Citroën C4 Aircross airbag control unit repair⁽¹⁾

What should I know about Citroën C4 Aircross airbag control units?

The airbag control unit is the central unit that evaluates the crash sensors in the Citroën C4 Aircross and triggers the airbags. If the airbag warning light is on, the system has detected a fault. Airbag24 repairs the control unit you send in from your own vehicle.

In an accident, the control unit triggers the airbags and the belt tensioners and monitors the entire airbag system. If it detects a fault, it reports it via the airbag warning light on the dashboard.

After an accident, the control unit stores crash data and locks itself. In this state a repair is required, and Airbag24 professionally erases the crash data during the repair. Work on the airbag system should be left to a specialist workshop.

Which Citroën C4 Aircross generations are there?

The Citroën C4 Aircross was built from 2012 to 2017. The part numbers and fault codes on this page refer to generation I of this model.

• I (2012–2017) – the generation to which the information on this page refers

Within a generation, the design and equipment can differ depending on the year of manufacture and trim level. Before you send in your control unit, check that the part number and year of manufacture match your vehicle.

How do I identify my Citroën C4 Aircross airbag control unit?

The part number on the label of the control unit determines the exact version. In addition, compare the year of manufacture and the vehicle identification number (VIN) of your Citroën C4 Aircross.

The part number is the most important reference point for the assignment. The control unit for this model comes from the supplier Bosch. The following part numbers are listed for this model, without any claim to completeness:

• 8635A322

Examples of fault codes are B0001 (driver airbag ignition circuit stage 1: resistance too high), C601 (driver airbag ignition module stage 1: open circuit) and F00F (control unit no longer transmits on the CAN network). A single code alone does not prove a defect; it is an indication that a specialist diagnosis should check.

What airbag equipment does the Citroën C4 Aircross have?

According to equipment information for the Australian market, the Exclusive trim level includes driver and passenger airbags, front side airbags, curtain airbags and a driver's knee airbag as standard. Which airbags are fitted to your vehicle depends on market, trim level and year of manufacture.

The front airbags, side airbags and curtain airbags are part of the system that the control unit coordinates. To check whether your Citroën C4 Aircross has this equipment, use the equipment list of your vehicle.

The way to repair: have the fault memory read out and disconnect the battery. Leave removal of the control unit to a specialist workshop, because work on the airbag system does not belong in untrained hands. Create a repair order online and send the control unit in, well packed. Processing usually takes 3–4 working days (checking, repairing, testing). The repaired control unit returns with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.