Wipers Inoperative At High Speed
WARNING: This page is about a different car, the 1997 Mercury Cougar and 1997 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition on. Set wiper switch for low-speed operation. If wipers do not operate at low speed, go to next step. If wipers operate at low speed, see WINDSHIELD WIPERS INOPERATIVE .
- Turn ignition on. Set wiper switch for high-speed operation. Disconnect wiper motor connector. Check for battery voltage between White and Black wires at wiper motor harness connector. If battery voltage exists, replace wiper motor. If battery voltage does not exist, go to next step.
- Check for battery voltage between White and Black wire terminals at ICM 12-pin connector. If battery voltage does not exist, go to next step. If battery voltage exists, repair open White wire and retest system.
- Disconnect ICM 12-pin connector. Set wiper switch for high speed operation. Measure resistance between Brown/White wire and Orange wire terminals of ICM 12-pin connector. If resistance is greater than one ohm, go to next step. If resistance is less than one ohm, replace ICM and retest system.
- Disconnect wiper switch harness connector. Set wiper switch for high speed operation. Measure resistance between connector terminals No. 1 and 4. See Figure . If resistance is greater than one ohm, replace wiper switch and retest system. If resistance is less than one ohm, go to next step.
- Disconnect ICM 12-pin connector. Disconnect wiper switch connector. Measure resistance between Brown/White wire terminal and Orange wire terminal of ICM connector. Measure resistance of Orange wire between ICM 12-pin connector and wiper switch connector. If resistance is greater than 3 ohms on either circuit, repair wire(s) as required. If resistance is less than 3 ohms on both circuits, replace wiper motor. Retest system after repairs.