Airbag control unit with part number 9673654980

What does the airbag control unit 9673654980 do?

The airbag control unit 9673654980 controls the airbags and seatbelt pretensioners in Citroën. Via the crash sensors it registers what happens during an impact, and it decides within milliseconds whether to trigger. It also monitors the entire restraint system (SRS) and shows faults via the airbag warning light.

During operation, the electronics continuously check their connections and the supply voltage. This self-monitoring runs regardless of whether the vehicle is standing still or driving.

Once an accident has been registered, the control unit stores crash data and locks itself.

Why does the control unit 9673654980 fail?

The most common cause is crash data that is held in the control unit after an accident, even if no airbag was triggered; a conventional diagnostic tool cannot remove it. Other triggers are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes from weak batteries or jump-starting.

Crash data therefore also arises in accidents where no airbags were triggered.

The other causes come from everyday use of the vehicle. Electronics age, solder joints become brittle, and moisture attacks the contacts. Voltage spikes from a weakened battery or from jump-starting additionally stress the unit.

How can you tell that the 9673654980 is defective?

The airbag warning light in the instrument cluster stays on permanently or comes on intermittently, and the instrument cluster shows an error message. The diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then possibly fail to trigger in an emergency.

The warning light is the signal you notice first. If it does not go out after starting, have the system checked.

A fault memory records the finding. The fault is therefore not resolved just because the light was off for a while.

Which vehicles is the 9673654980 fitted in?

The control unit 9673654980 is fitted at Citroën in these models: Citroën C3 II Facelift (2013-2017) and II (2009-2013). The final check remains the comparison of the part number on the removed unit.

For orientation, the list of vehicles from our database follows.

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

Have the fault memory read out before you disconnect anything. Then compare the part number on the label with this page. The comparison only shows whether the unit fits; whether the control unit itself is defective or a plug or cable is the cause is shown only by the log.

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 9673654980 work?

First you read out the fault memory and attach the log, then you disconnect the battery and remove the control unit. Afterwards you create a repair order online and send the unit off well packed. At Airbag24, the unit usually needs 3–4 working days.

At Airbag24, the unit is checked on the test bench, defective components are repaired, the stored crash data is deleted and the function is tested.

The sequence is binding because it ensures safety 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 9673654980 get to Airbag24?

You send the control unit as a parcel, or you commission a UPS collection for an extra charge. Airbag24 takes care of the return of the repaired unit by UPS.

A printed repair order belongs in the parcel; pack the unit so that it withstands knocks.