Grand Cherokee 4WD V8-4.7L Flex Fuel (2009)
Headlamp Alignment Sensor: Description and Operation
Axle Sensor - Description
DESCRIPTION
Two axle sensors (1) are used on vehicles equipped with the optional High Intensity Discharge (HID) headlamps, one each for the front and rear axles of
the vehicle. The front and rear sensors are identical, but are secured by screws to a unique fixed bracket that is mounted to a frame member below the
right front suspension upper control arm or above the right side of the rear axle below the upper control arm. The sensor has a mechanical lever arm (2)
that rotates a sensor input shaft. The opposite end of the lever arm is secured by a nut to a ball stud on a unique linkage that is articulated by the changing
positions of the right front or right rear suspension members in relationship to the body of the vehicle.
The axle sensor housing has an integral connector receptacle and integral mounting holes. A cavity in the center of the molded plastic axle sensor
housing contains the electronic circuitry of the sensor. The sensor housing is sealed to enclose and protect the internal electronic circuitry and
components. The axle sensors are each connected to the vehicle electrical system through a dedicated take out and connector of the vehicle wire harness.
The axle sensor, both unique brackets and the unique linkage are serviced only as a complete unit. The sensors cannot be repaired or adjusted and, if
damaged or ineffective, they must be replaced.
