Airbag control unit with part number 51802145

What does the airbag control unit 51802145 do?

The airbag control unit 51802145 coordinates the restraint system (SRS) of Fiat. It reads the signals from the crash sensors, decides in an accident within milliseconds about the triggering of airbags and seatbelt pretensioners, and checks the system continuously.

Faults appear via the airbag warning light in the instrument cluster. Monitoring runs in the background and covers sensors, wiring and the triggering electronics.

After an accident the unit stores crash data and locks itself.

Why does the control unit 51802145 fail?

Stored crash data is the most common cause, even if no airbag was triggered after the accident; a normal diagnostic tool cannot erase it. Airbag24 erases the crash data during the repair. Aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes also play a role.

An accident in which no airbags trigger can still lead to stored crash data. The unit records the event even though the vehicle looks unchanged from outside.

The other causes lie in the electronics. Components age, solder joints can be cold, and moisture or corrosion attack plug connectors. Voltage spikes occur, for example, with a weak battery or when jump-started.

How can you tell that the 51802145 is defective?

A defect shows through an airbag warning light that stays on permanently or intermittently, a fault message in the instrument cluster, a diagnostic tool that finds no control unit, or a fault memory that cannot be cleared.

• Airbag warning light stays on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

In these cases airbags and seatbelt pretensioners may not trigger in an emergency. Therefore have the vehicle checked promptly.

Which vehicles is the 51802145 fitted in?

The data for this part number assigns the control unit to Fiat vehicles. The control unit 51802145 is fitted in these vehicles: Fiat Croma 194 Facelift (2007-2011) and 194 (2005-2007).

Here is the overview of the assigned vehicles.

• Fiat Croma 194 Facelift (2007-2011)
• Fiat Croma 194 (2005-2007)

Comparing the part number on the label with this page only confirms that you have the right unit. Whether the control unit is defective or a plug or a cable is the cause only becomes clear from the fault memory read out beforehand.

For the same vehicles, we also repair control units with the part numbers 51814843.

How does the repair of the 51802145 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit, and create a repair order online. Airbag24 checks the unit, repairs defective components, erases stored crash data and carries out a function test.

The order is fixed for safety reasons: once the battery is disconnected you may remove the control unit. Then pack it well and send it in.

Processing at Airbag24 usually takes 3–4 working days, counted from receipt by us.

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 51802145 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 sends the repaired unit back to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.