Dtc B1243 Gsw Terminal Circuit Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - CENTER AIRBAG SENSOR)

CHECK MAIN BODY ECU (GSW VOLTAGE)

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 (driver side junction block assembly) 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
Either condition is met:
  1. An open or short in the GSW input circuit of the main body ECU (multiplex network body ECU).
  2. The collision door lock release function does not operate normally.
  1. Center airbag sensor assembly
  2. Harness or connector
  3. Main body ECU (multiplex network body ECU)

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Door Lock.Power Door Lock Control System. Dtc B1243 Gsw Terminal Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. w/ Navigation system:
    After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.
  2. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).
1.CHECK FOR DTC

  1. Clear the DTCs (LandCruiser RM000000TNX0ATX.html).

  1. Check for DTCs (LandCruiser RM000000TNX0ATX.html).

    Result
    Result
    		Proceed to
    DTC B1243 is output
    		A
    DTC B1243 is not output
    		B


B
USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)
A


2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - CENTER AIRBAG SENSOR)

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

  1. Remove the main body ECU (LandCruiser RM000000TNX0ATX.html).

  1. Disconnect the G1 center airbag sensor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G1-18 (GSW) - A-24 (GSW)
    		Always
    		Below 1 Ω
    G1-18 (GSW) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK MAIN BODY ECU (GSW VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Door Lock.Power Door Lock Control System. Dtc B1243 Gsw Terminal Circuit Malfunction

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

  1. Disconnect the G1 center airbag sensor connector.

  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
    G1-18 (GSW) - Body ground
    		Ignition switch ON
    		4.5 to 5.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Center Airbag Sensor)


NG
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (LandCruiser RM000003WBO05FX.html)
OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (LandCruiser RM000003YQB01BX.html)