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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Chevrolet Cruze. 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 tail lamp.
  2. Disconnect the negative terminal of the C1 Battery.
  3. Test for less than 5 Ω between the appropriate tail lamp ground circuit harness connector listed below and ground.
    • E5AA Tail/Brake Lamp - Left harness connector terminal 3
    • E5AB Tail/Brake Lamp - Right harness connector terminal 3
    • If greater than the specified value, 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 appropriate tail lamp control circuit harness connector listed below and ground.
    • E5AA Tail/Brake Lamp - Left harness connector terminal 2
    • E5AB Tail/Brake Lamp - Right harness connector terminal 2
  6. Command the appropriate Tail Lamp test 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 ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 Body Control Module.
  7. If all the circuits test normal, replace the appropriate inoperative tail lamp.
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