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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the control modules for the appropriate engine RPO listed below.
    • PCM X1 and TAC (with L26)
    • ECM X1 and TCM (with LD8)
  2. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    • TAC terminal 6 (with L26)
    • TCM terminal 42 (with LD8)
  3. Engine ON, press and release the brake pedal. The test lamp should turn 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 test 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 test normal, replace the BCM.
  4. Ignition OFF, connect the at the appropriate TAC or TCM control module.
  5. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    • PCM terminal 32 X1 (with L26)
    • ECM terminal 77 X1 (with LD8)
  6. Engine ON, press and release the brake pedal. The test lamp should turn ON and OFF when pressing and releasing the brake pedal.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the appropriate TAC or TCM.
  7. If all circuit tests normal, replace the appropriate PCM or ECM control module.
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