AFS (ADAPTIVE FRONT-LIGHTING SYSTEM) SYSTEM DESCRIPTION


  1. General


    • An AFS (Adaptive Front-lighting System) is used in order to ensure a wide low beam lighting area and realize excellent visibility during turns by moving the low beam.

    • The AFS (Adaptive Front-lighting System) uses medium-to-high speed control and low speed control.

    • The AFS can be disabled through a customize setting Click here.

  2. Function of Main Components

    Component Outline
    Headlight ECU Subassembly LH Receives various signals, calculates the target lighting angle, and actuates the headlight swivel motor.
    Headlight Swivel Motor

    • Driven by the headlight ECU sub-assembly LH, the motor moves the low beam left or right to the angle calculated by the headlight ECU subassembly LH.

    • A stepper motor is used for the headlight swivel motor. The headlight ECU sub-assembly LH determines the low beam angle based on the number of steps (position) of the stepper motor.
    Steering Sensor Detects the steering angle and direction and outputs signals to the headlight ECU sub-assembly LH.
    Skid Control ECU Assembly Transmits speed sensor signals (front LH and RH) to the headlight ECU subassembly LH.
    Power Management Control ECU

    • Transmits an READY condition signal to the headlight ECU sub-assembly LH.

    • Transmits a shift position signal to the headlight ECU sub-assembly LH. The headlight ECU sub-assembly LH determines whether the vehicle is moving forward or backward based on this signal.
    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 ECU sub-assembly LH.

  3. Low Speed Control


    1. The headlight ECU sub-assembly LH performs low speed control when all of the following conditions are met:


      • The low beam headlights are on.

      • The vehicle speed is between 10 km/h (6 mph) and 30 km/h (19 mph).

      • The steering wheel is turned 6 degrees or more.

      Swivel Angle Range
      Driving Condition Low Beam
      Left Right
      Right Turn 0° Fixed 0° to 15° to Right
      Left Turn 0° to 15° to Left 0° Fixed

  4. Medium-to-High Speed Control


    1. The headlight ECU sub-assembly LH performs medium-to-high speed control when all of the following conditions are met:


      • The low beam headlights are on.

      • The vehicle speed is 30 km/h (19 mph) or more.

      • The steering wheel is turned 7.5 degrees or more.

      Swivel Angle Range
      Driving Condition Low Beam
      Left Right
      Right Turn 0° Fixed 0° to 10° to Right
      Left Turn 0° to 10° to Left 0° Fixed

  5. Operation Stop Condition


    1. The headlight ECU sub-assembly LH stops performing control when any of the following conditions is met:


      • The power switch is not on (READY).

      • The low beam headlights are turned off.

      • The vehicle speed becomes less than 10 km/h (6 mph).

      • The steering angle becomes less than 6 degrees.

      • shift lever is moved to N or R.

  6. Initial Set Control


    1. When the READY condition signal received, the headlight ECU sub-assembly LH operates the headlight swivel motors to confirm the initial position. The headlights are moved toward the center of the vehicle and then returned to their normal position. The headlight ECU sub-assembly LH does this to confirm the initial position of the headlights.