NETWORKING  LIN COMMUNICATION SYSTEM  B2325  LIN Communication Bus Malfunction  


DESCRIPTION

The main body ECU (multiplex network body ECU) monitors communication between all the ECUs connected to the door bus lines. When the main body ECU (multiplex network body ECU) detects errors in communication with all the ECUs connected to the door bus lines at 2.6-second intervals and 3 times in a row, DTC B2325 will be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2325 LIN Communication Bus Malfunction Main body ECU (multiplex network body ECU) detects errors in communication with the ECUs connected to the door bus lines 3 times in a row.
·

Power window regulator motor assembly (for driver door)*1

·

Sliding roof ECU (sliding roof drive gear sub-assembly)*2

·

Main body ECU (multiplex network body ECU)

·

Instrument panel junction block assembly

·

Wire harness or connector

·

DOOR NO. 2 fuse*1

·

S/ROOF fuse*2



*1: w/ Power Window System

*2: w/ Sliding Roof System


WIRING DIAGRAM

B352025E33
2.208,0.531 3.052,0.76 0.844,0.229 10 false from Battery 1.198,2.49 3.094,2.958 1.896,0.469 10 false Sliding Roof ECU (Sliding Roof Drive Gear Sub-assembly)*2 0.625,1.875 1.385,2.094 0.76,0.219 10 false S/ROOF*2 1.604,2.115 1.833,2.333 0.229,0.219 10 false E 1.604,1.75 1.792,1.969 0.188,0.219 10 false B 1.396,1.625 1.646,1.833 0.25,0.208 10 false 8 1.208,2.313 2.01,2.521 0.802,0.208 10 false O16 6.01,1.885 7.042,2.135 1.031,0.25 10 false DOOR NO. 2*1 4.323,2.594 6.281,3.115 1.958,0.521 10 false Power Window Regulator Motor Assembly (for Driver Door)*1 2.333,1.917 2.802,2.125 0.469,0.208 10 false MPX1 5.427,2.115 5.844,2.313 0.417,0.198 10 false GND 4.594,1.927 4.906,2.125 0.313,0.198 10 false LIN 2.781,1.75 3.104,1.927 0.323,0.177 10 false 11 1.292,4.5 1.656,4.698 0.365,0.198 10 false LIN2 1.688,4.479 2.021,4.656 0.333,0.177 10 false MB 2.927,4.917 3.24,5.115 0.313,0.198 10 false 3C 2.938,4.479 3.219,4.667 0.281,0.188 10 false 3C 5.594,1.74 5.833,1.938 0.24,0.198 10 false B 1.698,4.302 1.917,4.469 0.219,0.167 10 false 16 4.375,1.729 4.583,1.927 0.208,0.198 10 false 9 2.927,4.729 3.26,4.958 0.333,0.229 10 false 44 2.927,4.292 3.188,4.552 0.26,0.26 10 false 23 0.115,5.469 1.833,5.896 1.719,0.427 10 false Main Body ECU (Multiplex Network Body ECU) 1.917,5.333 3.552,5.76 1.635,0.427 10 false Instrument Panel Junction Block Assembly 4.448,6.115 6.052,6.438 1.604,0.323 10 false : LIN Communication Line 4.729,5.406 6.698,5.708 1.969,0.302 10 false *2: w/ Sliding Roof System 5.792,1.979 6,2.177 0.208,0.198 10 false 1 5.792,1.594 6,1.792 0.208,0.198 10 false 2 4.313,2.427 4.823,2.615 0.51,0.188 10 false G12 1.333,1.99 1.615,2.219 0.281,0.229 10 false 12 4.729,5.031 6.833,5.417 2.104,0.385 10 false *1: w/ Power Window System

CAUTION / NOTICE / HINT

NOTICE:
·

Inspect the fuses for circuits related to this system before performing the following procedure.

·

When a power window regulator motor assembly (for driver door) is replaced or removed and reinstalled, it requires initialization.

