Dtc B1825/56 Short In Side Squib Lh Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FRONT SEAT AIRBAG ASSEMBLY LH (SIDE SQUIB LH)

CHECK NO. 2 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 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
One of the following conditions is met:
  1. The center airbag sensor detects 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. No. 2 floor wire
  2. Front seat airbag assembly LH (Side squib LH)
  3. Center airbag sensor assembly
B1826/56
One of the following conditions is met:
  1. The center airbag sensor detects 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. No. 2 floor wire
  2. Front seat airbag assembly LH (Side squib LH)
  3. Center airbag sensor assembly
B1827/56
One of the following conditions is met:
  1. The center airbag sensor detects 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. No. 2 floor wire
  2. Front seat airbag assembly LH (Side squib LH)
  3. Center airbag sensor assembly
B1828/56
One of the following conditions is met:
  1. The center airbag sensor detects 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. No. 2 floor wire
  2. Front seat airbag assembly LH (Side squib LH)
  3. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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 (LandCruiser RM000003YMD00TX.html).
  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).
HINT:
To perform the simulation method, enter check mode (signal check) with the intelligent tester (LandCruiser RM000000XFF0H0X.html), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (LandCruiser RM000000XFD0N3X.html).
1.CHECK FRONT SEAT AIRBAG ASSEMBLY LH (SIDE SQUIB LH)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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 (LandCruiser RM000000XFE0NGX.html).

  1. Turn the ignition switch off.

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

  1. Check for DTCs (LandCruiser RM000000XFE0NGX.html).

    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.
    Text in Illustration
    *1
    		Side Squib LH
    *2
    		Center Airbag Sensor
    *3
    		Connector C
    *4
    		SST
    *a
    		Front view of wire harness connector
    (to Side Squib LH)
    *b
    		Color: Red


NG
Go to step 2
OK

REPLACE FRONT SEAT AIRBAG ASSEMBLY LH (LandCruiser RM00000465Z017X.html)

2.CHECK NO. 2 FLOOR WIRE (SIDE SQUIB LH CIRCUIT)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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
    R6-1 (SFL+) - Body ground
    		Ignition switch ON
    		Below 1 V
    R6-2 (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
    R6-1 (SFL+) - R6-2 (SFL-)
    		Always
    		Below 1 Ω

  1. Release the activation prevention mechanism built into connector B (LandCruiser RM000000XFD0N3X.html).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R6-1 (SFL+) - R6-2 (SFL-)
    		Always
    		1 MΩ or higher
    R6-1 (SFL+) - Body ground
    		Always
    		1 MΩ or higher
    R6-2 (SFL-) - Body ground
    		Always
    		1 MΩ or higher
Text in Illustration
*1
Side Squib LH
*2
No. 2 Floor Wire
*3
Center Airbag Sensor
*4
Connector C
*a
Front view of wire harness connector
(to Side Squib LH)


NG
REPLACE NO. 2 FLOOR WIRE
OK


3.CHECK CENTER AIRBAG SENSOR


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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 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 (LandCruiser RM000000XFE0NGX.html).

  1. Turn the ignition switch off.

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

  1. Check for DTCs (LandCruiser RM000000XFE0NGX.html).

    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.
    Text in Illustration
    *1
    		Side Squib LH
    *2
    		Center Airbag Sensor


NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (LandCruiser RM000003YQB01BX.html)
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000000XFD0N3X.html)