LEXUS PARKING ASSIST-SENSOR SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Clearance Warning ECU Assembly

    • Judges the approximate distance between the vehicle and an obstacle based on signals from the No. 1 ultrasonic sensors. Output signals are sent to the multi-information display or multi-display*.

    • Sounds the No. 1 clearance warning buzzer.
    No. 1 Ultrasonic Sensor (6) Detects the distance between the vehicle and an obstacle.
    No. 1 Clearance Warning Buzzer Sounds to inform the driver according to the distance to the obstacle.
    Combination Meter Assembly LEXUS Parking Assist-sensor System Indicator Light Illuminates to inform the driver when the system operation conditions are met.
    Multi-information Display

    • Displays the location of the obstacle and the approximate distance between the vehicle and the obstacle.

    • Displays an indication of a malfunction or freezing of a No. 1 ultrasonic sensor to inform the driver.
    Master Warning Light Illuminates in accordance with the indication on the multi-information display.
    Multi-display*

    • Displays the location of an obstacle and the approximate distance between the vehicle and the obstacle.

    • Displays an indication of a malfunction or freezing of a No. 1 ultrasonic sensor to inform the driver.

    • The sound volume, distance required to sound the buzzer and distance required to trigger the display can be chosen on the setup screen for the LEXUS parking assist-sensor system.
    Radio Receiver Assembly* Transmits the setup signal for the LEXUS parking assist-sensor system to the clearance warning ECU assembly.
    Back Sonar or Clearance Sonar Switch Assembly Operating this switch allows the operation of the LEXUS parking assist-sensor system to be enabled or disabled.
    Main Body ECU (Multiplex Network Body ECU) Sends model destination signal (information to indicate the market the vehicle was built for) to the clearance warning ECU assembly.
    Transmission Instrument Panel Shift Assembly Transmits the shift position signal to the power management control ECU.
    Power Management Control ECU Transmits the shift position signal to the clearance warning ECU assembly.

    • *: Models with Lexus display audio system or navigation system

  2. OPERATING CONDITION


    1. The operating condition of each sensor differs according to its installed position as shown in the table below:

      Installation Position Operating Condition
      Front Corner

      • Power switch is on (IG).

      • System is activated.

      • Park (P) or Reverse (R) is not selected.

      • Vehicle speed is approximately 10 km/h (6 mph) or less.

      • Power switch is on (IG).

      • System is activated.

      • Reverse (R) is selected.
      Rear Corner

      • Power switch is on (IG).

      • System is activated.

      • Reverse (R) is selected.
      Rear Center

      • Power switch is on (IG).

      • System is activated.

      • Reverse (R) is selected.

  3. CONSTRUCTION


    1. No. 1 Ultrasonic Sensor


      1. The No. 1 ultrasonic sensors consist of a microphone and a circuit portion that transmits and receives ultrasonic waves.

        B0022L3E02
        Text in Illustration
        *a Microphone *b A-A Cross Section

  4. OPERATION


    1. No. 1 Clearance Warning Buzzer


      1. Depending on the detection distance and the detection area, the sound pattern of the No. 1 clearance warning buzzer will vary.

        Detection Area Detection Distance Buzzer Sound Pattern
        Front Corner Long 500 +/- 50 mm to 400 +/- 50 mm (19.7 +/- 2.0 in. to 15.7 +/- 2.0 in.) 150/150
        Middle 400 +/- 50 mm to 300 +/- 50 mm (15.7 +/- 2.0 in. to 11.8 +/- 2.0 in.) 75/75
        Short 300 +/- 50 mm or less (11.8 +/- 2.0 in. or less) Continuous Sound
        Rear Corner Long 600 +/- 60 mm to 450 +/- 50 mm (23.6 +/- 2.4 in. to 17.7 +/- 2.0 in.) 150/150
        Middle 450 +/- 50 mm to 300 +/- 50 mm (17.7 +/- 2.0 in. to 11.8 +/- 2.0 in.) 75/75
        Short 300 +/- 50 mm or less (11.8 +/- 2.0 in. or less) Continuous Sound
        Rear Center Longest 1500 +/- 150 mm to 600 +/- 60 mm (59.0 +/- 5.9 in. to 23.6 +/- 2.4 in.) 150/650
        Long 600 +/- 60 mm to 450 +/- 50 mm (23.6 +/- 2.4 in. to 17.7 +/- 2.0 in.) 150/150
        Middle 450 +/- 50 mm to 350 +/- 50 mm (17.7 +/- 2.0 in. to 13.8 +/- 2.0 in.) 75/75
        Short 350 +/- 50 mm or less (13.8 +/- 2.0 in. or less) Continuous Sound

      2. The No. 1 ultrasonic sensors are divided into 2 groups: a front section group (front corners) and a rear section group (rear corners and rear center). If multiple No. 1 ultrasonic sensors detect obstructions at the same time, the No. 1 clearance warning buzzer sounds as follows, in accordance with the detection distance and detection area of each group:

        Buzzer Sound Pattern ON/OFF Time (msec.)
        Detection Distance Short (*A) Middle (*A) Long (*A) Not detected
        Short (*B) Timing 1 Timing 2 Timing 2 Continuous Sound
        Middle (*B) Timing 2 75/75 75/75 75/75
        Long (*B) Timing 2 75/75 150/150 150/150
        Longest (*B) Timing 2 75/75 150/150 150/650
        Not detected Continuous Sound 75/75 150/150 None

        • *A: Front section

        • *B: Rear section

        B0022RSE27

    2. Clearance Warning Buzzer Mute Function


      1. The buzzer can be temporarily muted using the buzzer mute switch in the multi-display of the radio receiver assembly* or navigation system.

