DTC B19F3: Short In Front P/T 2 RH (To +B)

Diagnosis start condition: 

When the ignition voltage is 10 - 16 V.

DTC detecting condition: 

• Lap seat belt pretensioner harness RH circuit is shorted to power supply.
• Lap seat belt pretensioner RH is faulty.
• Airbag control module is faulty.

Wiring diagram: 

Airbag system Ref. to WIRING SYSTEM>AIRBAG SYSTEM>WIRING DIAGRAM

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK POOR CONTACT OF CONNECTORS  .

   Check for poor contact of the connectors between the airbag control module and the lap seat belt pretensioner RH.

   Is there poor contact?

   Yes  : Replace the airbag rear harness along with body harness.

   No  : Go to  2.

2. CHECK LAP SEAT BELT PRETENSIONER  .
   1. Turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
   2. Disconnect the connector (AB95) from the lap seat belt pretensioner RH.
   3. Connect the connector (1N) in the test harness N to the connector (AB95).
   4. Connect the airbag resistor to the connector (2N) of test harness N.
   5. Install the ground terminal to the battery sensor and turn the ignition switch to ON. Ref. to REPAIR CONTENTS>NOTE>BATTERY
   6. Execute the inspection mode. Ref. to AIRBAG (DIAGNOSTICS)>INSPECTION MODE 
   7. Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

   Is DTC B19F3 displayed? (Current code)

   Yes  : Go to  3.

   No  : Replace the lap seat belt pretensioner RH. Ref. to SEAT BELT SYSTEM>FRONT SEAT BELT

3. CHECK AIRBAG REAR HARNESS (LAP SEAT BELT PRETENSIONER HARNESS RH) (SHORTED TO POWER SUPPLY)  .
   1. Turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
   2. Disconnect the airbag resistor from the connector (2N) of test harness N.
   3. Disconnect the connector (AB93) from seat belt pretensioner RH.
   4. Disconnect the connector (AB99) from Rear seatbelt pretensioner RH.
   5. Disconnect the connector (AB87) from side airbag module RH.
   6. Disconnect the connector (AB91) from curtain airbag module RH.
   7. Disconnect the connectors (AB41, AB42, AB43) from airbag control module.
   8. Connect the connector (1BF) in the test harness BF to the connectors (AB41, AB42, AB43).
   9. Install the ground terminal to the battery sensor and turn the ignition switch to ON. Ref. to REPAIR CONTENTS>NOTE>BATTERY
   10. Measure the voltage between connector (5BF) in the test harness BF and chassis ground.

       Connector & terminal 

       (5BF) No. 9 (+) - Chassis ground (-):

       (5BF) No. 14 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   Yes  : Replace the airbag control module. Ref. to AIRBAG SYSTEM>AIRBAG CONTROL MODULE>REMOVAL

   No  : Replace the airbag rear harness along with body harness.