Wipers Inoperative At High Speed
WARNING: This page is about a different car, the 1997 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
- Unplug wiper motor connector. Set wiper switch to high speed. Turn ignition on. Check voltage at Dark Green wire terminal of wiper motor harness connector. If battery voltage exists, go to next step. If battery voltage does not exist, go to step 3).
- Unplug Wiper Control Module (WCM) harness connector. See Fig 1 . WCM is located at fuse block. Check voltage at Dark Green wire terminal of WCM connector. If 10 volts or more exist, reconnect WCM connector and go to next step. If less than 10 volts exist, repair open Dark Green wire to WCM and retest system.
- Measure voltage at supply and output sides of fuse No. 2 (30-amp) located at fuse junction panel. If battery voltage exists at both sides of fuse, repair open Dark Green wire to WCM. If battery voltage does not exist at both sides of fuse, replace fuse No. 2 and retest system.
- Turn ignition on. Set wiper switch for high speed operation. Unplug wiper motor harness connector. Check voltage between Yellow/Red wire and White wire terminals of wiper motor harness connector. If battery voltage does not exist, go to next step. If battery voltage exists, go to step 8).
- Check voltage between Yellow/Red wire and White wire terminals of WCM connector. If battery voltage does not exist, go to next step. If battery voltage exists, repair open White wire or Yellow/Red wire between WCM and wiper motor.
- Unplug connector from WCM. Set wiper switch for high speed operation. Measure resistance between Brown/White wire and Orange wire terminals of harness connector. If resistance is less than 5 ohms, replace WCM. If resistance is 5 ohms or greater, go to next step.
- Unplug wiper switch connector. Set wiper switch for high speed operation. Measure resistance between Orange and Brown/White wires at wiper switch harness connector. If resistance is less than one ohm, repair open Brown/White wire or Orange wire(s) between wiper switch and WCM. If resistance is greater than one ohm, replace wiper switch and retest system.
- Test wiper switch. See WIPER SWITCH CONTINUITY TEST . If switch is okay, perform WIPER MOTOR CURRENT TEST. If current is okay, repair binding linkage. Replace motor if current is not as specified.