TOYOTA PARKING ASSIST-SENSOR SYSTEM(for Hatchback)


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    No. 1 Ultrasonic Sensor (2) Detects the distance between the vehicle and an obstacle.
    No. 2 Ultrasonic Sensor (4)
    No. 3 Ultrasonic Sensor (4)
    No. 1 Clearance Warning Buzzer (Front) Sounds to inform the driver according to the distance to the obstacle.
    No. 2 Clearance Warning Buzzer (Rear)
    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/No. 2/No. 3 ultrasonic sensor to inform the driver.
    Master Warning Light Illuminates in accordance with the indication on the multi-information display.
    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.
    Clearance Warning ECU Assembly

    • Judges the approximate distance between the vehicle and an obstacle based on signals from the No. 1/No. 2/No. 3 ultrasonic sensors. Output signals are sent to the multi-information display.

    • Sounds the No. 1 or No. 2 clearance warning buzzer.
    Air Conditioning Amplifier Assembly Sends outside temperature information to the clearance warning ECU assembly to adjust the distance rate from the No. 1/No. 2/No. 3 ultrasonic sensors.
    Main Body ECU (Multiplex Network Body ECU) Sends the parking brake signal to the clearance warning ECU assembly.*1
    ECM Transmits the shift position signals to the clearance warning ECU assembly.*2

    Brake Actuator Assembly

    - Skid Control ECU

    		 Sends the wheel speed signal to the clearance warning ECU assembly.
    Back-up Light Switch Assembly*1 Sends the shift position signals to the clearance warning ECU assembly.
    Park/Neutral Position Switch Assembly*2 Sends the shift position signals to the ECM.

    *1: Models with manual transaxle or multi-mode manual transaxle

    *2: Models with multidrive/continuously variable transaxle

  2. FUNCTION


    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.*1

      • Parking brake switch assembly is off.*2

      • Shift lever is in a position other than P.*3

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

      • Ignition switch is ON.

      • System is activated.*1

      • Back-up light switch is on.*2

      • Shift lever is in R.*3
      Rear Center

      *1: Even if the back sonar or clearance sonar switch assembly is off, the system is activated when the simple-intelligent parking assist system is operating.

      *2: Models with manual transaxle or multi-mode manual transaxle

      *3: Models with multidrive/continuously variable transaxle

    2. No. 1/No. 2 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 375 +/- 37.5 (19.7 +/- 2.0 to 14.8 +/- 1.5) 150 +/- 15 150 +/- 15
        Middle 375 +/- 37.5 to 250 +/- 25 (14.8 +/- 1.5 to 9.8 +/- 1.0) 75 +/- 7.5 75 +/- 7.5
        Short 250 +/- 25 or less (9.8 +/- 1.0 or less) Continuous Sound 0
        Front Center Longest 1000 +/- 100 to 550 +/- 55 (39.4 +/- 3.9 to 21.7 +/- 2.2) 150 +/- 15 650 +/- 15
        Long 550 +/- 55 to 425 +/- 42.5 (21.7 +/- 2.2 to 16.7 +/- 1.7) 150 +/- 15 150 +/- 15
        Middle 425 +/- 42.5 to 300 +/- 30 (16.7 +/- 1.7 to 11.8 +/- 1.2)*1 75 +/- 7.5 75 +/- 7.5
        425 +/- 42.5 to 250 +/- 25 (16.7 +/- 1.7 to 9.8 +/- 1.0)*2
        Short 300 +/- 30 or less (11.8 +/- 1.2 or less)*1 Continuous Sound 0
        250 +/- 25 or less (9.8 +/- 1.0 or less)*2
        Front Side Short 250 +/- 25 or less (9.8 +/- 1.0 or less) Continuous Sound 0

        *1: While the simple-intelligent parking assist system is not operating

        *2: While the simple-intelligent parking assist system is operating

      2. Depending on the detection distance and the detection area, the sound pattern of the No. 2 clearance warning buzzer will vary.

