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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 461 (Wiring Systems And Power Management - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Retained Accessory Power Malfunction >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect harness connector X2 of the right I/P junction block.
  2. Connect a test lamp between the accessory voltage circuit terminal B3 (component side) and ground.
  3. Command the scan tool Accy/RAP Relay ON and OFF. the test lamp should cycle on and off as appropriate.
    • If the test lamp is always ON, test the accessory voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the accessory voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
  4. If equipped with a sunroof, connect a test lamp between the accessory voltage circuit terminal B3 (harness side) and ground. The test lamp should not illuminate.
    • If the test lamp illuminates, test the accessory voltage circuit for a short to voltage.
  5. If all circuits test normal, replace the BCM.
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