Supplemental Restraint Systems. Dtc B1905/74 Short In Front Passenger Side Pretensioner Squib Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK VEHICLE TYPE

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

CHECK CONNECTOR

CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT)

CHECK CENTER AIRBAG SENSOR

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

CHECK CONNECTOR

CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB RH CIRCUIT)

CHECK CENTER AIRBAG SENSOR

DTC B1905/74 Short in Front Passenger Side Pretensioner Squib Circuit

DTC B1906/74 Open in Front Passenger Side Pretensioner Squib Circuit

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

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

DESCRIPTION

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

DTC Code	DTC Detection Condition	Trouble Area
B1905/74	One of the following conditions is met: The center airbag sensor detects a line short circuit signal 5 times in the front passenger side pretensioner squib circuit during the primary check. A front passenger side pretensioner squib malfunction. A center airbag sensor malfunction.	Floor wire Front seat outer belt assembly (Front passenger side pretensioner squib) Center airbag sensor assembly
B1906/74	One of the following conditions is met: The center airbag sensor detects open circuit signal in the front passenger side pretensioner squib circuit for 2 seconds. A front passenger side pretensioner squib malfunction. A center airbag sensor malfunction.	Floor wire Front seat outer belt assembly (Front passenger side pretensioner squib) Center airbag sensor assembly
B1907/74	One of the following conditions is met: The center airbag sensor detects a short circuit to ground signal in the front passenger side pretensioner squib circuit for 0.5 seconds. A front passenger side pretensioner squib malfunction. A center airbag sensor malfunction.	Floor wire Front seat outer belt assembly (Front passenger side pretensioner squib) Center airbag sensor assembly
B1908/74	One of the following conditions is met: The center airbag sensor detects a short circuit to B+ signal in the front passenger side pretensioner squib circuit for 0.5 seconds. A front passenger side pretensioner squib malfunction. A center airbag sensor malfunction.	Floor wire Front seat outer belt assembly (Front passenger side pretensioner squib) 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
B1905/74 Short In Front Passenger Side Pretensioner Squib Circuit

INSPECTION PROCEDURE

NOTICE:

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).
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 VEHICLE TYPE

Check vehicle type.
Result
Result
Proceed to
for LHD
A
for RHD
B

Result
Result	Proceed to
for LHD	A
for RHD	B

Go to step 6

B

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

Turn the ignition switch off.

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

Disconnect the connectors from the front seat outer belt LH.

Connect the white 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

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

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

Clear the DTCs (LandCruiser RM000000XFE0NGX.html).

Turn the ignition switch off.

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

Check for DTCs (LandCruiser RM000000XFE0NGX.html).
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.
Result
Result
Proceed to
OK (for 3 Door)
A
OK (for 5 Door)
B
NG
C
Text in Illustration
*1
Front Pretensioner Squib LH
*2
Center Airbag Sensor
*3
Connector C
*4
SST
*a
Front view of wire harness connector
(to Front Pretensioner Squib LH)

Result
Result	Proceed to
OK (for 3 Door)	A
OK (for 5 Door)	B
NG	C

REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH (LandCruiser RM000002LJS053X.html)

REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH (LandCruiser RM000002LJS052X.html)

C

3.CHECK CONNECTOR

Turn the ignition switch off.

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

Disconnect SST from connector C.

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

REPLACE FLOOR WIRE

OK

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

Disconnect the connectors from the center airbag sensor.

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

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
R2-1 (L+) - Body ground
Ignition switch ON
Below 1 V
R2-2 (L-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
R2-1 (L+) - R2-2 (L-)
Always
Below 1 Ω

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

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
R2-1 (L+) - R2-2 (L-)
Always
1 MΩ or higher
R2-1 (L+) - Body ground
Always
1 MΩ or higher
R2-2 (L-) - Body ground
Always
1 MΩ or higher

Text in Illustration
*1	Front Pretensioner Squib LH
*2	Floor Wire
*3	Center Airbag Sensor
*4	Connector C
*a	Front view of wire harness connector (to Front Pretensioner Squib LH)

REPLACE NO. 2 FLOOR WIRE

OK

5.CHECK CENTER AIRBAG SENSOR

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

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

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

Clear the DTCs (LandCruiser RM000000XFE0NGX.html).

