DTC    B2321    Driver Side Door ECU Communication Stop

for Preparation Click here


DESCRIPTION

This DTC is stored when LIN communication between the power window regulator motor assembly (for driver side) and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No.
DTC Detection Condition
Trouble Area
B2321
No communication between power window regulator motor assembly (for driver side) and main body ECU (multiplex network body ECU) for 10 seconds or more.
  1. Power window regulator motor assembly (for driver side)
  2. Main body ECU (multiplex network body ECU)
  3. Multiplex network master switch assembly
  4. Wire harness or connector
  5. D FR DOOR fuse

WIRING DIAGRAM


B228561E08


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. When a power window regulator motor assembly is replaced or removed and reinstalled, it requires initialization (Click here).
  3. When using the intelligent tester to troubleshoot with the power switch off:
    Connect the intelligent tester to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.

1.CHECK DTC OUTPUT

  1. Clear the DTC (Click here).

  1. Recheck for DTCs.

    Result:
    Result
    		Proceed to
    Only DTC B2321 is output.
    		A
    DTC B1206 and B2321 are output simultaneously.
    		B

    HINT:
    When DTC B1206 and B2321 are output simultaneously, perform troubleshooting for DTC B1206 first.



B
GO TO DTC B1206 (Click here)
A


2.CHECK HARNESS AND CONNECTOR (MASTER SWITCH - DRIVER SIDE POWER WINDOW REGULATOR MOTOR)

  1. Disconnect the K5*1 or J9*2 multiplex network master switch connector.

  1. Disconnect the K2*1 or J2*2 power window regulator motor (for driver side) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K5-16 (LIN2) - K2-9 (LIN)*1
    J9-16 (LIN2) - J2-9 (LIN)*2
    		Always
    		Below 1 Ω
    K5-16 (LIN2) - Body ground*1
    J9-16 (LIN2) - Body ground*2
    		Always
    		10 kΩ or higher

    1. *1: for LHD
    2. *2: for RHD



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY


    B203350E07

  1. Remove the multiplex network master switch assembly (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    16 (LIN2) - 17 (LIN1)
    		Always
    		Below 1 Ω
    16 (LIN2) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Component without harness connected
    (Multiplex Network Master Switch Assembly)



NG
REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR - BATTERY, BODY GROUND)

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    K2-2 (B) - Body ground*1
    J2-2 (B) - Body ground*2
    		Power switch off
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K2-1 (GND) - Body ground*1
    J2-1 (GND) - Body ground*2
    		Always
    		Below 1 Ω

    1. *1: for LHD
    2. *2: for RHD



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER SIDE)

  1. Replace the power window regulator motor assembly (for driver side) (Click here).


NEXT


6.CHECK DTC OUTPUT

  1. Clear the DTC (Click here).

  1. Check for DTCs.

    OK:
    DTC B2321 is not output.



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

END (POWER WINDOW REGULATOR MOTOR ASSEMBLY WAS DEFECTIVE)