Airbag control unit with part number 46789398

What does the airbag control unit 46789398 do?

The airbag control unit 46789398 is the central control unit of the restraint system (SRS) for Fiat. It reads the signals from the crash sensors, decides in a crash within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

Reported faults appear via the airbag warning light. After a crash, the unit stores crash data and locks itself.

Why does the control unit 46789398 fail?

The most common cause is stored crash data after an accident, even if no airbag has triggered. A normal diagnostic tool cannot delete it. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

That a plug or a cable produces the same messages as the unit itself does happen. That is why only the fault memory provides clarity.

Voltage spikes can come, for example, from a weak battery or a jump start.

How can you tell that the 46789398 is defective?

A defect shows on the airbag warning light, which stays on permanently or intermittently, and on error messages in the instrument cluster. In addition, 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 possibly not trigger in such a fault. Because the light indicates the finding, a prompt check is the right step.

Which vehicles is the 46789398 fitted in?

Here you can see the vehicles for which this number is stored with us. The 46789398 is fitted in these vehicles: Fiat Marea 185 (1996-1999) and 185 Facelift (1999-2003).

The vehicles are listed in the following list.

• Fiat Marea 185 (1996-1999)
• Fiat Marea 185 Facelift (1999-2003)

Compare the part number on the label of the removed unit with this page to make sure you have the right unit. Also have the fault memory read out beforehand, because only the result shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 46409123, 46475013, 46538652, 46550647.

How does the repair of the 46789398 work?

Have the fault memory read out, attach the log, and disconnect the battery before you remove the control unit. Create a repair order online and send in the well-packed unit. At Airbag24, processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function test. After that, your own unit is 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 46789398 get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shockproof.