Airbag control unit with part number A2079012000

What does the airbag control unit A2079012000 do?

The airbag control unit A2079012000 is the control unit of the restraint system (SRS) in Mercedes-Benz. From the signals of the crash sensors it decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and it monitors the system continuously.

Detected faults are shown by the unit via the airbag warning light. This tells the driver that something is wrong in the restraint system.

After an accident, the control unit creates crash data and locks itself. The repair is the only way to lift the lock.

Why does the control unit A2079012000 fail?

The most common causes are crash data stored after an accident, even if no airbag was triggered. Other causes are ageing electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or a jump start.

A normal diagnostic tool cannot delete this crash data. The unit therefore keeps it until the repair takes place.

Ageing electronic components and cold solder joints can cause faults on their own. Moisture and corrosion at the plug connections worsen the contact.

Voltage spikes additionally stress the electronics during operation.

How can you tell that the A2079012000 is defective?

An airbag warning light in the instrument cluster that stays on permanently or intermittently, an error message in the instrument cluster, no connection from the diagnostic tool, and a fault memory that cannot be cleared are the signs. Then airbags and seatbelt pretensioners may not deploy in an emergency.

The light shows the defect, which makes it the most important warning sign. When these signs appear, the restraint system should be checked promptly.

Reading out the fault memory shows whether the control unit itself is affected.

Which vehicles is the A2079012000 fitted in?

The control unit A2079012000 is fitted in these vehicles: Mercedes-Benz E-Class C207 Coupé (2009-2016) and A207 Convertible (2010-2017).

The vehicles assigned to this part number follow here.

• Mercedes-Benz E-Class C207 Coupé (2009-2016)
• Mercedes-Benz E-Class A207 Convertible (2010-2017)

Compare the part number on the label of the removed unit with this page. This only ensures that you have the correct unit. Have the fault memory read out beforehand as well, because only the log shows whether the control unit is defective or a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 2079011700, A2078203226, A2079010100, A212 901 85 08.

How does the repair of the A2079012000 work?

For A2079012000, the fault memory is read out first and the log goes with the unit. Then disconnect the battery and remove the control unit. Create the repair order online and send in the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. The unit you own 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 A2079012000 get to Airbag24?

You send the control unit A2079012000 as a parcel or arrange a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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