Airbag control unit with part number A2229008614

What does the airbag control unit A2229008614 do?

The airbag control unit A2229008614 controls the restraint system (SRS) in Mercedes-Benz vehicles. It evaluates the data from the impact sensors and, in an emergency, determines which airbags and seatbelt pretensioners are triggered; this happens within fractions of a second. After an accident it stores crash data and locks itself.

The control unit monitors the system continuously and reports detected faults via the airbag warning light.

In the background it checks the sensors, the wiring and the firing circuits of the seatbelt pretensioners and airbags.

Why does the control unit A2229008614 fail?

Stored crash data is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase this data. Aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes also play a role.

The crash data sits in the unit's memory. Airbag24 erases it during the repair.

Voltage spikes occur, for example, with a weak battery or a jump start and can stress the electronics.

How can you tell that the A2229008614 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may not be able to deploy.

The light is therefore a clear reason to have the system checked.

Which vehicles is the A2229008614 fitted in?

The control unit A2229008614 is fitted at Mercedes-Benz in these vehicles: Mercedes-Benz S-Class W222 Saloon (2013-2020).

The following list shows the models that Airbag24 has recorded so far.

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

Comparing the part number on the label of the removed unit with this page protects you against sending in the wrong unit. Whether the control unit itself is defective, or whether a plug or cable causes the fault, is shown only by the fault log read out beforehand.

For the same vehicles, we also repair control units with the part numbers A2229000303, A2229009908, A2229012601, A2229013503, A2229024709.

How does the repair of the A2229008614 work?

First the fault memory is read out, and the log goes into the parcel. Then disconnect the battery and only afterwards remove the control unit A2229008614. In the last step, create a repair order online and send the well-packed unit.

Airbag24 examines the unit on the test bench, replaces defective components and erases the stored crash data. A function test follows, and then your own unit goes back.

For checking, repairing and testing at Airbag24, you should expect 3–4 working days as a rule. 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 A2229008614 get to Airbag24?

You send the control unit A2229008614 as a parcel or book a UPS collection for an extra charge. After completion, Airbag24 returns the repaired unit by UPS.

The printed repair order goes into the parcel, and the unit is packed shock-proof.