B2321

MULTIPLEX COMMUNICATION: 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 power window regulator motor assembly (for driver side) and main body ECU (instrument panel junction block) stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- When the power window regulator motor assembly (for driver side) is replaced or removed and reinstalled, it requires initialization Programming and Relearning.
- When using the Techstream to troubleshoot with the engine 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.

PROCEDURE

1. CHECK DTC OUTPUT
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs.
Result:





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

B -- GO TO DTC B1206
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR - BATTERY AND BODY GROUND)
(a) Disconnect the I4 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, OR REPLACE FUSE
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (MASTER SWITCH - POWER WINDOW REGULATOR MOTOR ASSEMBLY)




(a) Disconnect the I5 switch connector.
(b) 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. INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY




(a) Remove the multiplex network master switch assembly Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
OK -- Continue to next step.
5. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER SIDE)
(a) Replace the power window regulator motor assembly (for driver side) Removal.
NEXT -- Continue to next step.
6. CHECK DTC OUTPUT
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs.
OK:
DTC B2321 is not output.
NG -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
OK -- END (POWER WINDOW REGULATOR MOTOR ASSEMBLY WAS DEFECTIVE)