Airbag control unit with part number P68385559AB

What does the airbag control unit P68385559AB do?

The airbag control unit P68385559AB is the computer for the restraint system (SRS) of Fiat. It evaluates signals from the crash sensors, decides within milliseconds whether airbags and seatbelt pretensioners are triggered in an accident, and reports faults to the airbag warning light.

It works in the background throughout the journey and checks the system continuously. After an accident it stores crash data and locks itself.

How the interaction works in detail remains hidden from the driver; it only becomes visible through displays in the instrument cluster.

Why does the control unit P68385559AB fail?

The most common cause with the P68385559AB is stored crash data from an accident, even if no airbag has triggered. A normal diagnostic tool cannot erase it. Other triggers are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data remains stored in the control unit even after the vehicle drives normally again. It cannot be removed with usual means; Airbag24 erases it during the repair.

The other causes develop gradually: electronics age, solder joints crack, and moisture and corrosion attack plug connections. Voltage spikes, for example from a weak battery or a jump start, additionally strain the unit.

How can you tell that the P68385559AB is defective?

The airbag warning light in the instrument cluster lights up on the P68385559AB, either permanently or intermittently. In addition, a fault message may appear, the diagnostic tool does not reach the control unit, and the fault memory remains. In an emergency, airbags and seatbelt pretensioners may not trigger.

The warning light is not a trivial matter, because the light itself reports the defect. A fault message in the instrument cluster confirms the finding.

If the diagnostic tool cannot reach the control unit, the fault does not necessarily lie in the control unit itself; this is exactly what the check clarifies.

Which vehicles is the P68385559AB fitted in?

The airbag control unit P68385559AB is fitted in these vehicles: Fiat 500 312 (2007-2024).

The list shows the models in which this unit is installed:

• Fiat 500 312 (2007-2024)

Checking the label and comparing the part number with this page only confirms the part number. Have the fault memory read out before removal: only this result 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 51782985, 51870005, 51897810, 51918659, 51963734, 519637734.

How does the repair of the P68385559AB work?

For the P68385559AB, this order applies: first have the fault memory read out and attach the log, then disconnect the battery. Only then remove the control unit, and afterwards create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Then send the well-packed unit in. Airbag24 checks the unit on the test bench, repairs defective components where necessary, erases the stored crash data and carries out a functional test. The unit then comes 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 P68385559AB get to Airbag24?

The airbag control unit P68385559AB can be sent in as a parcel, or you can book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

The printed repair order belongs in the parcel. Pack the unit shock-proof, so it survives transport undamaged.