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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the CHMSL relay.
  2. Ignition OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 5 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 5 for a short to ground. If the circuit tests normal, test or replace the CHMSL relay.
  5. Ignition OFF, connect the CHMSL relay.
  6. Ignition OFF, disconnect the harness connectors at the appropriate control modules listed below.
    • ECM X2 and TCM X1 module (LNF)
    • ECM X1 and TCM X1 module (L61 or LE5)
  7. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    • ECM harness connector X2 terminal 52 (LNF)
    • ECM harness connector X1 terminal 55 (L61 or LE5)
  8. Ignition ON, press and release the brake pedal. 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 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. Ignition OFF, connect the harness connector at the ECM module.
  10. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    • TCM terminal 42 (LNF)
    • TCM terminal 42 (L61 or LE5)
  11. Ignition ON, press and release the brake pedal. Verify the test lamp turns ON and OFF when pressing and releasing the brake pedal.
    • If the test lamp is always OFF, test the signal circuit for an open/high resistance. If the circuit test normal, replace the ECM module.
  12. If all circuit tests normal, replace the TCM.
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