Airbag control unit with part number A1779007318

What does the airbag control unit A1779007318 do?

The A1779007318 is an airbag control unit for the restraint system of Mercedes-Benz. It processes the sensor signals, decides in a crash within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

The manufacturer's part number Bosch 0285012365 is also printed on the housing. The unit reports faults via the airbag warning light.

After an accident it stores crash data and locks itself. The lock is lifted only by the repair.

Why does the control unit A1779007318 fail?

The most common cause is crash data from an accident that remains in the memory even if no airbag was triggered. A normal diagnostic tool cannot remove it; Airbag24 deletes it during the repair. Further causes are aged components, cold solder joints, moisture and corrosion on plugs, and voltage spikes, for example from jump-starting or a weak battery.

Plug connections deserve attention, because contacts can change over time.

A repair therefore checks not only the inner workings but the entire unit.

How can you tell that the A1779007318 is defective?

The airbag warning light in the instrument cluster indicates the fault when it lights up permanently or intermittently. Typical are also a fault message in the instrument cluster, a missing connection of the diagnostic tool, and a fault memory that cannot be cleared.

• Airbag warning light lights up permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

In this state, airbags and seatbelt pretensioners may not trigger in an emergency.

Which vehicles is the A1779007318 fitted in?

The A1779007318 is fitted in these vehicles: Mercedes-Benz A-Class W177 (from 2018); Mercedes-Benz B-Class W247 (from 2018). The assignment applies to this part number.

The vehicles are listed here:

• Mercedes-Benz A-Class W177 (from 2018)
• Mercedes-Benz B-Class W247 (from 2018)

Comparing the part number on the label of the removed unit with this page confirms that it is the right unit. Only a fault memory read out beforehand shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 0 285 015 019, 0285020871, 285015019, A 177 900 03 04, A1779025121, A1779027906.

How does the repair of the A1779007318 work?

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

Airbag24 tests the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. The unit 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 A1779007318 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns the control unit A1779007318 by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.