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.
      Engine Room Junction Block Assembly Supplies power to the high beams 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).
      Instrument Panel Junction Block Assembly Receives the ignition signal and transmits it to the instrument panel junction block assembly.
      Parking Brake Switch Assembly Outputs a parking brake operation signal to the main body ECU (multiplex network body ECU).

    2. High Intensity Discharge (HID) Headlight System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) Receives the light control signal and transmits a signal to the headlight dimmer 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).
      Headlight Assembly Discharge Bulb The discharge bulb light shines ahead over a broader area and further forward, increasing the area visible to the driver.
      Light Control ECU Transforms battery voltage to a high voltage of up to 25000 V and applies it to the discharge bulbs in order to illuminate them.
      Headlight Relay Supplies power to the light control ECUs.

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

      Component Function
      Headlight Leveling ECU Assembly

      • Detects changes of vehicle movement based on the rear height control sensor sub-assembly 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 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 (LH, RH) Headlight Leveling Motor (LH, RH)

      • Based on the signals received from the headlight leveling ECU assembly, each headlight leveling motor moves the projector unit in its 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 light control signal and transmits it to the headlight leveling ECU assembly.
      Rear Height Control Sensor Sub-assembly Detects vehicle movement and transmits a signal to the headlight leveling ECU assembly.
      Combination Meter Assembly Headlight Leveling Warning Light Flashes to inform the driver when the headlight leveling ECU assembly detects malfunctions in this system.

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

      Component Function
      Lane Departure Warning 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, it sends high beam request signals to the main body ECU (multiplex network body ECU)*1 or driving support ECU assembly*2 via CAN.
      Driving Support ECU Assembly Acts as the gateway between the lane departure warning camera (Local CAN) and CAN (V Bus).
      Main Body ECU (Multiplex Network Body ECU)

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

      • Receives a high beam request signal and transmits them to the engine room junction block assembly.
      Skid Control ECU Outputs information about the average speed of the 4 wheels. This information is used by the lane departure warning camera to control switching between the high and low beams of the automatic high beam system.
      Power Management Control ECU Outputs a signal to indicate that the shift lever is in R. Based on this signal, the lane departure warning camera determines the direction of vehicle movement.
      Headlight Dimmer Switch Assembly Transmits an AUTO position or high beam position signal to the main body ECU (multiplex network body ECU).
      Auto High Beam Switch Enables or disables the automatic high beam system.
      Automatic Light Control Sensor Detects the ambient light level and transmits a signal to the main body ECU (multiplex network body ECU).
      Combination Meter Assembly Automatic High Beam Indicator Light Illuminates to inform the driver when the automatic high beam system is activated.
      High Beam Indicator Light Illuminates to inform the driver when the high beams are on.

      *1: Models without dynamic radar cruise control system

      *2: Models with dynamic radar cruise control system

    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.

      Engine Room Junction Block Assembly

      - No. 1 Integration Relay

      		 Supplies power to the high beams.
      Headlight Relay Supplies power to the low beams.

      Instrument Panel Junction Block Assembly

      - TAIL Relay

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

      • Receives the ignition signal and transmits it to the main body ECU (multiplex network body ECU).
      Certification ECU (Smart Key ECU Assembly) Receives the ignition signal and transmits it to the instrument panel junction block assembly.
      Automatic Light Control Sensor Detects the ambient light level.
      Headlight Dimmer Switch Assembly Light Control Switch Outputs a light control signal and transmits it to the main body ECU (multiplex network body ECU).
      Combination Meter Assembly Taillight Indicator Light Lights up to inform the driver when the taillights turn on.

    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 ignition signal and transmits it to the instrument panel junction block assembly.

      • Judges and certifies the ID code from the door control receiver.
      Headlight Dimmer Relay Shuts down power to the low beams.

      Engine Room Junction Block Assembly

      - No. 1 Integration Relay

      		 Shuts down power to the high beams and front fog lights.

      Instrument Panel Junction Block Assembly

      - TAIL Relay

      		 Shuts down power to the taillights, clearance lights and license plate 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).
      Front Door Courtesy Light Switch Assembly (LH) Detects whether a door is open or closed and transmits a signal to the main body ECU (multiplex network body ECU).
      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).

    7. Door Mirror Foot Light System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) Receives various signals and illuminates the door mirror foot lights.
      Outer Mirror Control ECU (LH, RH) The outer mirror control ECU receives request signals and illuminates the door mirror foot lights.
      Certification ECU (Smart Key ECU Assembly)

      • Receives the ignition signal and transmits it to the instrument panel junction block assembly.

      • Judges and certifies the ID code from the door control receiver.

      • Front Door Courtesy Light Switch Assembly (LH/RH)

      • Rear 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).

      • Front Door Lock Assembly LH/RH

      • Rear Door Lock Assembly LH/RH

      		 Detects whether a door is locked or unlocked and transmits a signal to the main body ECU (multiplex network body ECU).

    8. Illumination System

      Component Function
      Main Body ECU (Multiplex Network Body ECU) Receives various signals and illuminates the clearance lights, taillights and license plate lights.
      Certification ECU (Smart Key ECU Assembly)

      • Receives the ignition signal and transmits it to the instrument panel junction block assembly.

