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 output when LIN communication between the power window regulator motor (Driver side) and main body ECU (Instrument panel junction block assembly) stops for more than 10 seconds.

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTICE:
When using the Techstream with the ignition switch off to troubleshoot:
Connect the Techstream to the vehicle, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

PROCEDURE

1. CHECK FOR DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTC.
OK:
B2321 is not output.
NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - POWER WINDOW REGULATOR MOTOR)
OK -- USE SIMULATION METHOD TO CHECK
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - POWER WINDOW REGULATOR MOTOR)
(a) Disconnect the E8 and I5 connectors.

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

(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:

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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. REPLACE POWER WINDOW REGULATOR MOTOR (DRIVER SIDE)
(a) Replace the power window regulator motor (Driver side) Removal.
NEXT -- Continue to next step.
5. CHECK FOR DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTC.
OK:
B2321 is not output.
NG -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
OK -- END (POWER WINDOW REGULATOR MOTOR (DRIVER SIDE) IS DEFECTIVE)