Front Wiper & Washer System Test

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 ELECTRICAL/FRONT WIPERS/WASHERS - INSPECTION) and (Refer to ELECTRICAL/FRONT 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.

The hard wired circuits and components of the front wiper and washer system may be diagnosed and tested using conventional diagnostic tools and procedures. However, conventional diagnostic methods may not prove conclusive in the diagnosis of the Body Control Module (BCM), the Rain Sensor Module (RSM), the Powertrain Control Module (PCM) or the inputs to or outputs from these modules that control the various front wiper and washer system operating modes. The most reliable, efficient, and accurate means to diagnose the BCM, the RSM, the PCM or the BCM inputs and outputs related to the various front wiper and washer system operating modes requires the use of a DRB III scan tool. Refer to the appropriate diagnostic information.

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.

FRONT WASHER SYSTEM
The diagnosis found here addresses an electrically inoperative washer system. If the washer pump/motor operates, but no washer fluid is emitted from the front washer nozzles, be certain to check the fluid level in the reservoir. Also inspect the front washer system components as required. (Refer to ELECTRICAL/FRONT 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 control knob on the control stalk of the right (wiper) multi-function switch to the Low or High wiper position. Check whether the front wiper system is operating. If OK, go to Step 2. If not OK, test and repair the front wiper system before continuing with these tests. Refer to FRONT WIPER SYSTEM
2. Turn the control knob on the control stalk of the right (wiper) multi-function switch to the OFF position. Pull the control stalk of the right (wiper) multi-function switch toward the steering wheel to close the front washer switch. The front washer pump should operate and the front wipers should operate for about three sweep cycles after the switch is released before they park. If the front wipers are OK, but the front washers are not, go to Step 3. If the front washers are OK, but the front wipers are not, go to Step 5.
3. 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 front washer pump/motor from the pump/motor connector receptacle. Check for continuity between the ground circuit cavity of the left headlamp and dash wire harness connector for the front washer pump/motor and a good ground. There should be continuity If OK, go to Step 4. If not OK, repair the open ground circuit to ground (G106) as required.
4. Reconnect the battery negative cable. Turn the ignition switch to the ON position. While pulling the control stalk of the right (wiper) multi-function switch toward the steering wheel to close the front washer switch, check for battery voltage at the washer pump switch sense circuit cavity of the left headlamp and dash wire harness connector for the front washer pump/motor unit. If OK, replace the faulty front washer pump/motor. If not OK, repair the open washer pump switch sense circuit between the right (wiper) multi-function switch and the front washer pump/motor unit as required.
5. 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 Body Control Module (BCM) from the BCM connector receptacle. Reconnect the battery negative cable. Turn the ignition switch to the ON position. While pulling the control stalk of the right (wiper) multi-function switch toward the steering wheel to close the front washer switch, check for battery voltage at the washer pump switch sense circuit cavity of the instrument panel wire harness connector (Connector C2) for the BCM. If OK, use a DRB III scan tool to diagnose the BCM. Refer to the appropriate diagnostic information. If not OK, repair the open washer pump switch sense circuit between the right (wiper) multi-function switch and the BCM as required.