Airbag control unit with part number 98221FJ400

What does the airbag control unit 98221FJ400 do?

The 98221FJ400 controls the restraint system (SRS) of Subaru. It evaluates the crash sensors and decides in a crash whether airbags and seatbelt pretensioners are triggered. If it detects a fault, it reports this via the airbag warning light.

While driving, the unit works continuously and monitors the system.

After a crash, it stores crash data and locks itself. Only a repair lifts the lock.

Why does the control unit 98221FJ400 fail?

The most common cause is stored crash data that remains in the unit even when no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be detected in the vehicle, yet it remains stored.

The other causes concern the electronics and their connections. Components age, solder joints can go cold, and moisture causes corrosion at plug connections. Voltage spikes arise, for example, from a weak battery or a jump-start.

How can you tell that the 98221FJ400 is defective?

A defect shows itself when the airbag warning light in the instrument cluster comes on permanently or intermittently, or a fault message appears. The diagnostic tool then finds no connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may therefore fail to deploy.

The signs at a glance:

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool receives no connection to the control unit
• fault memory cannot be cleared

The warning light is the clearest of these signs. If you find one, have the system checked promptly.

Which vehicles is the 98221FJ400 fitted in?

The list shows whether your vehicle is a possible match. The 98221FJ400 is fitted in these vehicles: Subaru XV GP (2011-2016) and GP Facelift (2016-2018); Subaru Impreza GJ (2011-2018) and GP (2011-2018).

These vehicles are known for this part number:

• Subaru XV GP (2011-2016)
• Subaru XV GP Facelift (2016-2018)
• Subaru Impreza GJ (2011-2018)
• Subaru Impreza GP (2011-2018)

Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit.

Have the fault memory read out beforehand. This result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 150300-9400, 152300-6130, 1523003971, 98221FE020, 98221FE100, 98221FJ030.

How does the repair of the 98221FJ400 work?

Have the fault memory read out first; the log goes with the unit. Then disconnect the battery and remove the control unit. After that, create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the control unit is checked first, before defective components are replaced and the crash data is cleared. A function test follows, and then 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 98221FJ400 get to Airbag24?

You send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Print out the repair order and put it in the parcel. The unit must be packed shock-proof.