Airbag control unit with part number A1779005513

What does the airbag control unit A1779005513 do?

In the Mercedes-Benz, the airbag control unit A1779005513 controls the SRS, i.e. the restraint system. From the messages of the sensors it calculates which airbags and seatbelt pretensioners should fire in a crash. If an accident has occurred, it secures crash data and locks itself.

In addition, the housing carries the manufacturer number Bosch 0285020644. During operation the unit continuously monitors the system and reports faults via the airbag warning light.

Why does the control unit A1779005513 fail?

The most common cause is crash data that stay stored after an accident, even if no airbag was triggered. They cannot be erased with a normal diagnostic tool. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, as well as voltage spikes.

The crash data are stored in the control unit itself. Airbag24 erases them during the repair, so that they are no longer in memory afterwards.

For the other causes, it depends on the condition of the electronics and the contacts.

How can you tell that the A1779005513 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears. The diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared. Then airbags and seatbelt pretensioners may possibly not trigger in an emergency.

The signs at a glance:

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

Only the readout shows whether the fault lies in the control unit or in the wiring.

Which vehicles is the A1779005513 fitted in?

The A1779005513 occurs in this vehicle: Mercedes-Benz A-Class W177 (from 2018).

The vehicle data for this part number are shown here:

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

Compare the part number on the label of the removed unit with this page. That only tells you whether it is the right unit, nothing more.

Have the fault memory read out before removal. The log shows whether the control unit is defective or whether a plug or a cable is responsible for the failure.

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 A1779005513 work?

At the start the fault memory is read out, and you enclose its log with the unit. Then you disconnect the battery and remove the control unit A1779005513, followed by the repair order online. For testing, repairing and checking at Airbag24, allow 3–4 working days as a rule.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. Your own unit is then sent 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 A1779005513 get to Airbag24?

You send the control unit A1779005513 as a parcel to Airbag24, or you book a UPS collection for an extra charge. The unit comes back to you after the repair, likewise by UPS.

The printed repair order goes into the parcel. Pack the unit shock-resistant so that it arrives undamaged.