Toyota 4Runner: All Doors LOCK/UNLOCK Functions do not Operate Via Master Switch, Driver Side Door Key Cylinder

Toyota 4Runner Service Manual / Vehicle Interior / Door Lock / Power Door Lock Control System / All Doors LOCK/UNLOCK Functions do not Operate Via Master Switch, Driver Side Door Key Cylinder

DESCRIPTION

The main body ECU (multiplex network body ECU) receives switch signals from the multiplex network master switch, and key-linked switch signals from the front door lock. 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:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Since the power door lock control system has functions that use LIN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.

PROCEDURE

1.	CHECK DOOR LOCK OPERATION

(a) Check the door lock operation.

Result

Result	Proceed to
No doors can be locked using multiplex network master switch	A
No doors can be locked using door control switch	B
No doors can be locked using key-linked switch	C
No doors can be locked using tail gate control switch*	D

*: w/o Smart Key System

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

GO TO STEP 5

GO TO STEP 8

2.	READ VALUE USING TECHSTREAM (DOOR CONTROL SWITCH)

(a) Use the Data List to check if the door control switch is functioning properly (See page ).

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Door Lock SW-Lock	Door control switch lock signal / ON or OFF	ON: Lock side of door control switch pushed OFF: Lock side of door control switch not pushed	-
Door Lock SW-Unlock	Door control switch unlock signal / ON or OFF	ON: Unlock side of door control switch pushed OFF: Unlock side of door control switch not pushed	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Door Lock SW-Lock

Door control switch lock signal / ON or OFF

ON: Lock side of door control switch pushed

OFF: Lock side of door control switch not pushed

Door Lock SW-Unlock

Door control switch unlock signal / ON or OFF

ON: Unlock side of door control switch pushed

OFF: Unlock side of door control switch not pushed

OK:

On tester screen, each item changes between ON and OFF according to above chart.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

3.	INSPECT DOOR CONTROL SWITCH ASSEMBLY

(a) Remove the door control switch (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4 (L) - 3 (E)	Lock	Below 1 Ω
4 (L) - 3 (E)	Off	10 kΩ or higher
2 (UL) - 3 (E)	Unlock	Below 1 Ω
2 (UL) - 3 (E)	Off	10 kΩ or higher

REPLACE DOOR CONTROL SWITCH ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (DOOR CONTROL SWITCH ASSEMBLY - MAIN BODY ECU)

(a) Disconnect the g2 door control switch connector.

(b) Disconnect the F9 main body ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
g2-2 (UL) - F9-10 (UL1)	Always	Below 1 Ω
g2-4 (L) - F9-9 (L1)	Always	Below 1 Ω
g2-3 (E) - Body ground	Always	Below 1 Ω
g2-2 (UL) - Body ground	Always	10 kΩ or higher
g2-4 (L) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	READ VALUE USING TECHSTREAM (KEY-LINKED SWITCH)

(a) Use the Data List to check if the door key-linked switch is functioning properly (See page ).

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Door Key SW-Lock	Driver side door key-linked switch lock signal / ON or OFF	ON: Driver side door key cylinder turned to lock position OFF: Driver side door key cylinder not turned to lock position	-
D Door Key SW-UL	Driver side door key-linked switch unlock signal / ON or OFF	ON: Driver side door key cylinder turned to unlock position OFF: Driver side door key cylinder not turned to unlock position	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Door Key SW-Lock

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

ON: Driver side door key cylinder turned to lock position

OFF: Driver side door key cylinder not turned to lock position

D Door Key SW-UL

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

ON: Driver side door key cylinder turned to unlock position

OFF: Driver side door key cylinder not turned to unlock position

OK:

On tester screen, each item changes between ON and OFF according to above chart.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

6.	INSPECT FRONT DOOR LOCK ASSEMBLY LH (KEY-LINKED SWITCH)

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

Text in Illustration

Lock

Unlock

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
9 (L) - 7 (E)	Lock	Below 1 Ω
9 (L) - 7 (E)	Off	10 kΩ or higher
10 (UL) - 7 (E)	Unlock	Below 1 Ω
10 (UL) - 7 (E)	Off	10 kΩ or higher

REPLACE FRONT DOOR LOCK ASSEMBLY LH

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

(a) Disconnect the I5 door lock connector.

(b) Remove the main body ECU connector. (See page )

Standard Resistance:

Tester Connection	Condition	Specified Condition
I5-10 (UL) - F9-24 (UL3)	Always	Below 1 Ω
I5-9 (L) - F9-11 (L2)	Always	Below 1 Ω
I5-7 (E) - Body ground	Always	Below 1 Ω
I5-10 (UL) - Body ground	Always	10 kΩ or higher
I5-9 (L) - 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 (TAIL GATE CONTROL SWITCH)

(a) Use the Data List to check if the tail gate control switch and back door are functioning properly (See page ).

Back Door P/W

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Key Switch Operation Locked	Tail gate control switch signal / ON or OFF	ON: Back door key cylinder turned to lock position OFF: Back door key cylinder not turned	-
Key Switch Operation Unlocked	Tail gate control switch signal / ON or OFF	ON: Back door key cylinder turned to unlock position OFF: Back door key cylinder not turned	-
Back Door Courtesy Switch	Back door courtesy switch signal / ON or OFF	ON: Back door open OFF: Back door closed	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Key Switch Operation Locked

Tail gate control switch signal / ON or OFF

ON: Back door key cylinder turned to lock position

OFF: Back door key cylinder not turned

Key Switch Operation Unlocked

Tail gate control switch signal / ON or OFF

ON: Back door key cylinder turned to unlock position

OFF: Back door key cylinder not turned

Back Door Courtesy Switch

Back door courtesy switch signal / ON or OFF

ON: Back door open

OFF: Back door closed

Result	Proceed to
OK	A
NG (Key Switch Operation Locked or Key Switch Operation Unlocked)	B
NG (Back Door Courtesy Switch)	C

REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

GO TO "Only Back Door cannot be Opened"

9.	INSPECT TAIL GATE CONTROL SWITCH ASSEMBLY

(a) Remove the tail gate control switch (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (L) - 3 (E)	Lock position	Below 1 Ω
1 (L) - 3 (E)	Unlock position	10 kΩ or higher
2 (UL) - 3 (E)	Unlock position	Below 1 Ω
2 (UL) - 3 (E)	Lock position	10 kΩ or higher

REPLACE TAIL GATE CONTROL SWITCH ASSEMBLY

10.	CHECK HARNESS AND CONNECTOR (TAIL GATE CONTROL SWITCH ASSEMBLY - MULTIPLEX NETWORK DOOR ECU)

(a) Disconnect the W4 tail gate control switch connector.

(b) Disconnect the W10 multiplex network door ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W4-1 (L) - W10-16 (BKL)	Always	Below 1 Ω
W4-2 (UL) - W10-15 (BKUL)	Always	Below 1 Ω
W4-3 (E) - W10-8 (KEYE)	Always	Below 1 Ω
W4-1 (L) - Body ground	Always	10 kΩ or higher
W4-2 (UL) - Body ground	Always	10 kΩ or higher

REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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