Testing

WIPER SYSTEM
The diagnosis found here addresses an electrically inoperative front wiper system. If the front wiper motor operates, but the wipers do not move on the windshield, replace the faulty front wiper module. If the wipers operate, but chatter, lift, or do not clear the glass, clean and inspect the wiper system components as required. (Refer to FRONT WIPERS/WASHERS - INSPECTION) and (Refer to FRONT WIPERS/WASHERS - CLEANING).
Service and Repair

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 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 front wiper and washer system fuse (Fuse 14 - 25 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 the front wiper and washer system fuse (Fuse 14 - 25 ampere) in the fuse block.
If OK, go to Step 3.
If not OK, repair the open fused ignition switch output (run-acc) circuit between the fuse block and the ignition switch as required.

3. Disconnect and isolate the battery negative cable. Disconnect the cross body wire harness connector for the right multi-function switch from the switch connector receptacle. Check for continuity between the ground circuit cavity of the cross body wire harness connector for the right multi-function switch and a good ground. There should be continuity.
If OK, go to Step 4.
If not OK, repair the open ground circuit to ground (G300) as required.

4. 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 cross body wire harness connector for the right multi-function switch. If OK, go to Step 5. If not OK, repair the open fused ignition switch output (run-acc) circuit between the right multi-function switch and the fuse block as required.

5. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. Remove the right multi-function switch from the steering column and check the switch continuity. (Refer to FRONT WIPERS/WASHERS/RIGHT MULTI-FUNCTION SWITCH - DIAGNOSIS AND TESTING).
If OK, go to Step 6.
If not OK, replace the faulty switch.

6. Disconnect the cross body wire harness connector for the front wiper motor from the wiper motor pigtail wire connector. Check for continuity between the ground circuit cavity in the cross body wire harness connector for the front wiper motor and a good ground. There should be continuity.
If OK, go to Step 7.
If not OK, repair the open ground circuit to ground (G300) as required.

7. 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 cross body wire harness connector for the front wiper motor.
If OK, go to Step 8.
If not OK, repair the open fused ignition switch output (run-acc) circuit between the front wiper motor and the fuse block as required.

8. Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. The cross body wire harness connector for the right multi-function switch is still disconnected. Check each of the following circuits at the proper cavity of the cross body wire harness connector for the front wiper motor for continuity to ground. In each case, there should be no continuity.
If OK, go to Step 9.
If not OK, repair the shorted circuit between the front wiper motor and the right multi-function switch as required.
- Wiper park switch sense
- Wiper switch low speed output
- Wiper switch high speed output

9. Check the continuity of each of the following circuits between the proper cavities of the cross body wire harness connectors for the front wiper motor and the right multi-function switch. In each case, there should be continuity.
If OK, replace the faulty front wiper module.
If not OK, repair the open circuit between the front wiper motor and the right multifunction switch as required.
- Wiper park switch sense
- Wiper switch low speed output
- Wiper switch high speed output