Toyota Venza: Back Door cannot be Opened

Toyota Venza Service Manual / Door / Hatch / Back Door Closer System / Back Door cannot be Opened

DESCRIPTION

When the back door cannot be opened, one of the following may be malfunctioning: 1) power back door ECU (power back door motor unit)*1 or back door closer ECU (multiplex network door ECU)*2, 2) back door lock assembly, 3) back door opener switch assembly, or 4) main body ECU (driver side junction block assembly).

*1: w/ Power Back Door System
*2: w/o Power Back Door System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The back door closer system uses CAN communication. First, follow "How to Proceed with Troubleshooting" and at step "Check Communication Function of CAN Communication System", confirm that there is no malfunction in the CAN communication system. After confirming that B2250 or B2251 is not output, proceed with troubleshooting.

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(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) Check if the back door lock functions properly.

Main Body (Main Body ECU (Driver Side Junction Block Assembly))

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Back Door Open	Back door lock / Permit or Prohibit	Permit: Back door unlocked Prohibit: Back door locked	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Back Door Open

Back door lock / Permit or Prohibit

Permit: Back door unlocked

Prohibit: Back door locked

OK:

The back door functions as specified in the normal condition column.

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

2.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Back Door / Data List.

(e) Check if the back door lock functions properly.

Back Door (Power Back Door ECU*1 or Back Door Closer ECU*2)

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Door Lock Status	Back door lock condition signal / LOCK or UNLOCK	LOCK: Back door locked UNLOCK: Back door unlocked	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Door Lock Status

Back door lock condition signal / LOCK or UNLOCK

LOCK: Back door locked

UNLOCK: Back door unlocked

*1: w/ Power Back Door System
*2: w/o Power Back Door System

OK:

The back door functions as specified in the normal condition column.

Result	Proceed to
OK	A
NG (w/ Power Back Door ECU)	B
NG (w/o Power Back Door ECU)	C

REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT)

REPLACE BACK DOOR CLOSER ECU (MULTIPLEX NETWORK DOOR ECU)

3.	READ VALUE USING TECHSTREAM

(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) Check if the switch functions properly.

Main Body (Main Body ECU (Driver Side Junction Block Assembly))

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Back Door Open Handle SW	Back door opener switch / ON or OFF	ON: Back door opener switch pushed OFF: Back door opener switch not pushed	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Back Door Open Handle SW

Back door opener switch / ON or OFF

ON: Back door opener switch pushed

OFF: Back door opener switch not pushed

OK:

The back door opener switch functions as specified in the normal condition column.

GO TO STEP 6

4.	INSPECT BACK DOOR LOCK ASSEMBLY

(a) Remove the back door lock assembly (See page ).

(b) Apply battery voltage and check the operation of the door lock motor.

OK:

Measurement Condition	Specified Condition
Battery positive (+) → Terminal 1 (M+) Battery negative (-) → Terminal 2 (M-)	Latch turns to full-latch position
Battery positive (+) → Terminal 2 (M-) Battery negative (-) → Terminal 1 (M+)	Latch turns to open-latch position

Measurement Condition

Specified Condition

Battery positive (+) → Terminal 1 (M+)

Battery negative (-) → Terminal 2 (M-)

Latch turns to full-latch position

Battery positive (+) → Terminal 2 (M-)

Battery negative (-) → Terminal 1 (M+)

Latch turns to open-latch position

Standard Resistance:

Latch Switch

Tester Connection	Condition	Specified Condition
5 (ULSW) - 4 (E)	Open-latch	Below 1 Ω
5 (ULSW) - 4 (E)	Half-latch	10 kΩ or higher
5 (ULSW) - 4 (E)	Full-latch	10 kΩ or higher
5 (ULSW) - 4 (E)	Over-latch	Below 1 Ω

Sector Switch

Tester Connection	Condition	Specified Condition
6 (DLSW) - 4 (E)	Sector gear in neutral position (Sector switch on)	Below 1 Ω
6 (DLSW) - 4 (E)	Sector gear not in neutral position (Sector switch off)	10 kΩ or higher

Back Door Courtesy Switch

Tester Connection	Condition	Specified Condition
3 (CTY) - 4 (E)	Open-latch	Below 1 Ω
3 (CTY) - 4 (E)	Half-latch	Below 1 Ω
3 (CTY) - 4 (E)	Full-latch	10 kΩ or higher
3 (CTY) - 4 (E)	Over-latch	10 kΩ or higher

REPLACE BACK DOOR LOCK ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - POWER BACK DOOR ECU OR BACK DOOR CLOSER ECU)

(a) w/ Power Back Door System

(1) Disconnect the R1 back door lock assembly connector and L20 power back door ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R1-1 (M+) - L20-2 (DC+)	Always	Below 1 Ω
R1-2 (M-) - L20-1 (DC-)	Always	Below 1 Ω
R1-5 (ULSW) - L20-22 (HAF)	Always	Below 1 Ω
R1-6 (DLSW) - L20-24 (POS)	Always	Below 1 Ω
R1-3 (CTY) - L20-20 (FUL)	Always	Below 1 Ω
R1-4 (E) - Body ground	Always	Below 1 Ω
R1-1 (M+) - Body ground	Always	10 kΩ or higher
R1-2 (M-) - Body ground	Always	10 kΩ or higher
R1-5 (ULSW) - Body ground	Always	10 kΩ or higher
R1-6 (DLSW) - Body ground	Always	10 kΩ or higher
R1-3 (CTY) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Back Door Lock)

Front view of wire harness connector

(to Power Back Door ECU)

(b) w/o Power Back Door System

(1) Disconnect the R1 back door lock assembly connector and L21 back door closer ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R1-1 (M+) - L21-2 (DC+)	Always	Below 1 Ω
R1-2 (M-) - L21-1 (DC-)	Always	Below 1 Ω
R1-3 (CTY) - L21-6 (FUL)	Always	Below 1 Ω
R1-5 (ULSW) - L21-5 (HAF)	Always	Below 1 Ω
R1-6 (DLSW) - L21-7 (POS)	Always	Below 1 Ω
R1-4 (E) - Body ground	Always	Below 1 Ω
R1-1 (M+) - Body ground	Always	10 kΩ or higher
R1-2 (M-) - Body ground	Always	10 kΩ or higher
R1-3 (CTY) - Body ground	Always	10 kΩ or higher
R1-5 (ULSW) - Body ground	Always	10 kΩ or higher
R1-6 (DLSW) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Back Door Lock)

Front view of wire harness connector

(to Back Door Closer ECU)

Result	Proceed to
NG	A
OK (w/ Power Back Door System)	B
OK (w/o Power Back Door System)	C

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT)

REPLACE BACK DOOR CLOSER ECU (MULTIPLEX NETWORK DOOR ECU)

6.	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	Condition	Specified Condition
2 (E) - 3 (UL)	Back door opener switch not pushed (off)	10 kΩ or higher
2 (E) - 3 (UL)	Back door opener switch pushed (on)	Below 1 Ω

REPLACE BACK DOOR OPENER SWITCH ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - MAIN BODY ECU)

(a) Disconnect the R13 back door opener switch assembly connector and D49 main body ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R13-3 (UL) - D49-2 (BDSU)	Always	Below 1 Ω
R13-2 (E) - Body ground	Always	Below 1 Ω
R13-3 (UL) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Back Door Opener Switch Assembly)

Front view of wire harness connector

(to Main Body ECU)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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