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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System And Washer System >> Diagnostic Information and Procedures >> Windshield Wiper Washer System Malfunction >> Circuit Testing >> Wipers Inoperative All Modes
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Wipers Inoperative All Modes

  1. Install a scan tool and display the Wiper Delay Input parameter in the BCM data list.
  2. Ignition ON, the scan tool should display 0.5 to 3.0 volts in switch positions Mist, Delay 1-5, Low, and High.
    • If the scan tool displays 0.0 volts in the listed switch positions test the voltage supply circuit to the windshield wiper washer switch for an open or short to ground or the windshield wiper switch signal 2 and the washer pump control circuits for a short to ground.
  3. With the windshield wiper switch to the Low speed position the Front Wipers Active parameter in the BCM inputs data list should display On for several seconds.
    • If the scan tool does not display On test the windshield wiper motor high and low speed circuits for a short to ground. If the circuits test normal replace the ON/OFF WPR relay.
  4. Disconnect the windshield wiper motor connector.
  5. Verify that a test lamp will illuminate when connected from battery voltage to the ground circuit.
    • If the test lamp does not illuminate repair the windshield wiper motor ground circuit for an open/high resistance.
  6. If all the circuits test normal replace the windshield wiper motor.
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