Airbag control unit with part number P68139884AB

What does the airbag control unit P68139884AB do?

The airbag control unit P68139884AB coordinates the restraint system (SRS) for Fiat. It reads the crash sensors, calculates in milliseconds whether triggering is necessary, and then controls the airbags and seatbelt pretensioners.

Monitoring also runs constantly in the background. If the unit finds a fault, it switches on the airbag warning light. After an accident it stores crash data and remains locked afterwards.

Why does the control unit P68139884AB fail?

Most often the cause lies in crash data that remains in the memory after an accident, even if no airbag has fired. A normal diagnostic tool cannot erase it. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes caused by a weak battery or a jump start.

The crash data stays in the memory until it is removed. As a result, the control unit shows a fault even when nothing else in the system has changed.

The other triggers are rather general in nature. Electronics age, solder joints can go cold, and moisture attacks the contacts. Voltage spikes occur, for example, when the battery is weak or a vehicle is started with a jump start.

How can you tell that the P68139884AB is defective?

An airbag warning light in the instrument cluster that lights up permanently or only intermittently is the clearest sign. It is accompanied by a fault message in the instrument cluster, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The warning light is not a trivial matter. It reports a fault in the restraint system, and this fault must be investigated before you rely on the protective effect.

In this case the diagnostic tool gets no connection to the control unit, and the fault memory cannot be reset. Both point to a problem in the system.

Which vehicles is the P68139884AB fitted in?

Fitted in this vehicle is the control unit P68139884AB: Fiat 500 312 (2007-2024).

The list below names the vehicles in which this unit is known to be fitted.

• Fiat 500 312 (2007-2024)

(a) Matching the part number on the label of the removed unit with this page only ensures that it is the right unit. (b) Having the fault memory read out beforehand shows whether the control unit itself 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 P68139884AB work?

First have the fault memory read out and enclose the report. Then disconnect the battery and only afterwards remove the control unit P68139884AB. Then create the repair order online and send the unit in.

Airbag24 checks the unit on the test bench and replaces defective components. Afterwards Airbag24 erases stored crash data and carries out a function test. Processing usually takes 3–4 working days, after which your own unit is returned 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 P68139884AB get to Airbag24?

You send the control unit P68139884AB as a parcel, or you book a UPS collection for an extra charge. Airbag24 returns it to you by UPS after the repair.

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