LIGHTING SYSTEM DETAILS


  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 integration relay.

      Engine Room Relay Block and Junction Block Assembly

      - Integration Relay

      		 Supplies power to the daytime running lights.
      Headlight Dimmer Switch Assembly Light Control ECU 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 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).

      • *: Models with smart entry and start system

    2. High Intensity Discharge (HID) Headlight System (Models with HID Headlights)

      Component Function
      Main Body ECU (Multiplex Network Body ECU) Receives the light control switch signal and transmits a signal to the H-LP 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 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 30000 V and applies it to the discharge bulbs in order to illuminate them.
      H-LP Relay Supplies power to the light control ECUs.

    3. Intelligent Adaptive Front-lighting System (AFS) (Models with Intelligent Adaptive Front-lighting System)

      Component Function
      Combination Meter Assembly AFS OFF Indicator Light

      • Illuminates when the AFS control is stopped by the headlight swivel main switch.

      • Flashes when the headlight swivel ECU assembly detects a malfunction.
      Headlight Assembly (LH, RH) Headlight Swivel Motor (LH, RH) Driven by the headlight swivel ECU assembly the headlight swivel motor moves the low beam left or right to the angle calculated by the headlight swivel ECU assembly.
      Steering Sensor

      • Detects the steering angle and direction and outputs this signal to the headlight swivel ECU assembly and the skid control ECU.

      • Outputs a zero point signal to the skid control ECU.

      Brake Actuator Assembly

      - Skid Control ECU

      • Transmits the signals of the front RH and LH speed sensors to the headlight swivel ECU assembly.

      • Receives the zero point signal from the steering sensor and transmits it to the headlight swivel ECU assembly.
      ECM Transmits the engine running status signal to the headlight swivel ECU assembly.
      Airbag ECU Assembly Sends the detection signals from the yawrate sensor and acceleration sensor to the headlight swivel ECU assembly via CAN communication.
      Headlight Dimmer Switch Assembly Light Control Switch Transmits the headlight dimmer switch signal to the headlight swivel ECU assembly.
      Headlight Swivel Main Switch Operating this switch can enable or disable the operation of the intelligent AFS.
      Headlight Swivel ECU Assembly

      • Receives various signals, calculates the target lighting angle, and actuates the headlight swivel motor.

      • When the headlight swivel ECU assembly detects a malfunction, the headlight swivel ECU assembly flashes the AFS OFF indicator light.

    4. Automatic Headlight Beam Level Control System (Models with Automatic Headlight Beam Level Control System)

      Component Function
      Headlight Leveling ECU Assembly*1

      • 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 Swivel ECU Assembly*2
      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*1 or headlight swivel ECU assembly*2, 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 light control signal and transmits it to the headlight leveling ECU assembly*1 or headlight swivel ECU assembly*2.
      Rear Height Control Sensor Sub-assembly Detects vehicle movement and transmits a signal to the headlight leveling ECU assembly.
      Combination Meter Assembly Multi-information Display*1 Displays a warning message to inform the driver when the headlight leveling ECU assembly detects a malfunction in this system.
      AFS OFF Indicator Light*2 Flashes to inform the driver when the headlight swivel ECU assembly detects a malfunction in this system.

      • *1: Models without intelligent Adaptive Front-lighting System

      • *2: Models with intelligent Adaptive Front-lighting System

    5. 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.
      H-LP Relay Supplies power to the headlight assembly.

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

      Component Function
      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 a signal to the integration relay.

      Inner Rear View Mirror Assembly

      - Automatic High Beam Sensor

      		 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).

      Engine Room Relay Block and Junction Block Assembly

      - Integration Relay

      		 Supplies power to the high beams.
      H-LP Relay Supplies power to the low beams.
      Skid Control ECU Outputs information about the average speed of the 4 wheels. This information is used by the automatic high beam sensor to control switching between the high and low beams of the automatic high beam system.
      ECM Outputs a signal to indicate that the shift lever is in R. Based on this signal, the automatic high beam sensor determines the direction of vehicle movement.
      Headlight Dimmer Switch Assembly Light Control Switch Transmits an AUTO position or high beam position signal to the main body ECU (multiplex network body ECU).
      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.

    7. 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 Relay Block and Junction Block Assembly

      - Integration Relay

      		 Supplies power to the high beams.
      H-LP Relay Supplies power to the low beams.
      TAIL Relay Supplies power to the taillights, clearance lights/daytime running lights and license plate lights.
      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 are on.

