Lexus NX: Power Window Switch Malfunction (B2312)

Lexus NX Service Manual / Vehicle Exterior / Window / Glass / Power Window Control System / Power Window Switch Malfunction (B2312)

DESCRIPTION

The power window regulator motor assemblies are operated by the multiplex network master switch assembly, power window regulator switch assembly or rear power window regulator switch assemblies. The power window regulator motor assemblies have motor, regulator and ECU functions.

This DTC is output when an ECU built into a power window regulator motor assembly and multiplex network master switch assembly determines that the multiplex network master switch assembly, power window regulator switch assembly or rear power window regulator switch assembly is stuck.

Master Switch

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Multiplex network master switch assembly stuck Multiplex network master switch assembly held in same position for more than 20 seconds Multiplex network master switch assembly operated for 20 seconds or more	Multiplex network master switch assembly

D-Door Motor

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Multiplex network master switch assembly stuck Multiplex network master switch assembly held in same position for more than 20 seconds	Multiplex network master switch assembly Front power window regulator motor assembly LH Harness or connector

P-Door Motor

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Power window regulator switch assembly stuck Power window regulator switch assembly held in same position for more than 20 seconds	Power window regulator switch assembly Front power window regulator motor assembly RH Harness or connector

RL-Door Motor

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Rear power window regulator switch assembly (for rear LH door) stuck Rear power window regulator switch assembly (for rear LH door) held in same position for more than 20 seconds	Rear power window regulator switch assembly (for rear LH door) Rear power window regulator motor assembly LH Harness or connector

RR-Door Motor

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2312	Power Window Switch Malfunction	Rear power window regulator switch assembly (for rear RH door) stuck Rear power window regulator switch assembly (for rear RH door) held in same position for more than 20 seconds	Rear power window regulator switch assembly (for rear RH door) Rear power window regulator motor assembly RH Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

DTC B2312 is stored in the multiplex network master switch assembly and in each power window regulator motor assembly.
If a power window regulator motor assembly 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.
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

HINT:

If DTC B2312 is not output again after the DTC has been cleared, the DTC was output due to the switch being held.

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Master Switch > Clear DTCs Body Electrical > D-Door Motor > Clear DTCs Body Electrical > P-Door Motor > Clear DTCs Body Electrical > RL-Door Motor > Clear DTCs Body Electrical > RR-Door Motor > Clear DTCs

(b) Check for DTCs.

Click here

Body Electrical > Master Switch > Trouble Codes Body Electrical > D-Door Motor > Trouble Codes Body Electrical > P-Door Motor > Trouble Codes Body Electrical > RL-Door Motor > Trouble Codes Body Electrical > RR-Door Motor > Trouble Codes

OK:

DTC B2312 is not output.

END (DUE TO SWITCH BEING OPERATED FOR 20 SECONDS OR MORE)

2.	CHECK FOR DTC

(a) Check the parts which the DTCs have been output from.

Result	Proceed to
DTC output from Master Switch	A
DTC output from D-Door Motor	B
DTC output from P-Door Motor	C
DTC output from RL-Door Motor	D
DTC output from RR-Door Motor	E

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

GO TO STEP 7

GO TO STEP 10

GO TO STEP 13

3.	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	-

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.

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.

Standard Resistance:

Tester Connection	Condition	Specified Condition
M10-20 (UP) - Body ground	Always	10 kΩ or higher
M10-15 (DOWN) - Body ground	Always	10 kΩ or higher
M2-10 (UP) - Body ground	Always	10 kΩ or higher
M2-7 (DOWN) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Replace the multiplex network master switch assembly.

Click here

6.	CHECK FOR DTC

(a) Clear the DTCs.

Click here

Body Electrical > D-Door Motor > Clear DTCs

(b) Check for DTCs.

Click here

Body Electrical > D-Door Motor > Trouble Codes

OK:

DTC B2312 is not output.

END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

7.	READ VALUE USING TECHSTREAM (P-DOOR MOTOR)

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

Click here

Body Electrical > P-Door Motor > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
P Door P/W Auto SW	Front passenger door power window auto switch signal	OFF or ON	OFF: Front passenger door power window auto switch not being operated ON: Front passenger door power window auto 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	-
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	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

P Door P/W Auto SW

Front passenger door power window auto switch signal

OFF or ON

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

ON: Front passenger door power window auto 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

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

Body Electrical > P-Door Motor > Data List

Tester Display
P Door P/W Auto SW
P Door P/W Up SW
P Door P/W Down SW

OK:

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

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

8.	INSPECT POWER WINDOW REGULATOR SWITCH ASSEMBLY

(a) Remove the power window regulator switch assembly.

