DTC B19F7: Short In Front P/T 2 LH (To + B)

Diagnosis start condition:

When the ignition voltage is 10 - 16 V.

DTC detecting condition:

Lap seat belt pretensioner harness LH circuit is shorted to power supply.
Lap seat belt pretensioner LH 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.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to AIRBAG (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

CHECK POOR CONTACT OF CONNECTORS .
Check for poor contact of the connectors between the airbag control module and the lap seat belt pretensioner LH.

Is there poor contact?

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

No : Go to 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 (AB96) from lap seat belt pretensioner LH.
3. Connect the connector (1N) in the test harness N to the connector (AB96).
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 .
Does the airbag warning light illuminate for six seconds and go off?

Yes : Replace the lap seat belt pretensioner LH. Ref. to SEAT BELT SYSTEM>FRONT SEAT BELT .

No : Go to 3 .
CHECK AIRBAG REAR HARNESS (LAP SEAT BELT PRETENSIONER HARNESS LH) (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 (AB94) from seat belt pretensioner LH.
4. Disconnect the connector (AB98) from the adaptive force limiter LH.
5. Disconnect the connector (AB100) from rear seat belt pretensioner LH.
6. Disconnect the connector (AB92) from curtain airbag module LH.
7. Disconnect the connector (AB88) from side airbag module LH.
8. Disconnect the connectors (AB41, AB42, AB43) from airbag control module.
9. Connect the connector (1BF) in the test harness BF to the connectors (AB41, AB42, AB43).
10. Install the ground terminal to the battery sensor and turn the ignition switch to ON. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
11. Measure the voltage between connector (7BF) in the test harness BF and chassis ground.
  Connector and terminal
  
  (7BF) No. 10 (+) - Chassis ground (-):
  
  (7BF) No. 16 (+) - Chassis ground (-):
Is the voltage less than 1 V?

Yes : Go to 4 .

No : Replace the airbag rear harness along with body harness.
CHECK AIRBAG CONTROL MODULE .
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 test harness BF from the connectors (AB41, AB42, AB43).
3. Connect all connectors.
4. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
5. Execute the inspection mode. Ref. to AIRBAG (DIAGNOSTICS)>INSPECTION MODE .
6. Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B19F7 displayed? (Current malfunction)

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

No : Go to 5 .
CHECK FOR ANY OTHER DTC ON DISPLAY .
Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is any other DTC displayed?

Yes : Perform the diagnosis for other displayed DTCs. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

No : Finish the diagnosis.