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Rear Wiper & Washer System Test

REAR WIPER 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 glass, inspect the connection between the rear wiper blade and the rear wiper motor output shaft. If the rear wiper operates, but chatters, lifts, or does not clear the glass, clean and inspect the rear wiper system components as required. (Refer to REAR WIPERS/WASHERS - INSPECTION) and (Refer to REAR WIPERS/WASHERS - CLEANING). Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The following tests will help to diagnose the hard wired components and circuits of the rear wiper system. However, these tests may not prove conclusive in the diagnosis of the heater-air conditioner control or the Central Timer Module (CTM). In order to obtain conclusive testing of the heater-air conditioner control, the CTM, the Programmable Communications Interface (PCI) data bus network and all of the electronic modules that provide inputs to or receive outputs from the wiper system components must be checked. The most reliable, efficient, and accurate means to diagnose the heater-air conditioner control and the CTM requires the use of a DRB III scan tool. Refer to the appropriate diagnostic information. The DRB III scan tool can provide confirmation that the PCI data bus is functional, that all of the electronic modules are sending and receiving the proper messages on the PCI data bus, and that the rear wiper relay is being sent the proper hard wired outputs by the CTM for it to perform its rear wiper system functions.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO THE RESTRAINTS BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, SEAT BELT TENSIONER, 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 the fused B(+) fuse (Fuse J - 20 ampere) in the Power Distribution Center (PDC). If OK, go to Step 2. If not OK, repair the shorted circuit or component as required and replace the faulty fuse.
2. Check for battery current at the fused B(+) fuse (Fuse J - 20 ampere) in the PDC. If OK, go to Step 3. If not OK, repair the open B(+) circuit between the PDC and the battery as required.
3. Test the rear wiper relay and circuits. (Refer to REAR WIPERS/WASHERS/REAR WIPER RELAY - DIAGNOSIS AND TESTING). If the relay tests OK, go to Step 4. If not OK, replace the faulty relay or repair the relay circuits as required.
4. Disconnect and isolate the battery negative cable. Disconnect the wire harness connector for the rear wiper motor from the motor pigtail wire connector. Check for continuity between the ground circuit cavity of the liftgate wire harness connector for the rear wiper motor and a good ground. There should be continuity. If OK, go to Step 5. If not OK, repair the open ground circuit to ground (G306) as required.
5. Disconnect the body wire harness connector (Connector C2) for the CTM from the CTM connector receptacle. Check for continuity between the rear wiper motor control circuit cavity of the liftgate wire harness connector for the rear wiper motor and a good ground. There should be no continuity If OK, go to Step 6. If not OK, repair the shorted rear wiper motor control circuit between the rear wiper motor and the CTM as required.
6. Check for continuity between the rear wiper park switch sense circuit cavities of the liftgate wire harness connector for the rear wiper motor and the body wire harness connector (Connector C2) for the CTM. There should be continuity. If OK, replace the faulty rear wiper motor as required. If not OK, repair the open rear wiper park switch sense circuit between the rear wiper motor and the CTM as required.

REAR WASHER SYSTEM
The diagnosis found here will help to diagnose an electrically inoperative rear washer system. The following tests will help to diagnose the hard wired components and circuits of the rear washer system. However, these tests may not prove conclusive in the diagnosis of the wipe-after-wash feature, which is controlled by the heater-air conditioner control and the Central Timer Module (CTM). In order to obtain conclusive testing of the heater-air conditioner control, the CTM, the Programmable Communications Interface (PCI) data bus network and all of the electronic modules that provide inputs to or receive outputs from the rear washer system components must be checked. The most reliable, efficient, and accurate means to diagnose the heater-air conditioner control and the CTM requires the use of a DRB III scan tool. Refer to the appropriate diagnostic information. If the washer pump/motor operates, but no washer fluid is emitted from the washer nozzles, be certain to check the fluid level in the reservoir. Also inspect the washer system components as required. (Refer to REAR WIPER/WASHERS - INSPECTION). Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, SEAT BELT TENSIONER, 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. Rotate the rear wiper and washer switch control knob to the ON 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 REAR WIPER SYSTEM.
2. Turn the ignition switch to the OFF position. Check the fused ignition switch output (RUN) fuse (Fuse 25 - 10 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. Turn the ignition switch to the ON position. Check for battery current at the fused ignition switch output (RUN) fuse (Fuse 25 - 10 ampere) in the JB. If OK, go to Step 4. If not OK, repair the open fused ignition switch output (RUN) circuit between the JB and the ignition switch as required.
4. 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 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 5. If not OK, repair the open ground circuit to ground (G112) as required.
5. Reconnect the battery negative cable. Turn the ignition switch to the ON position. Check for battery current at the rear washer pump/motor control circuit cavity of the headlamp and dash wire harness connector for the rear washer pump/motor while the rear washer switch is depressed. If OK, replace the faulty rear washer pump/motor. If not OK, go to Step 6.
6. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. Disconnect the instrument panel wire harness connector (Connector C2) for the heater-air conditioner control from the control connector receptacle. Reconnect the battery negative cable. Turn the ignition switch to the ON position. Check for battery current at the fused ignition switch output (RUN) circuit cavity of the instrument panel wire harness connector (Connector C2) for the heater-air conditioner control. If OK, go to Step 7. If not OK, repair the open fused ignition switch output (run) circuit between the heater-air conditioner control and the JB as required.
7. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. Disconnect the instrument panel wire harness connector (Connector C1) for the heater-air conditioner control from the control connector receptacle. Check for continuity between the rear washer pump/motor control circuit cavity of the instrument panel wire harness connector (Connector C1) for the heater-air conditioner control and a good ground. There should be no continuity. If OK, go to Step 8. If not OK, repair the shorted rear washer pump/motor control circuit between the heater-air conditioner control and the rear washer pump/motor as required.
8. Check for continuity between the rear washer pump/motor control circuit cavities of the instrument panel wire harness connector (Connector C1) for the heater-air conditioner control and the headlamp and dash wire harness connector for the rear washer pump/motor. There should be continuity If OK, replace the faulty heater-air conditioner control. If not OK, repair the open rear washer pump/motor control circuit between the heater-air conditioner control and the rear washer pump/motor as required.
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