Toyota Tacoma (2015-2018) Service Manual: Driver Side Power Window does not Operate with Power Window Master Switch

DESCRIPTION

When the engine is running or the ignition switch is ON, the front power window regulator motor assembly LH is operated by the power window regulator master switch assembly. The front power window regulator motor assembly LH has motor, regulator, and ECU functions.

HINT:

If the pulse sensor built into the front power window regulator motor assembly LH malfunctions, the power window control system enters fail-safe mode. The remote up/down and auto up/down functions cannot be operated during fail-safe mode. However, the power window can be closed by holding the power window regulator master switch assembly at the auto up position, and opened manually by pushing down the power window regulator master switch assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	READ VALUE USING TECHSTREAM (MAIN BODY)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(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.

Main Body (Main Body ECU)

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 / OK or STOP	OK: Normal communication STOP: Communication stopped	-
Communication Master SW	Connection status between multiplex network master switch and main body ECU / OK or STOP	OK: Normal communication STOP: Communication stopped	-

OK:

On the Techstream screen, OK is displayed.

NG

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

OK

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

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

(b) 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	-

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) Enter the following menus: Body Electrical / D-Door Motor / Active Test.

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

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.

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

Tester Display	Test Part	Control Range	Diagnostic Note
Power Window	Power window	OFF / UP / DOWN	-

HINT:

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

OK:

Driver side power window operates normally.

OK

REPLACE MAIN 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) 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) - P24-10 (UP)	Always	Below 1 Ω
P18-5 (DOWN) - P24-7 (DOWN)	Always	Below 1 Ω
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) - P24-10 (UP)	Always	Below 1 Ω
P23-15 (DOWN) - P24-7 (DOWN)	Always	Below 1 Ω
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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.	REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

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

NEXT

6.	CHECK MANUAL UP / DOWN FUNCTION (FOR DRIVER SIDE)

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

OK:

Driver side manual up/down function is normal.

OK

END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

NG

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH