LEXUS PARKING ASSIST-SENSOR SYSTEM OPERATION CHECK


  1. Self-diagnosis System


    1. If the clearance warning ECU assembly detects that an ultrasonic sensor is malfunctioning, a malfunction indication is displayed on the combination meter assembly and accessory meter assembly*1 or multi-display*2.

      Malfunctioning Item Detection Condition

      Warning Message

      (Multi-information Display)

      Malfunction Indication

      (Combination Meter Assembly)

      Malfunction Indication

      (Multi-display)

      Buzzer Sounding

      (Combination Meter Assembly)

      		 Suspected Area
      Frozen indication

      • The No. 1 ultrasonic sensor is covered with foreign matter, such as mud or snow

      • The No. 1 ultrasonic sensor is frozen

      		 Clean Park Sonar ○ ○ ○

      • Check if any foreign matter is attached to the ultrasonic sensors and their surrounding areas

        Click here

      • If there is no foreign matter attached to the ultrasonic sensors and their surrounding areas, check for DTCs

        Click here

      Open circuit indication

      • There is an open circuit between the clearance warning ECU assembly and the No. 1 ultrasonic sensor

      • The No. 1 ultrasonic sensor is malfunctioning

      		 Check Park Sonar System ○ ○ ○

      Check for DTCs

      Click here

      Communication malfunction indication Malfunction in the CAN communication system between the radio receiver assembly and clearance warning ECU assembly - - ○ -

      Proceed to "Detection operation is normal but communication malfunction indication is displayed on the multi-display assembly" in Problem Symptoms Table

      Click here


      • *1: for 12.3 Inch Display

      • *2: for 8 Inch Display


      1. Malfunction Indication (Combination Meter Assembly)

        A01QC20C01
        *a Open circuit indication *b Frozen indication

      2. Malfunction Indication (Multi-display)

        A01QAEVC01
        *A for 12.3 Inch Display - -
        *a Frozen indication *b Open circuit indication
        A01QA92C01
        *A for 8 Inch Display - -
        *a Frozen indication *b Open circuit indication
        *c Cooperated Display *d Full Screen Display

      3. Buzzer Sounding (No. 1 Clearance Warning Buzzer)

        A01Q8U1E05

        Tech Tips

        Buzzer sounding is stopped after approximately 7.5 seconds elapsed.

  2. DETECTION RANGE MEASUREMENT AND DISPLAY INSPECTION

    Note

    Perform the following measurement and inspection with the shift lever in a position other than P. Be sure to apply the parking lever and depress the brake pedal firmly to prevent the vehicle from moving.


    1. Turn the engine switch on (IG).

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

    3. Detection range measurement:


      1. Move the shift lever according to the table below.

        Measurement Area Shift Lever Position
        Front Corner In any position other than P
        Rear Corner R
        Rear Center

      2. Move a 60 mm (2.4 in.) diameter pole near each sensor to measure its detection range. When measuring the longest-range detection of the rear center sonar, use a wall or equivalent.

        Note

        These detection ranges are applicable when positioning the 60 mm (2.4 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.

        Figure 1. Corner Sonar Detection Range

        A01QBDBC01
        *a Approximately 850 mm (33.5 in.) *b Approximately 600 mm (23.6 in.)
        *c Approximately 450 mm (17.7 in.) *d Approximately 200 mm (7.87 in.)

        Note

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

        Figure 2. Rear Center Sonar Detection Range

        A01Q97XC01
        *a Approximately 1800 mm (70.9 in.) *b Approximately 1500 mm (59.1 in.)
        *c Approximately 200 mm (7.87 in.) *d Approximately 1350 mm (53.1 in.)
        *e Approximately 600 mm (23.6 in.) *f Approximately 170 mm (6.69 in.)
        *g Wall - -

    4. Front corner sonar display and buzzer operation check


      1. When the No. 1 ultrasonic sensors (front corner sonar) have detected an obstacle, check the displays and check that the buzzer sounds.

        Operation Condition
        Engine Switch Back Sonar or Clearance Sonar Switch Assembly Shift Lever Position Vehicle Speed
        On (IG) On In any position other than P or R

        • Less than approximately 15 km/h (9 mph) if speed is increasing

        • Less than approximately 10 km/h (6 mph) if speed is decreasing
        On (IG) On R -
        A01QCKNC01
        *A for 12.3 Inch Display *B for 8 Inch Display
        *a Multi-information Display *b Multi-display
        *c Example (Front Corner Sonar) *d Close-range Detection
        *e Medium-range Detection *f Long-range Detection
        *g Side Screen Display *h Full Screen Display
        *i Cooperated Display - -
        A01Q9HTE23

        • *1: for 12.3 Inch Display

        • *2: for 8 Inch Display

        Tech Tips

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

      2. Rear corner sonar display and buzzer operation check


        1. When the No. 1 ultrasonic sensors (rear corner sonar) have detected an obstacle, check the display and check that the buzzer sounds.

        3. Operation Condition
        Engine Switch Back Sonar or Clearance Sonar Switch Assembly Shift Lever Position Vehicle Speed
        On (IG) On R -
        A01Q9U2C01
        *A for 12.3 Inch Display *B for 8 Inch Display
        *a Multi-information Display *b Multi-display
        *c Example (Rear Corner Sonar) *d Close-range Detection
        *e Medium-range Detection *f Long-range Detection
        *g Side Screen Display *h Full Screen Display
        *i Cooperated Display - -
        A01Q9HTE24

        • *1: for 12.3 Inch Display

        • *2: for 8 Inch Display

        Tech Tips

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

      3. Rear center sonar display and buzzer operation check


        1. When the No. 1 ultrasonic sensors (rear center sonar) have detected an obstacle, check the display and check that the buzzer sounds.

        4. Operation Condition
        Engine Switch Back Sonar or Clearance Sonar Switch Assembly Shift Lever Position Vehicle Speed
        On (IG) On R -
      A01Q9YTC01
      *A for 12.3 Inch Display *B for 8 Inch Display
      *a Multi-information Display *b Multi-display
      *c Example (Rear Center Sonar) *d Close-range Detection
      *e Medium-range Detection *f Long-range Detection
      *g Longest-range Detection *h Side Screen Display
      *i Full Screen Display *j Cooperated Display
      A01Q8XEE18

      • *1: for 12.3 Inch Display

      • *2: for 8 Inch Display

      Tech Tips

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