Airbag control unit with part number P04727799AA

What does the airbag control unit P04727799AA do?

The airbag control unit P04727799AA controls the restraint system (SRS) for Fiat. It evaluates the signals from the crash sensors, decides in a crash whether airbags and seatbelt pretensioners are triggered, and shows faults via the airbag warning light.

It checks the system continuously and stores crash data after an accident. Afterwards, it locks itself.

From the driver's point of view, it is invisible as long as everything is in order. Only the warning light makes it noticeable.

Why does the control unit P04727799AA fail?

Crash data from an accident is the most common cause with the P04727799AA, even if no airbag has deployed, and a normal diagnostic tool cannot delete it. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data remains in the unit. Airbag24 removes it during the repair; common tools are not sufficient for this.

The other causes creep in: electronics age, solder joints become brittle, and damp and rust attack the contacts. Voltage spikes from weak batteries or jump-starting, by contrast, occur suddenly.

How can you tell that the P04727799AA is defective?

A defect on the P04727799AA shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently. A fault message in the instrument cluster or a fault memory that cannot be cleared also indicates a problem. In an emergency, airbags and seatbelt pretensioners may fail to deploy.

The diagnostic tool may also find no connection to the control unit; this too is a sign that something in the system is wrong.

The warning light is a message from the system and not a trivial matter.

Which vehicles is the P04727799AA fitted in?

The unit with the number P04727799AA is fitted in these vehicles: Fiat 500 312 (2007-2024).

The assigned vehicles are listed here:

• Fiat 500 312 (2007-2024)

Compare the part number on the label of the removed unit with this page. This way you can tell whether it is the right unit; the comparison tells you nothing more. Have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a connector or cable is behind it.

For the same vehicles, we also repair control units with the part numbers 51782985, 51870005, 51897810, 51918659, 51963734, 519637734.

How does the repair of the P04727799AA work?

For the P04727799AA, the sequence is as follows: first have the fault memory read out and enclose the log, then disconnect the battery before the control unit is removed. Then create a repair order online and send the unit off well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the unit is checked, and defective components are replaced if necessary. Airbag24 then deletes the stored crash data, carries out a functional test and returns your own unit.

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 P04727799AA get to Airbag24?

You send the airbag control unit P04727799AA as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Print out the repair order and put it in the parcel, and pack the unit shockproof.