Airbag control unit with part number 98221SJ101

What does the airbag control unit 98221SJ101 do?

The airbag control unit 98221SJ101 is the central unit of the SRS restraint system of Subaru. It processes signals from the crash sensors, determines the airbags and seatbelt pretensioners to be triggered within milliseconds in a crash, and checks the system continuously. It indicates faults via the airbag warning light.

The crash sensors are distributed throughout the vehicle and send their data to the unit. This data is evaluated before any ignition takes place, so triggering occurs only in an accident.

After an accident, the unit creates crash data and locks itself. This data remains recorded in the unit.

Why does the control unit 98221SJ101 fail?

Most often the cause is crash data left in the memory by an accident, even without a triggered airbag. Diagnostic devices without a special function cannot clear them. Aged electronics, cold solder joints, moisture or corrosion at plugs and voltage spikes also come into play.

The crash data stay in the unit even though the vehicle keeps driving and nothing has visibly changed.

The other triggers relate to the electronics or their connections. A corroded plug can produce fault patterns that resemble a unit defect, which is why the fault memory is important. Voltage spikes arise, for example, from a weak battery or when jump-starting.

How can you tell that the 98221SJ101 is defective?

A defect in the 98221SJ101 shows first through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition, an error message may appear, the diagnostic tool may fail to make contact, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

A warning light of this kind is a clear signal to have the system checked. Only the fault memory shows whether the control unit or a contact is affected.

Which vehicles is the 98221SJ101 fitted in?

The 98221SJ101 is fitted in these vehicles: Subaru Forester SK (2018-2021) and SK Facelift (from 2021).

Here you can see the list of vehicles assigned to it:

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

Compare the part number on the label of the unit with this page in advance. That confirms only whether it is the correct unit. The cause of the fault is shown by the fault memory, because it reveals whether the control unit itself 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 98221SJ101 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the 98221SJ101. Afterwards, create the repair order online and send the unit in, well packed.

At Airbag24, the unit is checked, defective components are replaced, the crash data are deleted and a function test follows. Processing takes usually 3–4 working days, after which your unit is returned 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 98221SJ101 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair, you receive the 98221SJ101 back by UPS. The printed repair order goes into the parcel.

A sturdy packaging with padding material protects the unit in transit.