Airbag control unit with part number P68148021AC

What does the airbag control unit P68148021AC do?

The airbag control unit P68148021AC controls the restraint system (SRS) of Fiat. It reads the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners trigger, and checks the entire system during operation. It shows any faults it finds via the airbag warning light.

If an accident has occurred, the control unit stores crash data and locks itself. The lock is lifted only by the repair.

In everyday use, the unit works unobtrusively in the background and monitors its surroundings continuously.

Why does the control unit P68148021AC fail?

The most common cause is crash data that has been stored after an accident, even if no airbag has fired. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections and voltage spikes are also possible.

The crash data stays in the unit, because an ordinary diagnostic tool cannot remove it. During the repair at Airbag24 it is deleted.

Ageing components and cold solder joints mean that the electronics no longer work cleanly. Moisture and corrosion at the plugs disturb signal transmission.

Voltage spikes arise, for example, from a weak battery or from jump-starting.

How can you tell that the P68148021AC is defective?

Initial signs are an airbag warning light that stays on permanently or intermittently, a fault message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared. Airbags and seatbelt pretensioners may then not trigger in an emergency.

A check is advisable as soon as any of these signs appears.

• airbag warning light stays on permanently or comes on intermittently
• fault message in the instrument cluster
• diagnostic tool does not find the control unit
• fault memory cannot be cleared

The warning light exists to alert you to the state of the system.

Which vehicles is the P68148021AC fitted in?

The control unit P68148021AC is fitted in this vehicle: Fiat 500 312 (2007-2024).

You will find the vehicle stored for this part number in the following statement:

• Fiat 500 312 (2007-2024)

Compare the part number on the label of the removed unit with this page. This only checks whether the unit fits. Then have the fault memory read out, because this finding shows whether the control unit is defective or whether the cause lies in a connector or cable.

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 P68148021AC work?

Reading out the fault memory with the enclosed log comes first, then you disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send the unit in packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is examined on the test bench, defective components are replaced, stored crash data is deleted and a functional test is carried out. After that, your own unit 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 P68148021AC get to Airbag24?

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

Place the printed repair order in the parcel and pack the unit shock-proof.