Airbag control unit with part number 98221SA090

What does the airbag control unit 98221SA090 do?

The airbag control unit 98221SA090 is the central control unit of the restraint system (SRS) of Subaru. It processes the signals from the crash sensors, decides in a crash within milliseconds on triggering airbags and seatbelt pretensioners, and monitors the system continuously. It reports faults via the airbag warning light.

The crash sensors supply the measurements on which the control unit bases its decision. In everyday driving you notice nothing of this as long as the system works without faults.

After an accident the control unit stores crash data and locks itself.

Why does the control unit 98221SA090 fail?

The most common cause: crash data stored after an accident, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, as well as voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 erases it during the repair.

The other causes in detail are:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 98221SA090 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, and the diagnostic tool finds no connection to the control unit. If the fault memory also cannot be cleared, this too points to a problem. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The warning light shows the defect itself, and measurements are not needed for that. If you notice any of these signs, have the restraint system checked promptly.

Which vehicles is the 98221SA090 fitted in?

The control unit 98221SA090 is fitted in these vehicles: Subaru Forester SG (2002-2005) and SG Facelift (2005-2008). The overview helps you match it to your car.

Here is the list in detail:

• Subaru Forester SG (2002-2005)
• Subaru Forester SG Facelift (2005-2008)

Start by comparing the part number on the label of the removed unit with this page. That only ensures that it is the right unit. Also have the fault memory read out beforehand, because 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 98221SA030, 98221SA031, 98221SA080, 98221SA210.

How does the repair of the 98221SA090 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Then create a repair order online and send in the well-packed unit. Airbag24 tests it on the test bench, repairs defective components, erases stored crash data and carries out a function test, after which you receive your own unit back.

This sequence is mandatory for safety reasons. The control unit may only be removed once the battery has been disconnected.

Processing at Airbag24 usually takes 3–4 working days.

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 98221SA090 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair your unit comes back to you from Airbag24 by UPS.

Put the printed repair order in the parcel and pack the control unit shock-proof.