Airbag control unit with part number 46849152

What does the airbag control unit 46849152 do?

The airbag control unit 46849152 is the central control unit of the restraint system (SRS) for Fiat. It evaluates the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and reports faults via the airbag warning light.

The electronics work without delay here, because triggering has only a very short time available. At the same time, the control unit monitors the system continuously during operation.

After an accident, it stores crash data and locks itself. More on this is found in the following sections.

Why does the control unit 46849152 fail?

Most often the cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase them. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data arise from the event itself and remain in the memory afterwards. Reading out with a standard tool does not remove them, and the fault memory stays unchanged.

The other causes affect the electronics themselves. Components age, solder joints can turn cold, and moisture attacks the contacts. Voltage spikes, for example from a weak battery or a jump start, also stress the circuit.

How can you tell that the 46849152 is defective?

The airbag warning light in the instrument cluster lights up on the 46849152 permanently or intermittently. Added to this are an error message in the instrument cluster and a diagnostic tool that cannot establish a connection to the control unit.

The fault memory cannot be cleared either. Signs like these mean that airbags and seatbelt pretensioners may not deploy in an emergency, and the warning light shows this directly.

Have these signs checked promptly to determine the next steps.

Which vehicles is the 46849152 fitted in?

The control unit 46849152 is fitted in these vehicles: Fiat Idea 350 (2004-2005) and 350 Facelift (2005-2008).

The vehicles known to us for this unit:

• Fiat Idea 350 (2004-2005)
• Fiat Idea 350 Facelift (2005-2008)

On the one hand, compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. On the other hand, have the fault memory read out beforehand. Only this result shows whether the control unit itself is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 51716748, 51752040, 51760853, 51816902, 51816903, 51816904.

How does the repair of the 46849152 work?

First you read out the fault memory and enclose the log. Then you disconnect the battery and only then remove the control unit 46849152; next you create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The 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 46849152 get to Airbag24?

You can send the control unit 46849152 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

The printed repair order goes into the parcel, and you pack the unit shock-proof.