Wipers Run With Switch Off
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.
- Inspect wiper motor and Wiper Control Module (WCM) connectors. WCM is located at fuse block. Repair connections as necessary and retest system. If connections are okay, go to next step.
- Unplug wiper motor. Turn wiper switch off. At harness connector, Measure resistance between Black/Pink wire and Dark Blue/Orange wire terminals, and between Yellow/Red wire and Black wire terminals. If resistance is greater than 5 ohms for either pair of wires, go to next step. If resistance is 5 ohms or less for both pairs of wires, replace wiper motor and retest system.
- Measure resistance of Black/Pink wire, Yellow/Red wire and Dark Blue/Orange wire and Black wire between wiper motor and WCM. If resistance of any wire(s) is greater than 5 ohms, repair open wire(s) as necessary. If resistance of all wires is 5 ohms or less, go to next step.
- Disconnect WCM. With wiper switch off, measure resistance between Orange wire and Brown/White wire terminals of WCM connector. If resistance is 45-50 k/ohms, replace WCM. If resistance is not as specified, go to next step.
- Disconnect wiper switch. Measure resistance between Orange wire and Brown/White wire terminals of wiper switch connector. If resistance is 45-50 k/ohms, test wiper switch. See WIPER SWITCH CONTINUITY TEST . If resistance is not as specified, check for open Orange wire or Brown/White wire between wiper switch and WCM.