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Home >> Lexus >> 2023 >> RC F Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Intuitive Parking Assist System - Diagnostics - Introduction >> Intuitive Parking Assist System >> System Description [11/2017 - 03/2019] >> System Description [11/2017 - 03/2019]

System Description [11/2017 - 03/2019]

  1. GENERAL 
    1. This system uses ultrasonic sensors to detect any obstacles at the corners and the rear of the vehicle. The system then informs the driver of the distance between the sensors and an obstacle as well as their positions by indicating them on the multi-information display (on the combination meter assembly), multi-display (on the multi-display assembly) and by sounding a buzzer.
  2. FUNCTION OF COMPONENTS 
    Component Function
    No. 1 Ultrasonic Sensor Detects the distance between the vehicle and an obstacle
    No. 1 Clearance Warning Buzzer Sounds to inform the driver according to the distance to an obstacle
    Multi-information Display (on Combination Meter Assembly)
    • Displays the location of an obstacle and the approximate distance between the vehicle and the obstacle
    • Displays a malfunction of the ultrasonic sensor to inform the driver
    Clearance Sonar Indicator (on Combination Meter Assembly) Illuminates to inform the driver while the intuitive parking assist system power is on (the engine switch is on (IG) and the back sonar or clearance sonar switch assembly is on)
    Combination Meter Assembly Transmits the vehicle speed signal to the clearance warning ECU assembly
    Back Sonar or Clearance Sonar Switch Assembly Operating this switch enables, disables or cuts off the operation of the intuitive parking assist system
    Clearance Warning ECU Assembly
    • Judges the approximate distance between the vehicle and an obstacle based on the signals from the ultrasonic sensors, and sends it to the multi-information display, radio receiver assembly and rear television camera assembly
    • Judges the approximate distance between the vehicle and an obstacle based on the signals from the ultrasonic sensors and sounds the buzzer
    • Receives the temporary mute setting signal from the clearance warning ECU assembly via CAN communication
    Main Body ECU (Multiplex Network Body ECU) Transmits the destination information to the clearance warning ECU assembly
    ECM Transmits the shift position signal to the clearance warning ECU assembly
    Radio Receiver Assembly
    • Receives the ultrasonic sensor information via CAN communication line and sends it to the multi-display assembly through the digital communication cable
    • Transmits the customize information on the multi-display assembly to the clearance warning ECU assembly
    • Sends the clearance sonar setting screen information to the clearance warning ECU assembly via CAN communication
    Rear Television Camera Assembly Receives the ultrasonic sensor information via CAN communication and sends it to the multi-display assembly through the video signal cable
    Multi-display Assembly
    • Receives the video signals from the radio receiver assembly, and displays them on the display panel
    • Receives the video signals from the rear television camera assembly, and displays them on the display panel
  3. OPERATION EXPLANATION 
    1. The operating conditions of each ultrasonic sensor differ according to the installation position as shown in the table below.
      Installation Position Operating Condition
      Front Corner
      • Engine switch is on (IG).
      • Back sonar or clearance sonar switch assembly is on.
      • Shift lever in any position other than P or R.
      • Vehicle speed is less than approximately 10 km/h (6 mph). The sensors stop operating when the vehicle speed exceeds 15 km/h (9 mph), and start operating when the vehicle speed drops below 10 km/h (6 mph).
      • Engine switch is on (IG).
      • Back sonar or clearance sonar switch assembly is on.
      • Shift lever is in R.
      Rear Corner
      • Engine switch is on (IG).
      • Back sonar or clearance sonar switch assembly is on.
      • Shift lever is in R.
      Rear Center

      When the system operates, the clearance warning ECU assembly transmits ultrasonic waves from the ultrasonic sensors. If these waves encounter an obstacle within one or more of the sensors ranges, the waves are reflected back to the sensors, which transmit them to the clearance warning ECU assembly.

      Based on this information, the clearance warning ECU assembly sends signals to the radio receiver assembly, the combination meter assembly and the No. 1 clearance warning buzzer. The approximate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds.

      HINT: 

      Refer to Detection Range Measurement and Display Inspection.

      Refer to OPERATION CHECK [11/2017 - 03/2019] 

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