Airbag control unit with part number 51867767

What does the airbag control unit 51867767 do?

The task of the airbag control unit 51867767 is to control the restraint system (SRS) in Fiat. It processes the signals from the crash sensors, determines whether airbags and seatbelt pretensioners are triggered in an accident, and checks the system constantly. It shows detected faults via the airbag warning light.

Triggering must happen within a fraction of a second. To do this, the unit constantly compares the sensor values with stored limit values.

After an accident, it stores crash data and locks itself.

Why does the control unit 51867767 fail?

Stored crash data is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot remove this data. Other possible causes include ageing electronics, cold solder joints, moisture at plug connections and voltage spikes.

The crash data itself remains in the control unit, even if no airbag has deployed. This is why the fault stays in the memory.

The other causes lie in the electronics itself. Components age, solder joints can go cold, and moisture or corrosion affects the plug connections. Voltage spikes, for example from a weak battery or a jump start, can also cause damage.

How can you tell that the 51867767 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. In addition, the diagnostic tool does not find the control unit, and the fault memory cannot be cleared.

The warning light is the visible alert that comes on when there is a fault in the restraint system. It shows that something is wrong in the system.

If any of these messages appears, airbags and seatbelt pretensioners may not be able to trigger in an emergency. A prompt check is therefore sensible.

Which vehicles is the 51867767 fitted in?

The assignment applies to Fiat. The control unit 51867767 is fitted in these vehicles: Fiat 500 312 (2007-2024).

These vehicles are recorded in the assignment:

• Fiat 500 312 (2007-2024)

Comparing the part number on the label of the removed unit with this page only confirms that you have the correct unit in front of you. Before that, have the fault memory read out, because this log shows whether the control unit is defective or whether plugs or cables are causing the fault.

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 51867767 work?

First have the fault memory read out and enclose the log with the unit. Then disconnect the battery and remove the control unit before you create a repair order online. Pack the unit well and send it in.

At the test bench, Airbag24 checks the unit; where necessary, a component is replaced. The stored crash data is deleted, and a functional test completes the work. Processing usually takes 3–4 working days.

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 51867767 get to Airbag24?

You send the unit as a parcel or book UPS collection for an extra charge. Airbag24 returns the repaired unit by UPS.

Enclose the printed repair order and make sure the packaging is shock-resistant.