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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> DTC P0572 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the stop lamp switch.
  2. Ignition ON, verify that a test lamp illuminates between the stop lamp switch voltage circuit terminal B and ground.
    • If the test lamp does not illuminate, test the stop lamp switch voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the RUN/CRANK Relay.
  3. Ignition OFF, disconnect the harness connectors of the BCM X5, ECM X1, TCM (if equipped), Power Take Off (PTO) module (if equipped) and Trailer Brake controller (if equipped).
  4. Ignition OFF, verify that a test lamp does not illuminate between the stop lamp switch harness terminal A and B+.
    • If the test lamp illuminates, test the TCC brake signal circuit for a short to ground.
  5. Test for less than 1.0 ohm resistance between the stop lamp switch harness terminal A and ECM connector X1 terminal 9.
    • If resistance is not as specified, test the TCC brake signal circuit for an open/high resistance.
  6. If all circuits test normal, test or replace the stop lamp switch. If the component and all circuit tests are normal, replace the ECM.
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