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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the rear window wiper motor.
  2. Ignition ON, connect a test lamp between the signal circuit terminal B and ground.
  3. Command the liftglass latch to release by pressing the liftgate window release switch. The test lamp should briefly illuminate when the liftgate window release switch is pressed.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the rear window wiper motor.
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