LEXUS PARKING ASSIST-SENSOR SYSTEM OPERATION CHECK


  1. SELF-CHECK FUNCTION INSPECTION (INITIAL CHECK)

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    Text in Illustration
    *1 Power switch
    *2 Lexus parking assist-sensor system
    *3 Buzzer sound

    1. Turn the power switch on (IG).

    2. Turn the Lexus parking assist-sensor system off, or check that the Lexus parking assist-sensor system is off.

    3. Turn the power switch off.

    4. Turn the power switch on (IG).

    5. Turn the Lexus parking assist-sensor system on, and check that the following occurs:

      1) After approximately 0.1 seconds, the buzzer sounds for approximately 1 second.

      2) The system starts detection operation mode.

      Tech Tips


      • During the initial check, the malfunction detection operates and obstacle detection does not operate.

      • In the detection operation mode, the obstacle detection and the malfunction detection operate.

      • If a sensor has an open circuit or a sensor malfunctions because it is wet or frozen, a malfunction display is shown in the multi-information display, and the buzzer sounds.

      • If the power switch is turned on (IG) while the Lexus parking assist-sensor system is on, the buzzer does not sound even though the malfunction detection operates.

  2. MALFUNCTION DISPLAY (MULTI-INFORMATION DISPLAY)


    1. Open circuit indication


      1. If there is an open circuit between the ultrasonic sensor and the clearance warning ECU*1 or parking assist ECU*2 or a sensor is malfunctioning, the malfunction is displayed as shown in the illustration.


        • *1: w/o Parking Assist Monitor System

        • *2: w/ Parking Assist Monitor System

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        Tech Tips


        • The example shows an open circuit in the ultrasonic sensor (front left sensor).

        • If a sensor has an open circuit, check for DTCs and troubleshoot according to each inspection procedure Click here.

    2. Frozen indication


      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 ultrasonic sensor (front left sensor) is covered with foreign matter.

        • If "CLEAN SONAR" is displayed, refer to "Frozen indication is displayed in self-check function" on the Problem Symptoms Table to inspect it Click here.

  3. DETECTION RANGE MEASUREMENT AND DISPLAY INSPECTION


    1. Detection range measurement:

      Note

      Make sure that the vehicle does not move by applying the parking brake firmly.


      1. Turn the power switch on (IG).

      2. Move the shift lever to R to check the ultrasonic sensors.

    2. Turn the Lexus parking assist-sensor system on.

    3. Move a 60 mm (2.36 in.) diameter pole near each sensor to measure its detection range.

      Note

      These detection ranges are applicable when positioning the 60 mm (2.36 in.) diameter pole parallel or perpendicular to the ground. The detection range varies depending on the measuring method and type of obstacle (such as walls).


      1. Clearance Sonar

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        Note

        The No. 1 ultrasonic sensor side view detection range hatched area (labeled *1) represents the cross section of the top view of the lines of detection range A. The hatched area *1 does not represent the entire side view detection range.

      2. Back Sonar

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    4. When the ultrasonic sensors (front corner sonar) have detected an obstacle, check the displays and buzzer sounds.

      Operation Condition
      Power Switch Lexus Parking Assist-sensor System Shift Lever Position Vehicle Speed
      On (IG) ON In any position except P

      • Less than 15 km/h (9.3 mph) if speed is increasing

      • Less than 10 km/h (6.2 mph) if speed is decreasing
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      *5: When shift lever in D

      Tech Tips

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

    5. When the ultrasonic sensors (rear corner sonar) have detected an obstacle, check the display and buzzer sounds.

      6. Operation Condition
      Power Switch Lexus Parking Assist-sensor System Shift Lever Position Vehicle Speed
      On (IG) ON R -
      A01NGQDE01

      Tech Tips

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

    6. When the ultrasonic sensors (back sonar) have detected an obstacle, check the display and buzzer sounds.

      7. Operation Condition
      Power Switch Lexus Parking Assist-sensor System Shift Lever Position Vehicle Speed
      On (IG) ON R -
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    Tech Tips

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