Airbag control unit with part number 51952928

What does the airbag control unit 51952928 do?

The airbag control unit 51952928 is the central control unit of the restraint system (SRS) in Fiat. It evaluates the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It reports faults via the airbag warning light.

In an emergency the decision has to be made so quickly that airbags and seatbelt pretensioners take effect in time. To this end the unit constantly checks the sensors and the connections to the firing circuits during operation.

After an accident it stores crash data and then locks itself. The manufacturer's number Bosch 0285012075 is additionally printed on the housing.

Why does the control unit 51952928 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered, and which cannot be erased with a normal diagnostic tool. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remain in the memory until they are erased. At Airbag24 this happens during the repair, after which the unit is tested.

Aged electronics, yielding solder joints and moisture at the plugs also cause failures. Corrosion on the contacts can make the problem worse.

Voltage spikes, for example from a weak battery or jump-starting, additionally stress the circuit and can damage components.

How can you tell that the 51952928 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the instrument cluster. In addition, no connection to the diagnostic tool is established, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

The light indicates the defect, even when it comes on only now and then. Such a signal needs to be checked.

A missing connection to the diagnostic tool can also be due to cables. Only reading out the fault memory shows which fault is present.

Which vehicles is the 51952928 fitted in?

The unit 51952928 is fitted in these vehicles: Fiat 500 312 (2007-2024).

The following list names the vehicles for this part number:

• Fiat 500 312 (2007-2024)

Comparing the part number on the label with this page only confirms that it is the correct unit. Whether the control unit itself is defective, or whether a plug or cable is the cause, is shown only by the fault memory read out beforehand.

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 51952928 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Afterwards create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

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

The time specified refers only to testing, repairing and checking at Airbag24 and covers neither your work steps nor the shipping.

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 51952928 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-proof.