LIGHTING SYSTEM DETAILS


  1. FUNCTION OF MAIN COMPONENTS


    1. LED Headlight System

      Component Function
      LED Driver Module Supplies a constant current to the LED when power is supplied from the integration relay. Sends a normal illumination signal to the main body ECU while the headlight low beam is illuminated normally.
      Main Body ECU

      • Controls the integration relay which supplies power to the LED drive module.

      • Determines a failure in the LED headlight in accordance with the signal from the LED module and light control switch conditions and outputs a warning request signal to the combination meter assembly.
      Combination Meter Assembly Multi-information Display Receives the LED headlight warning request signal from the main body ECU and displays a warning message.

    2. Automatic Headlight Beam Level Control System

      Component Function
      Headlight Leveling ECU

      • The headlight leveling ECU detects changes in the vehicle movement based on the vehicle speed signals from the rear height control sensor and combination meter assembly.

      • Outputs control signal to the headlight leveling motor.

      • Provides initial set control, fail-safe function and diagnosis function.
      Headlight Assembly Headlight Leveling Motor

      • Based on the signals received from the headlight leveling ECU, the motors move the reflectors in the headlights.

      • Uses a headlight leveling motor to precisely regulate the angle of the reflectors.
      Rear Height Control Sensor Sub-assembly The rear height control sensor sub-assembly detects vehicle movement and transmits a signal to the headlight leveling ECU.
      Light Control Switch The light control switch transmits a HEAD position signal to the main body ECU.
      Main Body ECU The main body ECU receives HEAD position signals from the light control switch and sends headlight status signals to the headlight leveling ECU.
      Combination Meter Assembly Headlight Leveling Indicator Light When the system malfunctions, the combination meter assembly alerts the driver by illuminating the headlight leveling indicator light in accordance with the signals from the headlight leveling ECU.

    3. Automatic Light Control System

      Component Function
      Automatic Light Control Sensor The automatic light control sensor detects the ambient light level.
      Light Control Switch The light control switch transmits an AUTO position signal to the main body ECU.
      Main Body ECU The main body ECU receives signals from the automatic light control sensor and AUTO position signals from the light control switch, and illuminates the headlights, taillights, parking lights and license plate lights.
      Engine Room Relay Block Integration Relay The integration relay supplies power to the headlight low beams.
      Instrument Panel Junction Block Assembly Taillight Relay The taillight relay supplies power to the taillights, parking lights and license plate lights.
      Combination Meter Assembly Taillight Indicator Light The taillight indicator lights up to inform the driver when the taillights turn on.

    4. Light Auto Turn-OFF System

      Component Function
      Main Body ECU The main body ECU receives various signals, and turns off the exterior lights.
      Door Courtesy Light Switch (Driver) The door courtesy light switch detects whether driver's door is open or closed and transmits a signal to the main body ECU.
      Engine Room Relay Block Integration Relay The integration relay supplies power to the headlight low beams.
      Instrument Panel Junction Block Assembly Taillight Relay The taillight relay supplies power to the taillights, parking lights and license plate lights.
      Foglight Relay The foglight relay shuts down the power to the front fog lights.
      Rear Foglight Relay The rear foglight relay shuts down the power to the rear fog lights.
      Light Control Switch The light control switch transmits a light control position signal to the main body ECU.

    5. Daytime Running Light System

      Component Function
      Main Body ECU Receives the READY signal from power management control ECU and outputs the daytime running light illumination signal.
      Power Management Control ECU The power management control ECU outputs the READY signal and transmits it to the main body ECU.
      Light Control Switch The light control switch outputs a light control signal and transmits it to the main body ECU.

    6. Light Reminder System

      Component Function
      Main Body ECU Outputs taillight illumination signals and driver's door open signals to the combination meter assembly.
      Door Courtesy Light Switch Driver's Door Sends driver's door open/close signals to the main body ECU.
      Combination Meter Assembly Receives taillight illumination signals and driver's door open signals from the main body ECU when the power switch is turned off, and sounds the buzzer.

  2. SYSTEM CONTROL


    1. LED Headlight System


      1. When the light control switch is turned ON, the LED driver modules immediately turn on the LEDs (approximately 0.1 sec). In addition, by regulating the output currents flowing into the LEDs at the specified level, the LED driver modules prevent the glare of light due to voltage variation.

      2. If malfunctions occur in the LED headlight system, an LED driver module transmits fail signals to the main body ECU. When the main body ECU receives fail signals, it transmits signals to the combination meter, warning the driver.

        A01J7SLE01

    2. Automatic Headlight Beam Level Control System


      1. The rear height control sensor sub-assembly RH detects a change in height of the rear shaft in response to the weight applied to the rear of the vehicle when the vehicle is stopped, and sends the change amount signal to the headlight leveling ECU. The headlight leveling ECU calculates the vehicle posture based on the change amount and controls the headlight beam level by operating the headlight leveling motor.

        A01J7TDE01

    3. Automatic Light Control System


      1. When the power switch is on and the light control switch is in AUTO, the main body ECU simultaneously turns the headlight and the taillight on or off based on signals from the automatic light control sensor.

