Airbag control unit with part number 46744909

What does the airbag control unit 46744909 do?

The airbag control unit 46744909 is the central control unit of the restraint system (SRS) in the Fiat. It processes the signals from the crash sensors, determines within milliseconds in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

It shows faults via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. The term SRS control unit refers to the same component.

Why does the control unit 46744909 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. Aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes can also lead to failure.

A standard diagnostic tool cannot remove the crash data. Airbag24 clears it during the repair.

The remaining causes relate to ageing and moisture: electronic components age, solder joints can have been made cold, and plug connections absorb moisture that leads to corrosion.

Voltage spikes, for example from a weak battery or jump-starting, place additional strain on the control unit.

How can you tell that the 46744909 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition, the instrument cluster shows an error message, the diagnostic tool cannot find the control unit, and the fault memory cannot be cleared.

Such a finding is clear and shows that the system must be checked.

In an emergency, airbags and seatbelt pretensioners may fail to deploy.

Which vehicles is the 46744909 fitted in?

The 46744909 is fitted in these vehicles: Fiat Punto 176 (1993-2000).

The list shows the vehicles in which the unit is fitted:

• Fiat Punto 176 (1993-2000)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Also have the fault memory read out, because only this log 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 46430655, 46517272, 46772034.

How does the repair of the 46744909 work?

Processing at Airbag24 usually takes 3–4 working days. First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit 46744909.

Then create the repair order online and pack the unit well before sending it in. Airbag24 checks it on the test bench, replaces defective components, clears the crash data and carries out a function test.

Your own unit is then returned to you. 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 46744909 get to Airbag24?

You send the control unit 46744909 in as a package, or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order in the package and pack the unit shock-proof.