LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Headlight Unit Headlight Leveling Motor

    • Based on the signals received from the AFS ECU, 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 front speed sensor signal to the AFS ECU.
    ECM Transmits the engine running status signal to the AFS ECU.
    Main Body ECU Transmits the headlight status signal to the AFS ECU.
    Combination Meter Assembly Multi-information Display Displays a warning message on the multi-information display if a malfunction is detected by the AFS ECU.
    AFS Off Indicator Light If the system malfunctions, the meter ECU alerts the driver by blinking the AFS off indicator light in accordance with the signal from the AFS ECU.

  2. FUNCTION


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

    2. The AFS ECU 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 AFS ECU drives the headlight leveling motor, moves the headlight reflector to the lower limit position and returns it to the proper position. The AFS ECU thus assesses the position of the headlight for reference control.

  3. FAIL-SAFE


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

      Trouble Area Condition (Fail-safe Control for Automatic Headlight Beam Level Control) AFS Off Indicator Light
      Headlight Swivel Motor Malfunction Continues to control until a position of 0.7° less than the current position is reached. Blinks
      Steering Angle Sensor Signal Malfunction Continues to control. Blinks
      Speed Sensor Signal Malfunction Continues to control. Blinks
      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).

      		 Blinks
      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).

      		 Blinks

      Abnormal Side Headlight Leveling Motor:


      • Stops in its current position.

      		 Blinks
      Communication Signal Malfunction Continues to control. Blinks

      Steering Angle Sensor:


      • Controls the system normally.

      		 Blinks

  4. DIAGNOSIS


    1. If the AFS ECU detects a malfunction in the automatic headlight beam level control system, the AFS ECU blinks the AFS off indicator light. At the same time, the Diagnostic Trouble Codes (DTCs) are stored in memory. The DTCs can be read by using the intelligent tester II. For details, refer to the corresponding Repair Manual for this model.