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Home >> Lexus >> 2018 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Blind Spot Monitor System - Diagnostics - Introduction >> Blind Spot Monitor System >> System Description [12/2017 - 10/2020] >> System Description [12/2017 - 10/2020]

System Description [12/2017 - 10/2020]

  1. GENERAL 
    1. The blind spot monitor system has a blind spot monitor function.
      1. Blind spot monitor function
        • The blind spot monitor function is a function that assists the driver when changing lanes.

          This function uses quasi-millimeter wave radar to detect vehicles that are traveling in adjacent lanes in the areas that are not visible using the outer rear view mirror assemblies (blind spots) and vehicles that are approaching rapidly from up to 60 m behind this vehicle in the areas that are not visible using the outer rear view mirror assemblies (blind spots).

          The function advises the driver of the existence of a vehicle by illuminating the outer rear view mirror indicator on the outer mirror actuator assembly.

        • If the turn signal switch is operated while the outer rear view mirror indicator on an outer mirror actuator assembly is illuminated, the indicator starts blinking to give additional warning to the driver.
  2. FUNCTION OF COMPONENTS 
    Component Function
    Blind Spot Monitor Sensor
    • Consists of a 24 GHz radar module and an integrated processing module.
    • Illuminates or blinks the outer rear view mirror indicator on the outer mirror actuator assembly.
    • Sounds the RCTA buzzer (blind spot monitor buzzer) when the RCTA function is operating.
    • Changes the outer rear view mirror indicator on the outer mirror actuator assembly from illuminated to blinking when a turn signal switch operation signal is received from the combination meter assembly with the blind spot monitor function operating.
    • Dims the outer rear view mirror indicator on the outer mirror actuator assembly.
    Outer Mirror Actuator Assembly
    - Outer Mirror (Outer Rear View Mirror Indicator)    		 Turns on or blinks the indicator based on a signal from the blind spot monitor sensor.
    Steering Pad Switch Assembly Enables, disables or cuts off the operation of the blind spot monitor system by transmitting switch operation signals to the combination meter assembly.
    RCTA Buzzer (Blind Spot Monitor Buzzer) Sounds based on a signal from the blind spot monitor sensor.
    Combination Meter Assembly
    - Multi-information Display
    • Transmits the ON/OFF signal to the blind spot monitor sensor RH.
    • Transmits a turn signal switch operation signal from the headlight dimmer switch assembly to the blind spot monitor sensor via CAN communication.
    • Displays an error message on the multi-information display if the blind spot monitor detects a malfunction while it is operating.
    • Illuminates to inform the driver while the blind spot monitor system power is on (the engine switch is on (IG) and the combination switch assembly [blind spot monitor system] is on)
    • Transmits the customize information on the multi-information display to the blind spot monitor sensor RH.
    Main Body ECU (Multiplex Network Body ECU) Transmits the destination information and the dimmer signal to the blind spot monitor sensor via CAN communication.
    Skid Control ECU Assembly*1
    Brake Actuator Assembly (Skid Control ECU)*2    		 Transmits the vehicle speed signal to the blind spot monitor sensor via CAN communication.
    ECM Transmits the shift position signal (R) to the blind spot monitor sensor via CAN communication.
    Steering Sensor Detects the angle of the steering wheel and transmits the resulting signals to the blind spot monitor sensor via CAN communication.
    Yaw Rate Sensor Transmits the yaw rate signal to the blind spot monitor sensor via CAN communication.
    Television Camera Assembly Receives the blind spot monitor sensor information via CAN communication and sends it to the multi-display.
    Multi-display Receives the video signals from the television camera assembly and displays RCTA icon on the display panel.
    Front Steering Control ECU*3 Transmits a VGRS relative angle signal to the blind spot monitor sensor via CAN communication.

    *1: w/o Bacuum Brake Booster

    *2: w/ Bacuum Brake Booster

    *3: w/ Variable Gear Ratio Steering System

  3. OPERATION DESCRIPTION 
    1. Operation description of the blind spot monitor function
      1. Operation conditions:
        • The blind spot monitor system is on.
        • The shift position is in any other than R.
        • Vehicle speed is more than approximately 16 km/h (10 mph).
      2. Conditions in which a sensor can detect a vehicle

        The blind spot monitor function indicates detection of a vehicle in the detection area when either condition is met:

        • When a vehicle is detected in an adjacent lane overtaking this vehicle.
        • When a vehicle is detected entering the detection area because it changed lanes.

        HINT: 

        The greater the difference in speed between the vehicle and the detected vehicle is, the farther away the other vehicle will be when the notification is given.

      3. Detection area

        Vehicles in the following areas can be detected:

        GTY759709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Within approximately 3.5 m (11.48 ft.) from Side of Vehicle
        *b Within approximately 0.5 m (1.64 ft.) from Side of Vehicle
        *c Within approximately 1 m (3.28 ft.) Forward of Rear Bumper
        *d Within approximately 3 m (9.84 ft.) Behind Rear Bumper
        *e Within approximately 3 m (9.84 ft.) to 60 m (196.86 ft.) from Rear Bumper
        Detection Area (for Vehicle in Blind Spot)
        Detection Area (for Rapidly Approaching Vehicle from Behind)
  4. OPERATION OF OUTER REAR VIEW MIRROR INDICATOR 
    1. Initial check
      1. When the blind spot monitor system is turned on with the engine switch on (IG), the outer rear view mirror indicators on the outer mirror actuator assembly illuminate for 3 seconds.
      2. When the engine switch is turned from off to on (IG) with the blind spot monitor system on, the outer rear view mirror indicators on the outer mirror actuator assembly illuminate for 3 seconds.
    2. Operation for each function
      1. Operation for blind spot monitor function
        • When a sensor detects a vehicle in the blind spot area or a vehicle is rapidly approaching the blind spot from behind the vehicle, the outer rear view mirror indicator on the outer mirror actuator assembly illuminates.
        • If the turn signal switch is operated, while the sensor is detecting a vehicle in the detection area and the outer rear view mirror indicator on the outer mirror actuator assembly is illuminated, the indicator starts blinking as shown in the illustration.
        GTY757296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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