AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM SYSTEM DESCRIPTION


  1. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL


    1. General


      • This system adjusts the headlight low beams when the vehicle is stopped to maintain a constant level.

      • This system is controlled by the headlight leveling ECU. This ECU detects the vehicle posture via the rear height control sensor, and detects the vehicle speed via the combination meter. The ECU then controls the headlight leveling motor based on these pieces of information in order to change the headlight reflector angle.

      Note


      • Initialize the height control sensor signal after the vehicle height changes due to replacement of the suspension or after performing such operations as removal and reinstallation or replacement of the rear height control sensor.

      • Initialization is also necessary when the headlight leveling ECU is replaced.

    2. Function of Main Components

      Component Outline
      Headlight Leveling ECU Assembly

      • Detects changes of vehicle movement based on the rear height control sensor sub-assembly LH and vehicle speed signal.

      • Outputs control signals to the headlight leveling motors based on the detected value.

      • Provides initial set control and a fail-safe function.
      Headlight Leveling Motor Based on the signals received from the headlight leveling ECU assembly, each motor moves the reflector in the headlight to vary its low beam height.
      Rear Height Control Sensor Sub-assembly LH Transmits a rear height control sensor sub-assembly signal to the headlight leveling ECU assembly.
      Brake Actuator Assembly (Skid Control ECU) Transmits a speed sensor signal to the headlight leveling ECU assembly.
      ECM Transmits an engine running status signal to the headlight leveling ECU assembly.
      Combination Meter Assembly Displays a warning message on the multi-information display if a malfunction is detected by the headlight leveling ECU assembly.

    3. Fail-safe

      The headlight leveling ECU operates in fail-safe mode if an abnormal condition has been detected, and a message is displayed on the multi-information display in the combination meter assembly when a malfunction is detected in the automatic headlight beam level control system.