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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 85 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> Washer Inoperative - Rear >> Circuit/System Testing

Circuit/System Testing

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Rear Wiper Washer Switch Circuit Test

  1. Disconnect the rear wiper washer switch pigtail connector.
  2. Ignition ON, verify that a test lamp illuminates when connected from the switch supply circuit terminal in the harness connector to ground.
    • If the test lamp does not illuminate test the switch supply circuit for an open or short to ground. If the circuit tests normal replace the BCM.
  3. If the circuits test normal replace the rear wiper washer switch.

Rear Washer Pump Circuit Test

  1. Remove the REAR WASH 15A fuse in the underhood fuse block and connect a fused jumper wire to the washer pump output fuse terminal in the fuse block.
  2. Verify that the rear washer pump operates when the other end of the fused jumper wire is connected to battery voltage.
    • If the washer pump does not operate, test the washer pump control and ground circuits for an open or short to ground. If the circuits test normal replace the rear washer pump.
  3. Disconnect the underhood fuse block connector C4 and connect a test lamp from the rear washer pump relay control circuit terminal in the harness connector to ground.
  4. Ignition on, verify that a test lamp illuminates when the rear washer switch is pressed.
    • If the test lamp does not illuminate test the relay control circuit for an open or short to ground. If the circuit tests normal replace the rear wiper washer switch.
  5. If the circuits test normal replace the underhood fuse block.

Rear Wiper Motor Circuit Test

  1. Disconnect the rear wiper motor connector and connect a test lamp from the rear wiper switch signal circuit terminal in the harness connector to ground.
  2. Ignition on, verify that the test lamp will illuminate when the WASH switch is pressed.
    • If the test lamp does not illuminate test the rear wiper switch signal circuit for an open or short to ground. If the circuit tests normal replace the rear wiper washer switch.
  3. If the circuits test normal replace the rear wiper motor.
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