Airbag control unit with part number A9079006203

What does the airbag control unit A9079006203 do?

The airbag control unit A9079006203 is the switching centre of the SRS system in Mercedes-Benz. It evaluates the signals from the crash sensors, determines in a crash within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the entire system.

The manufacturer number Bosch 0285014933 is also printed on the housing. The control unit runs throughout the whole journey and continuously checks the connected components.

If a fault occurs, the unit records it in the fault memory and shows it via the airbag warning light. After an accident it also stores crash data and locks itself.

Why does the control unit A9079006203 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a standard diagnostic tool does not clear it. Aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes can also be involved.

Whether an individual component is affected only becomes clear from the readout and the subsequent check.

Stored crash data alone does not prove damage to the triggering system. A weak battery or jump-starting can additionally create voltage spikes that strain the electronics.

How can you tell that the A9079006203 is defective?

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

The light reports the fault directly, so you do not need to wait for further signs.

Resetting the light does not remove the cause, which is why checking the fault memory is part of the process.

Which vehicles is the A9079006203 fitted in?

The A9079006203 is fitted in these vehicles: Mercedes-Benz Sprinter W907 (from 2018). Compare these details with your vehicle.

The vehicles to which this part number belongs can be found in the following overview:

• Mercedes-Benz Sprinter W907 (from 2018)

Compare the part number on the label of the removed unit with this page. This only establishes whether it is the correct unit, nothing more. Also have the fault memory read out beforehand, because only this result shows whether the control unit itself is the cause or whether a connector or cable is affected.

For the same vehicles, we also repair control units with the part numbers 285010033, 285010349, 285011400, 285015024, A 907 900 48 07, A9079000304.

How does the repair of the A9079006203 work?

First, have the fault memory read out and enclose the log. Then disconnect the battery, and only then remove the control unit. Online, you create the repair order and send in the well-packed unit.

Airbag24 checks the unit on the test bench and replaces damaged parts. Stored crash data is cleared, and a function test concludes the work. Afterwards, your own unit goes back to you. Processing at Airbag24 usually takes 3–4 working days.

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 A9079006203 get to Airbag24?

You send the control unit A9079006203 as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair.

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