Dtc B2321 Driver Side Door Ecu Communication Stop
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CLEAR DTC
CHECK FOR DTC
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT POWER WINDOW REGULATOR MOTOR)
CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY (BATTERY VOLTAGE AND BODY GROUND)
REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY
CHECK FOR DTC
DTC B2321 Driver Side Door ECU Communication Stop
DESCRIPTION
This DTC is stored when LIN communication between the front power window regulator motor LH*1 (RH*2) and main body ECU (cowl side junction block LH) stops for 10 seconds or more.
| DTC Code | DTC Detection Condition | Trouble Area |
| B2321 | No communication between the front power window regulator motor LH*1 or RH*2 and main body ECU (cowl side junction block LH) for 10 seconds or more. | Front power window regulator motor LH*1
Front power window regulator motor RH*2
Main body ECU (cowl side junction block LH)
Harness or connector
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- When using the intelligent tester with the ignition switch off to troubleshoot:
- Connect the intelligent tester to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
- DTC B2325 is stored when the communication between the front power window regulator motor and main body ECU (cowl side junction block LH) stops.
Recheck for DTCs ().
Result| Result | Proceed to |
| DTC B2321 is output | A |
| DTC B2321 is not output | B |
| | USE SIMULATION METHOD TO CHECK ()
|
|
|
| 3.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT POWER WINDOW REGULATOR MOTOR) |
Disconnect the E3 ECU connector.
Disconnect the I12*1 or I4*2 motor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E3-10 (LIN2) - I12-9 (LIN)*1 or I4-9 (LIN)*2 | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY (BATTERY VOLTAGE AND BODY GROUND) |
Disconnect the I12*1 or I4*2 motor connector.
Measure the resistance and voltage according to the value(s) in the tables below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| I12-1 (GND)*1 or I4-1 (GND)*2 - Body ground | Always | Below 1 Ω |
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| I12-2 (B)*1 or I4-2 (B)*2 - Body ground | Always | 11 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 5.REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY |
Temporarily replace the front power window regulator motor LH*1 or RH*2 with a new or normally functioning one ().
Recheck for DTCs ().
Result| Result | Proceed to |
| DTC B2321 is not output | A |
| DTC B2321 is output | B |
| | REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) |
|
|
| A | |
| |
| END (FRONT POWER WINDOW REGULATOR MOTOR IS DEFECTIVE) |
|
