Airbag control unit with part number A2229008714

What does the airbag control unit A2229008714 do?

The airbag control unit A2229008714 is the central unit of the SRS restraint system in Mercedes-Benz. It checks the signals from the crash sensors, and in an accident it decides within milliseconds on the triggering of airbags and seatbelt pretensioners. After an accident, it secures crash data and then locks itself.

Monitoring runs continuously in the background. If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster.

Why does the control unit A2229008714 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes such as from a weak battery or a jump start can also come into play.

A normal diagnostic tool cannot remove these entries. The other triggers are related to ageing and environmental influences, such as moisture in the plug.

Airbag24 erases the crash data during the repair.

How can you tell that the A2229008714 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently if the A2229008714 is defective. In addition, there is a fault message in the instrument cluster, no connection from the diagnostic tool to the control unit, and a fault memory that cannot be cleared.

Take this warning signal seriously. In an emergency, airbags and seatbelt pretensioners may not trigger when the system is faulty.

Which vehicles is the A2229008714 fitted in?

The airbag control unit A2229008714 is fitted in these vehicles: Mercedes-Benz S-Class W222 Saloon (2013-2020). A comparison with the list quickly shows whether your vehicle is affected.

The vehicles in detail:

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

Compare the part number on the label of the removed unit with this page. This only shows that you have the right unit. Have the fault memory read out beforehand, because only that shows whether the control unit is defective or whether a connector 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 A2229008714 work?

First, read out the fault memory and attach the log. Then disconnect the battery; only after that remove the control unit A2229008714. Next, create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench and replaces defective components. The team then erases the crash data and carries out a function test before your own unit is returned 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 A2229008714 get to Airbag24?

You can either send the control unit A2229008714 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Pack the unit so that it is shock-resistant and place the printed repair order in the parcel.