LIGHTING SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


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

      Component Function
      Headlight Swivel ECU Assembly

      • Receives high beam actuation signals from the automatic high beam sensor using LIN communication (for automatic high beam actuation).

      • Acts as the gateway between the automatic high beam sensor and CAN (V bus).

      • Sends high beam actuation signals to the main body ECU (multiplex network body ECU) via CAN communication.
      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, the sensor sends high beam request signals to the headlight swivel ECU assembly using LIN communication.
      Back-up Light Switch Assembly*1 Outputs a back-up light on signal to the headlight swivel ECU assembly.
      ECM*2 Receives the shift position signals from the park/neutral position switch assembly and transmits it to the headlight swivel ECU assembly.
      Main Body ECU (Multiplex Network Body ECU)

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

      • Receives high beam request signals from the headlight swivel ECU assembly and transmits a signal to the head light assembly (headlight actuator).

      Brake Actuator Assembly

      - Skid Control ECU

      		 Outputs information about the speed of the wheel. This information is used by the automatic high beam control to control switching between the high beams and low beams of the automatic high beam system.
      Headlight Dimmer Switch Assembly Light Control Switch Transmits an AUTO position signal to the main body ECU (multiplex network body ECU).
      Dimmer Switch Transmits a 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).
      Airbag Sensor Assembly Outputs the yaw rate information.
      Combination Meter Assembly Automatic High Beam Indicator Light

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

      • Flashes to inform the driver when a malfunction is detected in this system.
      High Beam Indicator Light Illuminates to inform the driver when the high beams are on.
      Multi-information Display*3 When the headlight dimmer switch is not in the high beam position and the automatic high beam switch is on, then the multi-information display shows an advice message.

      *1: Models with manual transaxle or multi-mode manual transaxle

      *2: Models with multidrive/continuously variable transaxle

      *3: Models with dot LCD type multi-information display

  2. SYSTEM CONTROL


    1. The automatic high beam system operates as follows.

      Function Operation Condition
      Active

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


      • The ignition switch is ON.

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

      • 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).

      • 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.

  3. FUNCTION


    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.

      A00XRK5C02
      *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.

      A00XRG1C01
      *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. DIAGNOSIS


    1. When the headlight swivel ECU assembly or 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.