Commander 4WD V8-4.7L Flex Fuel (2009)
Headlamp Alignment Actuator: Description and Operation
Headlamp Alignment Actuator - Operation
OPERATION
The controller board and logic circuitry of the headlamp leveling motor control motor operation based upon a voltage signal input received from the
resistor multiplexed headlamp leveling switch in the upper switch pod on the instrument panel. When the motor is energized it will extend or retract the
motor pushrod through the integral screw-drive transmission. The ball on the end of the pushrod is snapped into a socket on the back of the reflector
within the front 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 low and high beam bulbs.
The headlamp leveling motors and switch have a path to ground at all times. The headlamp leveling components operate on battery voltage 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 using conventional diagnostic tools and procedures. If the
headlamp leveling motor is believed to be ineffective, the hard wired headlamp leveling motor circuits and the leveling switch must be tested before
considering motor replacement. Refer to the appropriate wiring information.
