Airbag control unit with part number 9665266180

What does the airbag control unit 9665266180 do?

The airbag control unit 9665266180 controls the restraint system (SRS) of Citroën in the vehicle. It evaluates the crash sensors, selects in a crash within fractions of a second the appropriate airbags and seatbelt pretensioners, and monitors the system continuously. It communicates faults via the airbag warning light.

In a crash, the unit writes crash data and then locks itself.

This combination of sensors, control unit and triggering forms the core of the safety function.

Why does the control unit 9665266180 fail?

The most common cause is crash data from an accident, which can be present even if no airbag triggered; a normal diagnostic tool cannot remove it. In addition there are ageing electronics, cold solder joints, moisture and corrosion on plug connections, and voltage spikes in the vehicle electrical system.

The unit creates the data because it processes the accident. That no airbag triggered afterwards is irrelevant to this.

The other causes relate to ageing and the environment. Electronic components wear out, solder joints can go cold, and moisture causes corrosion on contacts.

Voltage spikes arise, for example, with a weak battery or when a jump start is given. A check of the vehicle electrical system is therefore part of the diagnosis.

How can you tell that the 9665266180 is defective?

A defect can be recognised by an airbag warning light in the instrument cluster that stays on permanently or intermittently, or by a fault message. Add a diagnostic tool that makes no contact with the control unit, and a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may therefore possibly not trigger.

Keep an eye on the light in everyday driving, because it comes on without any action on your part.

No connection to the diagnostic tool does not always lie in the control unit itself. The finding nonetheless belongs to the signs that justify a check.

Which vehicles is the 9665266180 fitted in?

This control unit 9665266180 is fitted in these vehicles: Citroën C5 II 1st Facelift (2010-2012), II (2008-2010) and II 2nd Facelift (2012-2017).

We have compiled the vehicles for this number in the following list.

• Citroën C5 II 1st Facelift (2010-2012)
• Citroën C5 II (2008-2010)
• Citroën C5 II 2nd Facelift (2012-2017)

Before you send the unit in, check the part number on the label so that the correct unit is on its way. Whether the control unit is defective only becomes clear from the fault memory read out beforehand; connectors and cables can also be the cause.

For the same vehicles, we also repair control units with the part numbers 9657456680, 9665266080, 9665558180, 9674290580.

How does the repair of the 9665266180 work?

At the start, the fault memory is read out and its log attached; then you disconnect the battery and remove the control unit. Afterwards you create the repair order online and send the unit in well packed. Airbag24 examines it on the test bench, repairs defective components, erases stored crash data and carries out a function test; processing usually takes 3–4 working days.

The order applies because the restraint system is touched during 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 9665266180 get to Airbag24?

The unit goes to Airbag24 as a parcel, or UPS collects it for an extra charge. After the repair, UPS brings it back to you.

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