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Home >> Pontiac >> 2007 >> Grand Prix Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 169 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0564 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
  2. Disconnect the cruise control switch.
  3. Ignition ON, measure for 10 volts or greater at the cruise control supply voltage circuit terminal 1.
    • If less than the specified value, test the cruise control supply voltage circuit for an open/high resistance or a short to ground.
  4. Ignition ON, verify that a test lamp illuminates between the cruise control supply voltage circuit terminal 1 and the cruise control switch signal circuit terminal 5.
    • If the test lamp does not illuminate, test the cruise control switch signal circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the ECM/PCM.
  5. Ignition OFF, disconnect the harness connector X1 at the ECM/PCM.
  6. Ignition ON, verify that a test lamp does not illuminate between the cruise control supply voltage circuit terminal 1 and the cruise control switch signal circuit terminal 5 of the cruise control switch harness.
    • If the test lamp illuminates, test the cruise control switch signal circuit for a short to ground.
  7. If the circuits test normal, test the cruise control switch. If the circuits and the component tests are normal, replace the ECM/PCM.
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