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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 or P0573 >> Circuit/System Testing

Circuit/System Testing

  1. Disconnect the harness connector of the stop lamp switch.
  2. Ignition ON, test for B+ between the stop lamp switch connector terminal B and ground.
    • If the reading is less than specified, test the supply circuit for a short to ground or an open/high resistance.
  3. Verify the BPP Circuit Signal data parameter displays released.
    • If the parameter displays applied, test the TCC Brake signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Connect a 3 amp fused jumper between stop lamp switch harness terminals A and B. Verify the BPP Circuit Signal data parameter displays applied.
    • If the parameter displays released, test the TCC Brake Signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the stop lamp switch.
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