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

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 or Door Key Cylinder

DESCRIPTION

The main body ECU (multiplex network body ECU) receives switch signals from the power window regulator master switch assembly and driver door key cylinder lock or unlock switch signals from the front door lock assembly. The main body ECU (multiplex network body ECU) activates the door lock motor on each door according to these signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The power door lock control system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power door lock control system after confirming that the communication systems are functioning properly.*1

*1: w/ Jam Protection

PROCEDURE

1.	CHECK DOOR LOCK OPERATION

(a) Check door lock operation (See page Result ).

Result

Result	Proceed to
All doors cannot be locked by power window regulator master switch assembly. (w/ Jam Protection)	A
All doors cannot be locked by power window regulator master switch assembly. (w/o Jam Protection)	B
All doors cannot be locked by driver door key cylinder	C

GO TO STEP 8

GO TO STEP 5

2.	CHECK FOR DTC (LIN COMMUNICATION SYSTEM)

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

(b) Recheck for DTCs.

OK:

DTC B1206 is not output.

GO TO LIN COMMUNICATION SYSTEM (DTC B1206)

3.	REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

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

4.	CHECK DOOR LOCK OPERATION

(a) Check that all doors can be locked and unlocked by the power window regulator master switch assembly (See page OK: ).

OK:

All doors can be locked and unlocked by the power window regulator master switch assembly.

END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

5.	READ VALUE USING TECHSTREAM (Door Key SW-Lock, D Door Key SW-UL)

(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 Key SW-Lock	Driver door key-linked lock/unlock switch lock signal/ON or OFF	ON: Driver door key cylinder turned to lock position OFF: Driver door key cylinder not turned to lock position	-
D Door Key SW-UL	Driver door key-linked lock/unlock switch unlock signal/ON or OFF	ON: Driver door key cylinder turned to unlock position OFF: Driver door key cylinder not turned to unlock position	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Door Key SW-Lock

Driver door key-linked lock/unlock switch lock signal/ON or OFF

ON: Driver door key cylinder turned to lock position

OFF: Driver door key cylinder not turned to lock position

D Door Key SW-UL

Driver door key-linked lock/unlock switch unlock signal/ON or OFF

ON: Driver door key cylinder turned to unlock position

OFF: Driver door key cylinder not turned to unlock position

OK:

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

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

6.	INSPECT FRONT DOOR LOCK ASSEMBLY LH

(a) Remove the front door lock assembly LH (See page (b) Inspect the front door lock assembly LH. ).

(b) Inspect the front door lock assembly LH.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
9 (L) - 7 (GND)	Always	10 kΩ or higher
9 (L) - 7 (GND)	Lock switch pushed	Below 1 Ω
10 (UL) - 7 (GND)	Always	10 kΩ or higher
10 (UL) - 7 (GND)	Unlock switch pushed	Below 1 Ω

Text in Illustration

*a	Unlock
*b	Neutral
*c	Lock
*d	Component without harness connected (Front Door Lock Assembly LH)

REPLACE FRONT DOOR LOCK ASSEMBLY LH

7.	CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the M6 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D19-9 (L) - M6-29 (L2)	Always	Below 1 Ω
D19-10 (UL) - M6-2 (UL3)	Always	Below 1 Ω
D19-7 (E) - Body ground	Always	Below 1 Ω
M6-29 (L2) - Body ground	Always	10 kΩ or higher
M6-2 (UL3) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	READ VALUE USING TECHSTREAM (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY)

(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)

9.	INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

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

(b) Inspect the power window regulator master switch assembly.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
2 (L) - 1 (GND)	Always	10 kΩ or higher
2 (L) - 1 (GND)	Lock switch pushed	Below 1 Ω
8 (UL) - 1 (GND)	Always	10 kΩ or higher
8 (UL) - 1 (GND)	Unlock switch pushed	Below 1 Ω

Text in Illustration

*a	Component without harness connected (Power Window Regulator Master Switch Assembly)

REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

10.	CHECK HARNESS AND CONNECTOR (POWER WINDOW MASTER SWITCH - 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
1D-16 (UL1) - P18-8 (UL)	Always	Below 1 Ω
1D-23 (L1) - P18-2 (L)	Always	Below 1 Ω
P18-1 (GND) - Body ground	Always	Below 1 Ω
1D-16 (UL1) or P18-8 (UL) - Body ground	Always	10 kΩ or higher
1D-23 (L1) or P18-2 (L) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	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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TERMINALS OF ECU 1. CHECK DRIVER SIDE JUNCTION BLOCK AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Disconnect the MB main body ECU (multiplex network body ECU) connectors. (b) Measure the ...

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