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Test C: Wipers Inoperative At Low Speed

WARNING: This page is about a different car, the 1997 Lincoln Continental. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Set wiper switch for high speed operation. Disconnect wiper motor connector. Check for battery voltage between Yellow/Red and Dark Blue/Orange wires at connector. If battery voltage does not exist, go to TEST B  . If battery voltage exists, go to next step.
  2. Turn ignition on. Set wiper switch for low speed operation. Disconnect wiper motor connector. Check for battery voltage between Yellow/Red and Dark Blue/Orange wires at connector. If battery voltage does not exist, go to next step. If battery voltage exists, replace wiper motor and retest system.
  3. Set wiper switch for low speed operation. Ensure Wiper Control Module (WCM) connector is properly connected. Measure voltage at WCM connector Yellow/Red wire terminal. If battery voltage does not exist, go to next step. If battery voltage exists, repair Yellow/Red wire as necessary and retest system.
  4. Set wiper switch for low speed operation. Ensure Wiper Control Module connector is properly connected. Measure voltage at WCM connector Dark Blue/Orange wire terminal. If battery voltage does not exist, go to next step. If battery voltage exists, repair Dark Blue/Orange wire as necessary and retest system.
  5. Disconnect connector from WCM. Set wiper switch to low speed. Measure resistance between Brown/White and Orange wires at WCM harness connector. If resistance is not 3500-4500 ohms, go to next step. If resistance is 3500-4500 ohms, replace WCM and retest system.
  6. Disconnect multifunction switch 7-pin connector. Set wiper switch for high speed operation. Check resistance of Brown/White wire between ground and multifunction switch 7-pin connector. If resistance is greater than 5 ohms, go to next step. If resistance is 5 ohms or less, repair Brown/White wire between WCM and wiper switch.
  7. Disconnect multifunction switch 7-pin connector. Set wiper switch for low speed operation. Check resistance of Orange wire between ground and multifunction switch 7-pin connector. If resistance is greater than 5 ohms, go to next step. If resistance is 5 ohms or less, repair Orange wire between WCM and wiper switch.
  8. Disconnect multifunction switch 7-pin connector. Set wiper switch for low speed operation. Check resistance between Orange wire terminal and Brown/White wire terminal of multifunction switch 7-pin connector. If resistance is 3500-4500 ohms, repair open in Orange wire and/or Brown/White wire. After repair, retest system.
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