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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System And Washer System >> Diagnostic Information and Procedures >> Rear Wiper Washer System Malfunction >> Circuit/System Testing
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Circuit/System Testing

Wiper Motor Inoperative in All Modes

  1. Disconnect the rear wiper motor connector.
  2. Ignition ON, verify that a test lamp will illuminate when connected from the wiper motor supply circuit to ground.
    • If the test lamp does not illuminate repair the wiper motor supply circuit for an open/high resistance or short to ground.
  3. Verify that a test lamp will illuminate when connected from the wiper motor ground circuit to battery voltage.
    • If the test lamp does not illuminate repair the wiper motor ground circuit for an open/high resistance.
  4. If all the circuits test normal replace the rear wiper motor.

Wiper Motor Inoperative in Both Delay Modes

  1. Verify that the wiper fuse is not open.
    • If the wiper fuse is open repair the short to ground in the switch supply, delay 1 signal, delay 2 signal, or washer pump control circuit.
  2. Disconnect the wiper switch connector.
  3. Ignition ON, verify that a test lamp will illuminate when connected between the wiper switch supply circuit and ground.
    • If the test lamp does not illuminate repair the wiper switch supply circuit for an open/high resistance.
  4. Connect the wiper switch connector.
  5. Disconnect the wiper motor connector.
  6. Connect a test lamp between the delay 1 signal circuit and ground.
  7. Turn the rear wiper switch to the delay 1 position, the test lamp should illuminate.
    • If the test lamp does not illuminate replace the rear wiper/washer switch.
  8. If all the circuits test normal replace the rear wiper motor.

Wiper Motor Inoperative in One Delay Mode

  1. Disconnect the rear wiper motor connector.
  2. Connect a test lamp between the inoperative delay signal circuit and ground.
  3. Ignition ON, turn the rear wiper switch to the inoperative delay position, the test lamp should illuminate.
    • If the test lamp does not illuminate test the inoperative delay signal circuit for an open/high resistance. If the circuit tests normal replace the rear wiper switch.
  4. If all the circuits test normal replace the rear wiper motor.

Wiper Motor Always On

  1. Disconnect the rear wiper motor connector.
  2. Connect a test lamp between the delay 1 signal circuit and ground.
  3. Ignition ON, wiper switch OFF, the test lamp should not illuminate.
    • If the test lamp illuminates test the delay 1 signal circuit for a short to voltage. If the circuit tests normal replace the rear wiper switch.
  4. Connect a test lamp between the delay 2 signal circuit and ground.
  5. Ignition ON, wiper switch OFF, the test lamp should not illuminate.
    • If the test lamp illuminates test the delay 2 signal circuit for a short to voltage. If the circuit tests normal replace the rear wiper switch.
  6. If all the circuits test normal replace the rear wiper motor.

Washer Pump Inoperative

  1. Disconnect the rear washer pump connector.
  2. Connect a test lamp between the washer pump supply circuit and ground.
  3. Ignition ON, the test lamp should illuminate.
    • If the test lamp does not illuminate repair the rear washer pump supply circuit for an open/high resistance.
  4. Connect a test lamp between the washer pump supply circuit and control circuit.
  5. Ignition ON, washer switch pressed, the test lamp should illuminate.
    • If the test lamp does not illuminate test the washer pump control and switch ground circuits for an open/high resistance. If the circuits test normal replace the rear wiper washer switch.
  6. If all the circuits test normal replace the rear washer pump.

Washer Wiper Inoperative

  1. Disconnect the rear wiper motor connector.
  2. Connect a test lamp between battery voltage and the washer pump control circuit.
  3. The test lamp should illuminate while the washer switch is pressed.
    • If the test lamp does not illuminate repair the washer pump control circuit for an open/high resistance.
  4. If all the circuits test normal replace the rear wiper motor.

Washer Wipers and Pump Inoperative

  1. Disconnect the rear washer pump connector.
  2. Connect a test lamp between battery voltage and the washer pump control circuit.
  3. The test lamp should illuminate while the washer switch is pressed.
    • If the test lamp does not illuminate test the washer pump control and switch ground circuits for an open/high resistance. If the circuits test normal replace the rear wiper washer switch.

Washers Always On

  1. Disconnect the rear wiper motor connector.
  2. Connect a test lamp between battery voltage and the washer pump control circuit.
  3. The test lamp should not illuminate while the washer switch is OFF.
    • If the test lamp illuminates repair the washer pump control circuit for a short to ground. If the circuit tests normal replace the rear wiper washer switch.
  4. If all the circuits test normal replace the rear wiper motor.
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