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Wipers Inoperative At Interval Setting

WARNING: This page is about a different car, the 1995 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
  1. Unplug connector from WCM, located at fuse block. Measure resistance between Brown/White wire and Orange wire terminals of harness connector. See Figure . If resistance is 10,500-12,000 ohms, go to step 3). If resistance is not 10,500-12,000 ohms, go to next step.
  2. Unplug connector from wiper switch. Measure resistance between Brown/White wire and Orange wire terminals of switch. If resistance is 10,500-12,000 ohms, repair open wire between WCM and wiper switch. If resistance is not 10,500-12,000 ohms, test wiper switch. See WIPER SWITCH TEST  . Replace wiper switch if necessary.
  3. Measure resistance between Brown/White wire and Dark Blue/White wire terminals of windshield wiper switch while rotating interval control. If resistance is 103.3 k/ohms, go to next step. If resistance is less than 103.3 k/ohms, replace WCM.
  4. Unplug connector from windshield wiper switch. Measure resistance between Brown/White wire and Dark Blue/White wire terminals of switch while rotating interval control. If resistance is less than 103.3 k/ohms, repair open wiring between wiper switch and WCM. If resistance is at least 103.3 ohms, test wiper switch. Refer to, in this article, WIPER SWITCH TEST  . Replace switch if necessary and retest system.
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