B2321

MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM: B2321: Driver Side Door ECU Communication Stop
B2321 - Driver Side Door ECU Communication Stop

DESCRIPTION

This DTC is output when LIN communication between the front power window regulator motor LH and main body ECU (driver side junction block) stops for 10 seconds or more.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When using the Techstream with the engine switch off to troubleshoot:

Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

HINT
DTC B2325 is output when the communication between all of the following components and main body ECU (driver side junction block) stops.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Recheck for DTC Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B2321 is not output.

NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT POWER WINDOW REGULATOR MOTOR)

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT POWER WINDOW REGULATOR MOTOR)

(a) Disconnect the L11 ECU connector.





(b) Disconnect the N11 motor connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK FRONT POWER WINDOW REGULATOR MOTOR LH (BATTERY VOLTAGE AND GROUND)

(a) Disconnect the N11 motor connector.





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

Standard resistance:





Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

(a) Temporarily replace the front power window regulator motor LH with a new or normally functioning one Disassembly.

(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

6. CHECK FOR DTC

(a) Recheck for DTC Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B2321 is not output.

NG -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

OK -- END (FRONT POWER WINDOW REGULATOR MOTOR LH IS DEFECTIVE)