Airbag control unit with part number 98221FG100

What does the airbag control unit 98221FG100 do?

The airbag control unit 98221FG100 is the central control unit of the restraint system (SRS) in Subaru. It evaluates the signals from the crash sensors and, in the event of an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. After an accident, it stores crash data and locks itself.

The crash sensors continuously send their measured values to the control unit, where they are compared with stored limit values. Triggering only follows if the values match an accident.

During normal operation, the unit monitors the entire system and reports faults via the airbag warning light in the instrument cluster. Because the evaluation runs constantly, the electronics need stable connections to all connected components.

Why does the control unit 98221FG100 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered. A normal diagnostic tool cannot erase this data. Other causes include aging components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

An impact without a triggered airbag can still leave data in the memory, and that is exactly what remains in the unit.

Voltage spikes occur, for example, with a weak battery or a jump start. The other causes develop gradually and cannot be reliably judged from the outside.

How can you tell that the 98221FG100 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. If the diagnostic tool cannot connect to the control unit or the fault memory cannot be cleared, this points to a defect.

In the event of a defect, airbags and seatbelt pretensioners may possibly not trigger in an emergency. Taking the warning seriously means having the cause narrowed down promptly.

The light is the vehicle's own warning signal, and the other signs confirm it.

Which vehicles is the 98221FG100 fitted in?

The airbag control unit 98221FG100 is fitted in these vehicles: Subaru Impreza GH (2007-2014). The list is for orientation only, because the unit can only be reliably matched via the part number on the removed unit.

The overview refers to the part number and not to individual vehicle equipment.

The vehicles at a glance:

• Subaru Impreza GH (2007-2014)

First, you compare the part number on the label of the removed unit with this page; this only ensures that it is the correct unit. Second, you have the fault memory read out beforehand, because only this result shows whether the control unit is defective or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98221FG000, 98221FG040, 98221FG060, 98221FG070.

How does the repair of the 98221FG100 work?

First, you have the fault memory read out and attach the log. Then you disconnect the battery and only then remove the control unit. After that, you create a repair order online and send the unit in, well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Afterwards, your own unit is returned to you.

Processing at Airbag24 usually takes 3–4 working days. This time applies only to checking, repairing and testing at Airbag24.

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 98221FG100 get to Airbag24?

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

Put the printed repair order into the parcel and pack the control unit shockproof.