Dtc B2074 Driver Side Seat Belt Buckle Switch Circuit Malfunction

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Pre-Crash Safety. Land Cruiser. Urj200, 202 Grj200 Vdj200

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.
  1. Front seat inner belt LH assembly
  2. Center airbag sensor
  3. Seat belt control ECU
  4. CAN communication system

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Pre-Crash Safety.Pre-Crash Safety System. Dtc B2074 Driver Side Seat Belt Buckle Switch Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
If DTC B1655 is not cleared, DTC B2074 continues to be output.
1.CHECK DTC (CAN COMMUNICATION SYSTEM)

  1. Use the intelligent tester to check if the CAN communication system is functioning normally (Click here for LHD, Click here 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


B
GO TO CAN COMMUNICATION SYSTEM (DIAGNOSIS SYSTEM) (Click here)

C
GO TO CAN COMMUNICATION SYSTEM (DIAGNOSIS SYSTEM) (Click here)
A


2.CHECK DTC (AIRBAG SYSTEM)

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

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1655 is not output.
    HINT:
    DTC B1655: Driver Side Seat Belt Buckle Switch Circuit Malfunction


NG
GO TO AIRBAG SYSTEM (DTC B1655) (Click here)
OK


3.CHECK DTC (PRE-CRASH SAFETY SYSTEM)

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

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    Result
    Result
    		Proceed to
    OK
    (DTC B2074 is not output)
    		A
    NG
    (for LHD)
    		B
    NG
    (for RHD)
    		C


B
REPLACE SEAT BELT CONTROL ECU (Click here)

C
REPLACE SEAT BELT CONTROL ECU (Click here)
A

USE SIMULATION METHOD TO CHECK (Click here)