TOYOTA PARKING ASSIST-SENSOR SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Clearance Warning ECU Assembly

    • Judges the approximate distance between the vehicle and an obstacle based on signals from the ultrasonic sensors. Output signals are sent to the multi-information display or multi-display assembly.

    • Sounds the No. 1 clearance warning buzzer.
    No. 1 Ultrasonic Sensor (2) Detects the distance between the vehicle and an obstacle.
    No. 2 Ultrasonic Sensor (4)
    No. 1 Clearance Warning Buzzer Sounds to inform the driver according to the distance to the obstacle.
    Combination Meter Assembly TOYOTA Parking Assist-sensor System Indicator Light Illuminates to inform the driver when the system operation conditions are met.
    Multi-information Display

    • 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.

    • Displays the multi-information display screen for turning the clearance sonar system ON/OFF, in response to operation signals of the multi-information display.
    Master Warning Light Illuminates in accordance with the indication on the multi-information display.
    Integration Control and Panel Assembly Transmits an on/off status signal of the TOYOTA parking assist-sensor system to the clearance warning ECU assembly.
    Steering Pad Switch Assembly Transmits the operation signal to the combination meter assembly.
    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.

    • Transmits the setup signal for the TOYOTA parking assist-sensor system to the clearance warning ECU assembly.
    Main Body ECU (Multiplex Network Body ECU) Sends model destination signal (information to indicate the market the vehicle was built for) to the clearance warning ECU assembly.
    Network Gateway ECU Transmits data between the CAN V bus and CAN sub bus 2.
    EV Control ECU Transmits the shift position signal to the clearance warning ECU assembly.

  2. SYSTEM CONTROL


    1. Detection Area


      1. The detection areas of the ultrasonic sensor 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

        A01MAERC01
        *a Approximately 900 mm (35.4 in.) *b Approximately 200 mm (7.87 in.)
        *c Approximately 400 mm (15.7 in.) *d Approximately 550 mm (21.7 in.)
        *e Approximately 250 mm (9.84 in.) *f Approximately 350 mm (13.8 in.)

        Note

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

        Figure 2. Center Area

        A01MA1RC01
        *a Approximately 1800 mm (70.9 in.) *b Approximately 200 mm (7.87 in.)
        *c Approximately 1300 mm (51.2 in.) *d Approximately 550 mm (21.7 in.)
        *e Approximately 350 mm (13.8 in.) - -

    2. 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 on (IG).

      • System is activated.

      • Park (P) or Reverse (R) is not selected.

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

      • Power switch on (IG).

      • System is activated.

      • Reverse (R) is selected.
      Rear Corner

      • Power switch on (IG).

      • System is activated.

      • Reverse (R) is selected.
      Rear Center

      • Power switch on (IG).

      • System is activated.

      • Reverse (R) is selected.

  3. DIAGNOSIS


    1. If a system malfunction is detected, the clearance warning ECU assembly stores Diagnostic Trouble Codes (DTCs) in its memory. For details, refer to the Repair Manual.