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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Captiva Sport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the ECM.
  2. Disconnect the harness connector at the TCM.
  3. Connect a test lamp between the signal circuit terminal 57 at the ECM harness connector and ground.
  4. Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Ignition OFF, connect a test lamp between the signal circuit terminal 57 at the ECM harness connector and the connector terminal at the ECM.
  6. Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp does not turn ON and OFF when commanded, replace the ECM.
  7. Ignition OFF, connect a test lamp between the signal circuit terminal 10 at the TCM harness connector and ground.
  8. Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  9. If all circuits test normal, replace the TCM.
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