Before Starting Troubleshooting

Even if any part is to be replaced as the result of diagnosis, do not use airbag parts or pretensioner parts from other vehicles. Always replace the defective parts with new parts.
When checking the airbag system, be sure to use a digital circuit tester. Use of an analog circuit tester may cause the airbag to activate erroneously due to a minimal current inside tester.

Fig 1: Identifying Digital Circuit Tester (Proper And Improper)
Courtesy of SUBARU OF AMERICA, INC.
Do not allow water or oil to come in contact with the connector terminals. Also, do not touch the connector terminals directly.

Fig 2: Caution For Touching Connector Terminals
Courtesy of SUBARU OF AMERICA, INC.
When checking, use a test harness (1). Damage to connector terminal cause malfunction. Do not directly apply the tester probe to connector terminal of airbag.

Fig 3: Caution For Applying Tester Probe To Connector Terminal Of Airbag
Courtesy of SUBARU OF AMERICA, INC.
Do not check continuity of the airbag modules for driver's side, passenger's side and curtain, or the pretensioner.

Fig 4: Caution For Check Continuity Of Airbag Modules For Driver'S Side, Passenger's Side And Curtain, Or Pretensioner
Courtesy of SUBARU OF AMERICA, INC.
If damage, open circuit or rust is found on airbag system wiring harness, do not repair the harness. Always replace the faulty harness with a new genuine part.

Fig 5: Caution For Repairing Airbag System Wiring Harness
Courtesy of SUBARU OF AMERICA, INC.