Dtc B1905/74 Short In Front Pretensioner Squib Lh Circuit

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Supplemental Restraint Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FRONT SEAT OUTER BELT LH (FRONT PRETENSIONER SQUIB LH)

CHECK CONNECTOR

CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT)

CHECK CENTER AIRBAG SENSOR

DTC B1905/74 Short in Front Pretensioner Squib LH Circuit

DTC B1906/74 Open in Front Pretensioner Squib LH Circuit

DTC B1907/74 Short to GND in Front Pretensioner Squib LH Circuit

DTC B1908/74 Short to B+ in Front Pretensioner Squib LH Circuit


DESCRIPTION

The front pretensioner squib LH circuit consists of the center airbag sensor and the front seat outer belt LH.
This circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are stored when a malfunction is detected in the front pretensioner squib LH circuit.

DTC Code
DTC Detection Condition
Trouble Area
B1905/74
When one of the following conditions is met:
  1. The center airbag sensor receives a line short circuit signal 5 times in the front pretensioner squib LH circuit during the primary check.
  2. A front pretensioner squib LH malfunction.
  3. A center airbag sensor malfunction.
  1. Floor wire
  2. Front seat outer belt assembly LH (Front pretensioner squib LH)
  3. Center airbag sensor assembly
B1906/74
When one of the following conditions is met:
  1. The center airbag sensor receives an open circuit signal in the front pretensioner squib LH circuit for 2 seconds.
  2. A front pretensioner squib LH malfunction.
  3. A center airbag sensor malfunction.
  1. Floor wire
  2. Front seat outer belt assembly LH (Front pretensioner squib LH)
  3. Center airbag sensor assembly
B1907/74
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to ground signal in the front pretensioner squib LH circuit for 0.5 seconds.
  2. A front pretensioner squib LH malfunction.
  3. A center airbag sensor malfunction.
  1. Floor wire
  2. Front seat outer belt assembly LH (Front pretensioner squib LH)
  3. Center airbag sensor assembly
B1908/74
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to B+ signal in the front pretensioner squib LH circuit for 0.5 seconds.
  2. A front pretensioner squib LH malfunction.
  3. A center airbag sensor malfunction.
  1. Floor wire
  2. Front seat outer belt assembly LH (Front pretensioner squib LH)
  3. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1905/74 Short In Front Pretensioner Squib Lh Circuit


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1905/74 Short In Front Pretensioner Squib Lh Circuit


INSPECTION PROCEDURE

NOTICE:
  1. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).
  2. When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).
  3. After replacing the center airbag sensor assembly, refer to initialization (Click here).
HINT:
To perform the simulation method, enter the check mode (signal check) with the intelligent tester (Click here), and then wiggle each connector of the airbag system or drive the vehicle on various type of road (Click here).
1.CHECK FRONT SEAT OUTER BELT LH (FRONT PRETENSIONER SQUIB LH)


  1. Turn the ignition switch off.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1905/74 Short In Front Pretensioner Squib Lh Circuit

  1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

  1. Disconnect the connectors from the front seat outer belt LH.

  1. Connect the yellow wire side of SST (resistance: 2.1 Ω) to connector C.

    CAUTION:
    Never connect the tester to the front seat outer belt LH (front pretensioner squib LH) for measurement, as this may lead to a serious injury due to airbag deployment.
    NOTICE:
    1. Do not forcibly insert SST into the terminals of the connector when connecting SST.
    2. Insert SST straight into the terminals of the connector.
SST
09843-18061

  1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    OK:
    DTC B1905, B1906, B1907 or B1908 is not output.
    HINT:
    Codes other than DTC B1905, B1906, B1907 and B1908 may be output at this time, but they are not related to this check.


NG
Go to step 2
OK

REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH (Click here)

2.CHECK CONNECTOR

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

  1. Disconnect SST from connector C.

  1. Check that the floor wire connector (on the front seat outer belt LH side) is not damaged.

    OK:
    The lock button is not disengaged, and the claw of the lock is not deformed or damaged.


NG
REPLACE FLOOR WIRE
OK


3.CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT)


  1. Disconnect the connectors from the center airbag sensor.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1905/74 Short In Front Pretensioner Squib Lh Circuit

  1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    K1-1 (L+) - Body ground
    		Ignition switch ON
    		Below 1 V
    K1-2 (L-) - Body ground
    		Ignition switch ON
    		Below 1 V

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K1-1 (L+) - K1-2 (L-)
    		Always
    		Below 1 Ω

  1. Release the activation prevention mechanism built into connector B (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K1-1 (L+) - K1-2 (L-)
    		Always
    		1 MΩ or higher
    K1-1 (L+) - Body ground
    		Always
    		1 MΩ or higher
    K1-2 (L-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE FLOOR WIRE
OK


4.CHECK CENTER AIRBAG SENSOR


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1905/74 Short In Front Pretensioner Squib Lh Circuit

  1. Connect the connectors to the front seat outer belt LH and the center airbag sensor.

  1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    OK:
    DTC B1905, B1906, B1907 or B1908 is not output.
    HINT:
    Codes other than DTC B1905, B1906, B1907 and B1908 may be output at this time, but they are not related to this check.


NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)