LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. Daytime Running Light System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) The main body ECU (multiplex network body ECU) receives various signals and illuminates the daytime running lights via the running light relay.
      Running Light Relay The running light relay supplies power to operate them as daytime running lights.
      Headlight Dimmer Switch Assembly Light Control Switch The light control switch outputs a light control signal and transmits it to the main body ECU (multiplex network body ECU).
      Power Management Control ECU The power management control ECU receives the power switch signal, and outputs a READY signal to the main body ECU (multiplex network body ECU).
      Parking Brake Switch Assembly The parking brake switch assembly outputs a parking brake operation signal to the main body ECU (multiplex network body ECU).

    2. Light Emitting Diode (LED) Headlight System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) The main body ECU (multiplex network body ECU) receives the light control switch position signal from the light control switch and transmits a signal to the No. 1 integration relay.
      Headlight Dimmer Switch Assembly Light Control Switch The light control switch outputs a light control signal and transmits it to the main body ECU (multiplex network body ECU).
      No. 1 Integration Relay The No. 1 integration relay supplies power to the light control ECUs.
      Headlight Assembly Light Emitting Diode (LED) The Light Emitting Diode (LED) headlights shine ahead over a broader area and further forward, increasing the area visible to the driver.
      Light Control ECU The light control ECU keeps a constant level of direct current applied to the LEDs, achieving stable LED illumination.
      Combination Meter Sub-assembly Taillight Indicator Light The taillight indicator illuminates to inform the driver when the taillights are on.
      LED Headlight Warning Light The LED headlight warning light lights up to inform the driver when a malfunction is detected in the LED headlight system.

    3. Automatic Headlight Beam Level Control System (Models with LED Headlights)

      Component Function
      Headlight Leveling ECU Assembly

      • The headlight leveling ECU assembly detects changes of vehicle movement based on the height control sensor sub-assembly RR RH and vehicle speed signal.

      • The headlight leveling ECU assembly outputs control signals to the headlight leveling motors based on the detected value.

      • This ECU provides initial set control and a fail-safe function.
      Headlight Assembly LH/RH Headlight Leveling Motor LH/RH

      • Based on the signals received from headlight leveling ECU assembly, each headlight leveling motor moves the projector unit in the headlight to vary its angle.

      • Each headlight leveling motor uses a stepper motor to precisely regulate the angle of the projector unit.
      Main Body ECU (Multiplex Network Body ECU) The main body ECU (multiplex network body ECU) receives a HEAD light control switch signal and transmits it to the headlight leveling ECU assembly.
      No. 1 Integration Relay The No. 1 integration relay transmits the light control signal to the headlight leveling ECU assembly.
      Headlight Dimmer Switch Assembly Light Control Switch The light control switch outputs a light control signal and transmits it to the main body ECU (multiplex network body ECU).
      Height Control Sensor Sub-assembly RR RH The height control sensor sub-assembly RR RH detects vehicle movement and transmits a signal to the headlight leveling ECU assembly.
      Combination Meter Sub-assembly The combination meter sub-assembly transmits a vehicle speed signal to the headlight leveling ECU assembly.
      Combination Meter Sub-assembly Headlight Leveling Warning Light The automatic headlight leveling warning light illuminates to inform the driver when the headlight leveling ECU assembly detects malfunctions in this system.

    4. Manual Headlight Beam Level Control System (Models with Halogen Headlight System)

      Component Function
      Headlight Leveling Switch Assembly Sends control signals to the headlight leveling motor.
      Headlight Dimmer Switch Assembly Light Control Switch Outputs a light control signal and transmits it to the main body ECU (multiplex network body ECU).

      Headlight Assembly

      - Headlight Leveling Motor

      • Based on the signals received from the headlight beam level control switch, each motor moves the reflector in its headlight to vary its low beam angle.

      • This is a stepper type motor that is used to precisely regulate the angle of the reflector.
      Headlight Dimmer Relay Supplies power to the headlight assembly.

    5. Automatic Light Control System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) The main body ECU (multiplex network body ECU) receives various signals and illuminates the headlights, taillights, clearance lights and license plate lights.
      Headlight Dimmer Relay The headlight dimmer relay supplies power to the high beams.
      No. 1 Integration Relay The No. 1 integration relay supplies power to the low beams.
      TAIL Relay The TAIL relay supplies power to the taillights, clearance lights and license plate lights.
      Power Management Control ECU The power management control ECU receives the power switch push signal, and outputs a READY signal to the main body ECU (multiplex network body ECU).
      Automatic Light Control Sensor The automatic light control sensor detects the ambient light level.
      Headlight Dimmer Switch Assembly Light Control Switch The light control switch transmits an AUTO position signal to the main body ECU (multiplex network body ECU).
      Combination Meter Sub-assembly Taillight Indicator Light The taillight indicator illuminates to inform the driver when the taillights are on.

