LEXUS PARKING ASSIST-SENSOR SYSTEM OPERATION CHECK


  1. SELF-CHECK FUNCTION INSPECTION

    A0160BGE05

    1. Turn the engine switch on (IG).

    2. When the LEXUS parking assist-sensor system is turned on, check that the following occurs: 1) after approximately 0.1 seconds, the buzzer sounds for 0.8 +/- 0.3 seconds, and 2) the system starts the obstacle detection operation.

      Tech Tips


      • 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 or multi-display, and the buzzer sounds.

      • When the sensor condition returns to normal, the system returns to normal clearance sonar mode.

      • If the satellite switch (clearance sonar main switch) is on and the engine switch is turned on (IG), the buzzer does not sound.

  2. MALFUNCTION DISPLAY (MULTI-INFORMATION DISPLAY)


    1. Ultrasonic sensor open circuit


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

        A0162CQE01

        Tech Tips


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

        • If a sensor has an open circuit, refer to "Open circuit is displayed during self-check function" on 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.

        A0160GOE03

        Tech Tips


        • The example shows that the ultrasonic sensor (front left sensor) is covered with foreign matter.

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

  3. MALFUNCTION DISPLAY (MULTI-DISPLAY)


    1. Ultrasonic sensor open circuit


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

        A015ZRDE03

        Tech Tips


        • This example shows an open circuit in the ultrasonic sensor (rear right sensor).

        • If a sensor has an open circuit, refer to "Open circuit is displayed during self-check function" on 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.

        A01601YE03

        Tech Tips


        • The example shows that the ultrasonic sensor (front left 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. DETECTION RANGE MEASUREMENT AND DISPLAY INSPECTION


    1. Detection range measurement

      Note

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


      1. Turn the engine switch on (IG).

      2. Move the shift lever to R to check the ultrasonic sensors (rear sensors).

    2. Turn the satellite switch (clearance sonar main switch) on.

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

      Note

      These detection ranges are applicable when positioning the φ 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).


      1. Clearance Sonar:

        A015ZFUE03

        Note

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

      2. Back Sonar:

        A016374E01

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

      Operation Condition
      Engine Switch Clearance Sonar Main Switch Shift Lever Position Vehicle Speed
      On (IG) ON In any position except P 6 mph (10 km/h) or less
      A015ZKPE05
      A016197E09

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

      6. Operation Condition
      Engine Switch Clearance Sonar Main Switch Shift Lever Position Vehicle Speed
      On (IG) ON R 6 mph (10 km/h) or less
      A0160IDE04
      A015Z2SE13

      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 (rear clearance sonar) have detected an obstacle, check the display and buzzer sounds.

      7. Operation Condition
      Engine Switch Clearance Sonar Main Switch Shift Lever Position Vehicle Speed
      On (IG) ON R 6 mph (10 km/h) or less
    A0162QSE04
    A016369E05

    Tech Tips

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