Toyota Venza: Back Door Entry Lock and Unlock Functions do not Operate

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

DESCRIPTION

When the back door entry lock and unlock functions do not operate, one of the following may be malfunctioning: 1) power door lock control system; 2) outside electrical key oscillator (for rear side); 3) certification ECU (smart key ECU assembly), or 4) back door opener switch assembly.

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.	CHECK POWER DOOR LOCK OPERATION

(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)

2.	READ VALUE USING TECHSTREAM

(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/Display	Normal Condition	Diagnostic Note
Tr/B-Door Lock SW	Back door opener switch assembly (lock switch) / ON or OFF	ON: Back door opener switch assembly (lock switch) pushed OFF: Back door opener switch assembly (lock switch) not pushed	-
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/Display

Normal Condition

Diagnostic Note

Tr/B-Door Lock SW

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

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

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

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.

GO TO STEP 7

3.	CHECK WAVE ENVIRONMENT

(a) Bring the key near the outside electrical key oscillator (for rear side), and perform an entry back door open and entry lock functions check.

NOTICE:

If the key is brought within 0.2 m (0.656 ft.) of the rear bumper, communication is not possible.

HINT:

When the key is brought near the outside electrical key oscillator (for rear side), the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
If the operation is normal, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation.

OK:

Entry functions operate normally.

AFFECTED BY WAVE INTERFERENCE

4.	PERFORM KEY DIAGNOSTIC MODE INSPECTION

(a) Diagnostic mode inspection (outside electrical key oscillator (for rear side))

(1) Connect the Techstream to the DLC3.

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

(3) Turn the Techstream on.

(4) Enter the following menus: Body Electrical / Smart Key / Key Communication Check / Overhead + Back Door.

(5) When the key is held at the same height as the rear bumper upper surface and aligned with the center of the rear of the vehicle, check that the wireless door lock buzzer sounds.

HINT:

If the buzzer sounds, it can be determined that the outside electrical key oscillator (for rear side) is operating normally.

OK:

Wireless door lock buzzer sounds.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

5.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - OUTSIDE ELECTRICAL KEY OSCILLATOR)

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

(b) Disconnect the outside electrical key oscillator (for rear side) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D26-19 (CLG8) - L17-1 (CLG5)	Always	Below 1 Ω
D26-20 (CG8B) - L17-2 (CLGB)	Always	Below 1 Ω
D26-19 (CLG8) - Body ground	Always	10 kΩ or higher
D26-20 (CG8B) - Body ground	Always	10 kΩ or higher
L17-1 (CLG5) - Body ground	Always	10 kΩ or higher
L17-2 (CLGB) - 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 Outside Electrical Key Oscillator (for Rear Side))

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT OUTSIDE ELECTRICAL KEY OSCILLATOR (for Rear Side)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
L17-1 (CLG5) - L17-2 (CLGB)	Always	Below 1 Ω

Text in Illustration

*1	Component without harness connected (Outside Electrical Key Oscillator (for Rear Side))

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE OUTSIDE ELECTRICAL KEY OSCILLATOR (for Rear Side)

7.	CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH - BODY GROUND)

(a) Disconnect the back door opener switch assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R13-2 (E) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Back Door Opener Switch Assembly))

REPLACE BACK DOOR OPENER SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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 ba ...

Back Door Entry Lock Function does not Operate

DESCRIPTION If the back door entry lock function does not operate but the back door open function operates, the communication between the vehicle and key is normal. As a faulty part, the entry lo ...

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