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

Dtc B2074 Driver Side Seat Belt Buckle Switch Circuit Malfunction. PRE-CRASH SAFETY. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

NOTICE:

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

HINT:

DTC U0151: Lost Communication with Airbag ECU

GO TO CAN COMMUNICATION SYSTEM (DIAGNOSIS SYSTEM) ()

A

2.CHECK DTC (AIRBAG SYSTEM)

Using the intelligent tester, enter the following menus: Body / SRS Airbag / Trouble Code.

Clear the DTCs ().

Check for DTCs ().

OK:
DTC B1655 is not output.

HINT:

DTC B1655: Driver Side Seat Belt Buckle Switch Circuit Malfunction

GO TO AIRBAG SYSTEM (DTC B1655) ()

OK

3.CHECK DTC (PRE-CRASH SAFETY SYSTEM)

Using the intelligent tester, enter the following menus: Body / Pre-Crash / Trouble Code.

Clear the DTCs ().

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 ()

USE SIMULATION METHOD TO CHECK ()