PARKING ASSIST MONITOR SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Models without Parallel Parking Assist Mode
    Component Function
    Rear Television Camera Assembly

    • Captures images of the area behind the vehicle.

    • The parking assist guide lines that are calculated based on signals from the steering sensor are superimposed on the captured image. Then, the image is sent to the multi-display assembly as video signals.

    • When the back door is open, superimposing of parking assist guide lines is canceled and only the captured image is sent as video signals.
    Multi-display Assembly Receives visual signals composed of the area behind the vehicle with parking assist guide lines overlaid from the rear television camera assembly, and displays them.
    Radio Receiver Assembly Sends signals indicating a mode change in parking guide line display functions to the rear television camera assembly.
    Steering Sensor Detects the angle of the steering wheel and sends the resulting signals to the rear television camera assembly.
    Park/Neutral Position Switch Assembly Sends an R shift position signal to the ECM.
    ECM Sends an R shift position signal to the radio receiver assembly.
    Clearance Warning ECU Assembly*1 Sends clearance sonar information to the rear television camera assembly.
    Blind Spot Monitor Sensor LH*2 Sends RCTA information to the rear television camera assembly.
    Back Door Lock Assembly Sends the back door courtesy switch signal to the power back door ECU (multiplex network door ECU)*3 or main body ECU (multiplex network body ECU)*4.
    Power Back Door ECU (Multiplex Network Door ECU)*3 Sends the back door courtesy switch signal to the main body ECU (multiplex network body ECU).
    Main Body ECU (Multiplex Network Body ECU) Sends the back door courtesy switch signal to the rear television camera assembly.

    *1: Models with LEXUS parking assist-sensor system

    *2: Models with blind spot monitor system

    *3: Models with power back door system

    *4: Except models with power back door system

    Models with Parallel Parking Assist Mode
    Component Function
    Radio Receiver Assembly Displays images of the area behind the vehicle sent from the rear television camera assembly using the multi-display assembly. The image is combined with the parking assist guide lines that are calculated based on signals from the steering sensor.
    Multi-display Assembly Receives visual signals composed of the area behind the vehicle with parking assist guide lines overlaid from the radio receiver assembly, and displays them on the multi-display assembly.
    Rear Television Camera Assembly Captures images of the area behind the vehicle and outputs visual signals to the radio receiver assembly.
    Steering Sensor Detects the angle of the steering wheel and sends the resulting signals to the radio receiver assembly.
    Park/Neutral Position Switch Assembly Sends an R shift position signal to the ECM.
    ECM Sends an R shift position signal to the radio receiver assembly.
    Combinatin Meter Assembly Sends the vehicle speed signal to the radio receiver assembly.
    Clearance Warning ECU Assembly*1 Sends clearance sonar information to the radio receiver assembly.
    Blind Spot Monitor Sensor LH*2 Sends RCTA information to the radio receiver assembly.
    Back Door Lock Assembly Sends the back door courtesy switch signal to the power back door ECU (multiplex network door ECU)*3 or main body ECU (multiplex network body ECU)*4.
    Power Back Door ECU (Multiplex Network Door ECU)*3 Sends the back door courtesy switch signal to the main body ECU (multiplex network body ECU).
    Main Body ECU (Multiplex Network Body ECU) Sends the back door courtesy switch signal to the radio receiver assembly.

    *1: Models with LEXUS parking assist-sensor system

    *2: Models with blind spot monitor system

    *3: Models with power back door system

    *4: Except models with power back door system

  2. SYSTEM CONTROL


    1. The parking assist monitor system operates when both of the following conditions are met:


      • The engine switch is on (IG).

      • The shift lever is in R.

  3. FUNCTION


    1. Area Displayed on Screen


      1. Objects on the right of the vehicle appear on the right side of the multi-display assembly, and objects on the left of the vehicle appear on the left side of the multi-display assembly.

      2. The rear television camera assembly uses a wide-angle lens. The perceived distance from images that appear on the screen differs from the actual distance.

        A01R807

        The illustration shown is an example only. The illustration may differ from the actual vehicle screen.

        Note

        The area displayed on the screen may vary according to vehicle status or road conditions. The area covered by the rear television camera assembly is limited. The rear television camera assembly does not show objects close to either corner of the bumper or show the area under the bumper.

    2. Warning Message


      1. A warning message appears at the bottom or center of the screen under the following conditions. The warning message appears in the same language that has been selected by the language selector of the multi-display assembly.

        Messages Appearing at Bottom of Screen
        Warning Message Condition
        Check surroundings for safety. This message always appears during system operation.
        System initializing.* This message appears when the steering wheel is operated while the battery terminal (-) is disconnected and then is reconnected.
        Guidance unavailable.* This message appears if there is a malfunction in this system.

        *: Models with paralell parking assist mode

        Message Appearing at Center of Screen
        Warning Message Condition
        System not ready.* This message appears if the system is not initialized.

        *: Models with parallel parking assist mode

    3. Calibration Following Parts Replacement


      • The items listed below must always be adjusted whenever one of the following conditions occurs. For details, refer to the Repair Manual.

        Adjustment Items Condition
        Neutral steering point in memory

        • Estimated course guide lines are not displayed.*1

        • System initializing is displayed.*2
        Steering angle setting

        • After the spiral cable sub-assembly or steering sensor is removed and installed or after a connector is disconnected and reconnected, system initializing is displayed.

        • Steering sensor replacement.
        Backing-up camera position setting

        • Vehicle height has changed due to replacement of suspension parts or tires.

        • The installation angle of the rear television camera assembly has changed.
        Parking assist monitor system initialization Rear television camera assembly*1 or radio receiver assembly*2 is replaced.

        *1: Models without parallel parking assist mode

        *2: Models with parallel parking assist mode

  4. FAIL-SAFE


    1. The table below indicates the malfunction detection items for the components in this system.

      Models without Parall Parking Assist Mode
      Malfunctioning Parts Detection Item Function
      Steering Sensor

      • Sensor malfunction is detected

      • Sensor open circuit signal is detected

      • Communication malfunction between the steering sensor and rear television camera assembly

      		 Stops system operation
      Neutral steering point correction incomplete signal is detected
      Rear Television Camera Assembly Camera malfunction signal is detected Stops signal reception and displays a dark screen
      Models with Parall Parking Assist Mode
      Malfunctioning Parts Detection Item Function
      Steering Sensor

      • Sensor malfunction is detected

      • Sensor open circuit signal is detected

      • Communication malfunction between the steering sensor and radio receiver assembly

      		 Displays "Guidance unavailable"
      Neutral steering point correction incomplete signal is detected Displays "System initializing"
      Rear Television Camera Assembly Camera malfunction signal is detected Stops signal reception and displays a dark screen
      Radio Receiver Assembly Malfunction of radio receiver assembly Stops system operation

  5. DIAGNOSIS


    1. The radio receiver assembly is equipped with a diagnosis function which can display a diagnosis menu for the parking assist monitor system. The method for entering the diagnosis menu screen is the same as the method used for the multi-display assembly. For details, refer to the Repair Manual.