Airbag control unit with part number 98221AN01E

What does the airbag control unit 98221AN01E do?

The airbag control unit 98221AN01E is the central control unit of the restraint system (SRS) at Subaru. It evaluates the signals from the crash sensors, determines within milliseconds in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system permanently. After a crash it stores crash data and locks itself.

Faults in the system are indicated by the airbag warning light in the instrument cluster, so that the driver is aware of the condition. The light is therefore one of the most important indicators in the vehicle.

Triggering follows fixed evaluation rules. Which components are deployed in an impact depends on direction and severity, and the control unit determines this from the measured values.

Why does the control unit 98221AN01E fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Aged components, cold solder joints, moisture, corrosion on connectors and voltage spikes are also possible causes.

Stored crash data is created by the impact within the unit and is only indirectly related to triggering. The unit retains it, and reading it out with a standard tool does not help.

The other causes concern electronics and connections. Components age, solder joints can go cold, and moisture affects the contacts. Voltage spikes, for example from a weak battery or a jump start, put strain on the circuitry.

How can you tell that the 98221AN01E is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and in addition a fault message appears in the instrument cluster. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The warning light comes on as soon as the control unit has detected a fault in the system. This message is not a minor hint but the actual signal of the fault.

If the diagnostic tool has no connection, the fault cannot be narrowed down. In an emergency, airbags and seatbelt pretensioners may possibly not deploy, so it is advisable to clarify the matter promptly.

Which vehicles is the 98221AN01E fitted in?

The airbag control unit 98221AN01E is fitted in these vehicles: Subaru Forester SK Facelift (from 2021) and SK (2018-2021).

The following overview shows which vehicles belong to this part number.

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

Two checks are useful in advance. Comparing the part number on the label of the unit with this page merely confirms that it is the right unit. Having the fault memory read out, on the other hand, shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98221-SJ370, 98221AN00A, 98221AN00D, 98221AN00E, 98221AN01A, 98221AN01D.

How does the repair of the 98221AN01E work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, and only after that remove the control unit. Next create a repair order online and send in the unit.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The unit then goes back to you. Processing at Airbag24 usually takes 3–4 working days.

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 98221AN01E get to Airbag24?

You send the unit as a parcel to Airbag24, or you arrange a UPS collection for an extra charge. After repair, Airbag24 sends the repaired unit back to you by UPS.

Include the printed repair order with the parcel and pack the control unit so that it is shock-resistant.