GSIC - Global Service Information Center

DTC B1900/73 Short in Front Pretensioner Squib RH Circuit
DTC B1901/73 Open in Front Pretensioner Squib RH Circuit
DTC B1902/73 Short to GND in Front Pretensioner Squib RH Circuit
DTC B1903/73 Short to B+ in Front Pretensioner Squib RH Circuit

for Preparation Click here

DESCRIPTION

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

HINT:

"Front Pretensioner Squib RH" refers to the driver side pretensioner squib.

DTC No.	DTC Detection Condition	Trouble Area
B1900/73	When one of following conditions is met: Center airbag sensor assembly receives line short circuit signal 5 times in driver side pretensioner squib circuit during primary check Driver side pretensioner squib malfunction Center airbag sensor assembly malfunction	Front seat outer belt assembly RH (driver side pretensioner squib) Center airbag sensor assembly Floor wire
B1901/73	When one of following conditions is met: Center airbag sensor assembly receives open circuit signal in driver side pretensioner squib circuit for 2 seconds Driver side pretensioner squib malfunction Center airbag sensor assembly malfunction	Front seat outer belt assembly RH (driver side pretensioner squib) Center airbag sensor assembly Floor wire
B1902/73	When one of following conditions is met: Center airbag sensor assembly receives short circuit to ground signal in driver side pretensioner squib circuit for 0.5 seconds Driver side pretensioner squib malfunction Center airbag sensor assembly malfunction	Front seat outer belt assembly RH (driver side pretensioner squib) Center airbag sensor assembly Floor wire
B1903/73	When one of following conditions is met: Center airbag sensor assembly receives short circuit to B+ signal in driver side pretensioner squib circuit for 0.5 seconds Driver side pretensioner squib malfunction Center airbag sensor assembly malfunction	Front seat outer belt assembly RH (driver 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 B1900 is output
  A
  DTC B1901 is output
  B
  DTC B1902 is output
  C
  DTC B1903 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 73 is output
  E
  HINT:
  DTCs other than DTCs B1900, B1901, B1902, B1903 and 73 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 RH 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 FLOOR WIRE

OK

3.CHECK FLOOR WIRE (SHORT)

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

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
F21-1 (R+) - F21-2 (R-)
1 MΩ or higher

Go to step 10

REPAIR OR REPLACE FLOOR WIRE

4.CHECK FLOOR WIRE (OPEN)

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

Measure the resistance of the wire harness side connector.
Standard resistance:
Tester Connection
Specified Condition
F21-1 (R+) - F21-2 (R-)
Below 1 Ω

Go to step 11

REPAIR OR REPLACE FLOOR WIRE

5.CHECK FLOOR WIRE (TO GROUND)

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

Measure the resistance of the wire harness side connector.
Standard resistance:
Tester Connection
Specified Condition
F21-1 (R+) - Body ground
1 MΩ or higher
F21-2 (R-) - Body ground
1 MΩ or higher

Go to step 11

REPAIR OR REPLACE FLOOR WIRE

6.CHECK FLOOR WIRE (TO B+)

Disconnect the connectors from the center airbag sensor and driver 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 voltage of the wire harness side connector.
Standard voltage:
Tester Connection
Specified Condition
F21-1 (R+) - Body ground
Below 1 V
F21-2 (R-) - 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 FLOOR WIRE

7.CHECK CONNECTOR

Check that the floor wire connector (on the front seat outer belt assembly RH 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 FLOOR WIRE

OK

8.CHECK FLOOR WIRE (DRIVER 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
F21-1 (R+) - Body ground
Below 1 V
F21-2 (R-) - 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
F21-1 (R+) - F21-2 (R-)
Below 1 Ω
F21-1 (R+) - Body ground
1 MΩ or higher
F21-2 (R-) - 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
F21-1 (R+) - F21-2 (R-)
1 MΩ or higher

REPAIR OR REPLACE FLOOR WIRE

OK

9.REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH (DRIVER SIDE PRETENSIONER SQUIB)

Replace the front seat outer belt RH (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 73 is not output.
HINT:
DTCs other than DTC 73 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 B1900 is not output.
HINT:
DTCs other than DTC B1900 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 (R+) and F21-2 (R-) 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.

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 B1901, B1902 or B1903 is not output.
HINT:
DTCs other than DTC B1901, B1902 or B1903 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 RH (DRIVER SIDE PRETENSIONER SQUIB)

Disconnect the service wire from connector C.

Connect the connector to the front seat outer belt RH.

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 B1900, B1901, B1902 or B1903 is not output.
HINT:
DTCs other than DTC B1900, B1901, B1902 or B1903 may be output at this time, but they are not related to this check.

REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH

USE SIMULATION METHOD TO CHECK

Result	Proceed to
DTC B1900 is output	A
DTC B1901 is output	B
DTC B1902 is output	C
DTC B1903 is output	D

Tester Connection	Specified Condition
F21-1 (R+) - F21-2 (R-)	1 MΩ or higher

Tester Connection	Specified Condition
F21-1 (R+) - Body ground	1 MΩ or higher
F21-2 (R-) - Body ground	1 MΩ or higher

DTC B1900/73 Short in Front Pretensioner Squib RH Circuit

DTC B1901/73 Open in Front Pretensioner Squib RH Circuit

DTC B1902/73 Short to GND in Front Pretensioner Squib RH Circuit

DTC B1903/73 Short to B+ in Front Pretensioner Squib RH Circuit

for Preparation Click here

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE