Airbag control unit with part number 98221CC040

What does the airbag control unit 98221CC040 do?

The airbag control unit 98221CC040 is the central control unit of the restraint system (SRS) on Subaru. It analyses the signals from the crash sensors and, in a crash, decides within fractions of a second which airbags and seatbelt pretensioners are triggered.

It also monitors the system continuously. It shows faults via the airbag warning light in the instrument cluster.

After a crash, the unit stores crash data and locks itself. The further sections of this page explain what this means for the repair.

Why does the control unit 98221CC040 fail?

Most often this is caused by crash data stored after a crash, even if no airbag has triggered. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A normal diagnostic tool cannot erase this crash data. The other causes affect the electronics themselves and the connections to them.

• aged electronic components
• cold solder joints on the circuit board
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the 98221CC040 is defective?

The airbag warning light in the instrument cluster stays on permanently or lights up only intermittently. A fault message appears in the instrument cluster, and the diagnostic tool finds no connection to the control unit. In addition, the fault memory cannot be cleared; in an emergency, airbags and seatbelt pretensioners may then not trigger.

The warning light in particular gives the clearest sign that something is wrong in the system. If it stays on after switching on the ignition, or comes back later, it is worth having the fault memory read out.

Even if the vehicle still drives normally, the warning should not be regarded as harmless, because the protective function cannot be relied upon in an emergency.

Which vehicles is the 98221CC040 fitted in?

The airbag control unit 98221CC040 is fitted in these vehicles: Subaru BRZ ZD8 (from 2021).

For this part number, we assign the following vehicles:

• Subaru BRZ ZD8 (from 2021)

Compare the part number on the label of the removed unit with this page. The comparison only confirms that you have the right unit. Have the fault memory read out beforehand. Only this result shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98221CC001, 98221CC120.

How does the repair of the 98221CC040 work?

First have the fault memory read out, then disconnect the battery and only then remove the control unit. Afterwards, create a repair order online and send in the unit. Airbag24 checks it, replaces defective components, erases stored crash data and carries out a function test; processing usually takes 3–4 working days.

This sequence is for safety reasons and is therefore binding. Enclose the readout log with the unit.

After the function test, your own 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 98221CC040 get to Airbag24?

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

Place the printed repair order in the parcel and pack the unit shock-proof.