Airbag control unit with part number 46785005

What does the airbag control unit 46785005 do?

The airbag control unit 46785005 is the control unit of the restraint system (SRS) for Fiat. It processes the signals from the crash sensors, determines within milliseconds in a crash which airbags and seatbelt pretensioners trigger, and monitors the system permanently. It shows faults via the airbag warning light.

The unit runs along during driving and compares incoming values with its specifications. It detects irregularities before the driver notices them, and records them.

After an accident, it stores crash data and locks itself. Keep this state in mind during any work on the unit.

Why does the control unit 46785005 fail?

Most common cause: crash data stored after an accident, even if no airbag has deployed. These cannot be erased with a normal diagnostic tool. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The crash data is the most common cause, because the unit records an accident event and the diagnostic tool cannot overwrite that entry. As a result, the fault remains visible even if the electronics are otherwise healthy.

Aged components and cold solder joints can only become noticeable after prolonged use. Moisture and corrosion on plugs weaken the contact, while voltage spikes add further stress to the circuits.

How can you tell that the 46785005 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and a fault message appears in the instrument cluster. Likewise, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The airbag warning light shows the defect. The fact that you can see it is the decisive point, because the system reports on its own.

If the connection to the diagnostic tool is missing, do not immediately assume a replacement part is needed. The finding lies in the unit or in the line to it, and only the check shows which part it is.

Which vehicles is the 46785005 fitted in?

The control unit 46785005 is fitted in these vehicles: Fiat Stilo 192 Facelift (2003-2006), 192 (2001-2004) and 192 Facelift (2006-2008).

Below you will find the vehicles that are recorded in our documents for this part number.

• Fiat Stilo 192 Facelift (2003-2006)
• Fiat Stilo 192 (2001-2004)
• Fiat Stilo 192 Facelift (2006-2008)

On the one hand, compare the part number on the label of the removed unit with this page. This ensures that you have the right unit in front of you. On the other hand, have the fault memory read out before removal. Only this log shows whether the control unit itself is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 46835521, 46835522, 51709144, 51711815, 51711816, 5WK42969.

How does the repair of the 46785005 work?

Have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next create a repair order online and send in the well-packed unit.

The order protects you during removal. Without the log and a disconnected battery, the control unit is not removed.

Airbag24 tests the unit on the test bench, replaces defective components and erases stored crash data. A function test follows. Processing usually takes 3–4 working days, and this time applies only to checking, repairing and testing at Airbag24. 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 46785005 get to Airbag24?

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

Put the printed repair order into the parcel. Pack the unit shock-resistant.