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Test 24B - Diagnosing Wiper Park Switch

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. Perform TEST VER - 1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Turn ignition off. Using DRB-II in voltmeter mode, backprobe park switch sense circuit at wiper motor connector (Dark Green wire). Turn ignition on and wiper switch to LO position.
  2. If voltage does not pulsate during wiper operation, go to step 5). If voltage pulsates during wiper operation, turn ignition off. Disconnect wiper motor connector.
  3. Disconnect Blue body controller connector. Body controller is located under left side of instrument panel. Using an external ohmmeter, measure resistance of park switch sense circuit (Dark Green wire) between Blue body controller terminal No. 20 and wiper motor connector Dark Green wire.
  4. If resistance is more than 5 ohms, repair open Dark Green wire. If resistance is less than 5 ohms, replace body controller.
  5. Turn wiper switch off. Disconnect wiper motor connector. Turn ignition on. Using DRB-II in voltmeter mode, probe fused ignition feed circuit at wiper motor connector (Dark Blue wire). If voltage is less than 10 volts, repair open Dark Blue wire. If voltage is more than 10 volts, replace wiper motor.
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