Toyota CH-R Service Manual: Driver Side Door ECU Communication Stop (B2321)

DESCRIPTION

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2321	Driver Side Door ECU Communication Stop	No communication between power window regulator motor assembly (for driver door) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Power window regulator motor assembly (for driver door) Main body ECU (multiplex network body ECU) Multiplex network master switch assembly Wire harness or connector POWER fuse

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes

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.

B

GO TO DTC B1206

A

2.	INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Remove the multiplex network master switch assembly. Click here

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

(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

NG

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

OK

3.	CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door))

(a) Disconnect the J2 power window regulator motor assembly (for driver door) connector.

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
J6-16 (LIN2) - J2-9 (LIN)	Ignition switch off	Below 1 Ω
J6-16 (LIN2) or J2-9 (LIN) - Body ground	Ignition switch off	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.	CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door) - BATTERY, BODY GROUND)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
J2-2 (B) - J2-1 (GND)	Always	11 to 14 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J2-1 (GND) - Body ground	Always	Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.	REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door)

(a) Replace the power window regulator motor assembly (for driver door).

Click here

NEXT

6.	CHECK DTC OUTPUT

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes

OK:

DTC B2321 is not output.

OK

END (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door) WAS DEFECTIVE)

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)