TOYOTA PARKING ASSIST-SENSOR SYSTEM OPERATION CHECK

A0156UIE14

  1. INITIAL CHECK FUNCTION


    1. Turn the engine switch on (IG).

    2. After 2 sec. or more have passed, turn the back sonar or clearance sonar switch assembly ON. Then check the buzzer sounding condition.

      Tech Tips


      • If a malfunction is detected in the ultrasonic sensor circuits, the location of the malfunctioning sensor blinks on the display's vehicle graphic. However, after the sensor returns to normal, the display also returns to normal.

      • When the engine switch is turned on (IG) while the back sonar or clearance sonar switch assembly is on, the buzzer will not sound.

    3. MALFUNCTION OF MULTI-INFORMATION DISPLAY


      1. Ultrasonic sensor open circuit


        1. If there is an open circuit between the ultrasonic sensor and the ECU or a sensor is malfunctioning, the malfunction is displayed as shown in the illustration.

          A0159V6E02

          Tech Tips


          • The example shows an open circuit in the No. 1 ultrasonic sensor (FL sensor).

          • If a sensor has an open circuit, "Check Sonar" is displayed. Refer to "open circuit in front sensor is displayed as a result or self-check" in the problem symptoms table to inspect it.

      2. Ultrasonic sensor frozen


        1. If a sensor is covered with foreign matter, such as mud or snow, the affected sensor is displayed as shown in the illustration.

          A015DZ3E02

          Tech Tips


          • The example shows that the No. 1 ultrasonic sensor (FL sensor) is covered with foreign matter.

          • If "Clean Sonar" is displayed, cleaning the foreign matter from the sensor will return the sensor to normal.

    4. MALFUNCTION OF MULTI-DISPLAY


      1. Ultrasonic sensor open circuit


        1. If there is an open circuit between the ultrasonic sensor and the ECU or a sensor is malfunctioning, the malfunction is displayed as shown in the illustration.

          A0155ATE01

          Tech Tips


          • This example shows an open circuit in the No. 2 ultrasonic sensor (RR sensor).

          • If a sensor has an open circuit, refer to "open circuit in rear sensor is displayed as a result of self-check" in the problem symptoms table to inspect it.

      2. Ultrasonic sensor frozen


        1. If a sensor is covered with foreign matter, such as mud or snow, the affected sensor is displayed as shown in the illustration.

          A015D6ME01

          Tech Tips


          • The example shows that the No. 1 ultrasonic sensor (FL sensor) is covered with foreign matter.

          • If "Clean sonar" is displayed, cleaning the foreign matter from the sensor will return the sensor to normal.

    5. DETECTION RANGE MEASUREMENT AND DISPLAY CHECK

      Note

      Apply the parking brake securely so that the vehicle does not move.


      1. Turn the engine switch on (IG).

      2. Move the shift lever to R to check the No. 1 ultrasonic sensors.

      3. Move the shift lever to D and N to check the No. 1 ultrasonic sensors.

      4. Turn the back sonar or clearance sonar switch assembly on.

      5. Move the diameter of 60 mm (2.36 in.) pole around the sensor to measure the detection range of the sensor.

        Note


        • These detection ranges are applicable when positioning the diameter of 60 mm (2.36 in.) pole parallel or perpendicular to the ground.

        • The ranges vary depending on the measuring method and type of obstacle (such as walls).

        • For close-range and medium-range detection, the values shown are for when using a pole with a diameter of 60 mm (2.36 in.). For long-range detection, the values shown are for when using walls.

        • The detection range of the resin bumper and steel bumper are not the same, as their installation positions are slightly different.


        1. No. 1 ultrasonic sensors (FL, FR sensor) detection range

          A015BU7E02

          Note

          The area (labeled*1) which represents a side view of the No. 1 ultrasonic sensor (FL, FR sensor) detection range is a cross section of the detection range at the position labeled A which is shown in the top view. The area (labeled*1) does not represent the entire detection range.

        2. No. 1 ultrasonic sensor (RL, RR sensor) detection range

          A015BLCE04

          Note

          The area (labeled*1) which represents a side view of the No. 1 ultrasonic sensor (RL, RR sensor) detection range is a cross section of the detection range at the position labeled A which is shown in the top view. The area (labeled*1) does not represent the entire detection range.

        3. No. 1 ultrasonic sensor (RLC, RRC sensor) detection range

          A015962E02

          Note

          The area (labeled*1) which represents a side view of the No. 1 ultrasonic sensor (RLC, RRC sensor) detection range is a cross section of the detection range at the position labeled A which is shown in the top view. The area (labeled*1) does not represent the entire detection range.

      6. When the ultrasonic sensors have detected an obstacle, check the multi-display, multi-information display and that the No. 1 clearance warning buzzer sounds with the back sonar or clearance sonar switch assembly on.

