DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK DTC (CAN COMMUNICATION SYSTEM)
CHECK DTC (AIRBAG SYSTEM)
CHECK DTC (PRE-CRASH SAFETY SYSTEM)
DTC B2074 Driver Side Seat Belt Buckle Switch Circuit Malfunction
DESCRIPTION
This DTC is stored when there is a malfunction in the front seat inner belt buckle switch circuit for the driver side. The seat belt control ECU receives buckle switch condition information from the center airbag sensor via the CAN communication line and controls the pre-crash safety system.
When DTC B2074 is stored, DTC B1655 is also output.
| DTC Code | DTC Detection Condition | Trouble Area |
| B2074 |
Malfunction in the front seat inner belt (buckle switch) circuit. |
Front seat inner belt LH assembly
Center airbag sensor
Seat belt control ECU
CAN communication system
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- If DTC B1655 is not cleared, DTC B2074 continues to be output.
| 1.CHECK DTC (CAN COMMUNICATION SYSTEM) |
Use the intelligent tester to check if the CAN communication system is functioning normally ( for LHD, for RHD).
Result| Result | Proceed to |
OK
(DTC U0151 is not output) | A |
NG
(for LHD) | B |
NG
(for RHD) | C |
- DTC U0151: Lost Communication with Airbag ECU
| | GO TO CAN COMMUNICATION SYSTEM (DIAGNOSIS SYSTEM) ()
|
|
|
| | GO TO CAN COMMUNICATION SYSTEM (DIAGNOSIS SYSTEM) ()
|
|
|
| 2.CHECK DTC (AIRBAG SYSTEM) |
Using the intelligent tester, enter the following menus: Body / SRS Airbag / Trouble Code.
Check for DTCs ().
- OK:
- DTC B1655 is not output.
- DTC B1655: Driver Side Seat Belt Buckle Switch Circuit Malfunction
| | GO TO AIRBAG SYSTEM (DTC B1655) ()
|
|
|
| 3.CHECK DTC (PRE-CRASH SAFETY SYSTEM) |
Using the intelligent tester, enter the following menus: Body / Pre-Crash / Trouble Code.
Check for DTCs ().
Result| Result | Proceed to |
OK
(DTC B2074 is not output) | A |
NG
(for LHD) | B |
NG
(for RHD) | C |
| | REPLACE SEAT BELT CONTROL ECU ()
|
|
|
| | REPLACE SEAT BELT CONTROL ECU ()
|
|
|
| A | |
| |
| USE SIMULATION METHOD TO CHECK ()
|
|