DTC    B2325    LIN Communication Bus Malfunction

for Preparation Click here


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.
DTC Detection Condition
Trouble Area
B2325
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.
  1. Power window regulator motor assembly (for driver door)
  2. Sliding roof ECU (sliding roof drive gear assembly)*
  3. Main body ECU (multiplex network body ECU)
  4. Instrument panel junction block assembly
  5. Wire harness or connector
  1. *: w/ Sliding Roof System

WIRING DIAGRAM


B302055E03


INSPECTION PROCEDURE

NOTICE:
  1. When the sliding roof ECU (sliding roof drive gear assembly) is replaced or removed and reinstalled, it requires initialization (Click here).*
  2. When the power window regulator motor assembly (for driver door) is replaced or removed and reinstalled, it requires initialization (Click here).
  3. When using the Techstream to troubleshoot with the ignition switch off:
    Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
  1. *: w/ Sliding Roof System
1.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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



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


    B302057E01

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

    HINT:
    This inspection is to check the LIN 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
    3B-12 (LIN2) - MB-16 (LIN2)
    		Always
    		Below 1 Ω
    3A-4 (LIN2) - MB-16 (LIN2)*
    		Always
    		Below 1 Ω
    1. *: w/ Sliding Roof System

    Text in Illustration 
    *a
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)
    		*b
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)
    *c
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)
    		-
    		-

  1. Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.

  1. Install the instrument panel junction block assembly (Click here).



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)
OK


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

  1. Disconnect the Q3 sliding roof ECU (sliding roof drive gear assembly) connector*.

  1. Disconnect the J3 power window regulator motor (for driver door) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3B-12 (LIN2) - J3-9 (LIN)
    		Always
    		Below 1 Ω
    3A-4 (LIN2) - Q3-11 (MPX1)*
    		Always
    		Below 1 Ω
    J3-9 (LIN) - Body ground
    		Always
    		10 kΩ or higher
    Q3-11 (MPX1) - Body ground*
    		Always
    		10 kΩ or higher
    1. *: w/ Sliding Roof System


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK DTC OUTPUT (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER DOOR))

  1. Reconnect the 3B and 3A instrument panel junction block assembly connector.

  1. Reconnect the Q3 sliding roof ECU (sliding roof drive gear assembly) connector*.

  1. Clear the DTC (Click here).

  1. After 10 seconds have elapsed, check if the trouble occurs again.

  1. Check for DTCs again.

    1. *: w/ Sliding Roof System

    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


B
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

C
REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER DOOR) (Click here)
A


4.CHECK DTC OUTPUT (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY))

  1. Reconnect the J3 power window regulator motor (for driver door) connector.

  1. Disconnect the Q3 sliding roof ECU (sliding roof drive gear assembly) connector.

  1. Clear the DTC (Click here).

  1. After 10 seconds have elapsed, check if the trouble occurs again.

  1. Check for DTCs again.

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


B
REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) (Click here)
A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)