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 ultrasonic sensors. Output signals are sent to the multi-information display or multi-display assembly.

    • Sounds the No. 1 clearance warning buzzer.
    No. 1 Ultrasonic Sensor (6) Detects the distance between the vehicle and an obstacle.
    No. 2 Ultrasonic Sensor (2)
    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 an ultrasonic sensor to inform the driver.
    Master Warning Light Illuminates in accordance with the indication on the multi-information display.
    Multi-display Assembly

    • 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 an 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.
    Network Gateway ECU Transmits data between the CAN V bus and CAN sub bus 2.
    Park/Neutral Position Switch Assembly Transmits the shift position signal to the ECM.
    ECM Transmits the shift position signal to the clearance warning ECU assembly.

  2. SYSTEM CONTROL


    1. Detection Area


      1. The detection areas of the 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.

        Figure 1. Corner Area

        A01200EC01
        *a Approximately 850 mm (33.5 in.) *b Approximately 500 mm (19.7 in.)
        *c Approximately 600 mm (23.6 in.) *d Approximately 950 mm (37.4 in.)
        *e Approximately 450 mm (17.7 in.) *f Approximately 200 mm (7.87 in.)

        Note

        The ultrasonic sensor side view detection range area (labeled*1) represents the cross section of the top view of the lines of detection range A. The area *1 does not represent the entire side view detection range.

        Figure 2. Center Area

        A0120FNC01
        *a Approximately 1900 mm (74.8 in.) *b Approximately 1000 mm (39.4 in.)
        *c Approximately 1350 mm (53.1 in.) *d Approximately 1800 mm (70.9 in.)
        *e Approximately 600 mm (23.6 in.) *f Approximately 200 mm (7.87 in.)

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

      Installation Position Operating Condition
      Front Corner

      • Engine switch is on (IG).

      • System is activated.

      • Shift lever is in a position other than P.

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

      • Engine switch is on (IG).

      • System is activated.

      • Shift lever is in a position other than P and R.

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

      • Engine switch is on (IG).

      • System is activated.

      • Shift lever is in R.
      Rear Center

      • Engine switch is on (IG).

      • System is activated.

      • Shift lever is in R.

  3. 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.