Toyota Tacoma (2015-2018) Service Manual: Driver Side Door ECU Communication Stop (B2321)

Toyota Tacoma (2015-2018) Service Manual / Multiplex Communication / Lin Communication System / Driver Side Door ECU Communication Stop (B2321)

DESCRIPTION

This DTC is stored when LIN communication between the front power window regulator motor assembly LH and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No.	DTC Detection Condition	Trouble Area
B2321	No communication between front power window regulator motor assembly LH and main body ECU (multiplex network body ECU) for 10 seconds or more.	Front power window regulator motor assembly LH Main body ECU (multiplex network body ECU) Power window regulator master switch assembly Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (See page )
When a power window regulator motor assembly is replaced or removed and reinstalled, it requires initialization (See page ).

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page (b) Recheck for DTCs. ).

(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 MASTER SWITCH ASSEMBLY - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH)

(a) for Double Cab

(1) Disconnect the P18 power window regulator master switch assembly connector.

(2) Disconnect the P24 front power window regulator motor assembly LH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
P18-7 (LIN2) - P24-9 (LIN)	Always	Below 1 Ω
P18-7 (LIN2) or P24-9 (LIN) - Body ground	Always	10 kΩ or higher

(b) for Access Cab

(1) Disconnect the P23 power window regulator master switch assembly connector.

(2) Disconnect the P24 front power window regulator motor assembly LH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
P23-16 (LIN2) - P24-9 (LIN)	Always	Below 1 Ω
P23-16 (LIN2) or P24-9 (LIN) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

(a) for Double Cab

(1) Remove the power window regulator master switch assembly.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
6 (LIN1) - 7 (LIN2)	Always	Below 1 Ω

Text in Illustration

*a	Component without harness connected (Power Window Regulator Master Switch Assembly)

(b) for Access Cab

(1) Remove the power window regulator master switch assembly.

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

Standard Resistance:

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

Text in Illustration

*a	Component without harness connected (Power Window Regulator Master Switch Assembly)

REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH - POWER SOURCE CIRCUIT)

(a) Disconnect the P24 front power window regulator motor assembly LH connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
P24-2 (B) - Body ground	Always	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
P24-1 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

(a) Replace the front power window regulator motor assembly LH.

6.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page (b) Check for DTCs. ).

(b) Check for DTCs.

OK:

DTC B2321 is not output.

END (FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH) WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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