Airbag control unit with part number 9666181280

What does the airbag control unit 9666181280 do?

The airbag control unit 9666181280 belongs to the restraint system (SRS) of Citroën. It queries the crash sensors, determines within milliseconds in an accident the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

The evaluation needs no operation and runs in the background. If the unit reports a fault, the airbag warning light in the instrument cluster lights up.

As long as there is no fault, you see nothing of the control unit.

Why does the control unit 9666181280 fail?

Main cause: crash data from an accident that remains in the unit, even if no airbags fired; a common diagnostic tester cannot erase it. Alongside this come ageing of the electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data is held in the control unit. A common diagnostic tester reads it out but does not remove it.

Solder joints and plug connections react to ageing and to moisture, so that contacts gradually deteriorate.

A weak battery or jump-starting can produce voltage spikes that stress the electronics.

How can you tell that the 9666181280 is defective?

A fault shows up as the airbag warning light, a fault message, no connection of the diagnostic tool and a fault memory that cannot be erased. In that case airbags and seatbelt pretensioners may not trigger in an emergency.

The signs in detail:

• Warning light in the instrument cluster, permanently or intermittently
• Fault message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be erased

Have a finding checked promptly, so that the cause is established.

Which vehicles is the 9666181280 fitted in?

The control unit 9666181280 is fitted in these vehicles: Citroën C3 II Facelift (2013-2017) and II (2009-2013).

The list of vehicles for this number:

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

Comparing the part number on the label with this page confirms that you have the correct unit in front of you. Before that, have the fault memory read out, because 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 00006546T7, 618300400, 626181500, 9656888580, 9673657880, 98 038 323 80.

How does the repair of the 9666181280 work?

First have the fault memory read out and attach the log; then disconnect the battery and remove the control unit. Then create the repair order online and send the well-packed unit in. Airbag24 then checks it, repairs defective components, erases crash data and carries out a function test.

For checking, repair and testing at Airbag24, expect 3–4 working days as a rule.

Your 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 9666181280 get to Airbag24?

Your unit reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. Airbag24 takes care of the return by UPS after the repair.

Put the printed repair order in the parcel; the control unit goes in shock-resistant packaging.