LEXUS PARKING ASSIST-SENSOR SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. The components have the following functions:

      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*1.

      • Sounds the No. 1 clearance warning buzzer.
      No. 1 Ultrasonic Sensor 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 an ultrasonic sensor to inform the driver.
      Master Warning Light Illuminates in accordance with the indication on the multi-information display.
      Multi-display Assembly*1

      • 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*1 Transmits the setup signal for the Lexus parking assist-sensor system to the clearance warning ECU assembly.
      Parking Assist ECU*2 Outputs the cooperative display video signal for the panoramic view monitor screen to the radio receiver assembly based on signals from the clearance warning ECU assembly.
      Lexus Display Audio Controller (Remote Operation Controller Assembly)*3 Transmits operation signals to the radio receiver assembly.
      Remote Touch (Remote Operation Controller Assembly)*4
      Back Sonar or Clearance Sonar Switch Operating this switch allows the operation of the Lexus parking assist-sensor system to be enabled or disabled.
      Shift Lever Position Sensor Transmits the shift position signal to the hybrid vehicle control ECU.
      Hybrid Vehicle Control ECU Transmits the shift position signal to the clearance warning ECU assembly.

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

      • *2: Models with panoramic view monitor system

      • *3: Models with Lexus display audio system

      • *4: Models with navigation system

  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

        A01H2QPC01
        *a Approximately 900 mm (35.4 in.) *b Approximately 200 mm (7.87 in.)
        *c Approximately 400 mm (15.7 in.) *d Approximately 550 mm (21.7 in.)
        *e Approximately 300 mm (11.8 in.) *f Approximately 200 mm (7.87 in.)
        *g Approximately 340 mm (13.4 in.) *h Detection Area

        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

        A01H2QGC01
        *a Approximately 1840 mm (72.4 in.) *b Approximately 960 mm (37.8 in.)
        *c Approximately 200 mm (7.87 in.) *d Approximately 1500 mm (59.1 in.)
        *e Approximately 1280 mm (50.4 in.) *f Approximately 1600 mm (63 in.)
        *g Approximately 560 mm (22 in.) *h Approximately 220 mm (8.7 in.)
        *i Approximately 270 mm (10.6 in.) *j Approximately 720 mm (28.3 in.)
        *k Detection Area - -

    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

      • Power switch is on (IG).

      • System is activated.

      • Shift lever is not in P.

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

      • Power switch is on (IG).

      • System is activated.

      • Shift lever is not in P and R.

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

      • Power switch is on (IG).

      • System is activated.

      • Shift lever is in R.
      Rear Center

      • Power 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.