    6. Light Automatic Turn-off System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) The main body ECU (multiplex network body ECU) receives various signals, and turns off the exterior lights.
      Power Management Control ECU The power management control ECU receives the power switch signal, and outputs a READY signal to the main body ECU (multiplex network body ECU).
      Headlight Dimmer Relay The dimmer relay shuts down power to the high beams.
      No. 1 Integration Relay The No. 1 integration relay shuts down power to the low beams.
      TAIL Relay The TAIL relay shuts down power to the taillights, clearance lights and license plate lights.
      FR FOG Relay* The FR FOG relay shuts down power to the front fog lights.
      Headlight Dimmer Switch Assembly Light Control Switch The light control switch transmits a light control position signal to the main body ECU (multiplex network body ECU).
      Front Door Courtesy Light Switch Assembly (LH, RH) The courtesy light switch detects whether a door is open or closed and transmits a signal to the main body ECU (multiplex network body ECU).
      Rear Door Courtesy Light Switch Assembly (LH, RH)

      Back Door Lock Assembly

      - Courtesy Light Switch

      Front Door Lock Assembly (LH, RH)

      - Door Unlock Detection Switch

      		 The door unlock detection switch detects whether a door is locked or unlocked and transmits a signal to the main body ECU (multiplex network body ECU).

      Rear Door Lock with Motor Assembly (LH, RH)

      - Door Unlock Detection Switch
      Door Control Receiver The door control receiver receives the ID code from the door control transmitter in the actuation area and transmits it to the main body ECU (multiplex network body ECU) via the certification ECU (smart key ECU assembly).
      Certification ECU (Smart Key ECU Assembly) The certification ECU (smart key ECU assembly) judges and certifies the ID code from the door control receiver.

      *: Models with front fog light

  2. OPERATING CONDITION


    1. Daytime Running Light System


      1. The daytime running lights illuminate when the following conditions are met:


        • The power switch is on (READY).

        • The headlight dimmer switch assembly is in the OFF position.

        • The low beams are not on.

        • The parking brake is off.

    2. Light Automatic Turn-off System


      1. The light automatic turn-off system operates as follows:

        Function Operation Condition
        Driver Door-linked

        When all of the following conditions are met, the exterior lights automatically turn off:


        • The power switch is turned off or on (ACC).

        • The driver door is closed and then opened.

        • The headlight dimmer switch assembly is in the tail position.

  3. FUNCTION


    1. Automatic Headlight Beam Level Control System (Models with LED Headlights)


      1. The automatic headlight beam level control system mainly consists of the headlight leveling ECU assembly, height control sensor sub-assembly RR RH and 2 headlight leveling motors. The headlight leveling ECU assembly controls the system.

      2. The ECU detects the movement of the suspension from the height control sensor sub-assembly RR RH and the vehicle speed from the combination meter sub-assembly.

      3. The ECU then controls the headlight leveling motor based on this information, in order to change the headlight reflector angle.

      4. When the headlight leveling ECU assembly detects that the vehicle is stopped and the power switch is on (READY), the ECU executes the initial setting of the stepper motors.

  4. CONSTRUCTION


    1. LED Headlight System


      1. Projector Type LED Headlights


        • Through optimization of the shape of the lenses and reflectors inside the lights, a large illumination range has been realized.

          A0050NUE02
          Text in Illustration
          *1 Reflector *2 LED
          *a A-A Cross Section - -

      2. Parabolic Type LED Light


        • The optimal reflector shape contributes to effective illumination without any loss of discharged light.

          A0050TGE02
          Text in Illustration
          *1 LED *2 Reflector
          *a A-A Cross Section - -

      3. Light Control ECU


        • When the light control switch is turned on, the light control ECUs immediately turn on the LEDs (approximately 0.1 seconds). In addition, by regulating the output current flowing into the LEDs at a specified level, the light control ECUs prevent the light from getting brighter and dimmer due to voltage variation.

        • If a malfunction is detected in the LED headlight system, the light control ECU transmits a failure signal to the main body ECU (multiplex network body ECU). When the main body ECU (multiplex network body ECU) receives this failure signal, it transmits a signal to the combination meter sub-assembly to warn the driver.

  5. FAIL-SAFE


    1. LED Headlight System


      1. The light control ECU executes the fail-safe actions listed below in accordance with the problem that has been detected.

        Problem Outline
        Abnormal Input Voltage If the voltage that is input to the light control ECU deviates from the operating voltage (7 to 17 V), the light control ECU stops illuminating the headlights. It resumes illuminating the headlights once the voltage reverts to the operating voltage range.
        Abnormal Output (Open Circuit or Short Circuit) If an abnormal condition (open or short) occurs in the voltage that is output by the light control ECU, the light control ECU stops illuminating the headlights and will maintain this state until the power is reinstated. Power is reinstated by turning the headlight dimmer switch assembly (light control switch) from off to on.

    2. Automatic Headlight Beam Level Control System (Models with LED Headlights)


      1. If the headlight leveling ECU assembly detects a malfunction in the automatic headlight beam level control system, it will take the actions indicated in the table below.

        Trouble Area System Operation Automatic Headlight Level Indicator Light
        Headlight Leveling ECU Assembly Stops at current condition. -
        Height Control Sensor Sub-assembly RR RH Signal Illuminates

    3. Daytime Running Light System


      1. If the daytime running light system detects a malfunction, it will take the actions indicated in the table below.

        Problem System Operation
        Running Light Relay Overheated The daytime running lights will be turned off.
        Simultaneous Daytime Running Light and Headlight Illumination Requests The headlight illumination request is prioritized over operation of the daytime running light system.

  6. DIAGNOSIS


    1. LED Headlight System


      1. When the main body ECU (multiplex network body ECU) detects malfunctions in the LED headlight 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.

    2. Automatic Headlight Beam Level Control System (Models with LED Headlights)


      1. When the headlight leveling ECU assembly detects malfunctions in the automatic headlight beam level 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.

    3. Automatic Light Control System


      1. When the main body ECU (multiplex network body ECU) detects malfunctions 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.