        Detection Area Detection Distance (mm (in.)) Buzzer Sound Pattern
        On (msec.) Off (msec.)
        Rear Corner Long 500 +/- 50 to 375 +/- 37.5 (19.7 +/- 2.0 to 14.8 +/- 1.5) 150 +/- 15 150 +/- 15
        Middle 375 +/- 37.5 to 250 +/- 25 (14.8 +/- 1.5 to 9.8 +/- 1.0) 75 +/- 7.5 75 +/- 7.5
        Short 250 +/- 25 or less (9.8 +/- 1.0 or less) Continuous Sound 0
        Rear Center Longest 1500 +/- 150 to 550 +/- 55 (59.1 +/- 5.9 to 21.7 +/- 2.2) 150 +/- 1.5 650 +/- 65
        Long 550 +/- 55 to 425 +/- 42.5 (21.7 +/- 2.2 to 16.7 +/- 1.7) 150 +/- 1.5 150 +/- 1.5
        Middle 425 +/- 42.5 to 300 +/- 30 (16.7 +/- 1.7 to 11.8 +/- 1.2)*1 75 +/- 7.5 75 +/- 7.5
        425 +/- 42.5 to 250 +/- 25 (16.7 +/- 1.7 to 9.8 +/- 1.0)*2
        Short 300 +/- 30 or less (11.8 +/- 1.2 or less)*1 Continuous Sound 0
        250 +/- 25 or less (9.8 +/- 1.0 or less)*2

        *1: While the simple-intelligent parking assist system is not operating

        *2: While the simple-intelligent parking assist system is operating

      3. The No. 1/No. 2/No. 3 ultrasonic sensors are divided into 2 groups: a front section group (front corners, front center and front sides) and a rear section group (rear corners and rear center). If multiple No. 1/No. 2/No. 3 ultrasonic sensors detect obstructions at the same time, the No. 1/No. 2 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 Front Section
        Short Middle Long Longest Not detected
        Rear Section Short Timing 1 Continuous Sound (Rear) Continuous Sound (Rear) Continuous Sound (Rear) Continuous Sound (Rear)
        Middle Continuous Sound (Front) 75/75 (*) 75/75 (Rear) 75/75 (Rear) 75/75 (Rear)
        Long Continuous Sound (Front) 75/75 (Front) 150/150 (*) 150/150 (Rear) 150/150 (Rear)
        Longest Continuous Sound (Front) 75/75 (Front) 150/150 (Front) 150/650 (*) 150/650 (Rear)
        Not detected Continuous Sound (Front) 75/75 (Front) 150/150 (Front) 150/650 (Front) None

        *: The buzzer of the front or rear sensor, which is closest to the obstacle, sounds.

        Figure 1. Timing 1

        A01G2GKE01

    3. 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.

        A01G2H0C01
        *1 Front Corner LH/Front Side LH *2 Front Corner RH/Front Side RH
        *3 Front Center *4 Rear Corner LH
        *5 Rear Corner RH *6 Rear Center
        *7 Distance *8 Longest
        *9 Long *10 Middle
        *11 Short *12 Flashes

      3. A screen displaying a warning message indicating a No. 1/No. 2/No. 3 ultrasonic sensor malfunction, No. 1/No. 2/No. 3 ultrasonic sensor freezing, or presence of foreign matter on the No. 1/No. 2/No. 3 ultrasonic sensor, is displayed on the multi-information display. The warning message appears in the same language that has been selected by the language selector of the multi-information display.

        A01G2H4

    4. Detection Area


      1. The detection areas of the No. 1/No. 2/No. 3 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 2. Corners

        A01G2ICC02
        *a Approximately 500 mm (19.7 in.) *b Approximately 650 mm (25.6 in.)
        *c Approximately 550 mm (21.7 in.) *d Approximately 100 mm (3.9 in.)

        Figure 3. Center

        A01G2HQC02
        *a Approximately 1000 mm (39.4 in.) *b Approximately 1500 mm (59.1 in.)
        *c Approximately 650 mm (25.6 in.) *d Approximately 100 mm (3.9 in.)

        Figure 4. Sides

        A01G2ILC02
        *a Approximately 250 mm (9.8 in.) *b Approximately 400 mm (15.7 in.)
        *c Approximately 100 mm (3.9 in.) - -

  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.