LEXUS PARKING ASSIST-SENSOR SYSTEM OPERATION CHECK


  1. SELF-CHECK FUNCTION INSPECTION (INITIAL CHECK)

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    Text in Illustration
    *a Power Switch
    *b LEXUS Parking Assist-sensor System
    *c Buzzer Sound
    *d Approximately 2 seconds
    *e Approximately 1 second
    *f Detection Operation Mode

    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 system starts detection operation mode.

      Tech Tips


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

      • In detection operation mode, obstacle detection and 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 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 assembly 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 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. MALFUNCTION DISPLAY (ACCESSORY METER ASSEMBLY [for 12.3 Inch], MULTI-DISPLAY [for 8 Inch])


    1. Ultrasonic sensor open circuit


      1. If there is an open circuit between the ultrasonic sensor and the clearance warning ECU assembly 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 ultrasonic sensor (rear right sensor).

        • If a sensor has an open circuit, refer to "Open circuit is displayed during self-check function" on 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 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 that the vehicle does not move by applying the parking brake firmly.


      1. Hybrid control system starts.

      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).

      Tech Tips

      Have an assistant move the pole.


      1. Clearance Sonar

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        Text in Illustration
        *a Approximately 800 mm (31.5 in.) *b Approximately 500 mm (19.7 in.)
        *c Approximately 450 mm (17.7 in.) *d Approximately 320 mm (12.6 in.)
        *e Approximately 200 mm (7.87 in.) *f Approximately 1900 mm (74.8 in.)
        *g Approximately 1000 mm (39.4 in.) *h Approximately 600 mm (23.6 in.)
        *i Approximately 1700 mm (66.9 in.) *j Approximately 1200 mm (47.2 in.)
        *k Approximately 1500 mm (59.1 in.) *l Approximately 270 mm (10.6 in.)

        Note

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

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

      Operation Condition
      Power Switch LEXUS Parking Assist sensor System Shift State Vehicle Speed
      Hybrid control system starts On Other than Park (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: Full screen display

      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 displays and check that the buzzer sounds.

      6. Operation Condition
      Power Switch LEXUS Parking Assist-sensor System Shift State Vehicle Speed
      Hybrid control system starts On Reverse (R) -
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      • *5: Full screen display

      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 displays and check that the buzzer sounds.

      7. Operation Condition
      Power Switch LEXUS Parking Assist-sensor System Shift State Vehicle Speed
      Hybrid control system starts On Reverse (R) -
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    • *6: Full screen display

    Tech Tips

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

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    • *6: Full screen display

    Tech Tips

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