LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. Daytime Running Light System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) Receives various signals and illuminates the daytime running lights via the DRL relay.
      DRL Relay Supplies power to the accessory light assemblies to operate them as daytime running lights.
      Headlight Dimmer Switch Assembly Light Control Switch Outputs a light control signal and transmits it to the main body ECU (multiplex network body ECU).
      Certification ECU (Smart Key ECU Assembly) Receives the power switch signal, and outputs a READY signal to the main body ECU (multiplex network body ECU).
      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) Receives the light control switch position signal from the light control switch and transmits a signal to the No. 1 integration relay and DIM relay.
      Headlight Dimmer Switch Assembly Light Control Switch Outputs a light control signal and transmits it to the main body ECU (multiplex network body ECU).
      No. 1 Integration Relay Supplies power to the LED driver modules.
      DIM Relay Transmits a HI/LO switch signal to the headlight assemblies.
      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.
      LED Driver Module Keeps a constant level of direct current applied to the LEDs, achieving stable LED illumination.
      Combination Meter Sub-assembly Taillight Indicator Light Illuminates to inform the driver when the taillights are on.
      LED Headlight Warning Light*1 Illuminates to inform the driver when a malfunction is detected in the LED headlight system.
      Master Warning Light*2 Illuminates or blinks to inform the driver when a malfunction is detected in the LED headlight system.
      Multi-information Display*2 Displays a warning message to inform the driver when an LED driver module detects a malfunction in this system.

      *1: Models with multi-information display

      *2: Models without multi-information display

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

      Component Function
      Headlight Leveling ECU Assembly

      • Detects changes of vehicle movement based on the height control sensor sub-assembly RR RH and vehicle speed signal.

      • Outputs control signals to the headlight leveling motors based on the detected value.

      • 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) Receives a HEAD light control switch signal and transmits it to the headlight leveling ECU assembly.
      No. 1 Integration Relay Transmits the light control signal to the headlight leveling ECU assembly.
      Headlight Dimmer Switch Assembly 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 Detects vehicle movement and transmits a signal to the headlight leveling ECU assembly.
      Combination Meter Sub-assembly Transmits a vehicle speed signal to the headlight leveling ECU assembly.
      Combination Meter Sub-assembly Headlight Leveling Warning Light Illuminates to inform the driver when the headlight leveling ECU assembly detects a malfunction in this system.

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

      • Each headlight leveling motor uses a stepper type motor that is used to precisely regulate the angle of the reflector.
      TAIL Relay Supplies power to the headlight leveling motor.

    5. Automatic Light Control System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) Receives various signals and illuminates the headlights, taillights, clearance lights and license plate lights.
      DRL Module* Supplies power to the high beams.
      No. 1 Integration Relay Supplies power to the headlights.
      TAIL Relay Supplies power to the taillights, clearance lights and license plate lights.
      Certification ECU (Smart Key ECU Assembly) Receives the power switch operation signal, and outputs a READY signal to the main body ECU (multiplex network body ECU).
      Automatic Light Control Sensor Detects the ambient light level.
      Headlight Dimmer Switch Assembly Light Control Switch Transmits an AUTO position signal to the main body ECU (multiplex network body ECU).
      Combination Meter Sub-assembly Taillight Indicator Light Illuminates to inform the driver when the taillights are on.

      *: Models with halogen headlights

    6. Light Automatic Turn-off System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) Receives various signals and turns off the exterior lights.
      Certification ECU (Smart Key ECU Assembly)

      • Receives the power switch signal, and outputs a READY signal to the main body ECU (multiplex network body ECU).

      • Judges and certifies the ID code sent from the door control receiver.
      DRL Module* Shuts down power to the high beams.
      No. 1 Integration Relay Shuts down power to the headlights.
      TAIL Relay Shuts down power to the taillights, clearance lights and license plate lights.
      FR FOG Relay Shuts down power to the front fog lights.
      Headlight Dimmer Switch Assembly 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) 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

      		 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 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).

      *: Models with halogen headlights

    7. Automatic High Beam System (Models with Automatic High Beam System)

      Component Function
      Forward Recognition Camera Determines when to turn the high beams on and off after identifying the lights of oncoming vehicles, preceding vehicles and other lights from the picture information of its camera sensor. Then, the sensor sends high beam request signals to the main body ECU (multiplex network body ECU).
      Main Body ECU (Multiplex Network Body ECU)

      • Receives a switch on signal from the automatic high beam switch.

      • Receives an AUTO or head position signal and high beam position signal from the headlight dimmer switch assembly.

      • Receives a high beam request signal and transmits it to the semiconductor No. 1 integration relay.
      Hybrid Vehicle Control ECU Outputs a signal to indicate that the shift lever is in R. Based on this signal, the forward recognition camera determines the direction of vehicle movement.
      Skid Control ECU Outputs information about the average speed of the 4 wheels. This information is used by the forward recognition camera to control switching between the high and low beams of the automatic high beam system.
      Combination Meter Sub-assembly

      • Illuminates the automatic high beam indicator light to inform the driver when the automatic high beam system is activated.

