Toyota 4Runner: Back Door Entry Lock Function does not Operate

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System(for Entry Function) / Back Door Entry Lock Function does not Operate

DESCRIPTION

If the back door entry lock function does not operate but the back door unlock function operates, the communication line between the vehicle and electrical key transmitter is normal. The entry lock switch circuit (back door control switch → certification ECU) may be faulty.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The smart key system (for Entry Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting (See page ). Troubleshoot the smart key
system (for Entry Function) after confirming that the communication systems are functioning properly.
When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
Check that there are no electrical key transmitters in the vehicle.
When checking the entry lock operation multiple times, the lock operation may be limited to 2 consecutive operations depending on the settings. In order to perform the entry lock operation 3 or more times, an unlock operation must be performed once (any type of unlock operation is sufficient). However, only consecutive entry lock operations are limited. Using the wireless lock or other types of lock operations, it is possible to perform consecutive lock operations without this limitation.
Before replacing the certification ECU, refer to the engine immobiliser system (w/ Smart Key System) (See page
).

PROCEDURE

1.	CHECK POWER DOOR LOCK OPERATION

(a) When the door control switch on the multiplex network master switch assembly is operated, check that the doors unlock and lock according to the switch operation (See page ).

OK:

Door locks operate normally.

GO TO POWER DOOR LOCK CONTROL SYSTEM

2.	READ VALUE USING TECHSTREAM (LOCK SWITCH)

(a) Using the Techstream, read the Data List (See page ).

Smart Key

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Tr/B-Door Lock SW	Back door lock switch / ON or OFF	ON: Back door lock switch pushed OFF: Back door lock switch not pushed	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Tr/B-Door Lock SW

Back door lock switch / ON or OFF

ON: Back door lock switch pushed

OFF: Back door lock switch not pushed

OK:

"ON" (lock switch is pushed) and "OFF" (lock switch is not pushed) appear on the screen.

REPLACE CERTIFICATION ECU

3.	INSPECT BACK DOOR CONTROL SWITCH (LOCK SWITCH)

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

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
1 (SUP) - 2 (E3)	No switch pushed	10 kΩ or higher
1 (SUP) - 2 (E3)	Lock switch pushed	Below 1 Ω

REPLACE BACK DOOR CONTROL SWITCH

4.	CHECK HARNESS AND CONNECTOR (BACK DOOR CONTROL SWITCH - CERTIFICATION ECU)

(a) Disconnect the W11 switch connector.

(b) Disconnect the F79 ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W11-1 (SUP) - F79-23 (TSW6)	Always	Below 1 Ω
W11-2 (E3) - Body ground	Always	Below 1 Ω
W11-1 (SUP) - Body ground	Always	10 kΩ or higher

REPLACE CERTIFICATION ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

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