DTC B2325: LIN Communication Bus Malfunction [09/2014 - ]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [09/2014 - ]

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. 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
   4B-21 - MB-16 (LIN2)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  2

1. Disconnect the S2 power window regulator motor assembly (for driver door) connector.
2. Disconnect the R2 power window regulator motor assembly (for front passenger door) connector.
3. Disconnect the S10*1 or S3*2 multiplex network master switch assembly connector.
   1. *1: w/o Seat Position Memory System
   2. *2: w/ Seat Position Memory System
4. Disconnect the W5 sliding roof ECU (sliding roof drive gear sub-assembly) connector.*
   1. *: w/ Sliding Roof System
5. Measure the resistance according to the value(s) in the table below.
   NOTE:

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4B-21 - S10-7 (LIN1)*1	Engine switch off	Below 1 Ω
   4B-21 - S3-17 (LIN1)*2	Engine switch off	Below 1 Ω
   4B-21 - W5-11 (MPX1)*3	Engine switch off	Below 1 Ω
   4B-21 - R2-9 (LIN)	Engine switch off	Below 1 Ω
   4B-21 - S2-9 (LIN)	Engine switch off	Below 1 Ω
   S10-7 (LIN1) - Body ground*1	Engine switch off	10 kΩ or higher
   S3-17 (LIN1) - Body ground*2	Engine switch off	10 kΩ or higher
   W5-11 (MPX1) - Body ground*3	Engine switch off	10 kΩ or higher
   4B-21 - Body ground	Engine switch off	10 kΩ or higher
   R2-9 (LIN) - Body ground	Engine switch off	10 kΩ or higher
   S2-9 (LIN) - Body ground	Engine switch off	10 kΩ or higher

   1. *1: w/o Seat Position Memory System
   2. *2: w/ Seat Position Memory System
   3. *3: w/ Sliding Roof System

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Reconnect the S2 power window regulator motor assembly (for driver door) connector.
2. Reconnect the R2 power window regulator motor assembly (for front passenger door) connector.
3. Reconnect the W5 sliding roof ECU (sliding roof drive gear sub-assembly) connector.*
   1. *: w/ Sliding Roof System
4. Reconnect the 4B instrument panel junction block assembly connector.
5. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - ]

   Body Electrical > Main Body > Clear DTCs 

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

   Body Electrical > Main Body > Trouble Codes 

   Result

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

Result: 

B 

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

Result: 

A 

See step  4

1. Reconnect the S10*1 or S3*2 multiplex network master switch assembly connector.
   1. *1: w/o Seat Position Memory System
   2. *2: w/ Seat Position Memory System
2. Disconnect the S2 power window regulator motor assembly (for driver door) connector.
3. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - ]

   Body Electrical > Main Body > Clear DTCs 

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

   Body Electrical > Main Body > Trouble Codes 

   Result

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

Result: 

B 

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door). Refer to  REMOVAL [09/2014 - ] 

Result: 

A 

See step  5

1. Reconnect the S2 power window regulator motor assembly (for driver door) connector.
2. Disconnect the R2 power window regulator motor assembly (for front passenger door) connector.
3. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - ]

   Body Electrical > Main Body > Clear DTCs 

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

   Body Electrical > Main Body > Trouble Codes 

   Result

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

Result: 

B 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

Result: 

C 

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Front Passenger Door). Refer to  REMOVAL [09/2014 - ] 

Result: 

A 

See step  6

1. Reconnect the R2 power window regulator motor assembly (for front passenger door) connector.
2. Disconnect the W5 sliding roof ECU (sliding roof drive gear sub-assembly) connector.
3. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - ]

   Body Electrical > Main Body > Clear DTCs 

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

   Body Electrical > Main Body > Trouble Codes 

   Result

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

Result: 

A 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

Result: 

B 

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY). Refer to  DISASSEMBLY [09/2014 - ]