LIGHTING SYSTEM DETAILS

  1. FUNCTION OF MAIN COMPONENTS

    1. Daytime Running Light System

      Component Function
      Main Body ECU The main body ECU receives various signals and illuminates the low beam headlights, taillights, clearance lights, and license plate 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.
      ECM The ECM outputs an engine speed signal and transmits it to the main body ECU.

    2. Automatic Light Control System

      Component Function
      Main Body ECU The main body ECU receives various signals and illuminates the headlights, taillights, clearance lights, and license plate lights.
      Headlight Dimmer Switch Assembly Light Control Switch The light control switch transmits an AUTO position signal to the main body ECU.
      Light Control Sensor The light control sensor detects the ambient light level.

    3. HID Headlight System

      Component Function
      Main Body ECU The main body ECU receives the HEAD position signal and transmits a signal to the light control ECU.
      Headlight Dimmer Switch Assembly Light Control Switch The light control switch transmits a HEAD position signal to the main body ECU.
      Headlight Unit Light Control ECU The light control ECU transforms battery voltage to a high voltage of up to 22000 V and applies it to the discharge bulbs in order to illuminate them.
      Discharge Bulb The discharge bulb light shines ahead over a broader area and further forward, increasing the area visible to the driver.

    4. Automatic Headlight Beam Level Control System

      Component Function
      Headlight Unit Headlight Leveling Motor

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

      • Uses a step motor to precisely regulate the angle of the reflectors.
      Rear Height Control Sensor Detects the height of the vehicle.
      Skid Control ECU Transmits the front speed sensor signal to the AFS ECU.
      ECM Transmits the engine running status signal to the AFS ECU.
      Main Body ECU Transmits the AFS ECU.
      Combination Meter Assembly Multi-information Display Displays a warning message on the multi-information display if a malfunction is detected by the AFS ECU.
      AFS Off Indicator Light If the system malfunctions, the meter ECU alerts the driver by blinking the AFS off indicator light in accordance with the signal from the AFS ECU.

    5. Intelligent AFS

      Component Function
      AFS ECU (Headlight Swivel ECU Assembly) The AFS ECU receives various signals, calculates the target lighting angle, and actuates the headlight swivel motor.
      Headlight Unit Headlight Swivel Motor

      • Driven by the AFS ECU, the motor moves the low beam left or right to the angle calculated by the AFS ECU.

      • A step motor is used for the headlight swivel motor. The AFS ECU determines the low beam angle based on the number of steps (position) of the step motor.
      Steering Angle Sensor Detects the steering angle and direction and outputs this signal to the AFS ECU.
      Skid Control ECU Transmits the front speed sensor signal to the AFS ECU.
      ECM Transmits the engine running status signal to the AFS ECU.
      Main Body ECU Transmits the headlight status signal.
      Combination Meter Assembly Multi-information Display Operation/non-operation of the intelligent AFS can be selected on the multi-information display. Settings are changed by operating the multi-information switch.
      AFS Off Indicator Light

      • If the system malfunctions, the meter ECU blinks the AFS off indicator light based on the signal from the AFS ECU to alert the driver.

      • When non-operation of the intelligent AFS is selected, the AFS ECU illuminates the AFS off indicator light to inform the driver that the system is not operating.
      Multi-information Switch (Steering Pad Switch Assembly) Menu Switch The menu switch is pressed to change the multi-information display to the multi-function switch display.
      ENTER Switch Intelligent AFS can be switched on or off using the ENTER switch.

    6. Emergency Brake Signal

      Component Function
      Skid Control ECU Manages signals from each sensor and sends the operation signal of the emergency brake signal to the stop light control ECU assembly.
      Yaw Rate Sensor Detects vehicle acceleration and sends the information to the skid control ECU.
      Speed Sensor Detects the wheel speed of each of the 4 wheels.
      Stop Light Switch Assembly Detects the brake pedal depressing signal.
      Hazard Warning Signal Switch Assembly Sends the operation signal of the hazard warning light to the skid control ECU and the hazard warning light.
      Hazard Warning Light Blinks when a signal is received from the hazard warning signal switch assembly.
      Stop Light Control ECU Assembly The stop light and high mount stop light are made to blink in accordance with the hazard warning light and the operation signal of the emergency brake signal from the skid control ECU.
      Rear Combination Light Assembly Stop Light Blinks when a signal is received from the stop light control ECU assembly.
      High Mount Stop Light

  2. OPERATING CONDITION

    1. Daytime Running Light System

      1. Daytime running light system is enabled when the conditions given below are met:

        Condition Ignition switch (engine switch*) is ON.
        Light control switch OFF or AUTO position (when taillight is not being controlled by the automatic light control).
        Engine is running.

