LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Main Body ECU (Multiplex Network Body ECU) Receives various signals and illuminates the headlights, taillights, clearance lights and license plate lights.
    Automatic Light Control Sensor Detects the ambient light level.
    Headlight Dimmer Switch Assembly Outputs a light control signal to the main body ECU (multiplex network body ECU).
    Headlight Light Control ECU Sub-assembly LH/RH Supplies power to the headlights and clearance lights.
    TAIL Relay Supplies power to the taillights and license plate lights.
    Front Door Courtesy Light Switch Assembly (LH*1/RH*2) Detects whether a door is open or closed and transmits a signal to the main body ECU (multiplex network body ECU).

    *1: LHD Models

    *2: RHD Models

  2. SYSTEM CONTROL


    1. Operating Condition


      1. The automatic light control system operates as follows:

        Function Outline
        Taillights turn on

        When all of the following conditions are met, the taillights, clearance lights, and license plate lights automatically turn on:


        • The ambient light is dim or momentarily dark.

        • The engine switch is on (IG).

        • The light control switch is in the AUTO position.
        Headlights and Taillights turn on

        When all of the following conditions are met, the headlights, taillights, clearance lights, and license plate lights automatically turn on:


        • The ambient light is dark or momentarily bright.

        • The engine switch is on (IG).

        • The light control switch is in the AUTO position.
        Headlights and Taillights turn off When the ambient light is bright, the exterior lights automatically turn off.

  3. DIAGNOSIS


    1. When the main body ECU (multiplex network body ECU) detects a malfunction in the automatic light control system, Diagnostic Trouble Codes (DTCs) are stored in memory.

    2. The DTCs can be read using the Global TechStream (GTS). For details, refer to the Repair Manual.