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Circuit/System Testing

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 connectors at the appropriate inoperative backlighting component.
  2. Disconnect the negative terminal of the C1 Battery.
  3. Test for less than 5 Ω between the black wire of the appropriate component 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 of the appropriate component and ground.
  6. Command with the scan tool the LED Backlight Dimming test ON/OFF.
    • 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.
    • If the test lamp is always OFF, test the control circuit for open/high resistance or short to ground. If the circuit tests normal, replace the K9 BCM.
  7. If all circuit test normal, test or replace the appropriate inoperative backlighting component.
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