DTC    B2321    Driver Side Door ECU Communication Stop

for Preparation Click here


DESCRIPTION

The main body ECU stores a DTC when communication with the front door window regulator sub-assembly RH*1 or the front door window regulator sub-assembly LH*2 is interrupted for 10 seconds or more.

DTC No.
DTC Detection Condition
Trouble Area
B2321
Communication between front door window regulator sub-assembly RH*1 or the front door window regulator sub-assembly LH*2 and main body ECU interrupted for 10 seconds or more, or communication wire malfunction.
  1. Harness or connector
  2. Front door window regulator sub-assembly RH*1
  3. Front door window regulator sub-assembly LH*2
  4. Main body ECU
*1: for RHD
*2: for LHD

WIRING DIAGRAM


E176072E01


E176072E02


INSPECTION PROCEDURE

HINT:
  1. 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.
  2. 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.

NOTICE:
Inspect the fuses for this circuit before starting this inspection procedure.

1.CLEAR DTC

  1. Clear DTCs (Click here).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B2321 is output
    		A
    DTC B2321 and B1206 are output
    		B
    DTC B2321, B1206 and/or B2325 are output

    HINT:
    1. When both B1206 and B2321 are output at the same time, troubleshoot B1206 first.
    2. When both B1206 and B2325 are output at the same time, troubleshoot B2325 first.



B
GO TO DIAGNOSTIC TROUBLE CODE CHART (Click here)
A


3.SYSTEM CHECK

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



B
Go to step 8
A


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


    E175951E02

  1. Disconnect the E1 power window regulator master switch assembly connector.

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

  1. 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

  1. 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)

  1. Reconnect the power window regulator master switch assembly connector.

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (REGULATOR RH - BATTERY AND BODY GROUND)


    E175952E02

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

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E4-2 (B) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E4-1 (GND) - Body ground
    		Always
    		Below 1 Ω

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

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

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

  1. Clear DTCs (Click here).


NEXT


7.RECONFIRM DTC OUTPUT

  1. Recheck for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B2321 is not output
    		A
    DTC B2321 is output
    		B



B
REPLACE MAIN BODY ECU (Click here)
A

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

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


    E175951E01

  1. Disconnect the F1 power window regulator master switch assembly connector.

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

  1. 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

  1. 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)

  1. Reconnect the power window regulator master switch assembly connector.

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK HARNESS AND CONNECTOR (REGULATOR LH - BATTERY AND BODY GROUND)


    E175952E01

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

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    F4-2 (B) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F4-1 (GND) - Body ground
    		Always
    		Below 1 Ω

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

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

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

  1. Clear DTCs (Click here).


NEXT


11.RECONFIRM DTC OUTPUT

  1. Recheck for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B2321 is not output
    		A
    DTC B2321 is output
    		B



B
REPLACE MAIN BODY ECU (Click here)
A

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