B2321

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

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
* When using the Techstream, repeatedly turn either front door courtesy light switch off-and-on at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins.
* 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 circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CLEAR DTC

(a) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





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

B -- GO TO DIAGNOSTIC TROUBLE CODE CHART LIN Communication System
A -- Continue to next step.

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

(a) Disconnect the F1 power window regulator master switch assembly connector.





(b) Disconnect the F4 front door window regulator sub-assembly LH connector.

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

Standard Resistance:





Text in Illustration





(d) Reconnect the power window regulator master switch assembly connector.

(e) Reconnect the front door window regulator sub-assembly LH connector.

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

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

(a) Disconnect the F4 front door window regulator sub-assembly LH connector.





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

Standard Voltage:





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

Standard Resistance:





Text in Illustration





(d) Reconnect the front door window regulator sub-assembly LH connector.

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

5. REPLACE FRONT DOOR WINDOW REGULATOR SUB-ASSEMBLY LH WITH A NORMAL ONE

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

(b) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

6. RECONFIRM DTC OUTPUT

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

Result





B -- REPLACE MAIN BODY ECU Removal

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