Airbag control unit with part number 46479364

What does the airbag control unit 46479364 do?

The 46479364 works as the SRS control unit for Fiat and evaluates the signals from the crash sensors. Within milliseconds, it decides in a crash which airbags and seatbelt pretensioners fire, and it constantly checks the system for faults.

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

After an accident it secures crash data and then locks itself.

Why does the control unit 46479364 fail?

Stored crash data is the most common cause in the 46479364, even if no airbag has fired. A normal diagnostic tool cannot erase this data. Other possible causes include aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

The fact that no airbag fired therefore does not mean the control unit holds no record.

The other causes act over a longer period: ageing, moisture and corrosion gradually worsen the contacts until the unit displays faults.

How can you tell that the 46479364 is defective?

The airbag warning light in the instrument cluster stays on permanently or flashes from time to time, an error message appears on the 46479364, the diagnostic tool finds no connection, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to fire.

The warning light makes the state of the system visible, regardless of how the vehicle behaves in everyday use.

A diagnostic tool without a connection to the control unit is a further reason to have the system checked.

Which vehicles is the 46479364 fitted in?

The 46479364 is fitted in these vehicles: Fiat Brava 182 (1995-1998) and 182 Facelift (1998-2001); Fiat Bravo 182 Facelift (1999-2001) and 182 (1995-1999).

The vehicles assigned to this part number follow below.

• Fiat Brava 182 (1995-1998)
• Fiat Brava 182 Facelift (1998-2001)
• Fiat Bravo 182 Facelift (1999-2001)
• Fiat Bravo 182 (1995-1999)

Compare the part number on the label of the removed unit with this page. This only confirms that you have the matching unit in front of you. Whether a fault lies in the control unit or the cause is in a plug or cable is revealed only by the fault memory, which you should have read out before removal.

For the same vehicles, we also repair control units with the part numbers 46413633, 464793640, 46538652, 46541774, 46750553, 46768868.

How does the repair of the 46479364 work?

First, have the fault memory of the 46479364 read out and attach the log. Then disconnect the battery, remove the control unit and create a repair order online. Next, send in the well-packed unit, and Airbag24 checks it, replaces defective components, erases the crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days.

This order is for safety: the control unit is only removed once the battery has been disconnected.

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 46479364 get to Airbag24?

You send the 46479364 as a parcel or book a UPS collection for an extra charge. The return after repair is by UPS.

Print out the repair order and put it in the parcel. The unit must be packed to withstand shocks.