    4. Light Auto Turn-OFF System


      1. When the light control switch is in AUTO, the main body ECU turns off all the exterior lights based on the driver's door open signal after the power switch was turned off.

      2. When the light control switch is in HEAD or TAIL, the main body ECU turns off the headlights and front foglights if the power switch is turned off.

    5. Daytime Running Light System


      1. When the engine is running, the main body ECU receives light control switch signal (off) to control the illumination of the Low beam and taillights.

    6. Light Reminder System


      1. The light reminder system warns the driver using a buzzer when the combination meter assembly receives the driver's door courtesy light switch signal via the main body ECU and the power switch is turned off and the door is opened with the taillights kept on. The buzzer is located inside the combination meter.

        Light Control Switch Position Power Switch Door Buzzer
        Head or Tail Turn the power switch off. Open Sounds
        Closed Off

    7. Emergency Brake Signal


      1. When all of the following conditions are met, the Emergency Brake Signal starts operating:


        • Vehicle speed is above 55 km/h (34 mph)

        • Driver is depressing the brake pedal

        • Emergency braking is detected from the vehicle deceleration

      2. When any of the following conditions is met, the Emergency Brake Signal stops operating:


        • Driver has released the brake pedal

        • Emergency braking is no longer detected from the vehicle deceleration

        • Driver has pressed the hazard warning switch

  3. CONSTRUCTION


    1. LED Headlight System


      1. The LED headlight system is used for the low beams, and this consists of the 2 projector type LED lights.

        A01J844E01

      2. The light from the 2 projector type LED lights are reflected by the reflector and passes through the projector, illuminating an area in the distance. At this time, the illuminated area is optimized by the shape of the reflectors and projector.

        A01J81XE01
        Text in Illustration
        *1 Headlight Assembly *2 Reflector
        *3 LED - -
        *a A-A Cross Section - -

    2. LED Driver Module


      1. The LED driver modules are placed beneath the headlights, and this supplies a constant voltage to the low beams and reduces the changes in the energization current.

        A01J81IE01
        Text in Illustration
        *1 LED driver Module - -

    3. Stop Light Switch


      • The stop light switch contains a shaft, magnet, 2 magnet sensors and a circuit plate. The magnet is attached to the shaft.

      • When the brake pedal is depressed, the stop light switch shaft and magnet move at the same time. The magnet sensors on the circuit plate detect the extent of the magnet movement and output it in the form of on/off signals. One of the 2 magnet sensors is used for the stop light illumination signal, and the other for the cruise control cancel signal.

        Note

        Do not place magnets or magnetized objects close to the stop light switch. Placing magnets or magnetized objects close to the stop light switch may adversely affect the characteristics of the switch.

      A01J7SAE01

  4. FAIL-SAFE


    1. LED Headlight System


      1. The LED driver module executes the fail-safe actions listed below in accordance with the problem that has been detected.

        Problem Outline
        Detection of Abnormal Output (Open Circuit or Short Circuit) If an abnormal condition (open or short) occurs in the voltage that is output by LED driver module, the LED driver module stops illuminating the headlights and will maintain this state until the power is reinstated. Power is reinstated by turning the light control switch from OFF to ON.
        Detection of Abnormal Input Voltage If the voltage that is input to LED driver module deviates from the normal operating voltage (10 - 16 volts), the LED driver module stops illuminating the headlights. It resumes illuminating the headlights once the voltage reverts to the operating voltage range.

    2. Automatic Headlight Beam Level Control System


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

        Problem Outline
        Power Supply Voltage Malfunction Holds the beam at the position of the headlight leveling motor when the abnormality has been detected.
        Rear Height Control Sensor Sub-assembly Power Supply Malfunction
        Rear Height Control Sensor Sub-assembly Signal Malfunction

    3. Automatic Light Control System


      1. When the main body ECU detects a malfunction in the automatic light control sensor, it prohibits the control, however, the system maintains the current illumination state until the light control switch is turned to any positions other than AUTO or the power switch is turned off.

        Problem Outline
        Automatic Light Control Sensor Input Frequency Malfunction Determines that there is a malfunction in the automatic light control sensor if the output frequency from the automatic light control sensor lowers below a specified value when the automatic light control sensor power supply is turned on, and stops the control.

  5. DIAGNOSIS


    1. LED Headlight System


      1. If the main body ECU detects a malfunction in the LED headlight system, the main body ECU flashes the master warning light and indicates the warning message on the multi-information display. At the same time, the Diagnostic Trouble Code (DTC) is stored in memory. The DTC can be read using the intelligent tester. For details, refer to the Repair Manual.

    2. Automatic Headlight Beam Level Control System


      1. When the headlight leveling ECU detects malfunctions in the automatic headlight beam level control system, DTCs are stored in memory.

      2. The DTCs can be read using the intelligent tester. For details, refer to the Repair Manual.

    3. Automatic Light Control System


      1. When the main body ECU detects malfunctions in the automatic light control system, DTCs are stored in memory.

      2. The DTCs can be read using the intelligent tester. For details, refer to the Repair Manual.