Toyota Venza: Back Door Entry Unlock Function does not Operate

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Entry Function) / Back Door Entry Unlock Function does not Operate

DESCRIPTION

If the entry back door open function does not operate but the back door entry lock function operates, the communication between the vehicle and key is normal. As a faulty part, the back door open switch circuit (from the back door opener switch assembly (opener switch) to the certification ECU (smart key ECU assembly)) is suspected.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The smart key system (for entry function) uses a multiplex communication system (LIN communication system) and 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 system is functioning properly.
Confirm that another key is not in the cabin.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (ENTRY BACK DOOR OPEN FUNCTION)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Smart Key / Data List.

(e) Read the Data List according to the display on the Techstream.

Smart Key (Certification ECU (Smart Key ECU Assembly))

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
B-Dr Opening Operation	Back door opening Operation / Long, Twice, OFF	Customization status displayed	-

Result	Proceed to
Customize setting is LONG or TWICE.	A
Customize setting is OFF.	B

PERFORM CUSTOMIZE SETTING (Proceed to Customize Parameters)

2.	CHECK POWER DOOR LOCK CONTROL SYSTEM

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

OK:

Door locks operate normally.

GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Problem Symptoms Table)

3.	READ VALUE USING TECHSTREAM (BACK DOOR OPENER SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Smart Key / Data List.

(e) Read the Data List according to the display on the Techstream.

Smart Key (Certification ECU (Smart Key ECU Assembly))

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Tr/B-Door Unlock SW	Back door opener switch assembly (opener switch) / ON or OFF	ON: Back door opener switch assembly (opener switch) pushed OFF: Back door opener switch assembly (opener switch) not pushed	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Tr/B-Door Unlock SW

Back door opener switch assembly (opener switch) / ON or OFF

ON: Back door opener switch assembly (opener switch) pushed

OFF: Back door opener switch assembly (opener switch) not pushed

OK:

On the Techstream screen, the display changes between ON and OFF as shown in the chart above.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

4.	INSPECT BACK DOOR OPENER SWITCH ASSEMBLY

(a) Remove the back door opener switch assembly (See page ).

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

Standard Resistance:

Tester Connection	Switch Position	Specified Condition
2 (E) - 3 (UL)	Back door opener switch assembly (opener switch) not pushed (OFF)	10 kΩ or higher
2 (E) - 3 (UL)	Back door opener switch assembly (opener switch) pushed (ON)	Below 1 Ω

Text in Illustration

*1	Component without harness connected (Back Door Opener Switch Assembly)

REPLACE BACK DOOR OPENER SWITCH ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BACK DOOR OPENER SWITCH)

(a) Disconnect the certification ECU (smart key ECU Assembly) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D25-22 (TSW5) - R13-3 (UL)	Always	Below 1 Ω
D25-22 (TSW5) - Body ground	Always	10 kΩ or higher
R13-3 (UL) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Certification ECU (Smart Key ECU Assembly))

Front view of wire harness connector

(to Back Door Opener Switch Assembly)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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