Click hereVehicle Exterior>WINDOW / GLASS>POWER WINDOW CONTROL SYSTEM>INITIALIZATION

·

Before performing the inspection, check that DTC B1273 or B2321 is not output.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR



PROCEDURE

1.CONFIRM MODEL
a.

Choose the model to be inspected.


Result:
Result Proceed to
for Models with Power Window System and Sliding Roof System A
for Models with Power Window System and without Sliding Roof System. B
for Models without Power Window System and Sliding Roof System C



A

2.CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

B

6.CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

C

9.CHECK FOR DTC
2.CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
a.

Remove the instrument panel junction block assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL

B330524C13
1.875,0.927 2.333,1.167 0.458,0.24 5.375,0.75 5.833,0.99 0.458,0.24 1.75,2.167 2.031,2.167 2.031,2.167 2.031,1.75 false 0.438,0.26 0.75,0.458 0.313,0.198 10 *a 5.521,0.792 5.833,0.99 0.313,0.198 10 3C 2.01,0.969 2.323,1.167 0.313,0.198 10 MB 1.438,2.083 1.75,2.281 0.313,0.198 10 LIN2
*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
3C-44 - MB-16 (LIN2) Always Below 1 Ω
3C-23 - MB-16 (LIN2) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


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

Disconnect the 3C instrument panel junction block assembly connector.


b.

Disconnect the G12 power window regulator motor assembly (for driver door) connector.


c.

Disconnect the O16 sliding roof ECU (sliding roof drive gear sub-assembly) connector.


d.

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 Condition Specified Condition
3C-44 - G12-9 (LIN) Ignition switch off Below 1 Ω
3C-23 - O16-11 (MPX1) Ignition switch off Below 1 Ω
3C-44 or G12-9 (LIN) - Body ground Ignition switch off 10 kΩ or higher
3C-23 or O16-11 (MPX1) - Body ground Ignition switch off 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the G12 power window regulator motor assembly (for driver door) connector.


b.

Clear the DTCs.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Clear DTCs
50002 123

c.

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

Body Electrical > Main Body > Trouble Codes
50001 123

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



A

5.CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door)

Click hereVehicle Exterior>WINDOW / GLASS>POWER WINDOW REGULATOR MOTOR(for Front Door)>REMOVAL


5.CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)
a.

Disconnect the O16 sliding roof ECU (sliding roof drive gear sub-assembly) connector.


b.

Clear the DTCs.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Clear DTCs
50002 123

c.

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

Body Electrical > Main Body > Trouble Codes
50001 123

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



A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


B

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

Click hereVehicle Exterior>SLIDING ROOF / CONVERTIBLE>SLIDING ROOF HOUSING>REMOVAL


6.CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
a.

Remove the instrument panel junction block assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL

B330524C13
1.875,0.927 2.333,1.167 0.458,0.24 5.375,0.75 5.833,0.99 0.458,0.24 1.75,2.167 2.031,2.167 2.031,2.167 2.031,1.75 false 0.438,0.26 0.75,0.458 0.313,0.198 10 *a 5.521,0.792 5.833,0.99 0.313,0.198 10 3C 2.01,0.969 2.323,1.167 0.313,0.198 10 MB 1.438,2.083 1.75,2.281 0.313,0.198 10 LIN2
*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
3C-44 - MB-16 (LIN2) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door))

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


7.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door))
a.

Disconnect the G12 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 Condition Specified Condition
3C-44 - G12-9 (LIN) Ignition switch off Below 1 Ω
3C-44 or G12-9 (LIN) - Body ground Ignition switch off 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the G12 power window regulator motor assembly (for driver door) connector.


b.

Clear the DTCs.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Clear DTCs
50002 123

c.

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

Body Electrical > Main Body > Trouble Codes
50001 123

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



A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door)

Click hereVehicle Exterior>WINDOW / GLASS>POWER WINDOW REGULATOR MOTOR(for Front Door)>REMOVAL


9.CHECK FOR DTC
a.

Check for DTCs.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Trouble Codes
50001 123
OK:

DTC B2325 is not output.



Result:
Proceed to
OK
NG



OK

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL