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 combination meter assembly, rear television camera assembly*1, parking assist ECU*2 or radio receiver assembly*3.

    • Sounds the No. 1 clearance warning buzzer.
    No. 1 Ultrasonic Sensor (2) Detects the distance between the vehicle and an obstacle.
    No. 2 Ultrasonic Sensor (2)
    No. 3 Ultrasonic Sensor (2)
    No. 4 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.
    Headup Display*4 Displays the location of an obstacle and the approximate distance between the vehicle and the obstacle.
    Rear Television Camera Assembly*1

    • Captures images of the area behind the vehicle.

    • The clearance sonar information is superimposed on the captured image. Then, the image is sent to the multidisplay assembly as video signals.
    Parking Assist ECU*2 The clearance sonar information is superimposed on the captured image. Then, the image is sent to the multidisplay assembly as video signals.
    Radio Receiver Assembly

    • Sends the setup signal for the LEXUS parking assist-sensor system to the clearance warning ECU assembly.

    • The clearance sonar information is superimposed on the captured image. Then, the image is sent to the multi-display assembly as video signals.*3
    Steering Pad Switch Assembly Sends operation signals from switches to the spiral cable with sensor sub-assembly.
    Spiral Cable Sub-assembly Sends operation signals from the steering pad switch assembly to the radio receiver assembly.
    Shift Lever Position Sensor Sends the shift position signal to the hybrid vehicle control ECU assembly.
    Hybrid Vehicle Control ECU Assembly Sends the shift position signal to the clearance warning ECU assembly.
    Skid Control ECU Assembly Sends the vehicle speed signal to the clearance warning ECU assembly.
    Air Conditioner Amplifier Assembly Sends outside temperature information to the clearance warning ECU assembly.
    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.

    *1: Models with parking assist monitor system (without parallel parking assist mode)

    *2: Models with panoramic view monitor system

    *3: Models with parking assist monitor system (with parallel parking assist mode)

    *4: Models with headup display

  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

        B0055PIC01
        *a Approximately 800 mm (31.5 in.) *b Approximately 600 mm (23.6 in.)
        *c Approximately 800 mm (31.5 in.) *d Approximately 420 mm (16.5 in.)
        *e Approximately 200 mm (7.87 in.) *f Approximately 420 mm (16.5 in.)
        *g Approximately 500 mm (19.7 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

        B0055BCC01
        *a

        Approximately 1650 mm (65.0 in.) (Except F SPORT)

        Approximately 2000 mm (78.7 in.) (F SPORT)

        		 *b Approximately 1000 mm (39.4 in.)
        *c Approximately 1500 mm (59.1 in.) *d Approximately 1900 mm (74.8 in.)
        *e

        Approximately 300 mm (11.8 in.) (Except F SORT)

        Approximately 600 mm (23.6 in.) (F SPORT)

        		 *f Approximately 200 mm (7.87 in.)
        *g Approximately 300 mm (11.8 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

      • Power 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

      • Power 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

      • Power switch is on (IG).

      • System is activated.

      • Shift lever is in R.

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

      • Power switch is on (IG).

      • System is activated.

      • Shift lever is in R.

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

  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.