Airbag control unit with part number 9810155880

What does the airbag control unit 9810155880 do?

The airbag control unit 9810155880 is the central unit of the restraint system (SRS) of Citroën. It evaluates the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The device shows faults via the airbag warning light. You do not need to operate anything for this.

After an accident, the device stores crash data and locks itself.

Why does the control unit 9810155880 fail?

With the 9810155880, the most common cause is crash data stored after an accident, even if no airbag has deployed.

Other causes that generally come into consideration are:

• aged electronic components
• cold solder joints
• moisture and corrosion on plug connectors
• voltage spikes, for example from a weak battery or a jump start

Whether any of these causes applies only becomes clear when the device is examined.

How can you tell that the 9810155880 is defective?

A defect in the 9810155880 can be recognised by the airbag warning light, which lights up permanently or intermittently. Further signs are fault messages in the instrument cluster, no connection between the diagnostic tool and the control unit, or a fault memory that cannot be cleared.

Such signs are a reason to have the restraint system checked promptly. In an emergency, the airbags and seatbelt pretensioners may not be able to deploy while the fault persists.

The warning light indicates the defect, so an inspection does not first have to track it down.

Which vehicles is the 9810155880 fitted in?

The airbag control unit 9810155880 is fitted in these vehicles: Citroën C5 II 1st Facelift (2010-2012), II (2008-2010) and II 2nd Facelift (2012-2017).

Our data lists these vehicles for this number:

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

Compare the part number on the label of the removed unit with this page to make sure it is the right unit. Have the fault memory read out beforehand, because only the log shows whether the control unit itself is the cause or a plug or cable is.

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

How does the repair of the 9810155880 work?

For the repair of the 9810155880, first read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components and carries out a function test. Afterwards, your own unit is sent back to you.

The 3–4 working days relate only to checking, repairing and testing at Airbag24. The sequence before that is binding for safety reasons.

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 9810155880 get to Airbag24?

You send the control unit 9810155880 to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Pack the unit shockproof and enclose the printed repair order.