Toyota TechDoc

DTC B2325 LIN Communication Bus Malfunction

for Preparation Click here

DESCRIPTION

The main body ECU monitors LIN communication errors in the door bus. The interruption of communication for 2.6 seconds is 1 error, and when 3 consecutive errors are detected (7.8 seconds), then this DTC is stored.

DTC No.	DTC Detection Condition	Trouble Area
B2325	Door bus error detected 3 times consecutively (LIN communication error)	Harness or connector Power window regulator master switch assembly Front door window regulator sub-assembly RH Front door window regulator sub-assembly LH Main body ECU Double lock door control relay assembly*1 Instrument panel junction block assembly

*1: w/ Double Locking Function

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When using the intelligent tester, repeatedly turn either front door courtesy light switch off-and-on at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins.
When the main body ECU has been replaced with a new part, or when the battery negative terminal is reconnected, the ignition switch condition will be ON. Also, after the battery is disconnected and reconnected, the LIN communication system condition is the same as it was before the battery was disconnected.

1.SYSTEM CHECK

Check the vehicle specifications.
Result
Result
Proceed to
for RHD
A
for LHD
B

Result
Result	Proceed to
for RHD	A
for LHD	B

Go to step 10

A

2.CHECK HARNESS AND CONNECTOR (MASTER SWITCH - REGULATOR RH)

Disconnect the E1 power window regulator master switch assembly connector.

Disconnect the E4 front door window regulator sub-assembly RH connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
E1-16 (LIN2) - E4-9 (LIN)
Always
Below 1 Ω
E4-9 (LIN) - Body ground
Always
10 KΩ or higher

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
E4-9 (LIN) - Body ground	Always	Below 0.5 V

Text in Illustration
*1	Front view of wire harness connector (to Power Window Regulator Master Switch Assembly)
*2	Front view of wire harness connector (to Front Door Window Regulator Sub-Assembly RH)

Reconnect the power window regulator master switch assembly connector.

Reconnect the front door window regulator sub-assembly RH connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - EACH ECU)

Disconnect the 3C instrument panel junction block assembly connector.

Disconnect the E1 power window regulator master switch assembly connector.

Disconnect the F4 front door window regulator sub-assembly LH connector.

Disconnect the D40 double lock door control relay assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3C-28 (LIN2) - E1-17 (LIN1)	Always	Below 1 Ω
3C-27 (LIN2) - F4-9 (LIN)	Always	Below 1 Ω
3C-27 (LIN2) - D40-9 (MPX1)	Always	Below 1 Ω
3C-28 (LIN2) - Body ground	Always	10 KΩ or higher
3C-27 (LIN2) - Body ground	Always	10 KΩ or higher

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
3C-28 (LIN2) - Body ground	Always	Below 0.5 V
3C-27 (LIN2) - Body ground	Always	Below 0.5 V

Text in Illustration
*1	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)
*2	Front view of wire harness connector (to Power Window Regulator Master Switch Assembly)
*3	Front view of wire harness connector (to Front Door Window Regulator Sub-Assembly LH)
*4	Front view of wire harness connector (to Double Lock Door Control Relay Assembly)
*5	w/ Double Locking Function

Reconnect the instrument panel junction block assembly connector.

Reconnect the power window regulator master switch assembly connector.

Reconnect the front door window regulator sub-assembly LH connector.

Reconnect the double lock door control relay assembly connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.SYSTEM CHECK

Check the vehicle specifications.
Result
Result
Proceed to
w/ Double Locking Function
A
w/o Double Locking Function
B

Result
Result	Proceed to
w/ Double Locking Function	A
w/o Double Locking Function	B

Go to step 6

A

5.CHECK FOR DTC

Disconnect the D40 double lock door control relay assembly connector.

