Airbag control unit with part number A2229009417

What does the airbag control unit A2229009417 do?

The airbag control unit A2229009417 is the central control unit of the restraint system (SRS) for Mercedes-Benz. It processes the signals from the crash sensors, decides in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

If it detects a fault, it shows this via the airbag warning light in the instrument cluster. The evaluation runs constantly during operation.

After an accident it stores crash data and then locks itself.

Why does the control unit A2229009417 fail?

The most common cause is crash data that remains in the unit after an accident, even if no airbag was triggered. A standard diagnostic tool cannot erase it. Other possible causes are ageing electronics, cold solder joints and moisture at plug connectors.

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump start

Airbag24 erases the crash data as part of the repair.

How can you tell that the A2229009417 is defective?

Typical signs are an airbag warning light in the instrument cluster that stays on permanently or intermittently, a fault message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may fail to trigger in the event of a defect. The warning light in the instrument cluster is therefore the most important sign you can watch for.

Which vehicles is the A2229009417 fitted in?

The control unit A2229009417 is fitted in these vehicles: Mercedes-Benz S-Class W222 Saloon (2013-2020).

The overview lists the vehicles known for this part number.

• Mercedes-Benz S-Class W222 Saloon (2013-2020)

Comparing the part number on the label of the removed unit with this page only ensures that it is the right unit. Having the fault memory read out before you remove it 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 A2229000303, A2229009908, A2229012601, A2229013503, A2229024709.

How does the repair of the A2229009417 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit and create the repair order online. Send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards the unit goes back 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 A2229009417 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 via UPS.

Put the printed repair order in the parcel. Pack the unit shock-resistant.