Airbag control unit with part number P68185791AA

What does the airbag control unit P68185791AA do?

The airbag control unit P68185791AA controls the airbags and seatbelt pretensioners as part of the restraint system (SRS) of Fiat. It processes the signals from the crash sensors, makes the triggering decision in milliseconds in an accident and checks all components continuously.

Detected faults are passed on via the airbag warning light. After an accident the control unit stores crash data and locks itself.

It is closely connected to sensors, wiring and firing circuits. That is why diagnosing the entire system is the right approach as soon as a fault occurs.

Why does the control unit P68185791AA fail?

For the control unit P68185791AA, stored crash data after an accident is the most common cause, even if no airbag has deployed. Ageing components, cold solder joints, moisture and corrosion at plugs, and voltage spikes are also considered.

Crash data remains in memory after an accident, even if no airbag has opened. A standard diagnostic tool cannot delete it. Airbag24 removes it in the course of the repair.

The other causes lie in the electronics and their connections: components age, solder joints can turn cold, and moisture or corrosion at the connectors disturbs the signals. Voltage spikes, for example from a weak battery or a jump-start, can additionally strain components.

How can you tell that the P68185791AA is defective?

A defect at the P68185791AA can be recognised by the airbag warning light in the instrument cluster, which lights up permanently or intermittently, by a fault message in the instrument cluster, by a missing connection to the diagnostic tool, and by a fault memory that cannot be cleared.

The airbag warning light in the instrument cluster shows the fault most clearly, because it lights up permanently or comes on again intermittently. A fault message also appears on the display.

If no connection to the control unit can be made or the fault memory remains, the system is disturbed. Airbags and seatbelt pretensioners may then not trigger in an emergency, and a check is advisable.

Which vehicles is the P68185791AA fitted in?

The control unit P68185791AA matches the models on record for Fiat. It is fitted in these vehicles: Fiat 500 312 (2007-2024).

The following overview lists the known vehicles with this part number.

• Fiat 500 312 (2007-2024)

Comparing the part number on the label of the removed unit with this page tells you that it is the correct unit. Please have the fault memory read out beforehand; it 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 P68185791AA work?

First have the fault memory read out and enclose the log. Then disconnect the battery, only then remove the control unit P68185791AA, and create the repair order online before you send the unit.

This order is fixed for safety reasons. Pack the removed unit so that it does not shift in the box.

Airbag24 examines the unit on the test bench, replaces defective components, deletes the crash data and carries out a function test. 3–4 working days are planned for this at Airbag24.

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 P68185791AA get to Airbag24?

The control unit P68185791AA reaches Airbag24 either as a parcel or with a UPS collection booked for an extra charge. After the repair Airbag24 sends it back by UPS.

Enclose the printed repair order and protect the unit with shock-proof packaging.