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 an 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. Output signals are sent to the radio and display receiver assembly and combination meter assembly.

      • Sounds the No. 1 clearance warning buzzer.
      Combination Meter Assembly

      • Transmits received vehicle speed signals to the clearance warning ECU assembly.

      • Transmits the outside air temperature to the clearance warning ECU assembly.

      Multi-information display


      • Clearance Sonar Main Switch

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

      • Displays an indication of a malfunction or freezing of an ultrasonic sensor to inform the driver.

      • Operating this switch allows the operation of the Toyota parking assist-sensor system to be enabled or disabled.
      Radio and Display Receiver Assembly

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

      • Displays an indication of a malfunction or freezing of an ultrasonic sensor to inform the driver.

      • The sound volume, distance required to sound the buzzer and distance required to trigger the display can be chosen on the setup screen for the Toyota parking assist-sensor system.
      Shift Lever Position Sensor Transmits the shift position signal to the hybrid vehicle control ECU.
      Hybrid Vehicle Control ECU Transmits the shift position signal to the clearance warning ECU assembly.
      Central Gateway ECU Transmits the signal between the CAN communication bus.

  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
      Front Corner

      • Power switch is on (IG).

      • System is activated.

      • Shift lever is not in P.

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

      • Power switch is on (IG).

      • System is activated.

      • Shift lever is not in P and R.

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

      • Power switch is on (IG).

      • System is activated.

      • Shift lever is in R.
      Rear Center

      • Power switch is on (IG).

      • System is activated.

      • 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:

        Detection Area Detection Distance (mm (in.)) Buzzer Sound Pattern
        On (msec.) Off (msec.)
        Front Corner Long

        500+/-50 to 400+/-40

        (19.7+/-2.0 to 15.7+/-1.6)

        		 200+/-20 200+/-20
        Middle

        400+/-40 to 300+/-30

        (15.7+/-1.6 to 11.8+/-1.2)

        		 100+/-10 100+/-10
        Short

        300+/-30 or less

        (11.8+/-1.2 or less)

        		 Continuous Sound 0
        Front Center Longest

        1000+/-100 to 500+/-50

        (39.4+/-3.9 to 19.7+/-2.0)

        		 500+/-50 200+/-20
        Long

        500+/-50 to 400+/-40

        (19.7+/-2.0 to 15.7+/-1.6)

        		 200+/-20 200+/-20
        Middle

        400+/-40 to 300+/-30

        (15.7+/-1.6 to 11.8+/-1.2)

        		 100+/-10 100+/-10
        Short

        300+/-30 or less

        (11.8+/-1.2 or less)

        		 Continuous Sound 0
        Rear Corner Long

        550+/-60 to 400+/-40

        (21.6+/-2.4 to 15.7+/-1.6)

        		 200+/-20 200+/-20
        Middle

        400+/-40 to 300+/-30

        (15.7+/-1.6 to 11.8+/-1.2)

        		 100+/-10 100+/-10
        Short

        300+/-30 or less

        (11.8+/-1.2 or less)

        		 Continuous Sound 0
        Rear Center Longest

        1500+/-150 to 600+/-60

        (59.1+/-5.9 to 23.6+/-2.4)

        		 500+/-50 200+/-20
        Long

        600+/-60 to 450+/-50

        (23.6+/-2.4 to 17.7+/-2.0)

        		 200+/-20 200+/-20
        Middle

        450+/-50 to 350+/-40

        (17.7+/-2.0 to 13.8+/-1.6)

        		 100+/-10 100+/-10
        Short

        350+/-40 or less

        (13.8+/-1.6 or less)

        		 Continuous Sound 0

    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.

        Figure 1. Corner Area

        A01RY13C01
        *a Approximately 660 mm (26.0 in.) *b Approximately 615 mm (24.2 in.)
        *c Approximately 500 mm (19.7 in.) *d Approximately 550 mm (21.7 in.)
        *e Approximately 375 mm (14.8 in.) *f Approximately 335 mm (13.2 in.)
        *g Approximately 100 mm (3.9 in.) *h Approximately 100 mm (3.9 in.)
        *i Detection Area - -

        Note

        The ultrasonic sensor side view detection range area (labeled (1)) represents the cross section of the top view of detection range A. The area (1) does not represent the entire side view detection range.

        Figure 2. Center Area

        A01RXMQC01
        *a Approximately 1730 mm (68.1 in.) *b Approximately 1000 mm (39.4 in.)
        *c Approximately 1000 mm (39.4 in.) *d Approximately 1500 mm (59.1 in.)
        *e Approximately 1540 mm (60.6 in.) *f Approximately 435 mm (17.1 in.)
        *g Approximately 100 mm (3.9 in.) *h Approximately 100 mm (3.9 in.)
        *i Approximately 400 mm (15.7 in.) *j Detection Area