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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 (LAF/LF1) or X2 (LLT) harness connector at the K20 ECM.
  2. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    • Terminal 57 (LAF/LF1)
    • Terminal 52 (LLT)
  3. Ignition ON, verify the test lamp turns ON and OFF when pressing and releasing the brake pedal.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 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 K9 BCM.
  4. If all circuits test normal, replace the K20 ECM.
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