System Description [04/2013 - 10/2016]

AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL

General
When the low beam headlights are on, the automatic headlight beam level control operates the headlight leveling motor in accordance with movement of the vehicle. The headlight leveling ECU assembly controls the system.

Function of Main Components

Component	Outline
Headlight Leveling ECU Assembly	Receives various signals, calculates changes in the vehicle posture, and actuates the headlight leveling motor.
Headlight Leveling Motor	Based on the signals received from the headlight leveling ECU assembly, the motors move the reflectors in the headlight to vary the low beam. Uses a stepper motor to precisely regulate the angle of the projector.
Rear Height Control Sensor Sub-assembly	Transmits a height control sensor signal to the headlight leveling ECU assembly.
Brake Actuator Assembly (Skid Control ECU)	Transmits speed sensor signals (front LH and RH) to the headlight leveling ECU assembly.
ECM	Transmits an engine running status signal to the headlight leveling ECU assembly.
Main Body ECU (Multiplex Network Body ECU)	Transmits a headlight status signal.
Combination Meter Assembly	When the system malfunctions, the combination meter assembly alerts the driver by flashing the headlight leveling warning light in accordance with the signal from the headlight leveling ECU assembly.

Initial Set Control
When the engine is started, the headlight leveling ECU assembly drives the headlight leveling motor and moves the headlight reflector to the lower limit position and returns it to the proper position. The headlight leveling ECU assembly thus assesses the position of the headlight for reference control.
NOTE:
- Initialize the headlight leveling ECU assembly when the headlight leveling ECU assembly is replaced.
- Initialize the headlight leveling ECU assembly (set the zero point of the height control sensor in the headlight leveling ECU assembly) after the vehicle height changes due to replacement of suspension components or after performing such operations as removal and reinstallation or replacement of the rear height control sensor sub-assembly.