Airbag control unit with part number 98 252 770 80

What is the function of the airbag control unit 98 252 770 80?

The airbag control unit with part number 98 252 770 80 is the central safety module in the Citroën C3 Aircross II. It processes signals from impact sensors and determines whether and which restraint systems, such as airbags, should be deployed. This component is also known under the OEM numbers A2C98794709 and 9660731780.

As the brain of the passive safety system, this control unit continuously monitors all connected components. These include the various crash sensors distributed throughout the vehicle, the airbag modules themselves, and the seatbelt pretensioners.

In the event of a collision, the unit analyzes incoming sensor data within milliseconds and makes the critical decision to activate the system. It precisely controls, supervises, and triggers the necessary safety features to provide optimal protection for occupants.

Why does the control unit 98 252 770 80 fail?

The most common cause of failure for the control unit 98 252 770 80 is permanently stored crash data following an accident, which prevents further use. Other typical defects include electronic malfunctions—often caused by water damage—as well as physical issues such as damaged wiring or loose connectors.

After a crash, the control unit writes so‑called crash data into its internal memory. For safety reasons, this data locks the unit and cannot be erased using standard diagnostic tools. Professional repair is required to reset the unit.

Electronic malfunctions due to moisture or water ingress can also lead to complete failure. Additionally, mechanical causes like broken cables or corroded connectors may disrupt communication with sensors or airbags, resulting in operational faults.

How do you recognize a defect in the control unit 98 252 770 80?

The clearest indication of a defect in the control unit 98 252 770 80 is the SRS warning light that remains steadily illuminated or flashes on the instrument panel. This signals a serious fault in the restraint system, meaning the airbags might not deploy in an emergency. An immediate visit to a workshop is essential.

The airbag or SRS indicator light serves as a direct warning to the driver that the system has detected a malfunction during self‑diagnosis. Ignoring this warning poses a significant safety risk, as occupant protection is no longer guaranteed.

When reading the fault memory at a workshop, error codes often appear, pointing to an internal fault within the control unit or faulty communication with other components. In such cases, the control unit is usually the most likely source of the problem.

In which vehicles is the control unit 98 252 770 80 installed?

The airbag control unit with part number 98 252 770 80 is specifically used in vehicles manufactured by Citroën. It is the standard control unit for the Citroën C3 Aircross II model range. Airbag24 offers professional repair services for this component in the corresponding models.

At Airbag24, we repair the control unit 98 252 770 80, as well as its equivalent variants A2C98794709 and 9660731780, for the following specific vehicle models:

Citroën C3 Aircross II (model years 2017–2021)

Citroën C3 Aircross II Facelift (model years 2021–2024)

How does the repair of the control unit 98 252 770 80 proceed?

The repair process at Airbag24 begins with a precise diagnosis of the submitted control unit. Specialized mechatronics engineers analyze the root cause of the fault, reset stored crash data, and resolve any electronic issues. Following successful repair and final testing, the unit is returned ready for installation, backed by 2 years' statutory liability for defects.

Once the removed control unit arrives at Airbag24, technicians subject it to a systematic inspection. First, the fault memory is read using a diagnostic tool to verify the reported defect and identify additional potential sources of trouble.

The core of the repair often involves erasing crash data stored after an accident and restoring the control unit to its original condition. During this process, all relevant memory modules are professionally handled to fully restore functionality.

If a repair proves impossible—for example, due to severe water damage—we assess the availability of a remanufactured replacement control unit. Each repair concludes with a comprehensive final test to ensure proper operation.