Airbag control unit with part number P68185790AB

What does the airbag control unit P68185790AB do?

The airbag control unit P68185790AB is the control unit of the restraint system (SRS) of Fiat. It processes the measuring signals from the crash sensors, decides within fractions of a second in a collision whether airbags and seatbelt pretensioners are triggered, and monitors the system permanently. Detected faults are shown via the airbag warning light.

While driving, the unit continuously evaluates whether all connected components work correctly. If it detects a deviation, it stores it in the fault memory.

If an accident occurs, the unit secures the crash data and then locks itself. The lock is only lifted by the repair.

Why does the control unit P68185790AB fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data is created as soon as the unit detects an impact. It remains in the memory even if the airbag was not triggered, and it stands in the way of a normal diagnosis.

Aged electronic components and cold solder joints on the circuit board are classic causes of failure. Moisture and corrosion at the plug connections further worsen the contact.

Voltage spikes in the vehicle electrics, for example from a weak battery or a jump start, also stress the components.

How can you tell that the P68185790AB is defective?

Typical signs are the airbag warning light in the instrument cluster, which stays on permanently or intermittently, an error message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The airbag warning light in the instrument cluster is the first sign you will notice. It lights up permanently or intermittently as soon as the system has detected a fault, and it shows that a check is needed.

An error message in the instrument cluster, or a diagnostic tool that cannot establish a connection to the control unit, are also clear signs. If the fault memory also cannot be cleared, have the system checked promptly.

Which vehicles is the P68185790AB fitted in?

The airbag control unit P68185790AB is fitted in these vehicles: Fiat 500 312 (2007-2024).

You will find the vehicles in which this part number occurs in this overview:

• Fiat 500 312 (2007-2024)

Compare the part number on the label of the removed unit with this page. This only shows whether it is the right unit. Whether the control unit is defective or a plug or cable is the cause can only be seen from the fault memory read out beforehand.

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 P68185790AB work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Afterwards create a repair order online and send in the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and repairs defective components. Afterwards, Airbag24 erases the stored crash data and carries out a function test.

Afterwards your own unit is returned to you. The order of removal serves safety and must therefore be observed.

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 P68185790AB get to Airbag24?

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

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