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Home >> Chevrolet >> 2006 >> HHR LS, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 376 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0572 or P0573 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet HHR. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the CHMSL relay.
  2. Connect a test lamp between the signal circuit terminal 1 and ground.
  3. 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.
  4. Ignition OFF, verify that a test lamp illuminates between the ground circuit terminal 2 and B+.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  5. Ignition OFF, connect the CHMSL relay.
  6. Ignition OFF, disconnect the harness connectors at the control modules ECM X1 (L61 or LE5) or X2 (LNF) and the TCM.
  7. Connect a test lamp between the TCM harness connector terminal 42 and ground.
  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, test or replace the CHMSL relay.
    • If the test lamp is always OFF, test the signal circuit and the CHMSL fuse circuit for a short to ground or an open/high resistance. If the circuits tests normal, test or replace the CHMSL relay.
  9. Ignition OFF, connect the harness connector at the TCM.
  10. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    • ECM harness connector X1 terminal 55 (L61 or LE5)
    • ECM harness connector X1 terminal 52 (LNF)
  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 ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the TCM.
    • If the test lamp is always OFF, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the TCM.
  12. If all circuit tests normal, replace the ECM.
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