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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1087 (Lighting Systems) >> Diagnostic Information and Procedures >> Courtesy Lamps Malfunction >> Circuit/System Testing >> Rear Compartment Courtesy Lamp Malfunction

Rear Compartment Courtesy Lamp Malfunction

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the rear compartment courtesy lamp.
  2. Open the trunk.
  3. Ignition OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the rear compartment release switch.
  4. Ignition OFF, connect a test lamp between the courtesy lamp supply voltage circuit terminal C and ground.
  5. Command the courtesy lamps 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 OFF, test the courtesy lamp supply voltage 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 courtesy lamp supply voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, replace the rear compartment courtesy lamp.
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