LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2018 >> RC F >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window Control System - Diagnostics - Introduction >> Power Window Control System >> System Description [09/2014 - ] >> System Description [09/2014 - ]
April 5, 2026: LEMON Manuals is launched! Read the announcement.

System Description [09/2014 - ]

  1. POWER WINDOW CONTROL SYSTEM DESCRIPTION 
    1. The power window control system controls the power window operation using the power window regulator motor assemblies. The main controls of this system are the multiplex network master switch assembly (mounted on the driver door) and power window regulator switch assembly (mounted on the front passenger door). Operating a window switch results in electrical power being transmitted to the corresponding power window regulator motor assembly.
  2. FUNCTION OF MAIN COMPONENTS 

    The power window control system consists of the following components:

    Component Outline
    Multiplex Network Master Switch Assembly
    • Controls power window operation for all of the windows.
    • Cannot be used to operate all of the power windows when the window lock switch is on (indicator is illuminated).
    Power Window Regulator Switch Assembly
    • Located on the front passenger door.
    • Controls the front passenger power window operation.
    Power Window Regulator Motor Assembly
    • Receives switch signals and changes signals into motor activation. As a result, the power window position changes.
    • Uses the Hall-ICs built into the regulator motor and the power window ECUs to detect the power window position and jamming.
  3. SYSTEM FUNCTION 

    The power window control system has the following functions:

    Function Outline
    Manual up and down function Function that causes the power window to go up while the power window switch is being pulled halfway up and to go down while it is being pushed halfway down. The power window stops as soon as the switch is released.
    Auto up and down function Function that enables the power window of each door to be fully opened or closed by one full pull or push of the multiplex network master switch assembly or power window regulator switch assembly.
    Window lock function
    • Function that disables the power window regulator switch assembly operations when the window lock switch is on.
    • The power window regulator switch assembly can be operated when the window lock switch is off.
    Jam protection function Function that automatically stops the power window and moves it downward if a foreign object gets jammed in the power window during auto up or manual up operation.
    Catch protection function Function that automatically stops the power window if something gets caught between the door and door glass during auto down or manual down operation.
    Remote control function Function that allows the multiplex network master switch assembly to control manual and auto up and down operations of the front passenger door power window.
    Key-off operation function
    • Function that makes it possible to operate all power windows for approximately 43 seconds after the engine switch is turned off when the driver door or front passenger door has not been opened.
    • When 43 seconds have elapsed, or the driver door or front passenger door is opened after the engine switch is turned off, the key-off operation function will be disabled.
    HINT: If a power window is being operated by auto operation while the key-off operation function is on, and the driver door or front passenger door is opened, the power window will stop operating.
    Key-linked function*
    • When the key is not inside the vehicle, the driver door is locked, and the key inserted into the driver door key cylinder is turned and maintained in the lock position for 1.5 seconds or more, the main body ECU (multiplex network body ECU) activates the power window regulator motor assemblies to close all power windows while the key is being turned.
    • Similarly, when the driver door is unlocked, turning the key to the unlock position for 1.5 seconds or more will cause all power windows to open.
    Wireless transmitter-linked function* When the main body ECU (multiplex network body ECU) receives an UNLOCK signal from the electrical key transmitter sub-assembly for 2.4 seconds or more, the main body ECU (multiplex network body ECU) sends an operation request signal to the power window ECU in each power window regulator motor assembly. As a result, the power window regulator motors open all power windows.
    Window open warning function When the engine switch is turned from on (IG) to off and the driver door is opened with the power window open, the buzzer in the combination meter assembly sounds once. Then, a warning message appears on the multi-information display.
    Diagnosis Function that allows diagnosis of the power window control system if any of the power window ECUs (built into each power window regulator motor assembly) detects a malfunction in the system.
    Door-linked Window Control When a door is opened with its power window fully closed, the power window will automatically lower a slight amount and then fully close when the door is closed.
    Fail-safe
    • Function to disable part of power window control system functions if the pulse sensor in the power window regulator motor has a malfunction.
    • Auto up and down function and remote control function are disabled.
    1. *: This function is set through the customize setting, as it is off by default.
scientia non olet · About LEMON Manuals