LEXUS PARKING ASSIST-SENSOR SYSTEM OPERATION CHECK

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  1. INITIAL CHECK FUNCTION


    1. Turn the engine switch on (IG).

    2. After 2 seconds 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 displayed 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 No. 1 ultrasonic sensor and the ECU or a sensor is malfunctioning, the malfunction is displayed as shown in the illustration.

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          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.

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          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 No. 1 ultrasonic sensor and the ECU or a sensor is malfunctioning, the malfunction is displayed as shown in the illustration.

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          Tech Tips


          • This example shows an open circuit in the No. 1 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.

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

      3. Move the shift lever to R to check the No. 1 ultrasonic sensors, No. 2 ultrasonic sensors and No. 3 ultrasonic sensors.

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

      5. Move a a 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 a 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 sensor (FL, FR sensor) detection range

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          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

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          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

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          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 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 (RL, RR Sensor) No. 1 Ultrasonic Sensor (RLC, RRC 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.

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    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
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    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)
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    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
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    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)
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    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.