Click here

(b) Inspect the power window regulator switch assembly.

Click here

REPLACE POWER WINDOW REGULATOR SWITCH ASSEMBLY

9.	CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR SWITCH ASSEMBLY - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH)

(a) Disconnect the L11 power window regulator switch assembly connector.

(b) Disconnect the L2 front power window regulator motor assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
L11-5 (UP) - Body ground	Always	10 kΩ or higher
L11-8 (AUTO) - Body ground	Always	10 kΩ or higher
L11-4 (DOWN) - Body ground	Always	10 kΩ or higher
L2-10 (UP) - Body ground	Always	10 kΩ or higher
L2-4 (AUTO) - Body ground	Always	10 kΩ or higher
L2-7 (DOWN) - Body ground	Always	10 kΩ or higher

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	READ VALUE USING TECHSTREAM (RL-DOOR MOTOR)

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

Click here

Body Electrical > RL-Door Motor > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
RL Door P/W Auto SW	Rear LH door power window auto switch signal	OFF or ON	OFF: Rear LH door power window auto switch not being operated ON: Rear LH door power window auto switch being operated	-
RL Door P/W Up SW	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	-
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	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RL Door P/W Auto SW

Rear LH door power window auto switch signal

OFF or ON

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

ON: Rear LH door power window auto switch being operated

RL Door P/W Up SW

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

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

Body Electrical > RL-Door Motor > Data List

Tester Display
RL Door P/W Auto SW
RL Door P/W Up SW
RL Door P/W Down SW

OK:

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

REPLACE REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

11.	INSPECT REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY (FOR REAR LH DOOR)

(a) Remove the rear power window regulator switch assembly (for rear LH door).

Click here

(b) Inspect the rear power window regulator switch assembly (for rear LH door).

Click here

REPLACE REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY (FOR REAR LH DOOR)

12.	CHECK HARNESS AND CONNECTOR (REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY [FOR REAR LH DOOR] - REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY LH)

(a) Disconnect the O1 rear power window regulator switch assembly (for rear LH door) connector.

(b) Disconnect the O2 rear power window regulator motor assembly LH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
O1-5 (UP) - Body ground	Always	10 kΩ or higher
O1-4 (DOWN) - Body ground	Always	10 kΩ or higher
O1-8 (AUTO) - Body ground	Always	10 kΩ or higher
O2-10 (UP) - Body ground	Always	10 kΩ or higher
O2-7 (DOWN) - Body ground	Always	10 kΩ or higher
O2-4 (AUTO) - Body ground	Always	10 kΩ or higher

REPLACE REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	READ VALUE USING TECHSTREAM (RR-DOOR MOTOR)

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

Click here

Body Electrical > RR-Door Motor > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RR Door P/W Auto SW

Rear RH door power window auto switch signal

OFF or ON

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

ON: Rear RH door power window auto switch being operated

RR Door P/W Up SW

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

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

Body Electrical > RR-Door Motor > Data List

Tester Display
RR Door P/W Auto SW
RR Door P/W Up SW
RR Door P/W Down SW

OK:

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

REPLACE REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

14.	INSPECT REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY (FOR REAR RH DOOR)

(a) Remove the rear power window regulator switch assembly (for rear RH door).

Click here

(b) Inspect the rear power window regulator switch assembly (for rear RH door).

Click here

REPLACE REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY (FOR REAR RH DOOR)

15.	CHECK HARNESS AND CONNECTOR (REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY [FOR REAR RH DOOR] - REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY RH)

(a) Disconnect the N1 rear power window regulator switch assembly (for rear RH door) connector.

(b) Disconnect the N2 rear power window regulator motor assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N1-5 (UP) - Body ground	Always	10 kΩ or higher
N1-4 (DOWN) - Body ground	Always	10 kΩ or higher
N1-8 (AUTO) - Body ground	Always	10 kΩ or higher
N2-10 (UP) - Body ground	Always	10 kΩ or higher
N2-7 (DOWN) - Body ground	Always	10 kΩ or higher
N2-4 (AUTO) - Body ground	Always	10 kΩ or higher

REPLACE REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

REPAIR OR REPLACE HARNESS OR CONNECTOR

SEE MORE:

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