        *: Models with Lexus display audio system or navigation system

      2. The mute function is canceled if the vehicle speed reaches a certain level.

        B0022L5E04
        Text in Illustration
        *a Buzzer Mute Switch *b The illustration shown is an example only. The illustration may differ from the actual vehicle screen.

    3. Multi-information Display


      1. The location of an obstacle and the approximate distance between the vehicle and the obstacle are displayed on the multi-information display.

      2. The number of lines shown on the display changes based on the actual distance and flashes when the distance is short.

        B0022F3E03
        Text in Illustration
        *A Models with Monochrome Type Multi-information Display *B Models with Color Type Multi-information Display
        *1 Front Corner LH *2 Front Corner RH
        *3 Rear Corner LH *4 Rear Corner RH
        *5 Rear Center *6 Distance
        *7 Longest *8 Long
        *9 Middle *10 Short
        *11 Flashes - -

      3. Screens displaying warning messages relating to a No. 1 ultrasonic sensor malfunction, No. 1 ultrasonic sensor freezing, or presence of foreign matter on the No. 1 ultrasonic sensor, are displayed on the multi-information display. The warning message appears in the same language that has been selected by the language selector of the multi-information display.

        B0022RTE01
        Text in Illustration
        *A Models with Monochrome Type Multi-information Display *B Models with Color Type Multi-information Display
        *1 Malfunctioning *2 Frozen/Dirty

    4. Multi-display (Models with Lexus Display Audio System or Navigation System)


      1. The location of an obstacle and the approximate distance between the vehicle and the obstacle are displayed on the multi-display. Also, warning messages relating to a No. 1 ultrasonic sensor malfunction, No. 1 ultrasonic sensor freezing, or presence of foreign matter on the No. 1 ultrasonic sensor, are displayed on the multi-display.

      2. The distance is displayed by the number of lines and color based on the actual distance. The display usually illuminates in yellow. When the distance is short, it illuminates in red.

        B0022MVE04
        Text in Illustration
        *1 Front Corner LH *2 Front Corner RH
        *3 Rear Corner LH *4 Rear Center
        *5 Rear Corner RH *6 Distance
        *7 Longest *8 Long
        *9 Middle *10 Short
        *11 Yellow *12 Red

      3. If an obstacle is detected when the monitor system*1 or parking assist monitor system*2 is activated, the approximate distance between the vehicle and the obstacle is displayed on the multi-display.


        • *1: Models with monitor system

        • *2: Models with parking assist monitor system

      4. The distance is displayed by color based on the actual distance to the obstacle. When an obstacle is detected at the long or middle distance, the indicator is yellow. The color changes from yellow to red when the distance becomes short.

        B0022B9E04
        Text in Illustration
        *1 Front Corner LH *2 Front Corner RH
        *3 Rear Corner LH *4 Rear Corner RH
        *5 Rear Center - -
        *a The illustrations shown are examples only. The illustrations may differ from the actual vehicle screens. - -

      5. Screens displaying warning messages relating to a No. 1 ultrasonic sensor malfunction, No. 1 ultrasonic sensor freezing, or presence of foreign matter on the No. 1 ultrasonic sensor, are displayed on the multi-display. The warning message appears in the same language that has been selected by the language selector of the multi-display.

        B0022HJE01
        Text in Illustration
        *1 Malfunctioning *2 Frozen/Dirty

      6. The display timing and detection distance can be customized using the multi-display.

        B0022GSE01
        Text in Illustration
        *A Models with Navigation System *B Models with Lexus Display Audio System

    5. Detection Area


      1. The detection areas of the No. 1 ultrasonic sensor are as shown in the following illustration.

      2. These detection areas are applicable when positioning a 60 mm (2.36 in.) diameter pole parallel or perpendicular to the ground. The ranges vary depending on the measuring method and type of obstacle.

        B0022MTE03
        Text in Illustration (Corner Area:)
        *a Approximately 850 mm (33.5 in.) *b Approximately 500 mm (19.7 in.)
        *c Approximately 600 mm (23.6 in.) *d Approximately 450 mm (17.7 in.)
        *e Approximately 200 mm (7.87 in.) - -
        B0022QIE03
        Text in Illustration (Rear Center Area:)
        *a Approximately 1800 mm (70.9 in.) *b Approximately 200 mm (7.87 in.)
        *c Approximately 1350 mm (53.1 in.) *d Approximately 600 mm (23.6 in.)

  5. DIAGNOSIS


    1. If a system malfunction is detected, the clearance warning ECU assembly stores Diagnostic Trouble Codes (DTCs) in its memory. For details, refer to the Repair Manual.