      6. Operation Condition
      Shift Lever Position Vehicle Speed Multi-display Detection, Multi-information Display Detection, Buzzer Detection
      No. 1 Ultrasonic Sensor (FL, FR Sensor) No. 1 Ultrasonic Sensor (RLC, RRC Sensor) No. 1 Ultrasonic Sensor (RL, RR Sensor)
      P - Only perform check operation
      D, S, (N) 9 km/h (5.6 mph) or less ○ X X
      R No limit ○ ○ ○

  1. Check that the buzzer sounds with the back sonar or clearance sonar switch assembly on as shown in the illustration.

    A0157VRE06
    No. 1 Ultrasonic Sensor (FL, FR Sensor) Detection Range
    Detection Distance
    1. Close-range detection Within 250 +/-30 mm (9.84 +/-1.18 in.)
    2. Medium-range detection 250 +/-30 to 375 +/-40 mm (9.84 +/-1.18 to 14.8 +/-1.57 in.)
    3. Long-range detection 375 +/-40 to 500 +/-50 mm (14.8 +/-1.57 to 19.7 +/-1.97 in.)
    No. 1 Ultrasonic Sensor Detection Range (RL, RR Sensor)
    Detection Distance
    1. Close-range detection Within 300 +/-30 mm (11.8 +/-1.18 in.)
    2. Medium-range detection 300 +/-30 to 450 +/-50 mm (11.8 +/-1.18 to 17.7 +/-1.97 in.)
    3. Long-range detection 450 +/-40 to 600 +/-60 mm (17.7 +/-1.97 to 23.6 +/-2.36 in.)
    No. 1 Ultrasonic Sensor (RLC, RRC Sensor) Detection Range
    Detection Distance
    1. Close-range detection Within 500 +/-50 mm (19.7 +/-1.97 in.)
    2. Medium-range detection 500 +/-50 to 650 +/-70 mm (19.7 +/-1.97 to 25.6 +/-2.76 in.)
    3. Long-range detection 650 +/-70 to 800 +/-80 mm (19.7 +/-1.97 to 31.5 +/-3.15 in.)
    4. Maximum long-range detection

    800 +/-80 to 1000 +/-100 mm (31.5 +/-3.15 to 39.4 +/-3.94 in.)

    800 +/-80 to 1500 +/-150 mm (31.5 +/-3.15 to 59.1 +/-5.91 in.)

    Tech Tips

    Ultrasonic waves are used to measure the detection range. However, the detection range may vary depending on the ambient temperature.

  2. Check the multi-information display and buzzer when the No. 1 ultrasonic sensors (FL, FR sensors) have detected an obstacle.

    Operation Condition
    Engine Switch back sonar or clearance sonar switch assembly Shift Lever Position Vehicle Speed
    On (IG) On D or N 9 km/h (5.6 mph) or less
    A015DYJE02
    Multi-information Display
    Detection Range Buzzer Number of Bars Displayed
    1. Close-range detection Sounds continuously 1 (red blinking)
    2. Medium-range detection

    Sounds intermittently

    (On: 75 msec., Off: 75 msec.)

    		 2 (yellow illuminated)
    3. Long-range detection

    Sounds intermittently

    (On: 150 msec., Off: 150 msec.)

    		 3 (yellow illuminated)
    A015A24E01
    Multi-display Assembly
    Detection Range Buzzer Number of Bars Displayed
    1. Close-range detection Sounds continuously 1 (red blinking)
    2. Medium-range detection

    Sounds intermittently

    (On: 75 msec., Off: 75 msec.)

    		 2 (yellow illumination)
    3. Long-range detection

    Sounds intermittently

    (On: 150 msec., Off: 150 msec.)

    		 3 (yellow illumination)

    Tech Tips

    Ultrasonic waves are used to measure the detection range. However, the detection range may vary depending on the ambient temperature.

  3. Check the multi-information display and buzzer when the No. 1 ultrasonic sensors (RL, RLC, RRC, RR sensors) have detected an obstacle.

    Operation Condition
    Engine Switch back sonar or clearance sonar switch assembly Shift Lever Position
    On (IG) On R
    A015BAJE02
    Multi-information Display
    Detection Range Buzzer Number of Bars Displayed
    1. Close-range detection Sounds continuously 1 (red blinking)
    2. Medium-range detection

    Sounds intermittently

    (On: 75 msec., Off: 75 msec.)

    		 2 (yellow illuminated)
    3. Long-range detection

    Sounds intermittently

    (On: 150 msec., Off: 150 msec.)

    		 3 (yellow illuminated)

    4. Maximum long-range detection

    (for rear center sensors)

    Sounds intermittently

    (On: 150 msec., Off: 650 msec.)

    		 4 (yellow illuminated)
    A0157KIE04
    Multi-display Assembly
    Detection Range Buzzer Number of Bars Displayed
    1. Close-range detection Sounds continuously 1 (red illumination)
    2. Medium-range detection

    Sounds intermittently

    (On: 75 msec., Off: 75 msec.)

    		 2 (yellow illumination)
    3. Long-range detection

    Sounds intermittently

    (On: 150 msec., Off: 150 msec.)

    		 3 (yellow illumination)

    4. Maximum long-range detection

    (for rear center sensors)

    Sounds intermittently

    (On: 150 msec., Off: 650 msec.)

    		 4 (yellow illumination)

    Tech Tips

    Ultrasonic waves are used to measure the detection range. However, the detection range may vary depending on the ambient temperature.