GSIC - Global Service Information Center

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

for Preparation Click here

DESCRIPTION

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

HINT:

"Front Pretensioner Squib LH" refers to the front passenger side pretensioner squib.

DTC No.	DTC Detection Condition	Trouble Area
B1905/74	When one of following conditions is met: Center airbag sensor assembly receives line short circuit signal 5 times in front passenger side pretensioner squib circuit during primary check Front passenger side pretensioner squib malfunction Center airbag sensor assembly malfunction	Front seat outer belt assembly LH (front passenger side pretensioner squib) Center airbag sensor assembly Floor wire
B1906/74	When one of following conditions is met: Center airbag sensor assembly receives line short circuit signal 5 times in front passenger side pretensioner squib circuit for 2 seconds Front passenger side pretensioner squib malfunction Center airbag sensor assembly malfunction	Front seat outer belt assembly LH (front passenger side pretensioner squib) Center airbag sensor assembly Floor wire
B1907/74	When one of following conditions is met: Center airbag sensor assembly receives short circuit to ground signal in front passenger side pretensioner squib circuit for 0.5 seconds Front passenger side pretensioner squib malfunction Center airbag sensor assembly malfunction	Front seat outer belt assembly LH (front passenger side pretensioner squib) Center airbag sensor assembly Floor wire
B1908/74	When one of following conditions is met: Center airbag sensor assembly receives a short circuit to B+ signal in front passenger side pretensioner squib circuit for 0.5 seconds Front passenger side pretensioner squib malfunction Center airbag sensor assembly malfunction	Front seat outer belt assembly LH (front passenger side pretensioner squib) Center airbag sensor assembly Floor wire

WIRING DIAGRAM

INSPECTION PROCEDURE

1.CHECK FOR DTC

Proceed to each step according to DTC readings.
1. If using the intelligent tester (read the 5 digit DTC):
  Check for DTCs (Click here).
  Result:
  Result
  Proceed to
  DTC B1905 is output
  A
  DTC B1906 is output
  B
  DTC B1907 is output
  C
  DTC B1908 is output
  D
2. If not using the intelligent tester (read the 2 digit DTC):
  Check for DTC (Click here).
  Result:
  Result
  Proceed to
  DTC 74 is output
  E
  HINT:
  DTCs other than DTCs B1905, B1906, B1907, B1908 and 74 may be output at this time, but they are not related to this check.

A

2.CHECK CONNECTOR

Turn the ignition switch OFF.

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

Check that the floor wire connector (on the front seat outer belt LH side) is not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.

REPAIR OR REPLACE NO. 2 FLOOR WIRE

OK

3.CHECK NO. 2 FLOOR WIRE (SHORT)

Disconnect the connectors from the center airbag sensor and front seat outer belt LH.

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

Measure the resistance of the wire harness side connector.
Standard resistance:
Tester connection
Specified condition
F20-1 (L+) - F20-2 (L-)
1 MΩ or higher

Go to step 10

REPAIR OR REPLACE NO. 2 FLOOR WIRE

4.CHECK NO. 2 FLOOR WIRE (OPEN)

Disconnect the connectors from the center airbag sensor and front seat outer belt LH.

Measure the resistance of the wire harness side connector.
Standard resistance:
Tester connection
Specified condition
F20-1 (L+) - F20-2 (L-)
Below 1 Ω

Go to step 11

REPAIR OR REPLACE NO. 2 FLOOR WIRE

5.CHECK NO. 2 FLOOR WIRE (TO GROUND)

Disconnect the connectors from the center airbag sensor and front seat outer belt LH.

Measure the resistance of the wire harness side connector.
Standard resistance:
Tester connection
Specified condition
F20-1 (L+) - Body ground
1 MΩ or higher
F20-2 (L-) - Body ground
1 MΩ or higher

Go to step 11

REPAIR OR REPLACE NO. 2 FLOOR WIRE

6.CHECK NO. 2 FLOOR WIRE (TO B+)

Disconnect the connectors from the center airbag sensor and front passenger side pretensioner squib.

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

Turn the ignition switch ON.

