Airbag control unit with part number 51759725

What does the airbag control unit 51759725 do?

The airbag control unit 51759725 manages the restraint system (SRS) of Fiat. It reads the crash sensors, determines in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The control unit works in the background and constantly checks its connections. A fault is shown via the airbag warning light, so that the system can be examined promptly.

The decision on triggering is made by the electronics in a very short time.

Why does the control unit 51759725 fail?

The most common cause is stored crash data after an accident, even if no airbag was triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 erases it during repair, so your unit comes back without these entries.

The remaining causes concern the electronics themselves and their surroundings. Components age, solder joints can become cold, and moisture or corrosion attack the plug connectors. Voltage spikes, for example from a weak battery or jump starting, put additional strain on the electronics.

How can you tell that the 51759725 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition there is a fault message in the instrument cluster, a missing connection to the control unit at the diagnostic tool, and a fault memory that cannot be cleared.

Signs like these are clear enough to have the system checked. Until then, the airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light shows the fault itself; a glance at the instrument cluster is enough to keep an eye on it.

Which vehicles is the 51759725 fitted in?

The control unit 51759725 is fitted in these vehicles: Fiat Multipla 186 (1999-2004) and 186 Facelift (2004-2008). This information comes from the assignment to the part number and is a guide for comparison.

The assignment lists these vehicles:

• Fiat Multipla 186 (1999-2004)
• Fiat Multipla 186 Facelift (2004-2008)

Compare the number on the label of the removed unit with this page; that only confirms it is the right unit. Having the fault memory read out is the second, more important step, because only the result shows whether the control unit is defective or whether a plug or cable is to blame.

For the same vehicles, we also repair control units with the part numbers 51759726, 5WK42818.

How does the repair of the 51759725 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, and only in the next step remove the control unit. Next, create a repair order online and send in the unit well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards your own unit comes back to you.

Processing at Airbag24 usually takes 3–4 working days. This period covers only checking, repairing and testing. 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 51759725 get to Airbag24?

Either you send the unit in as a parcel, or you book a UPS collection for an extra charge. After the repair it comes back from Airbag24 by UPS.

Enclose the printed repair order in the parcel, and the unit must be packed shock-resistant.