DTC B1823: Short In Side Airbag RH (To +B)

Diagnosis start condition:

When the ignition voltage is 10 - 16 V.

DTC detecting condition:

Side airbag harness RH is shorted to power supply.
Side airbag module 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.

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 side airbag module RH.

Is there poor contact?

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

No: Go to 2.
CHECK AIRBAG REAR HARNESS (SIDE AIRBAG MODULE 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 connector (AB26) from Seatbelt pretensioner and adaptive force limiter RH.
3. Disconnect the connector (AB30) from the lap seat belt pretensioner RH.
4. Disconnect the connector (AB68) from Second-row seatbelt pretensioner RH.
5. Disconnect the connector (AB33) from curtain airbag module RH.
6. Disconnect the connector (AB24) from side airbag module RH.
7. Disconnect the connectors (AB6, AB17, AB18) from airbag control module.
8. Install the ground terminal to the battery sensor and turn the ignition switch to ON. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
9. Measure the voltage between connector (AB24) of side airbag module RH and chassis ground.
  CAUTION: Connect the test harness AT terminal to the connector (AB24) terminal and contact a tester to the test harness AT.
  
  Connector & terminal
  
  (AB24) No. 1 (+) - Chassis ground (-):
  
  (AB24) No. 2 (+) - Chassis ground (-):
Is the voltage less than 1 V?

Yes: Go to 3.

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. Connect all connectors other than side airbag module RH connector (AB24).
3. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (diag)>CLEAR MEMORY .
4. Execute the inspection mode. Ref. to AIRBAG (DIAGNOSTICS)>INSPECTION MODE .
5. Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .
Is DTC B1823 displayed? (Current malfunction)

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

No: Go to 4.
CHECK SIDE AIRBAG 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. Connect all connectors.
3. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (diag)>CLEAR MEMORY .
4. Execute the inspection mode. Ref. to AIRBAG (DIAGNOSTICS)>INSPECTION MODE .
5. Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .
Is DTC B1823 displayed? (Current malfunction)

Yes: Replace the side airbag module RH. Ref. to AIRBAG SYSTEM>Side Airbag Module>REMOVAL .

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? (Current malfunction)

Yes: Perform the diagnosis for other displayed DTCs. Ref. to AIRBAG (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST .

No: Finish the diagnosis.