Airbag control unit with part number 98221SJ400

What does the airbag control unit 98221SJ400 do?

The airbag control unit 98221SJ400 controls the restraint system (SRS) for Subaru. Via the crash sensors it measures what happens in an accident and then decides which airbags and seatbelt pretensioners fire. At the same time it monitors all components and reports faults to the airbag warning light.

The function is based on continuous self-testing. As long as everything is in order, the unit remains inconspicuous.

After an accident it stores crash data and locks itself.

Why does the control unit 98221SJ400 fail?

The fault is most often due to crash data from an accident in which the airbag possibly did not fire at all. In addition, ageing components, damaged contacts, moisture in connectors, cold solder joints and voltage spikes can disable the electronics.

Conventional reading tools will not clear this data from memory. The repair at Airbag24 includes removing this data.

The other causes mainly concern the electronics, the connections and the power supply. Which of these applies is shown only by the examination.

How can you tell that the 98221SJ400 is defective?

The airbag warning light in the instrument cluster stays on permanently or flickers intermittently. A fault also shows itself through a fault message in the instrument cluster, a missing connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

This condition means that airbags and seatbelt pretensioners may fail to deploy in an emergency. You recognise the fault by the light.

It is advisable to have the warning checked immediately by a specialist.

Which vehicles is the 98221SJ400 fitted in?

The control unit 98221SJ400 is fitted in these vehicles: Subaru Forester SK (2018-2021) and SK Facelift (from 2021).

The vehicle overview is shown below:

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

If you match the number on the label of the unit with this page, you know that the unit fits. Have the fault memory read out beforehand. The result shows whether the control unit itself is faulty or whether a connector or cable is causing the fault.

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

How does the repair of the 98221SJ400 work?

Have the fault memory read out and enclose the log before you disconnect the battery and remove the control unit. Afterwards create the repair order online and send the unit off well packed. Airbag24 usually needs 3–4 working days for inspection, repair and testing.

Faulty components are replaced, the crash data is erased and a function test is run. You then get your own unit back.

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 98221SJ400 get to Airbag24?

Either you send the unit in as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS. Put the printed repair order in the parcel.

Shock-resistant packaging prevents the unit from being damaged in transit.