LEXUS PARKING ASSIST-SENSOR SYSTEM SYSTEM DESCRIPTION


  1. GENERAL


    1. This system uses No. 1 ultrasonic sensors to detect any obstacles at the corners and the front 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 multi-information display (in the combination meter assembly) and multi-display assembly (w/ Multi-display) 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 in the Combination Meter Assembly

    • Displays the location of an obstacle and the approximate distance between the vehicle and the obstacle

    • Displays a malfunction of the No. 1 ultrasonic sensor to inform the driver
    Clearance Sonar Indicator in the Combination Meter Assembly Illuminates to inform the driver while the LEXUS parking assist-sensor system power is on (the engine 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

    Back Sonar or Clearance Sonar Switch 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 No. 1 ultrasonic sensors and sends it to the multi-information display and multi-media module receiver assembly*1

    • Sounds the buzzer
    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
    Multi-media Module Receiver Assembly*1

    • Receives the No. 1 ultrasonic sensor information through CAN communication 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
    Multi-display Assembly*1 Receives the video signals from the multi-media module receiver assembly and displays them on the display panel.

    • *1: w/ Multi-display

  3. OPERATION EXPLANATION


    1. The operating conditions of each No. 1 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).

      • Clearance sonar main switch is on.

      • Shift position is in any position except P or R.

      • Vehicle speed is less than approximately 10 km/h (6.2 mph). The sensors stop operating when the vehicle speed exceeds 15 km/h (9.3 mph), and start operating when the vehicle speed drops below 10 km/h (6.2 mph).

      • Engine switch is on (IG).

      • Clearance sonar main switch is on.

      • Shift lever is in R.
      Front Center

      • Engine switch is on (IG).

      • Clearance sonar main switch is on.

      • Shift position is in any position except P or R.

      • Vehicle speed is less than approximately 10 km/h (6.2 mph). The sensors stop operating when the vehicle speed exceeds 15 km/h (9.3 mph), and start operating when the vehicle speed drops below 10 km/h (6.2 mph).
      Rear Corner

      • Engine switch is on (IG).

      • Clearance sonar main switch is on.

      • Shift lever is in R.
      Rear Center

      • Engine switch is on (IG).

      • Clearance sonar main switch is on.

      • Shift lever is in R.

      When the system operates, the clearance warning ECU assembly 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 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.