Headlamp Alignment Control Module: Description and Operation

DESCRIPTION





Vehicles equipped with the optional Adaptive Front Lighting System (AFLS) (which includes the features formerly known as the headlamp leveling system required in some export markets) are also equipped with an AFLS module (1). The AFLS module is located on a bracket at the right front corner of the Power Distribution Center (PDC) located in the right front corner of the engine compartment.

This module works in conjunction with the front and rear axle (leveling) sensors, the headlamp leveling motors, the headlamp swiveling motors and electronic message inputs received over the Controller Area Network (CAN) data bus from other electronic modules in the vehicle. The module provides automatic headlamp beam aim adjustment to compensate for changes in vehicle height or direction caused by changes in vehicle loading, acceleration, deceleration, steering wheel angle and YAW rate.

The molded black plastic AFLS module housing has an integral latching mount that secures the unit to a stamped metal blade-type bracket integral to the PDC bracket. Concealed within the housing is the circuitry of the module, which includes a microprocessor. The module is connected to the vehicle electrical system through an integral connector receptacle (2) by a take out and connector of the headlamp and dash wire harness.

The AFLS module cannot be adjusted or repaired and, if ineffective or damaged, it must be replaced. The AFLS module is Flash programmable.