Lexus NX manuals

Lexus NX: System Description

Lexus NX Service Manual / Vehicle Exterior / Window / Glass / Power Window Control System / System Description

SYSTEM DESCRIPTION

POWER WINDOW CONTROL SYSTEM DESCRIPTION

(a) The power window control system controls the power window operation using the power window regulator motors. The main controls of this system are the multiplex network master switch assembly (mounted on the driver door), power window regulator switch assembly (mounted on the front passenger door) and rear power window regulator switch assemblies (mounted on the rear doors). Operating a window switch results in electrical power being transmitted to the corresponding power window regulator motor.

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 windows.
  • When the lock switch is set to the lock position, window operation will be possible for all windows.

Power window regulator switch assembly
  • Located on the front passenger door.
  • Controls front passenger window operation.
  • Rear power window regulator switch assembly (for Rear RH Door)
  • Rear power window regulator switch assembly (for Rear LH Door)
  • Located on the rear doors.
  • Each switch controls window operation for its respective window.
  • Front power window regulator motor assembly RH
  • Front power window regulator motor assembly LH
  • Rear power window regulator motor assembly LH
  • Rear power window regulator motor assembly RH
  • Receives switch signals and changes signals into motor activation. As a result, the window position changes.
  • Uses the Hall-ICs built into the regulator motor and the power window ECUs to detect the window position and jamming.

SYSTEM FUNCTION

The power window control system has the following functions:

Function

Outline
*: This function is set through the customize function, as it is off by default.

Click here

Manual up and down function

Function that causes the 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 window stops as soon as the switch is released.

Auto up and down function

Function that enables the window of each door to be fully opened or closed by one full pull or push of the multiplex network master switch assembly, power window regulator switch assembly or rear power window regulator switch assembly.

Window lock function
  • Function that disables the power window regulator switch assembly and rear power window regulator switch assembly operations when the window lock switch is pressed.
  • The power window regulator switch assembly and rear power window regulator switch assembly can be operated when the window lock switch is pressed again.

Jam protection function

Function that automatically stops the power window and moves it downward if a foreign object gets jammed in the door window during auto up or manual up operation.

Catch protection function

Function that automatically stops the power window if a foreign object gets caught in the door window 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 window and rear door windows.

Key-off operation function
  • Function that makes it possible to operate all power windows for approximately 43 seconds after the power switch is turned off when the driver door or front passenger door has not been opened.
  • When approximately 43 seconds have elapsed, or the driver door or front passenger door is opened after the power switch is turned off, the key-off operation function will be disabled.

HINT:

Even if the driver door or passenger door is opened during automatic window operation while the key-off operation function is on, the window will continue 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 and maintaining the driver door key in 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 3 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.
  • When the main body ECU (multiplex network body ECU) receives a LOCK signal from the electrical key transmitter sub-assembly for 3 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 close all power windows.

Window open warning function

When the power switch is turned from on (IG) to off and the driver door is opened with the window open, the buzzer in the combination meter assembly sounds once. Then, a warning message appears on the combination meter assembly.

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.

Fail-safe
  • Function to disable part of the 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.

READ NEXT:

 How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the power window control system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT

 Operation Check

OPERATION CHECK CHECK WINDOW LOCK FUNCTION (a) Turn the power switch on (IG). (b) Press the window lock switch of the multiplex network master switch assembly. HINT: The illumination (LED) built into

 Customize Parameters

CUSTOMIZE PARAMETERS CUSTOMIZE POWER WINDOW CONTROL SYSTEM HINT: The following items can be customized. NOTICE: When the customer requests a change in a function, first make sure that the function

SEE MORE:

 CAN Communication Failure (Message Registry) (U1000)

DESCRIPTION When the clearance warning ECU assembly determines that the CAN communication circuit is malfunctioning during self-diagnosis, DTC U1000 is stored. DTC No. Detection Item DTC Detection Condition Trouble Area U1000 CAN Communication Failure (Message Registry) CAN communic

 Removal

REMOVAL PROCEDURE 1. REMOVE CONSOLE ARMREST ASSEMBLY (for Front Side) Click here 2. REMOVE UPPER NO. 2 CONSOLE PANEL GARNISH (for Front Side) Click here 3. REMOVE DOOR SCUFF PLATE ASSEMBLY LH (for Front Side) Click here 4. REMOVE COWL SIDE TRIM BOARD LH (for Front Side) Click here

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