TOYOTA PARKING ASSIST-SENSOR SYSTEM DETAILS


  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 No. 1 ultrasonic sensors. Output signals are sent to the multi-information display.

    • Sounds the No. 1 clearance warning buzzer.
    No. 1 Ultrasonic Sensor (6) Detects the distance between an vehicle and the obstacle.
    No. 1 Clearance Warning Buzzer Sounds to inform the driver according to the distance to the obstacle.

    Combination Meter Assembly

    - 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 a No. 1 ultrasonic sensor to inform the driver.
    Back Sonar or Clearance Sonar Switch Assembly 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 a No. 1 ultrasonic sensor to inform the driver.
    Air Conditioning Amplifier Assembly Sends outside temperature information to the clearance warning ECU assembly to adjust the distance rate from the No. 1 ultrasonic sensors.
    Main Body ECU (Multiplex Network Body ECU) Sends model destination (information to indicate the market the vehicle was built for) to the clearance warning ECU assembly.
    Park/Neutral Position Switch Assembly Sends the shift position signals to the ECM.
    ECM Transmits the shift position signals to the clearance warning ECU assembly.

    • *: Models with parking assist monitor system

  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

      • Ignition switch is ON.

      • System is activated.

      • Shift lever is in a position other than P or R.

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

      • Ignition switch is ON.

      • System is activated.

      • Shift lever is in R.
      Rear Corner

      • Ignition switch is ON.

      • System is activated.

      • Shift lever is in R.
      Rear Center

      • Ignition switch is ON.

      • System is activated.

      • Shift lever is in R.

  3. CONSTRUCTION


    1. No. 1 Ultrasonic Sensor


      1. The No. 1 ultrasonic sensors consist of a microphone and a circuit portion that transmits and receives ultrasonic waves.

      2. The circuit portion is filled with urethane to prevent water from entering.

        B00025SE01
        Text in Illustration
        *1 Circuit Portion *2 Microphone
        *a A-A Cross Section - -

  4. OPERATION


    1. No. 1 Clearance Warning Buzzer


      1. Depending on the detection distance and the detection area, the sound pattern of the No. 1 clearance warning buzzer will vary.

        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) 150 +/- 15 150 +/- 15
        Middle 400 +/- 40 to 300 +/- 30 (15.7 +/- 1.6 to 11.8 +/- 1.2) 75 +/- 7.5 75 +/- 7.5
        Short 300 +/- 30 or less (11.8 +/- 1.2 or less) Continuous Sound 0
        Rear Corner Long 600 +/- 60 to 450 +/- 50 (23.6 +/- 2.4 to 17.7 +/- 2.0) 150 +/- 15 150 +/- 15
        Middle 450 +/- 50 to 300 +/- 30 (17.7 +/- 2.0 to 11.8 +/- 1.2) 75 +/- 7.5 75 +/- 7.5
        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) 150 +/- 1.5 650 +/- 65
        Long 600 +/- 60 to 450 +/- 50 (23.6 +/- 2.4 to 17.7 +/- 2.0) 150 +/- 1.5 150 +/- 1.5
        Middle 450 +/- 50 to 350 +/- 40 (17.7 +/- 2.0 to 13.8 +/- 1.6) 75 +/- 7.5 75 +/- 7.5
        Short 350 +/- 40 or less (13.8 +/- 1.6 or less) Continuous Sound 0

      2. The No. 1 ultrasonic sensors are divided into 2 groups: a front section group (front corners) and a rear section group (rear corners and rear center). If multiple No. 1 ultrasonic sensors detect obstructions at the same time, the No. 1 clearance warning buzzer sounds as follows, in accordance with the detection distance and detection area of each group:

        Buzzer Sound Pattern ON/OFF Time (msec.)
        Detection Distance Short (*A) Middle (*A) Long (*A) Not detected
        Short (*B) Timing 1 Timing 2 Timing 2 Continuous Sound
        Middle (*B) Timing 2 75/75 75/75 75/75
        Long (*B) Timing 2 75/75 150/150 150/150
        Longest (*B) Timing 2 75/75 150/150 150/650
        Not detected Continuous Sound 75/75 150/150 None

        • *A: Front section

        • *B: Rear section

        B0001YME04

    2. Multi-information Display


      1. The location of an obstacle and the approximate distance between the vehicle and the obstacle are displayed on the multi-information display.

      2. The number of lines shown on the display changes based on the actual distance and flashes when the distance is short.

        B0001YLE01
        Text in Illustration
        *1 Front Corner LH *2 Front Corner RH
        *3 Rear Corner LH *4 Rear Corner RH
        *5 Rear Center *6 Distance
        *7 Longest *8 Long
        *9 Middle *10 Short
        *11 Flashes - -

      3. Screens displaying warning messages relating to a No. 1 ultrasonic sensor malfunction, No. 1 ultrasonic sensor freezing, or presence of foreign matter on the No. 1 ultrasonic sensor, are displayed on the multi-information display.

        B000236E01
        Text in Illustration
        *1 Malfunctioning *2 Frozen/Dirty

    3. Multi-display (Models with Parking Assist Monitor System)


      1. If an obstacle is detected when the parking assist monitor system is activated, the approximate distance between the vehicle and the obstacle is displayed on the multi-display.

      2. The distance is displayed by color based on the actual distance to the obstacle. When an obstacle is detected at the long or middle distance, the indicator is yellow. The color changes from yellow to red when the distance becomes short.

        B0001S7E01
        Text in Illustration
        *1 Front Corner LH *2 Front Corner RH
        *3 Rear Corner LH *4 Rear Corner RH
        *5 Rear Center - -
        *a The illustrations shown are examples only. The illustrations may differ from the actual vehicle screens. - -

      3. The following items displayed by the multi-display are warning relating to sensor malfunction, sensor freezing, or presence of dirt on the sensor.

        B0001UYE01
        Text in Illustration
        *1 Malfunctioning *2 Frozen/Dirty

    4. Detection Area


      1. The detection areas of the No. 1 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.

        B0001RME01
        Text in Illustration (Corner Area:)
        *a Approximately 700 mm (27.6 in.) *b Approximately 750 mm (29.5 in.)
        *c Approximately 500 mm (19.7 in.) *d Approximately 600 mm (23.6 in.)
        *e Approximately 400 mm (15.7 in.) *f Approximately 200 mm (7.9 in.)
        B000225E01
        Text in Illustration (Rear Center Area:)
        *a Approximately 1800 mm (70.9 in.) *b Approximately 200 mm (7.9 in.)
        *c Approximately 1000 mm (39.4 in.) *d Approximately 500 mm (19.7 in.)

  5. 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.