      • Illuminates the high beam indicator light to inform the driver when the high beams are on.
      Airbag ECU Assembly Outputs yawrate information.
      Automatic Light Control Sensor Detects the ambient light level and transmits a signal to the main body ECU (multiplex network body ECU).
      Automatic High Beam Switch Outputs the switch on signal to the main body ECU (multiplex network body ECU).
      Front Door Courtesy Light Switch Assembly (LH, RH) Detects whether a door is open or closed and transmits a signal to the main body ECU (multiplex network body ECU).
      Headlight Dimmer Switch Assembly Transmits the light control switch and dimmer switch signal to the main body ECU (multiplex network body ECU).
      Network Gateway ECU Transmits the data between CAN buses.

    8. Follow Me Home System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) Receives a light control signal and illuminates the headlights (low beam), clearance lights and taillights.
      Headlight Dimmer Switch Assembly Light Control Switch Outputs a light control signal and transmits it to the main body ECU (multiplex network body ECU).

  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 AUTO position (and the taillights are not turned on via the automatic light control system).

        • 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. Automatic High Beam System (Models with Automatic High Beam System)


      1. The automatic high beam system operates as follows:

        Function Operation Condition
        Active

        When all of the following conditions are met, the automatic high beam system is activated and the automatic high beam indicator light turns on:


        • The power switch is on (IG).

        • The light control switch (headlight dimmer switch assembly) is in the AUTO or head position and the low beam headlights are on.

        • The dimmer switch (headlight dimmer switch assembly) is in the high beam position.

        • The automatic high beam switch is ON.

        • The shift position is in any position other than R.
        High Beams on

        When all of the following conditions are met, the automatic high beam system turns on the high beams after a short delay:


        • Vehicle speed is more than approximately 40 km/h (25 mph)*1.

        • Vehicle speed is more than approximately 30 km/h (19 mph)*2.

        • The area in front of the vehicle is dark.

        • No oncoming vehicles are present with the headlights on.

        • No preceding vehicles are present with the taillights on.

        • Few streetlights are present along the street ahead.
        High Beams off

        When any of the following conditions is met, the automatic high beam system turns off the high beams after a short delay:


        • Vehicle speed is less than approximately 30 km/h (19 mph)*1.

        • Vehicle speed is less than approximately 25 km/h (16 mph)*2.

        • The area in front of the vehicle is not dark.

        • An oncoming vehicle with headlights on is detected.

        • A preceding vehicle with taillights on is detected.

        • Several streetlights are present along the street ahead.

        *1: Models for Europe

        *2: Except models for Europe

    4. Follow Me Home System


      1. The follow me home system operates if the lever of the headlight dimmer switch is pulled and released when both of the following conditions are met:


        • The power switch is off.

        • The headlight dimmer switch assembly is in the auto or off 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 adjusts the stepper motors to their initial setting.

    2. Automatic High Beam System (Models with Automatic High Beam System)


      1. When passing an oncoming vehicle:


        • The automatic high beam system turns off the high beams before an oncoming vehicle comes within approximately 800 m (2625 ft.).

        • When an oncoming vehicle passes out of camera sensor range, the automatic high beam system turns the high beams on after a short delay.

        B005KXME25
        Text in Illustration
        *a 800 m (2625 ft.) *b Delay
        *c Camera Sensor Angle - -

        Tech Tips


        • The detection distance varies depending on detected objects.

        • The timing of turning on and off the high beams varies depending on the intensity of oncoming (and preceding) vehicle lights.

      2. When passing a preceding vehicle:


        • When approaching a preceding vehicle, the automatic high beam system turns off the high beams approximately 600 m (1969 ft.) before reaching it.

        • When a preceding vehicle passes out of camera sensor range, the automatic high beam system turns the high beams on after a short delay.

        B005KQYE06
        Text in Illustration
        *a 600 m (1969 ft.) *b Delay
        *c Camera Sensor Angle - -

        Tech Tips

        The timing of turning on and off the high beams varies depending on the intensity of the preceding vehicle lights.

  4. CONSTRUCTION


    1. LED Headlight System (Models with LED Headlights)


      1. Bi-function


        • When the low beam is selected, a shade blocks light from the high beam side.

        • When the high beam is selected, the headlight actuator slides the shade down, thus increasing the illumination area and improving visibility when the high beam is selected.

        • The bi-function is activated by the main body ECU (multiplex network body ECU). The main body ECU receives a signal to turn on the high beams from the headlight dimmer switch assembly, then activates the built-in headlight actuator to slide the shade down.

          B005KQ2E02
          Text in Illustration
          *a Low Beam *b High Beam
          *c Shade - -

      2. LED Driver Module (Models with LED Headlights)


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

        • If a malfunction is detected in the LED headlight system, the LED driver module 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.

    2. Forward Recognition Camera


      1. The forward recognition camera consists of a Complementary Metal Oxide Semiconductor (CMOS) camera that receives images and a mirror portion that identifies light sources and judges whether to use high beams or low beams.

        B005KTME01
        Text in Illustration
        *1 Forward Recognition Camera - -
        *a Camera Portion - -

  5. FAIL-SAFE


    1. LED Headlight System


      1. The light control ECU executes the fail-safe functions 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 returns 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 headlight and will maintain this state until 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
        DRL 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 (Models with LED Headlights)


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

    4. Automatic High Beam System (Models with Automatic High Beam System)


      1. When the main body ECU (multiplex network body ECU) detects a malfunction in the automatic high beam 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.