      • *: Models with smart entry and start system

    8. 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 sent from the door control receiver.
      H-LP Relay Shuts down power to the low beams.

      Engine Room Relay Block and Junction Block Assembly

      - Integration Relay

      		 Shuts down power to the high beams and front fog lights.
      TAIL Relay Shuts down power to the taillights, clearance lights/daytime running 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, 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)
      Luggage Compartment Door Courtesy Light Switch Assembly

      Front Door Lock with Motor 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 smart entry and start system

  2. OPERATING CONDITION


    1. Daytime Running Light System


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


        • The ignition switch is ON.

        • An engine speed signal is input (engine running).

        • The headlight dimmer switch assembly is in the auto or off position.

        • The tail lights are not on.

        • The parking brake is off.

    2. Intelligent Adaptive Front-lighting System (AFS) (Models with Intelligent Adaptive Front-lighting System)


      1. The intelligent AFS operates when all of the following conditions are met:


        • Engine is running.

        • Vehicle is moving forward at a speed of 10 km/h (6 mph) or more.

        • Steering angle is 6° or more.

        • Headlight is operating in low beam.

        • AFS is on.

    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 ignition switch is turned to ACC or off.

        • The driver door is opened.

  3. FUNCTION


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


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

      2. The headlight leveling ECU assembly*1 or headlight swivel ECU assembly*2 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*1 or headlight swivel ECU assembly*2 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*1 or headlight swivel ECU assembly*2 detects that the vehicle is stopped and the ignition switch is ON, it executes the initial setting of the stepper motors.


        • *1: Models without intelligent Adaptive Front-lighting System (AFS)

        • *2: Models with intelligent Adaptive Front-lighting System (AFS)

    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.

          A01FCJAE08

          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.

          A01FD2UE07

          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 (Models with HID Headlights)


      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.

          A01FD7N

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


      1. Inner Rear View Mirror Assembly (Automatic High Beam Sensor)


        • The inner rear view mirror assembly 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 the high beams or low beams.

          A01FD3XE01
          Text in Illustration
          *a Reference only: Camera cannot be disassembled. - -

  5. FAIL-SAFE


    1. HID Headlight System (Models with HID Headlights)


      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 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 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 ignition switch from off to ON.

    2. Intelligent Adaptive Front-lighting System (AFS) (Models with Intelligent Adaptive Front-lighting System)


      1. If the headlight swivel ECU assembly detects a malfunction in the intelligent AFS, it will take the actions indicated in the table below and flash the AFS OFF indicator light to inform the driver of the malfunction.

        Malfunctioning Area System Operation
        Headlight Swivel Motor

        • Stops operating after returning to the initial position (if failure occurs at higher than the initial position).

        • Stops the operation at current condition (if failure occurs at lower than the initial position).
        Steering Sensor Stops operating after returning to the initial position.
        Speed Sensors
        Rear Height Control Sensor Sub-assembly
        Main Body ECU (Multiplex Network Body ECU)
        ECM
        Skid Control ECU

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


      1. If an abnormal condition such as those listed below is detected, the headlight leveling ECU assembly*1 or headlight swivel ECU assembly*2 operates in fail-safe mode.


        • The headlight leveling ECU assembly displays the warning message in the combination meter assembly when an abnormality in the rear height control sensor sub-assembly is detected.*1

        • The headlight swivel ECU assembly flashes the AFS OFF indicator light in the combination meter assembly when an abnormality in the rear height control sensor sub-assembly is detected.*2

        Malfunctioning Area Condition Fail-safe Operation
        Rear Height Control Sensor Sub-assembly Signal level abnormality Holds the beam at the position of the headlight 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*1 Voltage abnormality
        Headlight Swivel ECU Assembly*2

        • *1: Models without intelligent Adaptive Front-lighting System (AFS)

        • *2: Models with intelligent Adaptive Front-lighting System (AFS)

  6. DIAGNOSIS


    1. Intelligent Adaptive Front-lighting System (AFS) (Models with Intelligent Adaptive Front-lighting System)


      1. If the headlight swivel ECU assembly detects a malfunction in the intelligent AFS, the headlight swivel ECU assembly flashes the AFS OFF indicator light in order to alert the driver. At the same time, the DTCs are stored in memory. The DTCs can be read by using the Global TechStream (GTS). For details, refer to the Repair Manual.

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


      1. When the headlight leveling ECU assembly detect 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) detect 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.