LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Headlight Swivel ECU Assembly The headlight swivel ECU assembly receives various signals, calculates the target lighting angle and actuates the headlight leveling motor.
    Headlight Unit Headlight Leveling Motor

    • Based on the signals received from the headlight swivel ECU assembly, the motors move the reflectors in the headlights.

    • Uses a step motor to precisely regulate the angle of the reflectors.
    Rear Height Control Sensor Detects the height of the vehicle.
    Skid Control ECU Transmits the speed sensor signal to the headlight swivel ECU assembly.
    ECM Transmits the engine running status signal to the headlight swivel ECU assembly.
    Main Body ECU (Driver Side Junction Block Assembly) Transmits the headlight status signal to the headlight swivel ECU assembly.
    Combination Meter Assembly Multi-information Display Displays a warning message on the multi-information display if a malfunction is detected by the headlight swivel ECU assembly.
    Headlight Leveling Indicator Light If the system malfunctions, the meter ECU alerts the driver by illuminates the headlight leveling indicator light in accordance with the signal from the headlight swivel ECU assembly.

  2. FUNCTION


    1. The automatic headlight beam level control system mainly consists of the headlight swivel ECU assembly, rear height control sensor and 2 headlight leveling motors.

    2. The headlight swivel ECU assembly calculates changes in the vehicle posture based on the signals from the rear height control sensor.

    3. Following this, the ECU controls the headlight leveling motor based on this information, in order to change the headlight reflector angle.

    4. Initial Set Control


      1. When the engine is started, the headlight swivel ECU assembly drives the headlight leveling motor, 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.

  3. FAIL-SAFE


    1. If the headlight swivel ECU assembly detects a malfunction in the automatic headlight beam level control system, it will take the actions indicated in the table below:

      Trouble Area Condition (Fail-safe Control for Automatic Headlight Beam Level Control System) Headlight Leveling Indicator Light
      Speed Sensor Signal Malfunction Continues to control. Illuminates
      Height Control Sensor Signal Malfunction

      • Stops the operation after returning to the initial position (fails at higher than initial position).

      • Stops the operation in the current condition (fails at lower than initial position).

      		 Illuminates
      Headlight Leveling Motor Malfunction

      Normal Side Headlight Leveling Motor:


      • Stops the operation after returning to initial position (fails at higher than initial position).

      • Stops in current condition (fails at lower than initial position).

      		 Illuminates

      Abnormal Side Headlight Leveling Motor:


      • Stops in its current position.

      		 Illuminates
      Communication Signal Malfunction Continues to control. Illuminates

      Steering Angle Sensor:


      • Controls the system normally.

      		 Illuminates

  4. DIAGNOSIS


    1. If the headlight swivel ECU assembly detects a malfunction in the automatic headlight beam level control system, the headlight swivel ECU assembly illuminates the headlight leveling indicator light and displays a warning message on the multi-information display. At the same time, the Diagnostic Trouble Codes (DTCs) are stored in memory. The DTCs can be read by using the Global TechStream (GTS). For details, refer to the Repair Manual.