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Wipers Inoperative

  1. Unplug wiper motor connectors. Set wiper control for high speed operation. Turn ignition on. Check voltage at Dark Green wire terminal of harness connector. If battery voltage exists, go to next step. If battery voltage does not exist, check for open wiring, defective circuit breaker, or defective switch. See WIPER SWITCH TEST  .
  2. Check voltage at Dark Green wire of WCM harness connector. WCM connector is located behind instrument panel, to left of steering column. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Dark Green wire to WCM.
  3. Set wiper switch for high speed operation. 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, test wiper switch. See WIPER SWITCH TEST  .
  4. 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.
  5. Unplug connector from WCM. Measure resistance between Brown/White wire and Orange wire terminals of harness connector. If resistance is less than one ohm, replace WCM. If resistance is not less than one ohm, go to next step.
  6. Check for open Brown/White wire or Orange wire between wiper switch and WCM. If wires are okay, test wiper switch. Refer to WIPER SWITCH 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.
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