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Home › GMC › 2007 › Acadia SLE, FWD › Repair and Diagnosis › Body & Frame › Windows › Fixed & MOVEABLE Window Systems › Diagnostic Information and Procedures › DTC B0283 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the RR DEFOG relay.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal 85 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
  4. Ignition ON, command the rear 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 HVAC control module.
    • 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 HVAC control module.
  5. If all circuits test normal, test or replace the RR DEFOG relay.
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