        • *: Models with entry and start system

    2. Intelligent AFS

      1. The AFS ECU performs when all the following conditions are fulfilled:

        Condition 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 (except when the daytime running light system is operating).
        AFS is on.

    3. Light Automatic Turn-off System

      1. The light automatic turn-off system performs when the following conditions are met:

        Function Destination Light Control Switch Position Condition
        Without Turn-off Delay ALL Except OFF

        All lights will be turned off if the following condition is met while the lights (headlights, front fog lights*1, rear fog lights*2 and taillights) are turned on:

        • The ignition switch (engine switch*3) is turned from ON to off and the driver door is open.
        With Turn-off Delay Europe AUTO

        All lights will be turned off after 30 seconds if the following condition is met while the lights (headlights, front fog lights*1, rear fog lights*2 and taillights) are turned on:

        • The ignition switch (engine switch*3) is turned from ON to off and any of all doors, back door and glass hatch is open.
        HEAD or TAIL

        The headlights and front fog lights will be turned off if the following condition is met while the lights (headlights, front fog lights*1, rear fog lights*2 and taillights) are turned on:

        • The ignition switch (engine switch*3) is turned from ON to off.
        Except Europe AUTO or TAIL

        All lights will be turned off if the following condition is met while the taillights are turned on:

        • The ignition switch (engine switch*3) is turned from ON to off and the driver door is open.
        AUTO or HEAD

        All lights will be turned off after 30 seconds if the following condition is met while the headlights are turned on:

        • The ignition switch (engine switch*3) is turned from ON to off and any of all doors, back door and glass hatch is open and closed.

        • *1: Models with front fog light

        • *2: Models with rear fog light

          *3: Models with entry and start system

  3. SYSTEM CONTROL

    1. Intelligent AFS

      1. The AFS ECU calculates the swivel angle from the steering angle and drives the headlight swivel motor on the side facing into the turn to illuminate the road ahead during cornering.

        Driving Condition Headlight Unit
        Left Right
        LHD Right Turn 0° Fixed 0° to 10° to Right
        Left Turn 0° to 15° to Left 0° Fixed
        RHD Right Turn 0° Fixed 0° to 15° to Right
        Left Turn 0° to 10° to Left 0° Fixed

      2. Initial Set Control

        • When the engine is started, the AFS ECU drives the headlight swivel motor, moves the projector headlight to the operation limit in the direction toward the vehicle center and then returns it to the proper position. The AFS ECU thus assesses the position of the headlight for reference control.

  4. FUNCTION

    1. HID Headlight System

      1. The HID headlight system consists of discharge bulbs and light control ECUs.

      2. Light control ECU transforms the voltage that is input from the battery to a high voltage of up to 22000 V and applies it to the discharge bulbs in order to illuminate them.

      3. A fail-safe function is provided as a countermeasure against the high voltage generated when a problem occurs in the headlight system.

    2. Automatic Headlight Beam Level Control System

      1. The automatic headlight beam level control system mainly consists of the AFS ECU, rear height control sensor, and two headlight leveling motors.

      2. The AFS ECU calculates changes in the vehicle posture based on the signals from the rear height control sensor.

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

      4. Initial Set Control

        • When the engine is started, the AFS ECU drives the headlight leveling motor, moves the headlight reflector to the lower limit position and returns it to the proper position. The AFS ECU thus assesses the position of the headlight for reference control.

  5. 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.

        A008HEUE01
        Text in Illustration
        *1 Arc Tube *2 Lead Wire
        *3 Ceramic Pipe - -

      2. Discharge bulbs have the following advantages:

        • The light emitted by the bulb is close in color to sunlight. The light shines ahead over a broader area and further forward, increasing the area visible to the driver.

        • Less power is consumed.

  6. OPERATION

    1. Emergency Brake Signal

      1. The operating and ending conditions for the emergency brake signal are listed below. When the emergency brake signal operates, the skid control ECU causes the stop light control ECU assembly to blink the stop lights. When the emergency brake signal ends, the skid control ECU causes the stop light control ECU assembly to end the blinking of the stop lights.

        Emergency Brake Signal Operating Condition

        Activates when all of the following conditions are satisfied:

        • The vehicle speed is 55 km/h (34 mph) or more.

