DTC B1806: Open In Passenger's Airbag

Diagnosis start condition: 

When the ignition voltage is 10 - 16 V.

DTC detecting condition: 

• Airbag main harness circuit is open.
• Airbag module harness (passenger's side) circuit is open.
• Passenger's airbag module 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 passenger's airbag module.

   Is there poor contact?

   Yes  : Replace the airbag harness.

   No  : Go to  2.

2. CHECK AIRBAG MAIN HARNESS (PASSENGER'S AIRBAG HARNESS) (OPEN CIRCUIT)  .
   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 (AB46) from the roll connector.
   3. Disconnect the connector (AB86) from the driver's knee airbag module.
   4. Disconnect the connectors (AB41, AB42, AB43) from airbag control module.
   5. Disconnect the connector (AB83) from the passenger's airbag module.
   6. Measure the resistance between terminals of connector (AB83) of passenger's side airbag module.
      CAUTION:

      Connect the test harness AT terminal to the connector (AB83) terminal and contact a tester to the test harness AT. Two sets of test harness AT are required. 

      Connector & terminal 

      (AB83) No. 1 - (AB83) No. 2:

   Is the resistance less than 10 Ω?

   Yes  : Go to  3.

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

3. CHECK AIRBAG CONTROL MODULE  .
   1. Connect the connectors (AB41, AB42, AB43) to the airbag control module.
   2. Connect the connector (AB46) to the roll connector.
   3. Connect the connector (AB86) to the driver's knee airbag module.
   4. Using test harness AT, short the terminals No. 1 and No. 2 of connector (AB83).

      Connector & terminal 

      (AB83) No. 1 - (AB83) No. 2:

   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 B1805 displayed? (Current code)

   Yes  : Replace the passenger's airbag module. Ref. to AIRBAG SYSTEM>PASSENGER'S AIRBAG MODULE>REMOVAL

   No  : Replace the airbag control module. Ref. to AIRBAG SYSTEM>AIRBAG CONTROL MODULE>REMOVAL