Airbag control unit with part number 46859299

What does the airbag control unit 46859299 do?

In the vehicle, the airbag control unit 46859299 takes over control of the restraint system (SRS) for Fiat and Opel. It evaluates the crash sensors, determines in an accident which airbags and seatbelt pretensioners are triggered within milliseconds, and monitors the system continuously. It reports faults via the airbag warning light.

It processes the sensor inputs continuously, even when no accident occurs.

Crash data is stored after an accident, whereupon the unit locks itself.

Why does the control unit 46859299 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 erases it during the repair.

The other causes affect the electronics themselves. Components age, solder joints can go cold, and moisture or corrosion attack the connectors. Voltage spikes put additional strain on the unit.

How can you tell that the 46859299 is defective?

The first sign is usually the airbag warning light in the instrument cluster, which stays on permanently or intermittently. A fault message in the instrument cluster, no connection to the diagnostic tool and a fault memory that cannot be cleared are further signs. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The warning light shows the defect itself, so you do not need to wait for measurements. The sooner you have the restraint system checked, the better.

Which vehicles is the 46859299 fitted in?

The control unit 46859299 is fitted in these vehicles: Fiat Ducato 250 2nd Facelift (2014-2024), 250 (2006-2011), 250 3rd Facelift (from 2023) and 250 1st Facelift (2011-2014); Opel Movano C (from 2021). It is advisable to check whether your car is among them before removal.

For an overview, here is the list of vehicles:

• Fiat Ducato 250 2nd Facelift (2014-2024)
• Fiat Ducato 250 (2006-2011)
• Opel Movano C (from 2021)
• Fiat Ducato 250 3rd Facelift (from 2023)
• Fiat Ducato 250 1st Facelift (2011-2014)

First compare the part number on the label of the removed unit with this page, so that you know for certain it is the matching unit. Also have the fault memory read out before you remove anything. Only this log shows whether the control unit 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 00046858203, 00046858205, 00046859296, 00046859297, 00046863930, 01356790080.

How does the repair of the 46859299 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Next you create a repair order online and send the packed unit. At Airbag24 it is checked on the test bench, defective components are repaired, stored crash data is erased and a function test is carried out.

Processing at Airbag24 normally takes 3–4 working days. Afterwards you receive your own unit back.

The order of steps in the vehicle is fixed, because the battery must be disconnected before removal.

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 46859299 get to Airbag24?

You send the unit as a parcel or book UPS collection for an extra charge. Returns after the repair are made by UPS.

Enclose the printed repair order and pack the control unit so that it withstands impacts.