Airbag control unit with part number 98221SG090

What does the airbag control unit 98221SG090 do?

The airbag control unit 98221SG090 is the central control of the restraint system (SRS) in Subaru. It processes measurements from the crash sensors and, in an accident, selects within milliseconds the airbags and seatbelt pretensioners that are triggered.

The unit monitors the system without a break. It shows any detected fault via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself. A repair is the only way to lift this lock again.

Why does the control unit 98221SG090 fail?

The most common cause is crash data from an accident, even without a deployed airbag. A normal diagnostic tool cannot erase it. Further causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is created when the control unit registers an accident event. An airbag does not have to have been deployed for this. The entries remain in memory until Airbag24 removes them during the repair.

The other causes are based on ageing and environmental influences. Electronics age, solder joints can become weak spots, and moisture and corrosion attack plug connections. Voltage spikes, for example from a weak battery or a jump start, add further strain.

How can you tell that the 98221SG090 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. A fault message also appears, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

It is better not to wait on the light, because in an emergency the airbags and seatbelt pretensioners may not be able to deploy. The signal is unambiguous and calls for a prompt response.

A missing diagnostic connection is not without consequence either. It points to a finding that must be examined more closely.

Which vehicles is the 98221SG090 fitted in?

The control unit 98221SG090 is fitted in these vehicles: Subaru Forester SJ (2012-2016) and SJ Facelift (2016-2019). With this listing you can check before removal whether the unit fits the car.

The list of vehicles appears directly below.

• Subaru Forester SJ (2012-2016)
• Subaru Forester SJ Facelift (2016-2019)

Compare the part number on the label of the removed unit with this page. This shows that it is the correct unit, but nothing more. Also have the fault memory read out, because only this result shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98221-SJ370, 98221SG250, 98221SJ001.

How does the repair of the 98221SG090 work?

First have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Then create a repair order online and pack the unit well before you send it.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Your own unit then goes 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 98221SG090 get to Airbag24?

You send the control unit 98221SG090 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order in the parcel and pack the unit shockproof.