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Home >> Pontiac >> 2008 >> Solstice Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Cruise Control System) >> Diagnostic Information & Procedures >> Cruise Control Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: In order to avoid misdiagnosis, inspect for the following:
  • 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, 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. 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 Error. This will aid in locating an intermittent fault within the inflatable restraint steering wheel module coil.
  1. With the ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
  2. Disconnect the harness connector at the cruise control switch.
  3. Ignition ON, test for greater than 10 volts between the supply circuit terminal 1 and ground.
    • If less than the specified range, test the supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool Cruise Control Switch parameter is OFF.
    • If not the specified value, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the BCM.
  5. Ignition OFF, connect the harness connector at the cruise control switch.
  6. Ignition ON, cruise control switch ON, observe the scan tool Cruise Control Switch parameter. The parameter should display ON.
    • If not the specified value, test the signal circuit terminal 3 for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the cruise control switch.
  7. Observe the scan tool Cruise Control Switch parameter while pressing the RES + portion of the cruise control switch. The parameter should display Resume.
    • If not the specified value, test or replace the cruise control switch.
  8. Observe the scan tool Cruise Control Switch parameter while pressing the SET - portion of the cruise control switch. The parameter should display Set.
    • If not the specified value, test or replace the cruise control switch.
  9. Observe the scan tool Cruise Control Switch parameter while pressing the Cancel portion of the cruise control switch. The parameter should display Cancel.
    • If not the specified value, test or replace the cruise control switch.
  10. If all circuits and the component test normal, replace the BCM.
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