Airbag control unit with part number A0285011849

What does the airbag control unit A0285011849 do?

The airbag control unit A0285011849 is the controller of the restraint system (SRS) in Mercedes-Benz. It processes the measured values from the crash sensors, triggers the appropriate airbags and seatbelt pretensioners in an accident, and monitors the system continuously. After an accident it stores crash data and locks itself.

The fault memory records faults that the unit detects.

In normal operation the system stays unobtrusive, because the unit continuously checks sensors and wiring.

Why does the control unit A0285011849 fail?

Crash data from an earlier accident is the most common cause with the A0285011849, even if no airbag was triggered in it. A normal diagnostic tool cannot erase it. Other causes include aged electronics, cold solder joints, moisture at connectors and voltage spikes.

Airbag24 erases crash data during the repair. The other possible causes in detail:

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

How can you tell that the A0285011849 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and an error message also appears in the instrument cluster on the A0285011849. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The warning light is the clearest indication that the system is not working properly.

In that case, the airbags and seatbelt pretensioners may not trigger in an emergency for as long as the fault persists.

Which vehicles is the A0285011849 fitted in?

The A0285011849 unit is fitted in these Mercedes-Benz vehicles: Mercedes-Benz Vito W639 (2003-2014); Mercedes-Benz Sprinter W906 (2006-2018); Mercedes-Benz Viano W639 (2003-2014); Mercedes-Benz V-Class W639 (2003-2014).

The list reflects the assignment stored for this number.

• Mercedes-Benz Vito W639 (2003-2014)
• Mercedes-Benz Sprinter W906 (2006-2018)
• Mercedes-Benz Viano W639 (2003-2014)
• Mercedes-Benz V-Class W639 (2003-2014)

Compare the part number on the label of the unit with this page. That only confirms that you have the right unit in front of you. Have the fault memory read out in advance, because only its result shows whether the control unit is defective or whether a connector or cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 0285010349, 0285011060, 285001448, 285001449, 285010033, 285010054.

How does the repair of the A0285011849 work?

First, have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit A0285011849. Afterwards, create a repair order online and pack the unit well. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards your own unit is returned 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 A0285011849 get to Airbag24?

You send the control unit A0285011849 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends it back by UPS after the repair.

The printed repair order goes into the parcel, along with shock-resistant packaging for the unit.