Airbag control unit with part number A3C09204200

What does the airbag control unit A3C09204200 do?

The A3C09204200 is the central control unit of the restraint system (SRS) for Citroën and Peugeot. It evaluates the signals from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The control unit reports faults via the airbag warning light in the instrument cluster. The display tells the driver that the system should be checked.

The crash data records what happened during the event and stays stored in the unit. This makes it an important part of the findings during repair.

Why does the control unit A3C09204200 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a standard diagnostic tool cannot erase it. Other possible causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data arises from the event itself, and the record remains even if no airbag has deployed. That is why it comes first as the most common cause.

The other causes mainly affect the electronics and their connections. Ageing, cold solder joints and moisture at the plugs can disturb the contact, while voltage spikes from a weak battery or a jump start put strain on the circuitry.

How can you tell that the A3C09204200 is defective?

A defect shows up as the airbag warning light lighting up permanently or intermittently in the instrument cluster, and as a fault message in the instrument cluster. The diagnostic tool then finds no connection to the control unit, and the fault memory cannot be cleared.

The warning light is the first sign while driving. When it is lit, the restraint system is not in its checked condition.

In an emergency, airbags and seatbelt pretensioners may therefore fail to deploy. An early check brings clarity here.

Which vehicles is the A3C09204200 fitted in?

The A3C09204200 is fitted by Citroën and Peugeot in these vehicles: Citroën Jumpy III (2016-2023) and III Facelift (from 2023); Peugeot Expert III (2016-2024) and III Facelift (from 2024); Citroën SpaceTourer I (2016-2023) and I Facelift (from 2024); Peugeot Traveller I (2016-2024) and I Facelift (from 2024). The assignment applies only to the control unit with this part number.

The known vehicles are listed below:

• Citroën Jumpy III (2016-2023)
• Citroën Jumpy III Facelift (from 2023)
• Peugeot Expert III (2016-2024)
• Peugeot Expert III Facelift (from 2024)
• Citroën SpaceTourer I (2016-2023)
• Citroën SpaceTourer I Facelift (from 2024)
• Peugeot Traveller I (2016-2024)
• Peugeot Traveller I Facelift (from 2024)

Before you send it in, compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. Also have the fault memory read out, because only the result shows whether the control unit 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 9817062880, 9818994480, 9823741280.

How does the repair of the A3C09204200 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. After that, your own unit goes back to you.

The order of these steps is for your safety, because the airbag system must not be worked on without disconnecting the battery first.

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 A3C09204200 get to Airbag24?

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

Pack the control unit shockproof and place the printed repair order in the parcel.