Airbag control unit with part number P68148022AC

What does the airbag control unit P68148022AC do?

The P68148022AC is the central control unit of the restraint system (SRS) for Fiat. It evaluates the crash sensors, decides in a crash within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system constantly.

The control unit stores faults in the fault memory and shows them via the airbag warning light. The display in the instrument cluster is therefore the first indication of a fault.

After an accident the unit records crash data and locks itself. Only a repair lifts the lock.

Why does the control unit P68148022AC fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot remove it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains in the memory even if the vehicle then drives normally. An ordinary reader cannot reach it.

Aged components, cold solder joints and damp plug connections can also lead to a failure. Voltage spikes, for example from a weak battery or from jump-starting with external power, belong to this group as well.

How can you tell that the P68148022AC is defective?

A defect shows up as the airbag warning light lighting up permanently or intermittently, as an error message in the instrument cluster, as a lost connection to the diagnostic tool, and as a fault memory that cannot be cleared.

• Airbag warning light lit permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

With these signs, the airbags and seatbelt pretensioners may not deploy in an emergency.

Take the warning seriously and have the fault checked promptly.

Which vehicles is the P68148022AC fitted in?

The P68148022AC is fitted in these vehicles: Fiat 500 312 (2007-2024).

The following vehicles have this part number on record:

• Fiat 500 312 (2007-2024)

Compare the part number on the label of the removed unit with this page to make sure you have the right unit. Also have the fault memory read out, as only this result shows whether the control unit is defective or whether a plug or cable is responsible.

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 P68148022AC work?

First have the fault memory read out and enclose the log. Then disconnect the battery; only then remove the unit. Next, create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Keep to this order, as the control unit may only be removed after the battery has been disconnected. The log goes into the parcel.

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

The unit is then 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 P68148022AC 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 to you by UPS.

Enclose the printed repair order in the parcel and pack the unit shockproof.