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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1318 (Wiring Systems And Power Management - Service, Troubleshooting & Diagnosis) >> Retained Accessory Power Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  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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