Airbag control unit with part number 51969090

What does the airbag control unit 51969090 do?

The airbag control unit 51969090 is the central control unit of the restraint system (SRS) for Fiat. It processes the signals from the crash sensors, decides in an accident within milliseconds on triggering, and monitors the system continuously.

If it detects a fault, it shows this via the airbag warning light in the instrument cluster. The light is the direct feedback to the driver.

After an accident, the unit stores crash data and locks itself. This feature is part of the safety concept of the system.

Why does the control unit 51969090 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed, and a normal diagnostic tool cannot erase this data. Aged components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes can also contribute.

Crash data is the cause you usually find first during fault-finding. Only once it has been dealt with can the rest of the fault-finding be tackled sensibly.

The other causes are of a general nature. Electronic components change over time, solder joints can become cold, and moisture damages plug contacts. Voltage spikes, for example from a weak battery or jump-starting, also stress the unit.

How can you tell that the 51969090 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition, a fault message appears in the instrument cluster, and the diagnostic tool finds no connection to the control unit. If the fault memory cannot be cleared, that also points to a defect.

The warning light shows the defect and should therefore not be ignored. It is the feature by which you recognise the state of the system in everyday use.

In an emergency, airbags and seatbelt pretensioners may not deploy. A check should therefore not be postponed.

Which vehicles is the 51969090 fitted in?

The control unit is found in several vehicles, which are determined by the assignment to this part number. The airbag control unit 51969090 is fitted in these vehicles: Fiat 500L 199 Facelift (2017-2022) and 199 (2012-2017).

The vehicles known to us for this number are listed below.

• Fiat 500L 199 Facelift (2017-2022)
• Fiat 500L 199 (2012-2017)

You should compare the part number on the label of the removed unit with this page. This ensures that it is the correct unit. Also have the fault memory read beforehand, because the result 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 51943893, 51963734, A2C81350100.

How does the repair of the 51969090 work?

Processing at Airbag24 usually takes 3–4 working days. Beforehand, have the fault memory read and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online.

Airbag24 tests the unit on the test bench, repairs defective components, erases the stored crash data and carries out a functional test. Your own unit then goes back to you.

These working days apply solely to testing, repairing and checking 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 51969090 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.

Put the printed repair order in the parcel, and pack the unit shock-resistant so that it is protected during transport.