Sensor, Axle: Operation

The rear axle sensor monitors changes in the relative distance between the vehicle body and the rear suspension member. The sensor circuitry is energized by the Adaptive Front Lighting System (AFLS) module and the sensor provides a hardwired analog (potentiometer) inputs back to the AFLS module. The AFLS module uses the sensor inputs as logic for calculating when and how much to adjust the headlight beams as part of the automatic headlight leveling feature.

The body of the sensor is mounted in a fixed position, while the sensor lever arm is attached to a linkage arranged between the vehicle chassis and the rear suspension member. The sensor is capable of either analog or digital outputs. The output type is determined by the wiring connections to the pins in the sensor connector receptacle. The sensor circuitry is energized by the AFLS module. As the sensor lever arm is moved, it rotates an input shaft. The input shaft rotation is monitored by the sensor circuitry, which causes changes in the output signal of the sensor. The AFLS module evaluates the output signals from the sensor to determine what changes are occurring in the rear suspension height of the vehicle.

The most reliable, efficient, and accurate means to diagnose the axle sensor or the electronic controls and communication related to AFLS operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.