Liberty Sport 2WD L4-2.4L VIN 1 (2002)
Headlamp Motor: Description and Operation
Fig.31 Headlamp Unit - With Leveling
HEADLAMP LEVELING MOTOR
The headlamp leveling motor is located on the rear inboard side of each headlamp unit on models equipped with the headlamp leveling system,
which is available only in certain markets where required (Fig. 31). The motor is encased within a molded plastic housing and is secured by an
integral wedge-type mounting boss on its forward surface to a flanged receptacle on the back of the headlamp unit housing. A rubber seal around
the circumference of the mounting boss is compressed and seals the motor to the headlamp unit when the boss is properly installed in the flanged
receptacle. The outside of the motor housing features an integral molded connector receptacle on its rearward surface, a hex-headed adjusting
screw extends from the top of the housing, and a plastic pushrod with a ball formation on its free end extends from the center of the mounting boss
at the front. Within the motor housing is a 12-volt Direct Current (DC) servo motor, an electronic controller board that includes the motor logic
circuits, and an integral screw-drive transmission. The headlamp leveling motor is connected to the vehicle electrical system through a dedicated
take out and connector of the front fascia wire harness.
The headlamp leveling motor cannot be repaired and, if faulty or damaged, the unit must be replaced.
The controller board and logic circuitry of the headlamp leveling motor will energize the motor and extend or retract the motor pushrod through
the integral screw-drive transmission based upon the voltage signal input received from the resistor multiplexed headlamp leveling switch. The ball
formation on the end of the headlamp leveling motor pushrod is snapped into a socket formation on the back of the movable reflector within the
headlamp unit housing. The headlamp leveling motors and switch have a path to ground at all times. The headlamp leveling components operate
on battery current received through the fused park lamp relay output circuit so that the system will only operate when the exterior lighting is turned
ON.
Because of active electronic elements within the headlamp leveling motor, it cannot be tested with conventional automotive electrical test
equipment. If the headlamp leveling motor is believed to be faulty, replace the motor with a known good unit to confirm system operation.
