Airbag control unit with part number A0285014882

What does the airbag control unit A0285014882 do?

The airbag control unit A0285014882 is the central unit of the restraint system (SRS) for Mercedes-Benz. It reads the signals from the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It shows faults via the airbag warning light.

After an accident, the unit stores crash data and locks itself. During normal driving it works unobtrusively in the background and continuously checks its components.

Why does the control unit A0285014882 fail?

The most common cause is crash data stored after an accident, even if no airbag deployed; a normal diagnostic tool cannot erase it. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start, are also possible causes.

The stored crash data remains in the unit, even if nothing can be seen from outside. Airbag24 erases it during repair.

Components age over time, solder joints can stay cold, and moisture attacks plug connections.

How can you tell that the A0285014882 is defective?

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

The light shows the fault as soon as the system detects it. If you see it lit, have the fault checked, even if it lights up only intermittently.

Which vehicles is the A0285014882 fitted in?

The airbag control unit A0285014882 is fitted in these vehicles: Mercedes-Benz A-Class W177 (from 2018). Check before removal whether your vehicle is among them.

The vehicle details for this part number are in the list below.

• Mercedes-Benz A-Class W177 (from 2018)

Compare the part number on the label of the removed unit with this page. This only confirms that you have the correct unit in front of you. Also have the fault memory read out, because only this result shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 0 285 015 019, 0285020871, A 177 900 03 04, A1779000404, A1779002410, A1779005513.

How does the repair of the A0285014882 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit in well packed. Airbag24 tests it on the test bench, corrects the defects in the components, erases the crash data and carries out a function test before the unit is returned to you.

The order of these steps is fixed for safety reasons. At Airbag24, processing usually takes 3–4 working days, and this time covers only testing, repairing and checking the unit. 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 A0285014882 get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shockproof.