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Circuit/System Testing

  1. Ignition OFF, disconnect the rear window defog relay.
  2. Test for less than 1.0 ohm of resistance between the rear defog relay coil side ground circuit and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the rear defog relay control circuit and ground.
  4. Command the rear window defog relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the rear window defog relay.
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