Airbag control unit with part number 9666412180

What does the airbag control unit 9666412180 do?

The airbag control unit 9666412180 is responsible for the restraint system (SRS) of Citroën: it evaluates sensor data and, in a crash, triggers the appropriate airbags and seatbelt pretensioners within milliseconds, while continuously monitoring the system. It indicates faults via the airbag warning light.

The components of the system are under constant monitoring; the unit stores anomalies in the fault memory.

After a crash the unit writes crash data and locks itself. Only repair lifts this lock.

Why does the control unit 9666412180 fail?

Crash data from an accident is the most common cause of a defect on 9666412180, even if no airbag has fired. Added to this are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or jump-starting.

A normal diagnostic tool does not erase crash data; Airbag24 handles that as part of the repair.

The other causes come from the electronics and plug connections. Which of them applies is clarified by testing in each individual case.

How can you tell that the 9666412180 is defective?

The airbag warning light signals on the 9666412180 that something is wrong: it lights up in the instrument cluster permanently or intermittently, a fault message appears in the display, the diagnostic tool cannot reach the control unit, and the fault memory cannot be emptied. Airbags and seatbelt pretensioners may then not trigger in an emergency.

A defect is therefore indicated, not hidden. The warning refers to the control unit or the wiring, so testing is necessary.

Reading the fault memory shows which fault is stored.

Which vehicles is the 9666412180 fitted in?

The airbag control unit 9666412180 is fitted in these vehicles: Citroën C3 II Facelift (2013-2017) and II (2009-2013).

The list of vehicles for this part number follows here:

• Citroën C3 II Facelift (2013-2017)
• Citroën C3 II (2009-2013)

Use this page to match the part number on the label of the removed unit; that way you know you have the correct unit. The cause is clarified only by the fault memory, which you have read out beforehand, since it shows whether the control unit is defective or whether a connector or cable is affected.

For the same vehicles, we also repair control units with the part numbers 00006546T7, 618300400, 626181500, 9656888580, 9673657880, 98 038 323 80.

How does the repair of the 9666412180 work?

First have the fault memory of the 9666412180 read and enclose the log. After disconnecting the battery, the control unit is removed; then you create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Once the unit is sent in well packed, it is tested on the test bench at Airbag24 during this time: defective components are replaced and crash data is erased.

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 9666412180 get to Airbag24?

Shipping runs either as a parcel or via a UPS collection booked for an extra charge, which brings the control unit 9666412180 to Airbag24. Return to you after the repair is by UPS.

A printed copy of the repair order goes into the consignment; you protect the unit with shock-proof packaging.