Airbag control unit with part number A2229018506

What does the airbag control unit A2229018506 do?

The airbag control unit A2229018506 is the central control unit of the restraint system (SRS) in Mercedes-Benz. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds whether airbags and seatbelt pretensioners are triggered. After an accident, it stores crash data and locks itself.

The control unit monitors the system continuously. It shows faults via the airbag warning light in the instrument cluster.

The lock remains in place until the repair lifts it.

Why does the control unit A2229018506 fail?

In the A2229018506, the most common cause is crash data stored after an accident, even if no airbag was deployed. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a standard diagnostic tool.

Aged electronics and cold solder joints can lead to faults. Moisture and corrosion at plug connections impair the contact.

Voltage spikes arise, for example, from a weak battery or from a jump start.

How can you tell that the A2229018506 is defective?

The airbag warning light in the instrument cluster lights up on the A2229018506 permanently or intermittently. There may also be an error message in the instrument cluster, no connection between the diagnostic tool and the control unit, or a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may not deploy. Have the warning checked promptly.

Which vehicles is the A2229018506 fitted in?

The airbag control unit A2229018506 is fitted in these vehicles: Mercedes-Benz S-Class W222 Saloon (2013-2020).

The vehicles at a glance:

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

(a) Compare the part number on the label of the removed unit with this page; this only confirms that you have the right unit in front of you. (b) Have the fault memory read out beforehand, because only the result 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 A2229018506 work?

For the A2229018506, read out the fault memory and enclose the log. Then disconnect the battery and remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Next, create a repair order online and pack the unit well for shipping.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a functional test. The unit then 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 A2229018506 get to Airbag24?

You send the control unit A2229018506 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Place the printed repair order in the parcel and pack the unit shockproof.