TOYOTA PARKING ASSIST-SENSOR SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. The components have the following functions:

      Component Function
      No. 1 Ultrasonic Sensor Detects the distance between the vehicle and on obstacle.
      No. 1 Clearance Warning Buzzer Sounds to inform the driver according to the distance to the obstacle.
      Clearance Warning ECU Assembly

      • Judges the approximate distance between the vehicle and an obstacle based on signals from the No. 1 ultrasonic sensors.

      • Sounds the No. 1 clearance warning buzzer.
      IPA Main Switch Assembly Operating this switch allows the operation of Toyota parking assist-sensor system to be enabled or disabled.
      Park/Neatral Position Switch Assembly*1 Transmits the shift position signal to the clearance warning ECU assembly.
      Back-up Light Switch Assembly*2 Transmits the on/off signal of the back-up light switch assembly to the clearance warning ECU assembly.

      *1: Models with automatic transmission

      *2: Models with manual transmission

  2. OPERATING CONDITION


    1. The operating condition of each sensor differs according to its installed position as shown in the table below:

      Installation Position Operating Condition
      Rear Center

      • Ignition switch is ON.

      • IPA main switch assembly is on.

      • Shift lever is in R.

  3. SYSTEM CONTROL


    1. No. 1 Clearance Warning Buzzer


      1. The on and off times of the No. 1 clearance warning buzzer vary as shown in the table below, depending on the distance between the obstacle and the ultrasonic sensor:

        Ultrasonic Sensor Obstacle Distance [mm (in.)] Off Time (ms) On Time (ms)
        Detection Level Longest 1500 +/- 150 to 600 +/- 60 (59.1 +/- 5.91 to 23.6 +/- 2.36) 500 +/- 50 200 +/- 20
        Long 600 +/- 60 to 450 +/- 50 (23.6 +/- 2.36 to 17.7 +/- 1.97) 200 +/- 20 200 +/- 20
        Middle 450 +/- 50 to 350 +/- 40 (17.7 +/- 1.97 to 13.8 +/- 1.57 ) 100 +/- 10 100 +/- 10
        Short 350 +/- 40 or less (13.8 +/- 1.57 or less) 0 Continuous
        B002N7WE01

      2. When a malfunction is detected, the No. 1 clearance warning buzzer continues to sound as shown in the illustration.

        B002NK9E01

    2. Detection Area


      1. The detection areas of the No. 1 ultrasonic sensors are as shown in the following illustration.

      2. These detection areas are applicable when positioning a 60 mm (2.36 in.) diameter pole parallel or perpendicular to the ground. The ranges vary depending on the measuring method and type of obstacle.

        B002N8BC01
        *a Wall *b Approximately 1720 mm (67.7 in.)
        *c Approximately 1000 mm (39.4 in.) *d Approximately 1500 mm (59.1 in.)
        *e Approximately 550 mm (21.6 in.) *f Approximately 100 mm (3.9 in.)
        *g The illustrations shown are examples only. - -