Dtc B1825/56 Short In Side 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 AIRBAG LH (SIDE SQUIB LH)

CHECK FLOOR WIRE (SIDE SQUIB LH CIRCUIT)

CHECK CENTER AIRBAG SENSOR

DTC B1825/56 Short in Side Squib LH Circuit

DTC B1826/56 Open in Side Squib LH Circuit

DTC B1827/56 Short to GND in Side Squib LH Circuit

DTC B1828/56 Short to B+ in Side Squib LH Circuit


DESCRIPTION

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

DTC Code
DTC Detection Condition
Trouble Area
B1825/56
When one of the following conditions is met:
  1. The center airbag sensor receives a line short circuit signal 5 times in the side squib LH circuit during the primary check.
  2. A side squib LH malfunction.
  3. A center airbag sensor malfunction.
  1. Floor wire
  2. Front seat airbag assembly LH (Side squib LH)
  3. Center airbag sensor assembly
B1826/56
When one of the following conditions is met:
  1. The center airbag sensor receives an open circuit signal in the side squib LH circuit for 2 seconds.
  2. A side squib LH malfunction.
  3. A center airbag sensor malfunction.
  1. Floor wire
  2. Front seat airbag assembly LH (Side squib LH)
  3. Center airbag sensor assembly
B1827/56
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to ground signal in the side squib LH circuit for 0.5 seconds.
  2. A side squib LH malfunction.
  3. A center airbag sensor malfunction.
  1. Floor wire
  2. Front seat airbag assembly LH (Side squib LH)
  3. Center airbag sensor assembly
B1828/56
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to B+ signal in the side squib LH circuit for 0.5 seconds.
  2. A side squib LH malfunction.
  3. A center airbag sensor malfunction.
  1. Floor wire
  2. Front seat airbag assembly LH (Side squib LH)
  3. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1825/56 Short In Side 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).
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 AIRBAG LH (SIDE SQUIB LH)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1825/56 Short In Side Squib Lh Circuit

  1. Turn the ignition switch off.

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

  1. Disconnect the connector from the front seat airbag LH.

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

    CAUTION:
    Never connect the tester to the front seat airbag LH (side 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 B1825, B1826, B1827 or B1828 is not output.
    HINT:
    Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.
    Result
    Result
    		Proceed to
    OK (for Manual Seat)
    		A
    OK (for Power Seat)
    		B
    NG
    		C


B
REPLACE FRONT SEAT AIRBAG ASSEMBLY LH (Click here)

C
Go to step 2
A

REPLACE FRONT SEAT AIRBAG ASSEMBLY LH (Click here)

2.CHECK FLOOR WIRE (SIDE SQUIB LH CIRCUIT)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1825/56 Short In Side Squib Lh Circuit

  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. Disconnect the connectors from the center airbag sensor.

  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
    Kz4-1 (SFL+) - Body ground
    		Ignition switch ON
    		Below 1 V
    Kz4-2 (SFL-) - 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
    Kz4-1 (SFL+) - Kz4-2 (SFL-)
    		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
    Kz4-1 (SFL+) - Kz4-2 (SFL-)
    		Always
    		1 MΩ or higher
    Kz4-1 (SFL+) - Body ground
    		Always
    		1 MΩ or higher
    Kz4-2 (SFL-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE FLOOR WIRE
OK


3.CHECK CENTER AIRBAG SENSOR


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1825/56 Short In Side Squib Lh Circuit

  1. Connect the connectors to the front seat airbag 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 B1825, B1826, B1827 or B1828 is not output.
    HINT:
    Codes other than DTC B1825, B1826, B1827 and B1828 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)