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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1089 (Lighting Systems) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Testing >> Interior Backlighting Malfunction - LED

Interior Backlighting Malfunction - LED

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 X3 harness connector at the BCM.
  2. Ignition ON, verify that a test lamp illuminates between the BCM 2 fuse voltage supply circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, reconnect the X3 harness connector at the BCM.
  4. Ignition OFF, disconnect the harness connector at the component with the inoperative LED backlighting.
  5. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  6. Connect a test lamp between the dimming control circuit and ground.
  7. Command the LED dimming control 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 control 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 control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  8. If all circuits test normal, test or replace the component with the inoperative LED backlighting.
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