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.
    Semiconductor PWR Integration ECU Supplies power to the headlights.

    Instrument Panel Junction Block Assembly


    • TAIL Relay

    		 Supplies power to the taillights, clearance lights and license plate lights.

    Headlight Dimmer Switch Assembly


    • Light Control Switch

    		 Outputs a light control switch position signal to the main body ECU (multiplex network body ECU).
    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. 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 ignition switch is ON.

      • 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 ignition switch is ON.

      • 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.