Airbag control unit with part number A906446144260

What does the airbag control unit A906446144260 do?

In a Mercedes-Benz vehicle, the unit numbered A906446144260 controls the restraint system (SRS). It checks the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners fire, and monitors the system continuously. If it reports a fault, the airbag warning light comes on.

In everyday use this work goes unnoticed, because the control unit constantly checks sensors, wiring and triggering circuits in the background. If it detects a deviation, it creates an entry in the fault memory.

After an accident the unit stores crash data and locks itself. Only the repair lifts this lock.

Why does the control unit A906446144260 fail?

Stored crash data is the most common cause for the A906446144260, even if no airbag was triggered in the accident. Further causes are ageing electronic components, dry solder joints, moisture or corrosion at plug connectors, and voltage spikes, for example from a weak battery or a jump start.

A standard diagnostic tool cannot erase this crash data. Airbag24 erases it during the repair.

The other causes develop gradually. Solder joints age, moisture attacks plug connectors, and voltage spikes stress the electronics when the battery is weak or the vehicle is started with a jump start.

How can you tell that the A906446144260 is defective?

The airbag warning light in the instrument cluster indicates a defect in the A906446144260 when it is lit permanently or intermittently. In addition, an error message may appear in the instrument cluster, the diagnostic tool may fail to connect, or the fault memory cannot be erased. In these cases, airbags and seatbelt pretensioners may not trigger in an emergency.

A defect therefore does not stay hidden, because the light reports it actively. Even if the vehicle behaves normally, a fault can be present in the system.

If you notice any of these irregularities, have the vehicle checked promptly before relying on the restraint systems.

Which vehicles is the A906446144260 fitted in?

The control unit A906446144260 is fitted in these 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 details are based on the data we hold for this part number.

Specifically, these vehicles are affected:

• 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)

First, compare the part number on the label of the removed unit with this page; this only confirms that you have the right unit. Also have the fault memory read out in advance, 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 0285010349, 0285011060, 285001448, 285001449, 285010033, 285010054.

How does the repair of the A906446144260 work?

For the A906446144260, first have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit. Finally, create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 inspects the unit on the test bench, repairs 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 A906446144260 get to Airbag24?

You send the control unit A906446144260 as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends your own unit back to you via UPS after the repair.

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