        • The system judges from a depression of the brake pedal and a drop in vehicle speed that emergency braking is occurring.
        Emergency Brake Signal Ending Conditions

        Stops the operation when any of the following conditions is met:

        • The system judges from the vehicle's deceleration that no emergency braking is occurring.

        • The hazard warning light is blinking.

        • The brake pedal is released.

  7. 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
        Detection of Abnormal Input Voltage If the voltage input to the light control ECU deviates from the normal operating voltage (10 V to 16 V), the light control ECU stops illuminating the headlights. It resumes illuminating the headlights once the voltage reverts to the operating voltage range. However, if the input voltage decreases after the headlights have illuminated, the headlights will remain illuminated until the input voltage is insufficient to light the bulbs.
        Detection of Abnormal Output (Open Circuit or Short Circuit) If an abnormal condition (open or short) occurs in the voltage that is output by 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 light control switch from off to on.
        Detection of Bulb Open If a bulb has not been inserted into the socket, the light control ECU stops producing a high voltage 1 second after the power has been turned on. The light control ECU will maintain this state until a bulb is correctly inserted and the power is reinstated by turning the light control switch from off to on.

    2. Automatic Headlight Beam Level Control System

      1. If the AFS ECU detects a malfunction in the automatic headlight beam level control system or intelligent AFS, it will take the actions indicated in the table below:

        Trouble Area Condition (Fail-safe Control for Automatic Headlight Beam Level Control) AFS Off Indicator Light
        Headlight Swivel Motor Malfunction Continues to control until a position of 0.7° less than the current position is reached. Blinks
        Steering Angle Sensor Signal Malfunction Continues to control. Blinks
        Speed Sensor Signal Malfunction Continues to control Blinks
        Height Control Sensor Signal Malfunction

        • Stops the operation after returning to initial position (fails at higher than initial position).

        • Stops the operation in current condition (fails at lower than initial position).

        		 Blinks
        Headlight Leveling Motor Malfunction

        Normal Side Headlight Leveling Motor:

        • Stops the operation after returning to initial position (fails at higher than initial position).

        • Stops in current condition (fails at lower than initial position).

        		 Blinks

        Abnormal Side Headlight Leveling Motor:

        • Stops in its current position.

        		 Blinks
        Communication Signal Malfunction Continues to control. Blinks

        Steering Angle Sensor:

        • Controls the system normally.

        		 Blinks

    3. Intelligent AFS

      1. If the AFS ECU detects a malfunction in the intelligent AFS or automatic headlight beam level control system, it will take the actions indicated in the table below:

        Trouble Area Condition (Fail-safe Control for Intelligent AFS) AFS Off Indicator Light
        Headlight Swivel Motor Malfunction

        Normal Side Headlight Swivel Motor:

        • Stops operating after returning to the initial position.

        		 Blinks

        Abnormal Side Headlight Swivel Motor:

        • Stops in its current position.

        		 Blinks
        Steering Angle Sensor Signal Malfunction Stops operating after returning to the initial position. Blinks
        Speed Sensor Signal Malfunction Stops operating after returning to the initial position. Blinks
        Height Control Sensor Signal Malfunction Stops operating after returning to the initial position. Blinks
        Headlight Leveling Motor Malfunction Stops operating after returning to the initial position. Blinks
        Communication Signal Malfunction

        Main Body ECU:

        • Stops operating after returning to the initial position.

        		 Blinks

        ECM:

        • Stops operating after returning to the initial position.

        		 Blinks

        Skid Control ECU:

        • Stops operating after returning to the initial position.

        		 Blinks

        Steering Angle Sensor:

        • Stops operating after returning to the initial position.

        		 Blinks

  8. DIAGNOSIS

    1. Automatic Headlight Beam Level Control System

      1. If the AFS ECU detects a malfunction in the automatic headlight beam level control system, the AFS ECU blinks the AFS off indicator light. At the same time, the Diagnostic Trouble Codes (DTCs) are stored in memory. The DTCs can be read by use of the intelligent tester II. For details, refer to the corresponding Repair Manual for this model.

    2. Intelligent AFS

      1. If the AFS ECU detects a malfunction in the intelligent AFS, the AFS ECU blinks the AFS off indicator light in order to alert the driver. At the same time, the DTCs are stored in the memory. The DTCs can be read by using the intelligent tester II. For details, refer to the corresponding Repair Manual for this model.