Turn the ignition switch off.

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

Check for DTCs (LandCruiser RM000000XFE0NGX.html).
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.
Text in Illustration
*1
Front Pretensioner Squib LH
*2
Center Airbag Sensor

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (LandCruiser RM000003YQB01BX.html)

USE SIMULATION METHOD TO CHECK (LandCruiser RM000000XFD0N3X.html)

6.CHECK FRONT SEAT OUTER BELT RH (FRONT PRETENSIONER SQUIB RH)

Turn the ignition switch off.

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

Disconnect the connectors from the front seat outer belt RH.

Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
CAUTION:
Never connect the tester to the front seat outer belt RH (front pretensioner squib RH) 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

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

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

Clear the DTCs (LandCruiser RM000000XFE0NGX.html).

Turn the ignition switch off.

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

Check for DTCs (LandCruiser RM000000XFE0NGX.html).
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.
Result
Result
Proceed to
OK (for 3 Door)
A
OK (for 5 Door)
B
NG
C
Text in Illustration
*1
Front Pretensioner Squib RH
*2
Center Airbag Sensor
*3
Connector C
*4
SST
*a
Front view of wire harness connector
(to Front Pretensioner Squib RH)

Result
Result	Proceed to
OK (for 3 Door)	A
OK (for 5 Door)	B
NG	C

REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH (LandCruiser RM000002LJS053X.html)

REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH (LandCruiser RM000002LJS052X.html)

C

7.CHECK CONNECTOR

Turn the ignition switch off.

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

Disconnect SST from connector C.

Check that the Floor wire connector (on the front seat outer belt RH side) is not damaged.
OK:
The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
Text in Illustration
*1
Front Pretensioner Squib RH
*2
Center Airbag Sensor

REPLACE FLOOR WIRE

OK

8.CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB RH CIRCUIT)

Disconnect the connectors from the center airbag sensor.

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

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
Q2-1 (R+) - Body ground
Ignition switch ON
Below 1 V
Q2-2 (R-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
Q2-1 (R+) - Q2-2 (R-)
Always
Below 1 Ω

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

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
Q2-1 (R+) - Q2-2 (R-)
Always
1 MΩ or higher
Q2-1 (R+) - Body ground
Always
1 MΩ or higher
Q2-2 (R-) - Body ground
Always
1 MΩ or higher

Text in Illustration
*1	Front Pretensioner Squib RH
*2	Floor Wire
*3	Center Airbag Sensor
*4	Connector C
*a	Front view of wire harness connector (to Front Pretensioner Squib RH)

REPLACE FLOOR WIRE

OK

9.CHECK CENTER AIRBAG SENSOR

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

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

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

Clear the DTCs stored in the memory (LandCruiser RM000000XFE0NGX.html).

Turn the ignition switch off.

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

Check for DTCs (LandCruiser RM000000XFE0NGX.html).
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.
Text in Illustration
*1
Front Pretensioner Squib RH
*2
Center Airbag Sensor

REPLACE CENTER AIRBAG SENSOR (LandCruiser RM000003YQB01BX.html)

USE SIMULATION METHOD TO CHECK (LandCruiser RM000000XFD0N3X.html)

Tester Connection	Switch Condition	Specified Condition
R2-1 (L+) - Body ground	Ignition switch ON	Below 1 V
R2-2 (L-) - Body ground	Ignition switch ON	Below 1 V

Tester Connection	Condition	Specified Condition
R2-1 (L+) - R2-2 (L-)	Always	Below 1 Ω