Airbag control unit with part number 9673580380

What is the function of Airbag Control Unit 9673580380?

The Airbag Control Unit 9673580380 is the central control module of the Supplemental Restraint System (SRS) in certain Citroën models, such as the C4. It continuously analyzes data from crash sensors and is responsible for precisely and rapidly deploying airbags and seatbelt pretensioners in the event of a collision. A malfunction can disable the entire safety system.

As the “brain” of the passive safety system, this control unit processes signals from acceleration and yaw rate sensors to assess the severity of an impact.

Based on this analysis, it makes the critical decision about which restraint systems need to be activated. Failure of this component poses an immediate threat to occupant safety, as airbags will no longer deploy in a real‑world crash.

Why does Control Unit 9673580380 fail?

The most common cause of failure for Control Unit 9673580380 is stored crash data following a collision, which locks the unit. Internal electronic faults—such as defective components on the circuit board—are also frequent. Less often, water damage or wiring issues lead to complete failure.

After a crash, so‑called crash data is permanently recorded in the control unit’s memory. This is a manufacturer‑imposed safety measure that locks the device and requires replacement. However, professional repair can safely erase this data.

Electronic malfunctions are another major cause. Defective components like capacitors or board defects can impair functionality and trigger internal error messages. These hardware issues prevent proper processing of sensor data.

External factors, such as water ingress, can also cause severe damage through corrosion. Broken wires, loose connectors, or improper wiring may further result in communication errors between the control unit and other vehicle components.

How do you recognize a fault with 9673580380?

A faulty Control Unit 9673580380 primarily manifests as the SRS airbag warning light remaining constantly illuminated or flashing on the instrument cluster. Often, no communication can be established with the control unit via an OBD diagnostic tool. Consequently, all airbags and seatbelt pretensioners in the vehicle become deactivated.

The most noticeable sign is the illuminated SRS warning light, clearly indicating to the driver that there is a fault in the restraint system and that safety is no longer guaranteed. Immediate inspection at a workshop is essential.

Another clear symptom is loss of communication: if a diagnostic tool cannot connect to the airbag control unit or reports specific error codes indicating an internal fault, this strongly suggests a hardware issue within the unit itself.

In which models is Control Unit 9673580380 installed?

The Airbag Control Unit with part number 9673580380 is specifically fitted in various generations of the Citroën C4, including the C4 II, C4 III, and C4 Picasso I. Airbag24 offers professional repair services for all these vehicle models, restoring full functionality to the safety system.

At Airbag24, we repair this control unit for the following Citroën series:

Citroën C4 II (model years 2010–2015) and the facelifted version (2015–2018)

Citroën C4 III (model years 2020–2024)

Citroën C4 Picasso I (model years 2006–2010) and its facelifted version (2010–2013)

Is repairing 9673580380 worthwhile?

Repairing Control Unit 9673580380 is the most cost‑effective solution, saving up to 80% compared to purchasing an expensive new part directly from the manufacturer. You receive a fully functional, tested component backed by 2 years’ statutory liability for defects, without the need for time‑consuming reprogramming of the vehicle. This saves both time and additional workshop expenses.

Rather than investing heavily in a new unit and its programming, refurbishment provides a quick and reliable alternative. The original vehicle data remains intact, making reinstallation straightforward.

How does Airbag24 repair 9673580380?

At Airbag24, Control Unit 9673580380 undergoes a standardized repair process. Following an initial inspection to identify the fault, repairs are carried out at the component level, replacing defective electronics and securely erasing stored crash data. A final functional test ensures full performance, backed by 2 years’ statutory liability for defects.

Once the removed control unit arrives at Airbag24, a comprehensive diagnosis is performed, examining not only the customer‑reported issues but also identifying any potential weaknesses throughout the entire device.

Subsequently, the repair is carried out by qualified technicians. They replace defective electronic components and reset the device’s memory to erase crash data. Following the repair, the control unit undergoes an extensive functional test to ensure it meets the manufacturer’s specifications.

We provide 2 years' statutory liability for defects on every repair performed.