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Test 28A - Inoperative Wiper Motor Low Speed

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Disconnect windshield wiper motor connector. Connector is located on engine compartment firewall, just right of power brake booster. Connect jumper wire between fused battery circuit (Red/Dark Blue wire) on on/off relay connector and low speed output circuit (Brown/White wire) on high/low relay connector and go to next step.
  2. With DRB-II in voltmeter mode, check voltage on wiper motor connector low speed output circuit (Brown/White wire). If voltage is less than 10 volts, repair open circuit in Brown/White wire between high/low speed relay and wiper motor. Perform VERIFICATION PROCEDURE VER-1.
  3. If voltage is more than 10 volts, use DRB-II in ohmmeter mode to check resistance on wiper motor connector ground circuit (Black wire). If resistance is more than ohms, repair open circuit in Black wire. Perform VERIFICATION PROCEDURE VER-1. If resistance is less than 5 ohms, replace windshield wiper motor. Perform VERIFICATION PROCEDURE VER-1.
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