B2321

NETWORKING: LIN COMMUNICATION SYSTEM: B2321: Driver Side Door ECU Communication Stop
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 (multiplex network body ECU) stops for 10 seconds or more.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* When a power window regulator motor assembly is replaced or removed and reinstalled, it requires initialization Initialization.
* When using the Techstream to troubleshoot with the power 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 (MASTER SWITCH - POWER WINDOW REGULATOR MOTOR)

(a) Disconnect the I1 multiplex network master switch assembly connector.

(b) Disconnect the I6 power window regulator motor assembly (for driver side) 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.

3. 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:





Text in Illustration





NG -- REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY Removal
OK -- Continue to next step.

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

(a) 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 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) Check for DTCs.

OK:

DTC B2321 is not output.

NG -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal

OK -- END (POWER WINDOW REGULATOR MOTOR ASSEMBLY WAS DEFECTIVE)