Measure the resistance of the wire harness side connector.
Standard voltage:
Tester connection
Specified condition
F20-1 (L+) - Body ground
Below 1 V
F20-2 (L-) - Body ground
Below 1 V
Before proceeding to the next step, perform the following procedures.
1. Turn the ignition switch OFF.
2. Disconnect the cable from the negative (-) battery terminal and wait for at least 90 seconds.

Go to step 11

REPAIR OR REPLACE NO. 2 FLOOR WIRE

7.CHECK CONNECTOR

Check that the No. 2 floor wire connector (on the front seat outer belt LH side) is not damaged.
OK:
The lock button is not disengaged, or the claw of lock is not deformed or damaged.

REPAIR OR REPLACE NO. 2 FLOOR WIRE

OK

8.CHECK NO. 2 FLOOR WIRE (FRONT PASSENGER SIDE PRETENSIONER SQUIB CIRCUIT)

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

Turn the ignition switch ON.

Measure the voltage of the wire harness side connector.
Standard voltage:
Tester connection
Specified condition
F20-1 (L+) - Body ground
Below 1 V
F20-2 (L-) - Body ground
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 of the wire harness side connector.
Standard resistance:
Tester connection
Specified condition
F20-1 (L+) - F20-2 (L-)
Below 1 Ω
F20-1 (L+) - Body ground
1 MΩ or higher
F20-2 (L-) - Body ground
1 MΩ or higher

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

Measure the resistance of the wire harness side connector.
Standard resistance:
Tester connection
Specified condition
F20-1 (L+) - F20-2 (L-)
1 MΩ or higher

REPAIR OR REPLACE NO. 2 FLOOR WIRE

OK

9.REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PASSENGER SIDE PRETENSIONER SQUIB)

Replace the front seat outer belt LH (Click here).
HINT:
Perform the inspection using parts from a normal vehicle.

Connect the connectors to the center airbag sensor.

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

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

Clear the DTCs stored in memory (Click here).

Turn the ignition switch OFF.

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

Check for DTCs (Click here).
OK:
DTC 74 is not output.
HINT:
DTCs other than DTC 74 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

END

10.CHECK CENTER AIRBAG SENSOR ASSEMBLY

Connect the connectors to the center airbag sensor.

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

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

Clear the DTCs stored in memory (Click here).

Turn the ignition switch OFF.

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

Check for DTCs (Click here).
OK:
DTC B1905 is not output.
HINT:
DTCs other than DTC B1905 may be output at this time, but they are not related to this check.
Before proceeding to the next step, perform the following procedures.
1. Turn the ignition switch OFF.
2. Disconnect the cable from the negative (-) battery terminal and wait for at least 90 seconds.

Go to step 12

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

11.CHECK CENTER AIRBAG SENSOR ASSEMBLY

Connect the connectors to the center airbag sensor.

Using a service wire, connect terminals F21-1 (L+) and F21-2 (L-) of connector C.
NOTICE:
1. Twist the end of the service wire in order to insert it into the connector.
2. Do not forcibly insert the twisted service wire into the terminals of the connector when connecting.

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

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

Clear the DTCs (Click here).

Turn the ignition switch OFF.

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

Check for DTCs (Click here).
OK:
DTC B1906, B1907 or B1908 is not output.
HINT:
DTCs other than DTC B1906, B1907 or B1908 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK

12.CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PASSENGER SIDE PRETENSIONER SQUIB)

Disconnect the service wire from connector C.

Connect the connector to the front seat outer belt LH.

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

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

Clear the DTCs (Click here).

Turn the ignition switch OFF.

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

Check for DTCs (Click here).
OK:
DTC B1905, B1906, B1907 or B1908 is not output.
HINT:
DTCs other than DTC B1905, B1906, B1907 or B1908 may be output at this time, but they are not related to this check.

REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH

USE SIMULATION METHOD TO CHECK

Result	Proceed to
DTC B1905 is output	A
DTC B1906 is output	B
DTC B1907 is output	C
DTC B1908 is output	D

Tester connection	Specified condition
F20-1 (L+) - F20-2 (L-)	1 MΩ or higher

Tester connection	Specified condition
F20-1 (L+) - Body ground	1 MΩ or higher
F20-2 (L-) - Body ground	1 MΩ or higher

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

for Preparation Click here

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE