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Windshield Wiper Motor Test

  1. Disconnect wiper motor harness connector in engine compartment. Using jumper wires, connect battery voltage to wiper motor connector pin No. 3 and ground connector pin No. 6. See Fig 1 .
  2. To test wiper low speed, connect another jumper wire from battery voltage to connector pin No. 2. To test high speed, reconnect jumper wire between pins No. 2 and 4. To test intermittent operation, reconnect jumper wire from pin No. 2 to pin No. 5.
Fig 1: Identifying Wiper Motor Connector Terminals
G90B09973Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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