Pinpoint Test B - Wipers Inoperative
WARNING: This page is about a different car, the 1997 Mercury Grand Marquis, 1997 Lincoln Town Car, and 1997 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect wiper motor connector. Set wiper control for high speed operation. Turn ignition on. Measure voltage between ground and Dark Green wire at wiper motor connector. If battery voltage exists, reconnect wiper motor connector and go to next step. If battery voltage does not exist, repair open in Dark Green wire.
- Disconnect Wiper Control Module (WCM). WCM is located behind instrument panel, to left of steering column. Measure voltage between ground and Dark Green wire at WCM wiring harness connector. If battery voltage exists, reconnect WCM connector and go to next step. If battery voltage does not exist, repair open in Dark Green wire.
- Set wiper switch for high speed operation. Measure voltage between Yellow/Red wire and White wire at wiper motor wiring harness connector. If battery voltage does not exist, go to next step. If battery voltage exists, test wiper switch. See WIPER/WASHER SWITCH under COMPONENT TESTS.
- Set wiper switch for high speed operation. Measure voltage between Yellow/Red wire and White wire at WCM wiring harness connector. If battery voltage does not exist, go to next step. If battery voltage exists, repair open in White wire or Yellow/Red wire between WCM and wiper motor.
- Turn ignition off. Measure resistance between Brown/White wire and Orange wire at WCM wiring harness connector. If resistance is less than 5 ohms, replace WCM. If resistance is 5 ohms or more, go to next step.
- Disconnect multifunction switch 7-pin connector. Measure resistance between Brown/White wire and Orange wire at multifunction switch. If resistance is less than 5 ohms, repair open in Brown/White wire or Orange wire between multifunction switch and WCM. If resistance is 5 ohms or more, replace multifunction switch.