Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Remote Up / Down Function does not Operate

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Window / Glass / Power Window Control System / Remote Up / Down Function does not Operate

DESCRIPTION

When the engine switch is on (IG), the multiplex network master switch assembly sends remote up and down signals to each power window regulator motor assembly via LIN communication.

WIRING DIAGRAM

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

PROCEDURE

1.

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

Communication P-Door Motor

Connection status between power window regulator motor assembly (for front passenger door) and main body ECU (multiplex network body ECU)

STOP or OK

STOP: Communication stopped

OK: Normal communication

-

Communication RR-Door Motor

Connection status between power window regulator motor assembly (for rear RH door) and main body ECU (multiplex network body ECU)

STOP or OK

STOP: Communication stopped

OK: Normal communication

-

Communication RL-Door Motor

Connection status between power window regulator motor assembly (for rear LH door) and main body ECU (multiplex network body ECU)

STOP or OK

STOP: Communication stopped

OK: Normal communication

-

Communication Master SW

Connection status between multiplex network master switch assembly and main body ECU (multiplex network body ECU)

STOP or OK

STOP: Communication stopped

OK: Normal communication

-
Body Electrical > Main Body > Data List

Tester Display

Communication P-Door Motor

Communication RR-Door Motor

Communication RL-Door Motor

Communication Master SW

OK:

OK is displayed for each Data List item above.

NG

GO TO LIN COMMUNICATION SYSTEM (Proceed to How to Proceed with Troubleshooting)

OK

2.

READ VALUE USING TECHSTREAM (MASTER SWITCH)

(a) Enter the following menus: Body Electrical / Master Switch / Data List.

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

Body Electrical > Master Switch > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

P Door P/W Auto SW

Front passenger door door power window auto switch signal

OFF or ON

OFF: Front passenger door power window auto up or auto down switch not being operated

ON: Front passenger door power window auto up or auto down switch being operated

-

RR Door P/W Auto SW

Rear RH door door power window auto switch signal

OFF or ON

OFF: Rear RH door power window auto up or auto down switch not being operated

ON: Rear RH door power window auto up or auto down switch being operated

-

RL Door P/W Auto SW

Rear LH door door power window auto switch signal

OFF or ON

OFF: Rear LH door power window auto up or auto down switch not being operated

ON: Rear LH door power window auto up or auto down switch being operated

-

P Door P/W Up SW

Front passenger door power window manual up switch signal

OFF or ON

OFF: Front passenger door power window manual up switch not being operated

ON: Front passenger door power window manual up switch being operated

-

RR Door P/W up switch

Rear RH door power window manual up switch signal

OFF or ON

OFF: Rear RH door power window manual up switch not being operated

ON: Rear RH door power window manual up switch being operated

-

RL Door P/W up switch

Rear LH door power window manual up switch signal

OFF or ON

OFF: Rear LH door power window manual up switch not being operated

ON: Rear LH door power window manual up switch being operated

-

P Door P/W Down SW

Front passenger door power window manual down switch signal

OFF or ON

OFF: Front passenger door power window manual down switch not being operated

ON: Front passenger door power window manual down switch being operated

-

RR Door P/W Down SW

Rear RH door power window manual down switch signal

OFF or ON

OFF: Rear RH door power window manual down switch not being operated

ON: Rear RH door power window manual down switch being operated

-

RL Door P/W Down SW

Rear LH door power window manual down switch signal

OFF or ON

OFF: Rear LH door power window manual down switch not being operated

ON: Rear LH door power window manual down switch being operated

-

Window Lock Switch Status

Window lock switch signal

OFF or ON

OFF: Window lock switch off (not pushed in)

ON: Window lock switch on (pushed in)

-
Body Electrical > Master Switch > Data List

Tester Display

P Door P/W Auto SW

RR Door P/W Auto SW

RL Door P/W Auto SW

P Door P/W Up SW

RR Door P/W up switch

RL Door P/W up switch

P Door P/W Down SW

RR Door P/W Down SW

RL Door P/W Down SW

Window Lock Switch Status

OK:

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

Result

Proceed to

NG

A

OK (Front passenger door power window remote up and down functions do not operate)

B

OK (Rear LH door power window remote up and down functions do not operate)

C

OK (Rear RH door power window remote up and down functions do not operate)
A

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

B

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

C

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

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