Airbag control unit with part number A2079014200

What does the airbag control unit A2079014200 do?

The airbag control unit A2079014200 takes over control of the restraint system (SRS) in Mercedes-Benz. It evaluates the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident, it stores crash data and locks itself.

If the system detects a fault, it is shown via the airbag warning light in the instrument cluster. Monitoring takes place throughout the operation of the vehicle.

Correct evaluation is the basis for the restraint system working as intended in an emergency.

Why does the control unit A2079014200 fail?

Most often, failures are caused by crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase this data. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains stored in the control unit after the accident. The other causes may lie in the electronics themselves or at the plug connections.

Voltage spikes arise, for example, from a weak battery or when starting with external power via a jump start. They can also load the control unit.

How can you tell that the A2079014200 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, there is an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be erased.

The warning light is the indication that shows the defect directly. Pay attention to it first.

In an emergency, the airbags and seatbelt pretensioners may fail to trigger if the control unit is defective. A prompt check is therefore sensible.

Which vehicles is the A2079014200 fitted in?

The airbag control unit A2079014200 is fitted in these vehicles: Mercedes-Benz E-Class C207 Coupé (2009-2016) and A207 Convertible (2010-2017).

The vehicles in which this part number occurs are listed below:

• 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 ensures that it is the right unit. Have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or whether a plug or 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 A2079014200 work?

You have the fault memory read out and attach the log. Then you disconnect the battery and only then remove the control unit A2079014200. Next, create a repair order online and send in the well-packed unit. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

At Airbag24, the unit is examined on the test bench. Defective components are replaced, the crash data is erased and a function test is carried out.

Afterwards, your own unit 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 A2079014200 get to Airbag24?

You send the control unit A2079014200 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order in the parcel. Pack the unit shock-proof.