Airbag control unit with part number 391177

What does the airbag control unit 391177 do?

The airbag control unit 391177 controls the restraint system (SRS) of Fiat. It evaluates the signals from the crash sensors and decides in an emergency which airbags and seatbelt pretensioners trigger. After an accident it stores crash data and locks itself.

During operation the unit monitors the entire system continuously. If it detects a fault, it displays it via the airbag warning light in the instrument cluster.

Because triggering in an emergency tolerates no delay, the control is designed precisely for this task.

Why does the control unit 391177 fail?

The most common cause of the 391177 is crash data stored after an accident, even if no airbag has triggered. Also to be considered are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

A normal diagnostic tool cannot delete the crash data. Airbag24 deletes it during the repair.

A contact at a plug connection gives way only under certain loads, which is why plugs are part of the cause search.

How can you tell that the 391177 is defective?

A fault in the 391177 shows itself via the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Typical are also an error message in the instrument cluster, no connection to the diagnostic tool and a fault memory that cannot be cleared.

Look out for the following signs:

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

In the event of a fault, airbags and seatbelt pretensioners may not trigger in an emergency. Therefore have the system checked promptly.

Which vehicles is the 391177 fitted in?

The control unit 391177 is installed in these vehicles: Fiat Panda 169 (2003-2012).

The list shows the vehicles in which the unit is known so far.

• Fiat Panda 169 (2003-2012)

Compare the number on the label of the removed unit with the number on this page. This ensures that it is the correct unit; the comparison says nothing more.

Also have the fault memory read out beforehand. Only this log 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 46807549, 46807550, 51778261, 51778262, 51803610, 51803612.

How does the repair of the 391177 work?

At Airbag24 the processing of the 391177 usually takes 3–4 working days. First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the carefully packed unit.

Airbag24 examines the unit on the test bench, removes the defects found, deletes the stored crash data and carries out a function test. Afterwards 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 391177 get to Airbag24?

You send the control unit 391177 in as a parcel or additionally book a UPS collection. After the repair, Airbag24 returns it by UPS.

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