Toyota Tacoma (2015-2018) Service Manual: All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch

Toyota Tacoma (2015-2018) Service Manual / Door Lock / Power Door Lock Control System / All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch

DESCRIPTION

The main body ECU (multiplex network body ECU) receives switch signals from the door control switch assembly on the front passenger door and activates the door lock motor on each door according to these signals.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM (Door Lock SW-Lock, Door Lock SW-Unlock)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to 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

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Door Lock SW-Lock	Door control switch (power window regulator master switch assembly) or door control switch assembly lock signal/ON or OFF	ON: Lock side of door control switch (power window regulator master switch assembly) or door control switch assembly pushed OFF: Lock side of door control switch (power window regulator master switch assembly) and door control switch assembly not pushed	-
Door Lock SW-Unlock	Door control switch (power window regulator master switch assembly) or door control switch assembly unlock signal/ON or OFF	ON: Unlock side of door control switch (power window regulator master switch assembly) or door control switch assembly pushed OFF: Unlock side of door control switch (power window regulator master switch assembly) or door control switch assembly not pushed	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Door Lock SW-Lock

Door control switch (power window regulator master switch assembly) or door control switch assembly lock signal/ON or OFF

ON: Lock side of door control switch (power window regulator master switch assembly) or door control switch assembly pushed

OFF: Lock side of door control switch (power window regulator master switch assembly) and door control switch assembly not pushed

Door Lock SW-Unlock

Door control switch (power window regulator master switch assembly) or door control switch assembly unlock signal/ON or OFF

ON: Unlock side of door control switch (power window regulator master switch assembly) or door control switch assembly pushed

OFF: Unlock side of door control switch (power window regulator master switch assembly) or door control switch assembly not pushed

OK:

The Techstream indicates ON or OFF according to the switch operation shown in the table.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

2.	INSPECT DOOR CONTROL SWITCH ASSEMBLY

(a) Remove the door control switch assembly (See page (b) Inspect the door control switch assembly. ).

(b) Inspect the door control switch assembly.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
2 (UL) - 5 (E)	Lock side of door control switch pushed	Below 1 Ω
2 (UL) - 5 (E)	Lock side of door control switch pushed	10 kΩ or higher
4 (L) - 5 (E)	Lock side of door control switch pushed	Below 1 Ω
4 (L) - 5 (E)	Lock side of door control switch pushed	10 kΩ or higher

Text in Illustration

*a	Component without harness connected (Door Control Switch Assembly)

REPLACE DOOR CONTROL SWITCH ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (DOOR CONTROL SWITCH ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the 1D driver side junction block connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D27-2 (UL) - 1D-26 (UL1)	Always	Below 1 Ω
D27-4 (L) - 1D-10 (L1)	Always	Below 1 Ω
D27-5 (E) - Body ground	Always	Below 1 Ω
D27-2 (UL) - Body ground	Always	10 kΩ or higher
D27-4 (L) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK DRIVER SIDE JUNCTION BLOCK

(a) Remove the driver side junction block (See page ).

Standard Resistance:

Tester Connection	Condition	Specified Condition
1D-16 - MB-22 (UL1)	Always	Below 1 Ω
1D-23 - MB-20 (L1)	Always	Below 1 Ω
1D-16 - Body ground	Always	10 kΩ or higher
1D-23 (L1) - Body ground	Always	10 kΩ or higher

Text in Illustration

Component without harness connected

(driver side junction block)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE DRIVER SIDE JUNCTION BLOCK

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