      • Judges and certifies the ID code from the door control receiver.
      Automatic Light Control Sensor Assembly The automatic light control sensor assembly detects the ambient light level and transmits them to the main body ECU (multiplex network body ECU).

      • Front Door Lock Assembly LH/RH

      • Rear Door Lock Assembly LH/RH

      		 Detects whether a door is locked or unlocked and transmits a signal to the main body ECU (multiplex network body ECU).

    9. 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 all of the following conditions are met:


        • The power switch is on (READY).

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

        • The low beams are not on.

        • The parking brake is off.

    2. 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 automatic high beam system is activated (the auto high beam switch is not operated).

        • The headlight dimmer switch is in the AUTO position and high beam position.

        • The automatic light control sensor outputs the night mode signal (to turn the headlights on).
        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 or 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 are 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 or 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 (destination package for Russia and Ukraine)

        *2: Models for China and destination package for Taiwan

    3. Light Auto Turn-off System


      1. The light auto 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 on (ACC) or turned off.

        • The driver door is closed and then opened.

    4. Door Mirror Foot Light System


      1. The door mirror foot light system operates as follows:

        Function Operation Condition
        Actuation Area-linked

        When all of the following conditions are met, the door mirror foot lights automatically turn on:


        • The power switch is off.

        • All doors are closed.

        • The key is detected in the actuation area.

        When the following condition is met, the door mirror foot lights automatically turn off:


        • The key is not detected in the actuation area.
        Door Unlock-linked

        When all of the following conditions are met, the door mirror lights automatically turn on:


        • The power switch is off.

        • Any door is unlocked.

        • All doors are closed.
        Door Lock-linked

        When one of the following conditions is met, the door mirror foot lights automatically turn off:


        • All doors are locked.

        • All doors are closed.

        • A door lock control switch outputs the lock signal.
        Door-linked

        When the following condition is met, the door mirror foot lights automatically turn on:


        • Any door is opened and then closed.
        Delay

        When approximately 15 seconds elapse after one of the following condition is met, the door mirror lights turn off:


        • An actuation area-linked function is used.

        • The door unlock-linked function is active.

        • Any door is opened and then closed.

    5. Illumination System


      1. The Illumination system operates as follows:

        Function Operation Condition
        Door Unlock-linked

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


        • The power switch is off.

        • Any door has been unlocked by wireless unlock function.

        • All doors are closed.
        Door Lock-linked

        When one of the following conditions is met, the clearance lights and taillights automatically turn off:


        • All doors are locked.

        • All doors are closed.

    6. 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


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

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

      3. The headlight leveling ECU assembly 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 (IG), it executes the initial setting of the stepper motors.

    2. 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.

          A0002I5E23
          *1 800 m (2625 ft.)
          *2 Delay
          *3 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.

          A0002HEE19
          *1 600 m (1969 ft.)
          *2 Delay
          *3 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. HID Headlight System


      1. Discharge Bulb


        • Instead of the filament contained in an incandescent bulb, a discharge bulb contains an arc tube, which is filled with xenon gas and metal halide.

          A00035Q

    2. Automatic High Beam System


      1. Lane Departure Warning Camera (Automatic High Beam Sensor)


        • The lane departure warning camera consists of a Complementary Metal Oxide Semiconductor (CMOS) camera that receives images and the mirror portion that identifies light sources and judges whether to use high beams or low beams.

          A00033VE03
          Text in Illustration
          *1 Lane Departure Warning Camera *2 Camera Portion

  5. FAIL-SAFE


    1. HID 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 normal operating voltage (9 to 16 V), the light control ECU stops illuminating the headlight. It resumes illuminating the headlight once the voltage reverts to the normal operating voltage. However, if the input voltage decreases after the headlights have illuminated, the headlights will remain illuminated until the input voltage becomes insufficient to light the bulbs.
        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 the power is reinstated. Power is reinstated by turning the light control switch from off to on.
        Bulb Open Circuit If a bulb is not inserted in its socket, the light control ECU stops generating high voltage until the bulb is inserted correctly and the power is reinstated. Power is reinstated by turning the light control switch from off to on or turning the power switch from off to on (IG).

    2. Automatic Headlight Beam Level Control System


      1. If an abnormal condition such as those listed below is detected, the headlight leveling ECU assembly operates in fail-safe mode. The headlight leveling ECU assembly illuminates the headlight leveling warning light in the combination meter assembly when an abnormality in the rear height control sensor sub-assembly is detected.

        Trouble Area Condition Fail-safe Operation
        Rear Height Control Sensor Sub-assembly Signal level abnormality Holds the beam at the position of the headlight leveling actuator when abnormality is detected.
        Headlight Leveling Motor Open or short circuit

        Combination Meter Assembly

        - Vehicle Speed Signal

        		 Vehicle speed signal pulse abnormality
        Headlight Leveling ECU Assembly Voltage abnormality

  6. DIAGNOSIS


    1. Automatic Headlight Beam Level Control System


      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.

    2. 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.