Dtc B1243 Gsw Terminal Circuit Malfunction

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Door Lock. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK MAIN BODY ECU (GSW VOLTAGE)

CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - AIRBAG SENSOR ASSEMBLY)

INSPECT COWL SIDE JUNCTION BLOCK LH

DTC B1243 GSW Terminal Circuit Malfunction


DESCRIPTION

If the collision door lock release function does not operate normally, or an open or short in the GSW input circuit of the main body ECU is detected, DTC B1243 is stored.
HINT:
If DTC B1243 is stored, the speed-sensitive automatic door lock function, shift-linked automatic door lock function, and collision door lock release function are prohibited.

DTC Code
DTC Detection Condition
Trouble Area
B1243
When either of the following occurs:
  1. An open or short in the GSW input circuit of the main body ECU.
  2. The collision door lock release function does not operate normally.
  1. Harness or connector
  2. Airbag sensor assembly
  3. Main body ECU

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Door Lock.Power Door Lock Control System. Dtc B1243 Gsw Terminal Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work (Click here).
  2. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (Click here).
  3. As the door control battery is installed between the vehicle battery and main body ECU, first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU before performing this troubleshooting procedure (Click here).
1.CHECK FOR DTC

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1243 is not output.


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (Click here)

2.CHECK MAIN BODY ECU (GSW VOLTAGE)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Door Lock.Power Door Lock Control System. Dtc B1243 Gsw Terminal Circuit Malfunction

  1. Disconnect the cable from the negative (-) battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
    NOTICE:
    Turning the ignition switch to ON with the airbag ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  1. Disconnect the airbag sensor assembly connector (Click here).

  1. Connect the cable to the negative (-) battery terminal.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E47-18 (GSW) - Body ground
    		Ignition switch ON
    		2.8 to 4.3V
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Airbag Sensor Assembly)


NG
REPLACE AIRBAG SENSOR ASSEMBLY (Click here)
OK


3.CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - AIRBAG SENSOR ASSEMBLY)

  1. Disconnect the cable from the negative (-) battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
    NOTICE:
    Turning the ignition switch to ON with the airbag ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  1. Disconnect the 2I cowl side junction block LH connector.

  1. Disconnect the E47 airbag sensor assembly connector (Click here)

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2I-7 - E47-18 (GSW)
    		Always
    		Below 1 Ω
    2I-7 or E47-18 (GSW) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT COWL SIDE JUNCTION BLOCK LH

  1. Remove the cowl side junction block LH.

    1. for LHD: Click here
    2. for RHD: Click here

  1. Remove the main body ECU from the cowl side junction block LH.



  1. Measure the resistance according to the value(s) in the table below.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Door Lock.Power Door Lock Control System. Dtc B1243 Gsw Terminal Circuit Malfunction


    Text in Illustration
    *a
    		Component without harness connected
    (Cowl Side Junction Block LH)
    		-
    		-
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A-24(GSW) - 2I-7
    		Always
    		Below 1 Ω
    Result
    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG (for LHD)
    		C
    NG (for RHD)
    		D


B
REPLACE MAIN BODY ECU (for RHD) (Click here)

C
REPLACE COWL SIDE JUNCTION BLOCK LH (for LHD) (Click here)

D
REPLACE COWL SIDE JUNCTION BLOCK LH (for RHD) (Click here)
A

REPLACE MAIN BODY ECU (for LHD) (Click here)