AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM SYSTEM DESCRIPTION

  1. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL

    1. 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 swivel ECU assembly controls the system.

    2. Function of Main Components

      Component

      Outline

      Headlight Swivel 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 swivel 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 rear height control sensor sub-assembly signal to the headlight swivel ECU assembly.

      Brake Actuator Assembly (Skid Control ECU)

      Transmits speed sensor signal to the headlight swivel ECU assembly.

      ECM

      Transmits an engine running status signal to the headlight swivel ECU assembly.

      Main Body ECU (Multiplex Network Body ECU)

      Transmits a headlight status signal.

      Combination Meter Assembly

      If the system malfunctions, a warning message will be displayed on the multi-information display in the combination meter assembly in accordance with the signal from the headlight swivel ECU assembly.

    3. Initial Set Control

      When the engine is started, the headlight swivel 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 swivel ECU assembly thus assesses the position of the headlight for reference control.

      Note:

      • Initialize the headlight swivel ECU assembly when the headlight swivel ECU assembly is replaced.

      • Initialize the headlight swivel ECU assembly (set the zero point of the rear height control sensor sub-assembly in the headlight swivel 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.