Connect the 3C instrument panel junction block assembly, E1 power window regulator master switch assembly, E4 front door window regulator sub-assembly RH and F4 front door window regulator sub-assembly LH connectors.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is output
A
DTC B2325 is not output
B

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

Go to step 16

A

6.CHECK FOR DTC

Disconnect the E1 power window regulator master switch assembly connector.

Connect the 3C instrument panel junction block assembly, E4 front door window regulator sub-assembly RH, F4 front door window regulator sub-assembly LH and D40 double lock door control relay assembly connectors.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is output
A
DTC B2325 is not output
B

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

Go to step 18

A

7.CHECK FOR DTC

Disconnect the E4 front door window regulator sub-assembly RH connector.

Connect the 3C instrument panel junction block assembly, E1 power window regulator master switch assembly, F4 front door window regulator sub-assembly LH and D40 double lock door control relay assembly connectors.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is output
A
DTC B2325 is not output
B

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

Go to step 20

A

8.CHECK FOR DTC

Disconnect the F4 front door window regulator sub-assembly LH connector.

Connect the 3C instrument panel junction block assembly, E1 power window regulator master switch assembly, E4 front door window regulator sub-assembly RH and D40 double lock door control relay assembly connectors.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is output
A
DTC B2325 is not output
B

Go to step 22

A

9.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Text in Illustration
*1	Component without harness connected (Instrument Panel Junction Block Assembly)

Remove the instrument panel junction block assembly (Click here).

Remove the main body ECU from the instrument panel junction block assembly (Click here).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3C-27 (LIN2) - 3F-16 (LIN2)	Always	Below 1 Ω
3C-28 (LIN2) - 3F-16 (LIN2)	Always	Below 1 Ω
3C-27 (LIN2) - Body ground	Always	10 KΩ or higher
3C-28 (LIN2) - Body ground	Always	10 KΩ or higher

Reinstall the main body ECU (Click here).

Reinstall the instrument panel junction block assembly (Click here).

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)

REPLACE MAIN BODY ECU (Click here)

10.CHECK HARNESS AND CONNECTOR (MASTER SWITCH - REGULATOR LH)

Disconnect the F1 power window regulator master switch assembly connector.

Disconnect the F4 front door window regulator sub-assembly LH connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
F1-16 (LIN2) - F4-9 (LIN)
Always
Below 1 Ω
F4-9 (LIN) - Body ground
Always
10 KΩ or higher

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
F4-9 (LIN) - Body ground	Always	Below 0.5 V

Text in Illustration
*1	Front view of wire harness connector (to Power Window Regulator Master Switch Assembly)
*2	Front view of wire harness connector (to Front Door Window Regulator Sub-Assembly LH)

Reconnect the power window regulator master switch assembly connector.

Reconnect the front door window regulator sub-assembly LH connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - EACH ECU)

Disconnect the 3C instrument panel junction block assembly connector.

Disconnect the F1 power window regulator master switch assembly connector.

Disconnect the E4 front door window regulator sub-assembly RH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3C-28 (LIN2) - F1-17 (LIN1)	Always	Below 1 Ω
3C-27 (LIN2) - E4-9 (LIN)	Always	Below 1 Ω
3C-28 (LIN2) - Body ground	Always	10 KΩ or higher
3C-27 (LIN2) - Body ground	Always	10 KΩ or higher

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
3C-28 (LIN2) - Body ground	Always	Below 0.5 V
3C-27 (LIN2) - Body ground	Always	Below 0.5 V

Text in Illustration
*1	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)
*2	Front view of wire harness connector (to Power Window Regulator Master Switch Assembly)
*3	Front view of wire harness connector (to Front Door Window Regulator Sub-Assembly RH)

Reconnect the instrument panel junction block assembly connector.

Reconnect the power window regulator master switch assembly connector.

Reconnect the front door window regulator sub-assembly RH connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.CHECK FOR DTC

Disconnect the F1 power window regulator master switch assembly connector.

