Airbag control unit with part number 98221SJ230

What does the airbag control unit 98221SJ230 do?

The airbag control unit 98221SJ230 is the central control unit of the restraint system in Subaru. It receives the signals from the crash sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

The system reports faults via the airbag warning light, which sits in the instrument cluster. The light therefore gives the driver the indication of a fault.

Monitoring takes place without interruption, and the evaluation runs directly in the unit.

Why does the control unit 98221SJ230 fail?

The most common cause at the 98221SJ230 is the stored crash data after an accident, even without a triggered airbag; they cannot be cleared with a normal diagnostic tool. In addition, ageing electronics, cold solder joints, moisture and corrosion, and voltage spikes are possible causes.

The crash data are part of the memory, and they are only erased during the repair at Airbag24. The other causes cannot always be reliably assessed from outside.

Further causes at a glance:

• electronics that weaken with increasing age
• solder joints that are poorly connected
• moisture and rust at plug connections
• voltage spikes, for example with a weak battery or a jump start

How can you tell that the 98221SJ230 is defective?

The airbag warning light in the instrument cluster burns continuously or intermittently, an error message appears in the instrument cluster, and the diagnostic tool does not find the 98221SJ230. Alternatively the fault memory remains. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

These signs in detail:

• Airbag warning light burns continuously or intermittently
• Error message in the instrument cluster
• Diagnostic tool cannot establish a connection to the control unit
• Fault memory cannot be cleared

A sign like this should be checked promptly, so that you know where you stand.

Which vehicles is the 98221SJ230 fitted in?

Installed, the 98221SJ230 is found in these vehicles: Subaru Forester SK (2018-2021) and SK Facelift (from 2021).

An assignment exists for this control unit, which you will see directly as a list:

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

Comparing the part number on the removed unit with this page shows that you have the correct unit. It does not show the condition of the control unit. Therefore have the fault memory read out before removal; the log establishes whether the control unit or a plug or cable is affected.

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

How does the repair of the 98221SJ230 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery and remove the 98221SJ230. Afterwards create the repair order online and send the unit well packed. At Airbag24, testing, repairing and function testing generally take 3–4 working days.

Battery disconnected first, then removal: this sequence protects you when handling the airbag system.

At Airbag24 the unit is examined on the test bench. Defective components are replaced there, the crash data are erased and a function test is carried out. Then your own unit 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 98221SJ230 get to Airbag24?

You send the 98221SJ230 as a parcel or book a UPS collection for an extra charge. After the repair, UPS brings it back.

Enclose the printed repair order with the parcel. Pack the control unit shock-proof.