Airbag control unit with part number A2048202285

What does the airbag control unit A2048202285 do?

The airbag control unit A2048202285 is responsible for evaluating the crash sensors in the Mercedes-Benz restraint system (SRS). In an accident it determines within fractions of a second which airbags and seatbelt pretensioners are triggered, and monitors the system constantly.

Detected faults are shown via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself.

Without a control unit that works properly, the system cannot react reliably in an emergency.

Why does the control unit A2048202285 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Further causes are aged electronic components, cold solder joints, moisture and corrosion, and voltage spikes.

The crash data arises because the sensors register an impact that the unit considers relevant. Whether an airbag was triggered by it cannot be read from the data. With common diagnostic equipment the data cannot be removed from the installed unit.

The other causes are not based on an accident. Older components, moist or corroded plug connections, and voltage spikes from a weak battery or a jump start strain the electronics over time.

How can you tell that the A2048202285 is defective?

A defect shows itself through the airbag warning light, which lights up permanently or intermittently, through an error message in the instrument cluster, or through a lack of connection to the diagnostic tool. A fault memory that cannot be cleared is also a sign. In that case airbags and seatbelt pretensioners may not trigger in an emergency.

• Airbag warning light lights up permanently or intermittently
• Error message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

Please have one of these findings checked promptly, because the warning light reliably shows the defect.

Which vehicles is the A2048202285 fitted in?

The control unit A2048202285 is fitted in these vehicles: Mercedes-Benz C-Class S204 Estate (2007-2014), W204 Saloon (2007-2014) and C204 Coupé (2011-2015). You can check whether your vehicle is among them by make and model.

These vehicles are known to us for this part number:

• Mercedes-Benz C-Class S204 Estate (2007-2014)
• Mercedes-Benz C-Class W204 Saloon (2007-2014)
• Mercedes-Benz C-Class C204 Coupé (2011-2015)

Comparing the part number on the label of the removed unit with this page only ensures that you have the right unit. In addition, have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 2048709426, 5WK44740, A204 870 68 26, A204 901 26 04, A204 901 35 02, A2048208285.

How does the repair of the A2048202285 work?

First read out the fault memory and include the log, then disconnect the battery and remove the control unit. Afterwards create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

The order protects you while working on the vehicle. The control unit is removed only after the battery has been disconnected.

Airbag24 checks the unit on the test bench, repairs or replaces defective components, deletes the crash data and carries out a function test. The unit then comes 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 A2048202285 get to Airbag24?

You send the control unit A2048202285 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Enclose the printed repair order with the parcel and pack the unit shockproof.