LEXUS PARKING ASSIST-SENSOR SYSTEM SYSTEM DESCRIPTION


  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 (in the combination meter assembly) and multi-display (w/ Multi-display) and by sounding a buzzer.

  2. FUNCTION OF COMPONENTS

    Component Function
    No. 1 Ultrasonic Sensor (6) 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 LEXUS parking assist-sensor system power is on (the power switch is on (IG) and the clearance sonar main switch is on)
    Combination Meter Assembly Transmits the vehicle speed signal to the clearance warning ECU assembly
    Clearance Sonar Main Switch Operating this switch enables, disables or cuts off the operation of the LEXUS parking assist-sensor 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 and multi-media module receiver assembly*1

    • Judges the approximate distance between the vehicle and an obstacle based on the signals from the ultrasonic sensors and sounds the buzzer
    Main Body ECU (Multiplex Network Body ECU) Transmits the destination information to the clearance warning ECU assembly
    Power Management Control ECU Transmits the shift state signal to the clearance warning ECU assembly
    Multi-media Module Receiver Assembly*1

    • Receives the ultrasonic sensor information via CAN communication and sends it to the multi-display through the digital communication cable and the multi-media module wire

    • Transmits the customize information on the multi-display to the clearance warning ECU assembly
    Multi-display*1 Receives the display signals from the display and multi-media module receiver assembly*1 and displays them on the display panel.

    • *1: w/ Multi-display

  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 Sensor

      • Power switch is on (IG).

      • Clearance sonar main switch is on.

      • A shift state other than park (P) or reverse (R) has been selected.

      • Vehicle speed is less than approximately 10 km/h (6.2 mph).

      • Power switch is on (IG).

      • Clearance sonar main switch is on.

      • Reverse (R) has been selected.
      Rear Corner Sensor

      • Power switch is on (IG).

      • Clearance sonar main switch is on.

      • Reverse (R) has been selected.
      Rear Center Sensor

      • Power switch is on (IG).

      • Clearance sonar main switch is on.

      • Reverse (R) has been selected.

      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 indicator and the clearance warning buzzer. The appropriate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds.

      Tech Tips

      Refer to Detection Range Measurement and Display Inspection Click here.