LEXUS PARKING ASSIST-SENSOR SYSTEM SYSTEM DESCRIPTION


  1. GENERAL


    1. When the vehicle is driven at 9 km/h (5.8 mph) or less, the ultrasonic sensors detect any obstacles at the corners and rear of the vehicle. The system then informs the driver of the distance between the sensors and the obstacles as well as their positions by indicating them on the combination meter assembly and by sounding a buzzer.

  2. FUNCTION OF COMPONENTS

    Components Function

    • No. 1 ultrasonic sensor

    • No. 2 ultrasonic sensor

    • No. 3 ultrasonic sensor

    		 No. 1 ultrasonic sensor sends and receives ultrasonic waves. Based on received wave, sensor calculates the approximate distance value between vehicle and obstacle, and sends distance value as a signal to clearance warning ECU assembly.
    Combination meter assembly

    • Displays the location of an obstacle and the approximate distance between the vehicle and obstacle. Turns the LEXUS parking assist-sensor system on and off.

    • Emits an intermittent sound to inform the driver that ECU has detected an obstacle within prescribed ranges.
    Main switch assembly (clearance sonar main switch) Outputs system ON/OFF signals to clearance warning ECU assembly.
    Clearance warning ECU Assembly

    • Receives signals from the No. 1 ultrasonic sensors and sends the display signal to the combination meter assembly and accessory meter assembly.

    • Receives signals from the No. 1 ultrasonic sensors and sends buzzer signal to No. 1 clearance warning buzzer.
    Multi-media module receiver assembly

    • Receives the ultrasonic sensor information via CAN communication line and sends it to the accessory meter assembly through the digital communication cable.

    • Transmits the customize information on the accessory meter assembly to the clearance warning ECU assembly.

    • Sends the temporary mute setting signal and clearance sonar setting screen information to the clearance warning ECU assembly via CAN communication.
    Accessory meter assembly

    Receives the information from the clearance warning ECU assembly through the CAN, and then displays the detection information.

    Receives the video signals from the rear television camera assembly, and displays them on the display panel
    No. 1 clearance warning buzzer Sounds the buzzer to inform the driver according to the distance to the obstacle.
    Main body ECU (multiplex network body ECU) Transmits destination symbol, dimmer signal and steering wheel symbol to clearance warning ECU assembly.
    ECM Transmits shift position signal to clearance warning ECU assembly.

  3. OPERATION EXPLANATION


    1. The ECU determines whether the LEXUS parking assist-sensor system should be operated based on the main switch assembly (clearance sonar main switch) on/off status, the shift position and the vehicle speed.

    2. When the system operates, the ECU transmits ultrasonic waves from the No. 1 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 ECU. Based on this information, the ECU sends signals to the multi-information display, the accessory meter and the No. 1 clearance warning buzzer. The approximate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds.

      Tech Tips

      Refer to "Operation Check" for the detailed operation Click here.