Airbag control unit with part number 98221AN031

What does the airbag control unit 98221AN031 do?

In Subaru, the airbag control unit 98221AN031 is the control unit of the restraint system (SRS). It evaluates signals from the crash sensors, decides on airbags and seatbelt pretensioners within milliseconds in an emergency, and monitors the entire system continuously. It indicates faults via the airbag warning light.

In the background it checks sensors, wiring and the power supply and notes irregularities. This keeps deviations traceable, even if they hardly stand out in everyday use.

After an accident it records crash data and then locks itself. Only the repair lifts this lock.

Why does the control unit 98221AN031 fail?

The most common cause is crash data stored after an accident, even without a triggered airbag. Further causes are ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

• ageing of the electronic components
• solder joints that have gone cold
• moisture causing corrosion at plug connections
• voltage spikes, for example from a weak battery or from connecting a jump start

A normal diagnostic tool cannot erase crash data. The other causes belong to the condition of the electronics and their connections.

How can you tell that the 98221AN031 is defective?

The airbag warning light in the instrument cluster lights up continuously or intermittently. In addition the instrument cluster shows an error message, the diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared.

With these signs, airbags and seatbelt pretensioners may in an emergency not trigger. Such a finding requires attention, and the warning light must not be overlooked. It shows the state of the system directly in your field of view.

Which vehicles is the 98221AN031 fitted in?

The 98221AN031 was fitted in these vehicles: Subaru Forester SK (2018-2021) and SK Facelift (from 2021).

The vehicles in detail:

• Subaru Forester SK (2018-2021)
• Subaru Forester SK Facelift (from 2021)

On the one hand, a comparison of the part number on the label with this page is enough to make sure that the right unit is at hand. On the other hand, have the fault memory read before removal. Only this result shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 1523004370, 98221FC210, 98221SJ000, 98221SJ001.

How does the repair of the 98221AN031 work?

First have the fault memory read and attach the log. Then disconnect the battery, remove the control unit and create a repair order online. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

Airbag24 checks the unit, replaces defective components, erases the crash data and carries out a function test. The unit is then sent back to you.

Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit 98221AN031 get to Airbag24?

You can send the unit as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Print the repair order and enclose it with the unit, which you pack shock-resistant.