Toyota Venza: Driver Side Door ECU Communication Stop (B2321)

Toyota Venza Service Manual / Networking / Lin Communication System / Driver Side Door ECU Communication Stop (B2321)

DESCRIPTION

This DTC is stored when LIN communication between the power window regulator motor assembly (for driver side) and main body ECU (driver side junction block assembly) stops for more than 10 seconds.

DTC No.	DTC Detection Condition	Trouble Area
B2321	No communication between the power window regulator motor assembly (for driver side) and main body ECU (driver side junction block assembly) for more than 10 seconds.	Power window regulator motor assembly (for Driver side) Main body ECU (Driver side junction block assembly) Multiplex network master switch assembly Wire harness or connector FL DOOR fuse

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When the power window regulator motor assembly (for driver side) is replaced or removed and reinstalled, it requires initialization (See page ).

When using the Techstream to troubleshoot with the ignition switch off:
Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Clear the DTC (See page ).

(b) Recheck for DTCs.

Result	Proceed to
Only DTC B2321 is output.	A
DTC B1206 and B2321 are output simultaneously.	B

HINT:

When DTC B1206 and B2321 are output simultaneously, perform troubleshooting for DTC B1206 first.

GO TO DTC B1206

2.	CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR - BATTERY AND BODY GROUND)

(a) Disconnect the I4 motor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I4-1 (GND) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Condition	Specified Condition
I4-2 (B) - Body ground	Always	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Power Window Regulator Motor Assembly (for Driver Side))

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (MASTER SWITCH - POWER WINDOW REGULATOR MOTOR ASSEMBLY)

(a) Disconnect the I6 switch connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I6-16 (LIN2) - I4-9 (LIN)	Always	Below 1 Ω
I6-16 (LIN2) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Multiplex Network Master Switch Assembly)

Front view of wire harness connector

(to Power Window Regulator Motor Assembly (for Driver Side))

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Remove the multiplex network master switch assembly (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
16 (LIN2) - 17 (LIN1)	Always	Below 1 Ω

Text in Illustration

*1	Component without harness connected (Multiplex Network Master Switch Assembly)

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

5.	REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER SIDE)

(a) Replace the power window regulator motor assembly (for driver side) (See page ).

6.	CHECK DTC OUTPUT

(a) Clear the DTC (See page ).

(b) Recheck for DTCs.

OK:

DTC B2321 is not output.

END (POWER WINDOW REGULATOR MOTOR ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

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