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 multi-display assembly.

      Malfunctioning Item Detection Condition

      Warning Message

      (Multi-information Display)

      Malfunction Indication

      (Combination Meter Assembly)

      Malfunction Indication

      (Multi-display Assembly)

      Buzzer Sounding

      (Multi-information Display)

      		 Suspected Area
      Frozen indication

      • The No. 1 ultrasonic sensor or No. 2 ultrasonic sensor is covered with foreign matter, such as mud or snow

      • The No. 1 ultrasonic sensor or No. 2 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 or No. 2 ultrasonic sensor

      • The No. 1 ultrasonic sensor or No. 2 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. Malfunction Indication (Combination Meter Assembly)

        B004EZ5C01
        *a Open circuit indication *b Frozen indication

      2. Malfunction Indication (Multi-display Assembly)

        B004FCNC01
        *a Frozen indication *b Open circuit indication
        *c Communication malfunction indication *d When the shift lever is in R
        *e When the shift lever is not in P or R - -

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

        B004EQ6E03

        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 power 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
        Front Center In any position other than P or R
        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 front center sonar and 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

        B004ET1E01

        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. Front Center Sonar Detection Range

        B004EMCE01

        Figure 3. Rear Center Sonar Detection Range

        B004FLZE01

    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
        Power 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 -
        B004GBEC01
        *A for Optitron Meter Type *B for TFT Meter Type
        *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 When the shift lever is not in P or R *h When the shift lever is in R
        B004G9YC01

        • *1: When the shift lever is not in P or R

        • *2: When the shift lever is in R

        Tech Tips

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

      2. Front center sonar display and buzzer operation check


        1. When the No. 2 ultrasonic sensors (front center sonar) have detected an obstacle, check the display and check that the buzzer sounds.

        3. Operation Condition
        Power 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
        B004FYTC01
        *A for Optitron Meter Type *B for TFT Meter Type
        *a Multi-information Display *b Multi-display
        *c Example (Front Center Sonar) *d Close-range Detection
        *e Medium-range Detection *f Long-range Detection
        *g Longest-range Detection - -
        B004EUUE13

        Tech Tips

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

      3. 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.

        4. Operation Condition
        Power Switch Back Sonar or Clearance Sonar Switch Assembly Shift Lever Position Vehicle Speed
        On (IG) On R -
      B004FUPC01
      *A for Optitron Meter Type *B for TFT Meter Type
      *a Multi-information Display *b Multi-display
      *c Example (Rear Corner Sonar) *d Close-range Detection
      *e Medium-range Detection *f Long-range Detection
      B004G9YE17

      Tech Tips

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

    5. 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.

      6. Operation Condition
      Power Switch Back Sonar or Clearance Sonar Switch Assembly Shift Lever Position Vehicle Speed
      On (IG) On R -
    B004G37C01
    *A for Optitron Meter Type *B for TFT Meter Type
    *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 - -
    B004EUUE13

    Tech Tips

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