Circuit/System Verification

Ignition ON.
Verify that the stop lamps operate properly and that no B22 Brake Pedal Position Sensor related DTCs are set.
- If brake pedal position sensor related DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- If no brake pedal position sensor related DTCs are set
Verify the scan tool BCM Cruise Control Switch Status parameter changes between Off and On, Resume and Set when switching between each position on the cruise control switch.
- If the parameter does not change
  Refer to Circuit/System Testing .
- If the parameter changes
Verify that no conditions that may inhibit cruise control operation are present. Refer to the ECM scan tool data list Cruise Control Inhibit Reason parameter. Refer to Cruise Control Description and Operation for a list of inhibit reasons.
- If the cruise control system has a reason why it is inhibited
  Repair the condition that is causing the inhibit reason.
- If the cruise control system does not have any reasons why it may be inhibited
Verify that no cruise control related DTCs are set.
- If any cruise control related DTCs are set
  Refer to Circuit/System Testing .
- If no cruise control related DTCs are set
All OK.