TOYOTA PARKING ASSIST-SENSOR SYSTEM(for Hatchback) 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 by sounding a buzzer.

  2. FUNCTION OF COMPONENTS

    Component Function

    • No. 1 Ultrasonic Sensor

    • No. 2 Ultrasonic Sensor

    • No. 3 Ultrasonic Sensor

    		 Detects the distance between the vehicle and an obstacle

    • No. 1 Clearance Warning Buzzer

    • No. 2 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

    Brake Booster with Master Cylinder Assembly

    (Skid Control ECU)

    		 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

    • Sounds the buzzer
    Main Body ECU (Multiplex Network Body ECU) Transmits the illumination signal to the clearance warning ECU assembly
    Power Management Control ECU Transmits the shift state signal to the clearance warning ECU assembly
    Air Conditioning Amplifier Assembly Transmits the temperature information to the clearance warning ECU assembly

  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

      • Power switch is on (IG).

      • Back sonar or clearance sonar switch assembly is on.

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

      • Vehicle speed is approximately 10 km/h (6 mph) or less.

      • Power switch is on (IG).

      • Back sonar or clearance sonar switch assembly is on.

      • Reverse (R) has been selected.
      Rear

      • Power switch is on (IG).

      • Back sonar or clearance sonar switch assembly 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 multi-information display and the clearance warning buzzers. The approximate 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