Airbag control unit with part number A1779002410

What does the airbag control unit A1779002410 do?

The airbag control unit A1779002410 controls the restraint system (SRS) for Mercedes-Benz. It evaluates the signals from the crash sensors and decides in a real emergency, within milliseconds, which airbags and seatbelt pretensioners are triggered.

The system monitors everything continuously and shows faults found via the airbag warning light. The housing also carries the manufacturer number Bosch 0285015020.

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

Why does the control unit A1779002410 fail?

Stored crash data is the most frequent cause of failure, even when no airbag has fired, and ordinary diagnostic tools cannot erase it. Aged components, cold solder joints, moisture and voltage spikes are also possible causes.

Crash data remains in the memory after an accident, even if no airbag fired. Airbag24 deletes it during the repair, because a diagnostic tool does not take that on.

In addition, several causes that develop over time come into question: aged electronic components, cold solder joints, moisture and corrosion at plug connections. Voltage spikes, for example from a weak battery or jump-starting, also stress the electronics.

How can you tell that the A1779002410 is defective?

The fault shows itself on the airbag warning light, which lights up at times or permanently. In addition, error messages appear, the diagnostic tool finds no connection, and the fault memory cannot be cleared. In a real emergency, airbags and seatbelt pretensioners may then fail to deploy.

Typical signs at a glance:

• Airbag warning light in the instrument cluster, permanent or intermittent
• Error message in the instrument cluster
• Diagnostic tool without connection to the control unit
• Fault memory that cannot be cleared

If you notice any of these signs, have the system checked promptly.

Which vehicles is the A1779002410 fitted in?

The A1779002410 is installed in these vehicles: Mercedes-Benz A-Class W177 (from 2018).

The vehicles for this unit follow as a list:

• Mercedes-Benz A-Class W177 (from 2018)

Comparing the part number on the label with this page only confirms that the removed unit is the right one. Have the fault memory read out before removal, because only it shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 0 285 015 019, 0285020871, A 177 900 03 04, A1779027906, A2479013703, A2479018801.

How does the repair of the A1779002410 work?

First, have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit A1779002410 and create the repair order online. Afterwards, you send the unit off well packed. At Airbag24, processing usually takes 3–4 working days.

At Airbag24, the unit is checked on the test bench, defective components are reworked, the crash data is deleted and a functional 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 A1779002410 get to Airbag24?

You send the control unit A1779002410 to Airbag24 as a parcel, or you book a UPS collection, which is available for an additional charge. Airbag24 returns it via UPS after the repair.

Enclose the printed repair order with the parcel, and pack the unit shock-proof as well.