LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Adaptive High-beam System Switch Outputs an adaptive high-beam system switch on signal to the main body ECU (multiplex network body ECU).
    Forward Recognition Camera Captures an image of the area in front of the vehicle and uses the image to determine the position of preceding and oncoming vehicles and to determine the brightness of the surrounding area. This data is then sent to the headlight ECU sub-assembly LH via CAN communication.
    Main Body ECU (Multiplex Network Body ECU)

    • Receives signals from the headlight dimmer switch assembly and automatic light control sensor.

    • Controls the headlight ECU sub-assembly LH and headlight ECU sub-assembly RH based on signals from various sensors and switches.
    Skid Control ECU Assembly Sends vehicle speed signals to the headlight ECU sub-assembly LH.
    Headlight Assembly LH/RH Headlight ECU Sub-assembly LH/RH

    • Receives signals from various sensors and controls the headlight brightness and illumination area based on the conditions of the vehicle and surroundings.

    • Sends adaptive high-beam system control request signals to the headlight light control ECU assemblies.

    • Stores DTCs when a malfunction is detected in the adaptive high beam system.
    Headlight Light Control ECU Assembly LH/RH

    • Receives signals from various sensors and controls the headlight illuminations based on the conditions of the vehicle and surroundings.

    • Sends illumination request signals for the adaptive high beam indicator light and high beam indicator light to the combination meter assembly according to the operation condition of the headlight system.
    Headlight Leveling Motor LH/RH Controls the vertical alignment of the headlight beam according to control signals from the headlight ECU sub-assembly LH or headlight ECU sub-assembly RH.
    Combination Meter Assembly Adaptive High-beam System Indicator Light Illuminates when the adaptive high beam system is on.
    High Beam Indicator Light Illuminates when the high beams are on.
    Master Warning Light Illuminates when a malfunction is detected in the adaptive high-beam system.
    Multi-information Display Displays a warning message when a malfunction is detected in the adaptive high-beam system.
    Automatic Light Control Sensor Detects the brightness of the surrounding area and sends a signal to the main body ECU (multiplex network body ECU).
    Rear Height Control Sensor Sub-assembly RH Detects the height of the vehicle and sends the signal to the headlight control ECU sub-assembly LH.

  2. SYSTEM CONTROL


    1. Operation Conditions of the Adaptive High Beam System


      1. The adaptive high beam system operates when all of the following conditions are met. While the adaptive high beam system is on, the adaptive high beam indicator light illuminates.


        • The power switch is on (IG).

        • The light control switch is in the HEAD position and AUTO position and the headlights are operating.

        • The dimmer switch is in the HI position.

        • The adaptive high beam system switch is on. *1

        • The vehicle speed is approximately 15 km/h or more.*2

        • The vehicle speed is approximately 60 km/h or more.*3

        *1: When the auto high beam switch is turned on while the headlights are not illuminated or the dimmer switch in a position other than HI, a message is displayed on the multi-information display.

        *2: Except models for Europe

        *3: Models for Europe

    2. High Beam Light Distribution Control Function


      1. In high beam light distribution control function, the headlight light control ECU assemblies control the brightness and illumination area of the high beam.

      2. The high beam light distribution control function, changes the intensity and illumination area according to 3 vehicle speed ranges:

        Illumination Mode Description of Function Vehicle Speed
        Low Speed Mode (Town Mode)

        • Widens the illuminated area.

        • The brightness of the headlights is adjusted to ensure that pedestrians are visible while not being dazzled.

        • Reduces illumination of the side of the road.

        • 15 - 30 km/h

          (10 - 19 mph)*1

        • -*2
        Normal Mode

        • At medium speeds, the illuminated area in front of the vehicle is extended and necessary areas to the left and right of the vehicle are illuminated.

        • Illuminates the outer LED unit to enhance the intensity of the headlights.

        • 30 - 80 km/h

          (19 - 50 mph)*1

        • 60 - 100 km/h

          (38 - 63 mph)*2
        High Speed Mode

        • The illuminated area in front of the vehicle is narrowed.

        • Adjusts the high beams to ensure visibility far in front of the vehicle.

        • Illuminates the outer LED unit to enhance the intensity of the headlights.

        • 80 km/h (50 mph) or more*1

        • 100 km/h (63 mph) or more*2

        *1: Except models for Europe

        *2: Models for Europe

        Figure 1. Low Speed Mode (Town Mode)

        A01R29AC01
        *a Area Illuminated by High Beams *b Area Illuminated by Low Beams

        Figure 2. Normal Mode

        A01R1XWC01
        *a Area Illuminated by High Beams *b Area Illuminated by Low Beams

        Figure 3. High Speed Mode

        A01R24HC01
        *a Area Illuminated by High Beams *b Area Illuminated by Low Beams

    3. Light Disable Control Function


      1. The light disable control function dims LEDs in the high beam headlight accordingly when the forward recognition camera assembly detects a preceding vehicle or an oncoming vehicle.

      2. The headlight light control ECU assemblies and LED unit enable the LEDs of the headlight assembly to be dimmed independently as necessary.

        A01R25HC01
        *A When driving on road with one lane in each direction *B When driving on a multi-lane road
        *a Area Illuminated by High Beams *b Area Illuminated by Low Beams

    4. Headlight Swivel Control Function


      1. The headlight swivel control function adjusts the brightness of headlights while turning a corner to ensure excellent visibility.

        A01R27RC01
        *a Area Illuminated by High Beams *b Area Illuminated by Low Beams

    5. Cut-off Line Tilt Control Function


      1. The cut-off line tilt function controls the leveling motor built into the headlight assembly to optimize the illumination area of the low beams in accordance with the distance to the preceding vehicle detected by the forward recognition camera.

        A01R2MYC01
        *a Illumination Area of Low Beams without Control *b Illumination Area of Low Beams during Control

  3. FUNCTION


    1. The adaptive high beam system operates when the adaptive high beam system switch is on, the light control switch is in the HEAD or AUTO position and the dimmer switch is set to HI. The adaptive high beam system uses the forward recognition camera to detect the lights of oncoming vehicles and the taillights of preceding vehicles and to determine the brightness of the surrounding area in order to select which LEDs of the LED array to illuminate.

    2. The headlight ECU sub-assemblies control the adaptive high beam system.

    3. When the adaptive high beam system is on, the adaptive high beam indicator light in the combination meter assembly illuminates.

  4. FAIL-SAFE


    1. The headlight light control ECU assemblies prohibit operation of the adaptive high beam system if a malfunction is detected in the system.