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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> DTC P0564 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X201 harness connector at the turn signal/multifunction switch.
  2. Ignition ON, test for B+ between the B+ circuit terminal A8 and ground.
    • If less than the specified value, test the circuit for a short to ground or an open/high resistance.
  3. Verify the scan tool Cruise ON/OFF switch parameter displays OFF.
    • If not the specified value, test the signal circuit terminal B8 for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Install a 3A fused jumper wire between the signal circuit terminal B8 and the B+ circuit terminal A8. Verify the scan tool Cruise ON/OFF Switch parameter displays ON.
    • If not the specified value, test the 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 turn signal/multifunction switch.
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