Headlamp Alignment Actuator - Operation

OPERATION

The controller board and logic circuitry of the headlamp leveling motor controls motor operation based upon a voltage signal input received from the Instrument Panel Cluster (IPC) based upon manual inputs to the IPC through the headlamp leveling push buttons integral to the IPC. The headlamp leveling motors have a path to ground at all times. The motors operate only when the ignition switch and the headlamp low beams are turned ON. When the motor is energized it will extend or retract the motor pushrod through an integral screw-drive transmission. The ball on the end of the pushrod is snapped into a socket clip on the back of the reflector within the upper front combination lamp unit housing, which will cause the reflector to move as the pushrod is extended or retracted, changing the angle at which the light is projected from the headlamp.

The hard wired circuits for the headlamp leveling motors may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the active electronic elements within the headlamp leveling motors or the IPC. The most reliable, efficient, and accurate means to diagnose the headlamp leveling motor or the electronic controls and communication related to headlamp leveling system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.