Toyota CH-R Service Manual: LIN Communication Bus Malfunction (B2325)

DESCRIPTION

If the main body ECU (multiplex network body ECU) detects a communication error with an ECU connected to the door bus lines for 7 seconds or more, DTC B2325 will be stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2325	LIN Communication Bus Malfunction	The main body ECU (multiplex network body ECU) detects a communication error with an ECU connected to the door bus lines for 7 seconds or more.	Power window regulator motor assembly (for driver door) Power window regulator motor assembly (for front passenger door) Power window regulator motor assembly (for rear RH door) Power window regulator motor assembly (for rear LH door) Multiplex network master switch assembly Double lock door control relay assembly*1 Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector ECU-B NO. 2 fuse POWER fuse DOOR fuse DOOR R/L fuse DOOR R/R fuse DOOR DBL/L fuse*1 ECU-DCC NO. 2 fuse*1

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

*a

Component without harness connected (Instrument Panel Junction Block Assembly)

-

-

(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

HINT:

This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

Standard Resistance:

Tester Connection	Condition	Specified Condition
3H-25 - MB-16 (LIN2)	Always	Below 1 Ω
3D-17 - MB-16 (LIN2)	Always	Below 1 Ω

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

OK

2.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - EACH ECU)

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

(b) Disconnect the I2 power window regulator motor assembly (for front passenger door) connector.

(c) Disconnect the L2 power window regulator motor assembly (for rear LH door) connector.

(d) Disconnect the K2 power window regulator motor assembly (for rear RH door) connector.

(e) Disconnect the J6 multiplex network master switch assembly connector.

(f) Disconnect the F14 double lock door control relay assembly connector.*1

(g) 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
3H-25 - J6-17 (LIN1)	Ignition switch off	Below 1 Ω
3D-17 - F14-9 (LIN)*1	Ignition switch off	Below 1 Ω
3H-25 - I2-9 (LIN)	Ignition switch off	Below 1 Ω
3H-25 - L2-9 (LIN)	Ignition switch off	Below 1 Ω
3H-25 - K2-9 (LIN)	Ignition switch off	Below 1 Ω
3H-25 - J2-9 (LIN)	Ignition switch off	Below 1 Ω
J6-17 (LIN1) - Body ground	Ignition switch off	10 kΩ or higher
F14-9 (LIN) - Body ground*1	Ignition switch off	10 kΩ or higher
3H-25 or 3D-17 - Body ground	Ignition switch off	10 kΩ or higher
I2-9 (LIN) - Body ground	Ignition switch off	10 kΩ or higher
L2-9 (LIN) - Body ground	Ignition switch off	10 kΩ or higher
K2-9 (LIN) - Body ground	Ignition switch off	10 kΩ or higher
J2-9 (LIN) - Body ground	Ignition switch off	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Rear LH Dooor)

(a) Reconnect the 3D and 3H instrument panel junction block assembly connectors.

(b) Reconnect the J2 power window regulator motor assembly (for driver door) connector.

(c) Reconnect the I2 power window regulator motor assembly (for front passenger door) connector.

(d) Reconnect the K2 power window regulator motor assembly (for rear RH door) connector.

(e) Reconnect the J6 multiplex network master switch assembly connector.

(f) Reconnect the F14 double lock door control relay assembly connector.*1

(g) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(h) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTC B2325 is output	A
DTC B2325 is not output	B

B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Rear LH Door)

A

4.	CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Reconnect the L2 power window regulator motor assembly (for rear LH door) connector.

(b) Disconnect the J6 multiplex network master switch assembly connector.

(c) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(d) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTC B2325 is output	A
DTC B2325 is not output	B

B

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

A

5.	CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Rear RH Door)

(a) Reconnect the J6 multiplex network master switch assembly connector.

(b) Disconnect the K2 power window regulator motor assembly (for rear RH door) connector.

(c) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(d) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTC B2325 is output	A
DTC B2325 is not output	B

B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Rear RH Door)

A

6.	CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door)

(a) Reconnect the K2 power window regulator motor assembly (for rear RH door) connector.

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

(c) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(d) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTC B2325 is output	A
DTC B2325 is not output	B

B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door)

A

7.	CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Front Passenger Door)

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

(b) Disconnect the I2 power window regulator motor assembly (for front passenger door) connector.

(c) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(d) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTC B2325 is output (w/ Double Locking System)	A
DTC B2325 is output (w/o Double Locking System)	B
DTC B2325 is not output	C

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

C

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Front Passenger Door)

A

8.	CHECK DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY

(a) Reconnect each ECU connectors.

(b) Disconnect the F14 double lock door control relay assembly connector.

(c) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(d) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTC B2325 is output	A
DTC B2325 is not output	B

A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

B

REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY