Airbag control unit with part number A2218708292

What does the airbag control unit A2218708292 do?

The airbag control unit A2218708292 coordinates the restraint system (SRS) in Mercedes-Benz. It evaluates the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners trigger.

During operation it monitors the system and shows faults via the airbag warning light in the instrument cluster. The housing also carries the manufacturer's number Bosch 0285010214.

After an accident the unit stores crash data and locks itself.

Why does the control unit A2218708292 fail?

Stored crash data is the most common cause with A2218708292, even if no airbag was triggered. Ageing electronics, cold solder joints, moisture and corrosion as well as voltage spikes can also cause failure.

Crash data cannot be erased with a standard diagnostic tool. Airbag24 removes it during the repair.

The other causes affect electronics and contacts. Aged components, cold solder joints and moisture at plug connections disrupt operation, and voltage spikes arise, for example, from a weak battery or a jump start.

How can you tell that the A2218708292 is defective?

A problem at the A2218708292 first becomes visible through the airbag warning light, which lights permanently or intermittently. Error messages, a missing diagnostic connection and a fault memory that cannot be cleared follow as further signs. Then airbags and seatbelt pretensioners may not trigger in an emergency.

• Airbag warning light in the instrument cluster, permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool does not reach the control unit
• Fault memory cannot be cleared

The warning light is the starting point of every check. Only reading out the fault memory shows the exact finding.

Which vehicles is the A2218708292 fitted in?

The airbag control unit A2218708292 is built for Mercedes-Benz and fitted in these vehicles: Mercedes-Benz S-Class W221 Saloon (2005-2013).

Here the vehicles follow as a list:

• Mercedes-Benz S-Class W221 Saloon (2005-2013)

Comparing the part number on the label of the unit with this page only confirms that it is the correct unit. Regarding the cause, this comparison says nothing. Therefore have the fault memory read out, because it 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 2218200226, 2218704887, 285001896, 285001995, A0048201326, A2218200985.

How does the repair of the A2218708292 work?

At the start stands the reading out of the fault memory with the log enclosed. Only after disconnecting the battery follows the removal of the control unit A2218708292, then the repair order online and the well-packed sending in.

At the test bench Airbag24 examines the unit, replaces defective components where needed, erases the stored crash data and carries out a functional test.

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 A2218708292 get to Airbag24?

You send the unit A2218708292 as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 returns the repaired unit by UPS.

The printed repair order goes into the parcel, and the unit is packed shockproof.