Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Key-off Operation Function Operates even if Operating Conditions are not Satisfied

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Window / Glass / Power Window Control System / Key-off Operation Function Operates even if Operating Conditions are not Satisfied

DESCRIPTION

When the front doors are closed, each power window regulator motor assembly can be operated for approximately 45 seconds after the engine switch is turned from on (IG) to off by receiving operation permission signals from the main body ECU (multiplex network body ECU). However, when approximately 45 seconds have elapsed, or the driver door or front passenger door is opened within approximately 45 seconds of the engine switch being turned off, the power window regulator motor assemblies stop operating.

During auto operation, when 45 seconds have elapsed and key-off operation is prohibited, the power window stops immediately.

CAUTION / NOTICE / HINT

NOTICE:

  • The power window control system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power window control system after confirming that the communication system is functioning properly.

    Click here

  • If a power window regulator motor assembly has been replaced with a new one, initialize the power window control system.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here

PROCEDURE

1.

CHECK MANUAL UP / DOWN FUNCTION

(a) Check that the manual up and down functions using the multiplex network master switch assembly, power window regulator switch assembly and rear power window regulator switch assembly (for LH or RH door) can operate the power windows.

Click here

OK:

Manual up and down functions are normal.

NG

GO TO OTHER PROBLEM (Proceed to Problem Symptoms Table)

OK

2.

CHECK REMOTE UP / DOWN FUNCTION

(a) Check that the remote up and down functions using the multiplex network master switch assembly can operate all of the power windows.

Click here

OK:

Remote up and down functions are normal.

NG

GO TO OTHER PROBLEM (Proceed to Problem Symptoms Table)

OK

3.

CHECK KEY-OFF OPERATION FUNCTION

(a) Check the key-off operation function.

Click here

Result

Proceed to

Power window can be operated even after opening driver door or front passenger door within approximately 45 seconds of engine switch being turned off

A

Power window can be operated even after approximately 45 seconds have elapsed since engine switch was turned off (for All Doors)

B

Power window can be operated even after approximately 45 seconds have elapsed since engine switch was turned off (for Driver Door or Front Passenger Door)

C

Power window can be operated even after approximately 45 seconds have elapsed since engine switch was turned off (for Rear LH Door or Rear RH Door)

D
B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

C

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR DRIVER DOOR OR FRONT PASSENGER DOOR)

D

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR REAR LH DOOR OR REAR RH DOOR)

A

4.

READ VALUE USING TECHSTREAM (MAIN BODY)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Door Courtesy SW

Front door courtesy light switch assembly (for RH) signal

OFF or ON

OFF: Front door RH closed

ON: Front door RH open

-

FL Door Courtesy SW

Front door courtesy light switch assembly (for LH) signal

OFF or ON

OFF: Front door LH closed

ON: Front door LH open

-
Body Electrical > Main Body > Data List

Tester Display

FR Door Courtesy SW

FL Door Courtesy SW

OK:

On the Techstream screen, ON or OFF is displayed accordingly.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

GO TO LIGHTING SYSTEM (Proceed to Front Door Courtesy Switch Circuit)

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