Lexus NX: Driver Side Power Window does not Operate with Power Window Master Switch

Lexus NX Service Manual / Vehicle Exterior / Window / Glass / Power Window Control System / Driver Side Power Window does not Operate with Power Window Master Switch

DESCRIPTION

When the power switch is on (IG), the front power window regulator motor assembly LH is operated by the multiplex network master switch assembly. The front power window regulator motor assembly LH has motor, regulator and ECU functions.

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

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
  • If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (MAIN BODY)

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

Click here

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Communication D-Door Motor

Connection status between front power window regulator motor assembly LH 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 D-Door Motor

Communication Master SW

OK:

On the Techstream screen, OK is displayed.

NG

GO TO LIN COMMUNICATION SYSTEM

OK

2.

READ VALUE USING TECHSTREAM (D-DOOR MOTOR)

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

Click here

Body Electrical > D-Door Motor > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

D Door P/W Up SW

Driver door power window manual up switch signal

OFF or ON

OFF: Driver door power window manual up switch not being operated

ON: Driver door power window manual up switch being operated

-

D Door P/W Down SW

Driver door power window manual down switch signal

OFF or ON

OFF: Driver door power window manual down switch not being operated

ON: Driver door power window manual down switch being operated

-

Body Electrical > D-Door Motor > Data List

Tester Display

D Door P/W Up SW

D Door P/W Down SW

OK:

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

NG

GO TO STEP 4

OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM (D-DOOR MOTOR)

(a) Perform the Active Test according to the display on the Techstream.

Click here

CAUTION:

Be careful to avoid injuries as this test causes vehicle parts to move. During the Active Test, the jam protection function will not operate.

Body Electrical > D-Door Motor > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Power Window

Power window

OFF / DOWN / UP

-

Body Electrical > D-Door Motor > Active Test

Tester Display

Power Window

HINT:

Up and down movement does not occur if the arrow is not pressed and held.

OK:

Driver door power window operates normally.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

4.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH)

(a) Disconnect the M10 multiplex network master switch assembly connector.

(b) Disconnect the M2 front power window regulator motor assembly LH connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

M10-20 (UP) - M2-10 (UP)

Always

Below 1 Ω

M10-15 (DOWN) - M2-7 (DOWN)

Always

Below 1 Ω

M10-20 (UP) or M2-10 (UP) - Body ground

Always

10 kΩ or higher

M10-15 (DOWN) or M2-7 (DOWN) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Replace the multiplex network master switch assembly.

Click here

NEXT

6.

CHECK MANUAL UP / DOWN FUNCTION (FOR DRIVER DOOR)

(a) Check that the driver door power window moves when the manual up and down function of the power window regulator master switch assembly is operated.

Click here

OK:

Driver door manual up and down function is normal.

OK

END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

NG

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

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