TOYOTA PARKING ASSIST-SENSOR SYSTEM(for 6 Sensor Type) SYSTEM DESCRIPTION


  1. GENERAL


    1. This system uses ultrasonic sensors to detect any obstacles at 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, 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 (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

    • Illuminates to inform the driver while the Toyota parking assist-sensor system power is on (the ignition switch is on 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 Toyota 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

    • 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
    ECM Transmits the shift position signal to the clearance warning ECU assembly

    • Navigation Receiver Assembly*1

    • Radio and Display Receiver Assembly*2

    		 Receives the ultrasonic sensor information from the clearance warning ECU assembly through the CAN communication line, and displays them on the multi-display

    • *1: for Navigation Receiver Type

    • *2: for Radio and Display Type

  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

      • Ignition switch is on.

      • 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).

      • Ignition switch is on.

      • Back sonar or clearance sonar switch assembly is on.

      • Shift lever is in R.
      Rear Corner

      • Ignition switch is on.

      • 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 navigation receiver assembly*1 or radio and display receiver assembly*2, 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.


      • *1: for Navigation Receiver Type

      • *2: for Radio and Display Type

      Tech Tips

      Refer to Detection Range Measurement and Display Inspection.

      Click here