29 - 10 ampere) in the JB. 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/ACC) fuse (Fuse 29 - 10 ampere) in the JB. 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-acc) circuit between the JB and the ignition switch as required.
6. Disconnect and isolate the battery negative cable. Disconnect the instrument panel wire harness connector for the right multi-function 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/ACC) circuit cavity of the instrument panel wire harness connector for the right multi-function switch. If OK, go to Step 7. If not OK, repair the open fused ignition switch output (RUN/ACC) circuit between the right multi-function switch and the JB as required.
7. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Test the right multi-function switch. If the right multi-function switch tests OK, reconnect the instrument panel wire harness connector for the right multi-function switch to the switch connector receptacle and go to Step 8. If the right multi-function switch does not test OK, replace the faulty switch.
8. Remove the liftgate inner trim panel. Disconnect the liftgate wire harness connector for the rear wiper module from the module connector receptacle. 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 9. If not OK, repair the open ground circuit to ground (G301) as required.
9. Check for continuity between the liftgate flip-up glass ajar switch sense circuit cavity of the liftgate wire harness connector for the rear wiper module and a good ground. There should be continuity with the liftgate flip-up glass open, and no continuity with the liftgate flip-up glass closed. If OK, go to Step 10. If not OK, repair the liftgate flip-up glass ajar circuit 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 module. If OK, go to Step 11. If not OK, repair the open fused B(+) circuit between the rear wiper module and the JB as required.
11. Turn the ignition switch to the On position. Turn the right multi-function switch control sleeve to the Delay position. Check for battery voltage at the rear washer switch output circuit cavity of the lift- gate wire harness connector for the rear wiper module. If OK, go to Step 12. If not OK, repair the open rear washer switch output circuit between the rear wiper module and the right multi-function switch as required.
12. Turn the right multi-function switch control sleeve 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 module. 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 right multi-function 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 rear washer system components as required. (Refer to ELECTRICAL/REAR WIPERS/WASHERS - INSPECTION). 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, SIDE CURTAIN AIRBAG, FRONT IMPACT SENSOR, SIDE IMPACT SENSOR, 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. Turn the ignition switch to the On position. Turn the right multi-function switch control sleeve to the On position. Check whether the rear wiper system is operating. If OK, go to Step 2. If not OK, test and repair the rear wiper system before continuing with these tests. Refer to WIPER SYSTEM.
2. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the left headlamp and dash wire harness connector for the rear washer pump/motor unit from the pump/motor unit connector receptacle. Check for continuity between the ground circuit cavity of the left headlamp and dash wire harness connector for the rear washer pump/motor unit 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. Push the right multi-function switch control stalk toward the instrument panel to actuate the rear washer switch. With the rear washer switch actuated, check for battery voltage at the rear washer switch output circuit cavity of the left headlamp and dash wire harness connector for the rear washer pump/motor unit. If OK, replace the faulty rear washer pump/motor unit. If not OK, repair the open rear washer switch output circuit between the rear washer pump/motor unit and the right multi-function switch as required.