Headlamp Leveling Module - Export: Operation
The system is designed to automatically level the vehicles headlamps, regardless of cargo or passenger loads or road conditions. When the vehicle is loaded with passengers and/or cargo, as the ignition is turned to RUN, the system will look at the front and rear sensors and make an adjustment based upon feedback from the sensor to see if it has approximately 27.5 degrees from its zero or neutral position. The headlamp stepper motor then adjusts the headlamp up or down for proper headlamp aiming. The system is dynamic. The headlamp level will be adjusted while driving if required based on sensor inputs.
When in calibration mode, the key in the RUN position, the vehicle doors, trunk/liftgate, and hood must be closed. In addition, no one is seated in vehicle, the vehicle may not be touched (bounced or bumped) until the calibration is complete. The headlamps must be ON to power the stepper motors. The approximate calibration time is 12 - 15 seconds. The scan tool will display a "status of calibration" message. These being either "still in progress", "passed", or "failed."
If a system fault occurs, the translator module will store the Diagnostic Trouble Code (DTC) and enable it to be read using the scan tool and assist in diagnosing the headlamp leveling system.