TOYOTA PARKING ASSIST-SENSOR SYSTEM SYSTEM DESCRIPTION


  1. GENERAL


    1. This system uses No. 1 ultrasonic sensors to detect obstacles at the rear of the vehicle. If an obstacle is detected, the system then informs the driver of the distance between the sensor and obstacle 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
    Back sonar or clearance switch assembly

    • Operating this switch enables, disables or cuts off the operation of the Toyota parking assist-sensor system.

    • Illuminates to inform the driver while the Toyota parking assist-sensor system is on (the ignition switch to ON and the back sonar or clearance switch assembly is on).
    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 sounds the No. 1 clearance warning buzzer.

    Back-up light switch assembly*1

    Park/Neutral position switch assembly*2

    		 Transmits the shift lever R position signal to the clearance warning ECU assembly.
    TAIL Relay Transmits the tail relay ON signal to the clearance warning ECU assembly and the back sonar or clearance switch assembly.

    *1: for Manual Transmission

    *2: for Automatic Transmission

  3. OPERATION EXPLANATION


    1. The operating conditions of the No. 1 ultrasonic sensors are as follows.

      Installation Position Operating Condition
      Rear Center Sensor

      • Ignition switch to ON.

      • Back sonar or clearance switch assembly 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 No. 1 clearance warning buzzer. The approximate distance between the vehicle and the obstacle is then indicatedby the buzzer sounds.

      Tech Tips

      Refer to Detection Range Measurement Inspection.

      Click here