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Interior Backlighting Circuit Test

WARNING: This page is about a different car, the 2011 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate inoperative backlighting component.
  2. Disconnect the negative terminal of the C1 Battery.
  3. Test for less than 5 Ω between the ground circuit terminal black wire and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Reconnect the negative terminal to the C1 Battery.
  5. Connect a test lamp between the control circuit terminal yellow wire and ground.
  6. Ignition ON, command the LED Backlight Dimming 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 K9 BCM.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
  7. If all circuits test normal, test or replace the appropriate component with the inoperative backlighting.
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