B2321

NETWORKING: LIN COMMUNICATION SYSTEM: B2321: Driver Side Door ECU Communication Stop

DTC B2321 - Driver Side Door ECU Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the front power window regulator motor assembly LH and main body ECU stops for 10 seconds or more.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE:
When using the Techstream with the ignition 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 stored when the communication between the front power window regulator motor assembly LH and main body ECU stops.
- When DTC B1206 and B2321 are output simultaneously, perform the troubleshooting for DTC B1206 first B1206.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - REGULATOR MOTOR LH)




(a) Disconnect the H2 main body ECU connector.
(b) Disconnect the M3 front power window regulator motor assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the main body ECU connector.
(e) Reconnect the front power window regulator motor assembly LH connector.

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

2. CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (REGULATOR MOTOR LH - BATTERY AND BODY GROUND)




(a) Disconnect the M3 front power window regulator motor assembly LH connector.
(b) Measure the resistance and voltage according to the value(s) in the tables below.

Standard Resistance:





Standard Voltage:





(c) Reconnect the front power window regulator motor assembly LH connector.

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

3. REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH
(a) Temporarily replace the front power window regulator motor assembly LH with a new or normally functioning one Removal.
(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
NEXT -- Continue to next step.

4. CHECK FOR DTC
(a) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE MAIN BODY ECU
A -- END (FRONT POWER WINDOW REGULATOR MOTOR LH IS DEFECTIVE)