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If the problem being diagnosed involves only the pulse wipe or wipe-after-wash modes, see the Washer System diagnosis.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE ATTEMPTING STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

1. Remove the circuit breaker from the junction block and turn the ignition switch to the Accessory or On position. Measure the voltage at the battery side of the circuit breaker. The meter should read battery voltage. If OK, reinstall the circuit breaker and go to Step 2. If not OK, repair the circuit from the ignition switch as required.
2. Measure the voltage at the wiper system side of the circuit breaker. The meter should read battery voltage. If OK, go to Step 3. If not OK, replace the faulty circuit breaker.
3. Unplug the multi-function switch wire harness connector. Turn the ignition switch to the Accessory or On position. Measure the voltage at the fused ignition switch output (F86) circuit cavity of the multi-function switch wire harness connector. The meter should read battery voltage. If OK, go to Step 4. If not OK, repair the open circuit as required.
4. If the problem being diagnosed involves only the intermittent wipe feature, go to Step 5. If the problem being diagnosed involves all wiper modes, or only the Low and/or High speed modes, go to Step 7.
5. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Unplug the white 24-way Body Control Module (BCM) wire harness connector. Check for continuity between the wiper switch mode sense cavities of the multi-function switch wire harness connector and the BCM white 24-way wire harness connector. There should be continuity. If OK, go to Step 6. If not OK, repair the open circuit as required.
6. Unplug the black 24-way BCM wire harness connector. Check for continuity between the windshield wiper switch signal cavities of the multi-function switch wire harness connector and the BCM black 24-way wire harness connector. There should be continuity If OK, see the Intermittent Wipe Relay diagnosis. If not OK, repair the open circuit as required.
7. Turn the ignition switch to the Off position. Check for continuity between the two wiper switch low speed output circuit cavities of the multi-function switch wire harness connector. There should be continuity. If OK, go to Step 8. If not OK, repair the open circuit as required.
8. Test the multi-function switch, as described. If the switch tests OK, plug in the switch wire harness connector and go to Step 9. If not OK, replace the faulty switch and test the wiper system operation. If still not OK, go to Step 9.
9. Measure the resistance between the ground circuit cavity of the wiper motor wire harness connector and a good ground. The meter should read zero ohms. If OK, go to Step 10. If not OK, repair the circuit to ground as required.
10. Turn the ignition switch to the Accessory or On position. Place the multi-function switch in the positions indicated in the tests below, and check for voltage at the wiper motor wire harness connector.
a. Measure the voltage at the fused ignition switch output circuit cavity of the wiper motor wire harness connector with the wiper switch in any position. The meter should read battery voltage. If OK, go to Step 2. If not OK, repair the open circuit as required.
b. Measure the voltage at the wiper switch low speed output circuit cavity of the wiper motor wire harness connector with the wiper switch in the Low position. The meter should read battery voltage. If OK, go to Step 3. If not OK, repair the open circuit as required.
c. Measure the voltage at the wiper switch high speed output circuit cavity of the wiper motor wire harness connector with the wiper switch in the High position. The meter should read battery voltage. If OK, go to Step 4. If not OK, repair the open circuit as required.
d. Measure the voltage at the wiper park switch sense circuit cavity of the wiper motor wire harness connector with the wiper switch in the Low or High position, then move the switch to the Off position. The meter should switch between battery voltage and zero Volts while the wipers are cycling. The meter should read battery voltage when the switch is moved to the Off position until the wipers park, and then read a steady zero Volts. If not OK, replace the faulty wiper motor.