Connect the 3C instrument panel junction block assembly, E4 front door window regulator sub-assembly RH and F4 front door window regulator sub-assembly LH connectors.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is output
A
DTC B2325 is not output
B

Go to step 18

A

13.CHECK FOR DTC

Disconnect the E4 front door window regulator sub-assembly RH connector.

Connect the 3C instrument panel junction block assembly, F1 power window regulator master switch assembly and F4 front door window regulator sub-assembly LH connectors.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is output
A
DTC B2325 is not output
B

Go to step 20

A

14.CHECK FOR DTC

Disconnect the F4 front door window regulator sub-assembly LH connector.

Connect the 3C instrument panel junction block assembly, F1 power window regulator master switch assembly and E4 front door window regulator sub-assembly RH connectors.

Check for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is output
A
DTC B2325 is not output
B

Go to step 22

A

15.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Text in Illustration
*1	Component without harness connected (Instrument Panel Junction Block Assembly)

Remove the instrument panel junction block assembly (Click here).

Remove the main body ECU from the instrument panel junction block assembly (Click here).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3C-27 (LIN2) - 3F-16 (LIN2)	Always	Below 1 Ω
3C-28 (LIN2) - 3F-16 (LIN2)	Always	Below 1 Ω
3C-27 (LIN2) - Body ground	Always	10 KΩ or higher
3C-28 (LIN2) - Body ground	Always	10 KΩ or higher

Reinstall the main body ECU (Click here).

Reinstall the instrument panel junction block assembly (Click here).

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)

REPLACE MAIN BODY ECU (Click here)

16.REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY NORMAL ONE

Replace the double lock door control relay assembly with a normally functioning part (Click here).

Clear DTCs (Click here).

NEXT

17.RECONFIRM DTC OUTPUT

Recheck for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is not output
A
DTC B2325 is output
B

Go to step 24

END (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY MALFUNCTION)

18.REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY NORMAL ONE

Replace the power window regulator master switch assembly with a normally functioning part (Click here).

Clear DTCs (Click here).

NEXT

19.RECONFIRM DTC OUTPUT

Recheck for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is not output
A
DTC B2325 is output
B

Go to step 24

END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY MALFUNCTION)

20.REPLACE FRONT DOOR WINDOW REGULATOR SUB-ASSEMBLY RH NORMAL ONE

Replace the front door window regulator sub-assembly RH with a normally functioning part (Click here).

Clear DTCs (Click here).

NEXT

21.RECONFIRM DTC OUTPUT

Recheck for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is not output
A
DTC B2325 is output
B

Go to step 24

END (FRONT DOOR WINDOW REGULATOR SUB-ASSEMBLY RH MALFUNCTION)

22.REPLACE FRONT DOOR WINDOW REGULATOR SUB-ASSEMBLY LH NORMAL ONE

Replace the front door window regulator sub-assembly LH with a normally functioning part (Click here).

Clear DTCs (Click here).

NEXT

23.RECONFIRM DTC OUTPUT

Recheck for DTCs (Click here).
Result
Result
Proceed to
DTC B2325 is not output
A
DTC B2325 is output
B

Go to step 24

END (FRONT DOOR WINDOW REGULATOR SUB-ASSEMBLY LH MALFUNCTION)

24.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Text in Illustration
*1	Component without harness connected (Instrument Panel Junction Block Assembly)

Remove the instrument panel junction block assembly (Click here).

Remove the main body ECU from the instrument panel junction block assembly (Click here).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3C-27 (LIN2) - 3F-16 (LIN2)	Always	Below 1 Ω
3C-28 (LIN2) - 3F-16 (LIN2)	Always	Below 1 Ω
3C-27 (LIN2) - Body ground	Always	10 KΩ or higher
3C-28 (LIN2) - Body ground	Always	10 KΩ or higher

Reinstall the main body ECU (Click here).

Reinstall the instrument panel junction block assembly (Click here).

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)

REPLACE MAIN BODY ECU (Click here)