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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 >> Cruise Control Malfunction >> 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.
IMPORTANT:
  • Verify there are no DTCs set as current. If any DTCs are set as current, refer to Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostics/repairs before proceeding with symptom based diagnostics.
  • Inspect the cruise control switches for any sticking or binding conditions.
  • Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation .
  • With the ignition ON, cruise control On/Off switch ON, rotate the steering wheel to both steering stops while activating each cruise control switch separately. With a scan tool, observe all cruise control switch parameters in the ECM/PCM. Ensure that each cruise control switch activates and that each of the displayed switch position parameters match the currently activated switch, and do not read Invalid. This will aid in locating an intermittent fault within the inflatable restraint steering wheel module coil.
  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 switch 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 3.
    • If the test lamp does not illuminate, test the cruise control switch signal circuit for an open or high resistance.
  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 3 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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