Toyota Tacoma (2015-2018) Service Manual: Power Window Switch Malfunction (B2312)

Toyota Tacoma (2015-2018) Service Manual / Window / Glass / Power Window Control System(w/ Jam Protection Function) / Power Window Switch Malfunction (B2312)

DESCRIPTION

The power window regulator motor assembly is operated by the power window regulator master switch assembly or power window regulator switch assembly. The power window regulator motor assembly has motor, regulator and ECU functions.

This DTC is output when the ECU built into the regulator motor determines that the power window regulator master switch assembly or power window regulator switch assembly is stuck.

HINT:

DTC B2312 can be stored in the power window regulator master switch assembly and in each power window regulator motor assembly (power window ECU).

Master Switch

DTC No.	DTC Detection Condition	Trouble Area
B2312	Power window regulator master switch assembly stuck Power window regulator master switch assembly held in same position for more than 20 seconds	Power window regulator master switch assembly

D-Door Motor (Front Power Window Regulator Motor Assembly LH)

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

P-Door Motor (Front Power Window Regulator Motor Assembly RH)

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

DTC B2312 is stored in the power window regulator 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 (See page ).
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 (See page ).

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Clear the DTC (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page OK: ).

OK:

No DTCs output.

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

2.	CHECK DTC OUTPUT

(a) Check for DTC output conditions.

Result

Result	Proceed to
DTC output from power window regulator master switch assembly	A
DTC output from front power window regulator motor assembly LH	B
DTC output from front power window regulator motor assembly RH	C

REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

GO TO STEP 7

3.	READ VALUE USING TECHSTREAM (D-DOOR MOTOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / D-Door Motor / Data List.

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

D-Door Motor (Front Power Window Regulator Motor Assembly LH)

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
D Door P/W Up SW	Driver side power window manual up switch signal / ON or OFF	ON: Driver side power window manual up switch operated OFF: Driver side power window manual up switch not operated	-
D Door P/W Down SW	Driver side power window manual down switch signal / ON or OFF	ON: Driver side power window manual down switch operated OFF: Driver side power window manual down switch not operated	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

D Door P/W Up SW

Driver side power window manual up switch signal / ON or OFF

ON: Driver side power window manual up switch operated

OFF: Driver side power window manual up switch not operated

D Door P/W Down SW

Driver side power window manual down switch signal / ON or OFF

ON: Driver side power window manual down switch operated

OFF: Driver side power window manual down switch not operated

OK:

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

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

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

(a) for Double Cab:

(1) Disconnect the P18 power window regulator master switch assembly connector.

(2) Disconnect the P24 front power window regulator motor assembly LH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
P18-4 (UP) - Body ground	Always	10 kΩ or higher
P18-5 (DOWN) - Body ground	Always	10 kΩ or higher
P24-10 (UP) - Body ground	Always	10 kΩ or higher
P24-7 (DOWN) - Body ground	Always	10 kΩ or higher

(b) for Access Cab:

(1) Disconnect the P23 power window regulator master switch assembly connector.

(2) Disconnect the P24 front power window regulator motor assembly LH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
P23-20 (UP) - Body ground	Always	10 kΩ or higher
P23-15 (DOWN) - Body ground	Always	10 kΩ or higher
P24-10 (UP) - Body ground	Always	10 kΩ or higher
P24-7 (DOWN) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

(a) Replace the power window regulator master switch assembly (See page ).

6.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page OK: ).

OK:

DTC B2312 is not output.

END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / P-Door Motor / Data List.

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

P-Door Motor (Front Power Window Regulator Motor Assembly RH)

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
P Door P/W Auto SW	Front passenger side power window auto up/down switch signal / ON or OFF	ON: Front passenger side power window auto switch operated OFF: Front passenger side power window auto switch not operated	-
P Door P/W Up SW	Front passenger side power window manual up switch signal / ON or OFF	ON: Front passenger side power window manual up switch operated OFF: Front passenger side power window manual up switch not operated	-
P Door P/W Down SW	Front passenger side power window manual down switch signal / ON or OFF	ON: Front passenger side power window manual down switch operated OFF: Front passenger side power window manual down switch not operated	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

P Door P/W Auto SW

Front passenger side power window auto up/down switch signal / ON or OFF

ON: Front passenger side power window auto switch operated

OFF: Front passenger side power window auto switch not operated

P Door P/W Up SW

Front passenger side power window manual up switch signal / ON or OFF

ON: Front passenger side power window manual up switch operated

OFF: Front passenger side power window manual up switch not operated

P Door P/W Down SW

Front passenger side power window manual down switch signal / ON or OFF

ON: Front passenger side power window manual down switch operated

OFF: Front passenger side power window manual down switch not operated

OK:

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

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

8.	INSPECT FRONT POWER WINDOW REGULATOR SWITCH ASSEMBLY RH

(a) Remove the front power window regulator switch assembly RH (See page (b) Inspect the front power window regulator switch assembly RH. ).

(b) Inspect the front power window regulator switch assembly RH.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
5 - 7	Auto up or manual up position	Below 1 Ω
4 - 7	Auto down or manual down position	Below 1 Ω
7 - 8	Auto down or manual down position	Below 1 Ω
4 - 5	Off	10 kΩ or higher

REPLACE FRONT POWER WINDOW REGULATOR SWITCH ASSEMBLY RH

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

(a) Disconnect the P22 front power window regulator motor assembly RH connector.

(b) Disconnect the P21 front power window regulator switch assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
P21-5 (UP) - Body ground	Always	10 kΩ or higher
P21-4 (DOWN) - Body ground	Always	10 kΩ or higher
P21-8 (AUTO) - Body ground	Always	10 kΩ or higher
P22-10 (UP) - Body ground	Always	10 kΩ or higher
P22-7 (DOWN) - Body ground	Always	10 kΩ or higher
P22-4 (AUTO) - Body ground	Always	10 kΩ or higher

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

REPAIR OR REPLACE HARNESS OR CONNECTOR

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