Airbag control unit with part number 9807547380

What is the function of the airbag control unit 9807547380?

The airbag control unit with part number 9807547380 is the central control module for the passive safety system in numerous Citroën and Peugeot models. As an OEM component from the PSA Group, often manufactured under the Autoliv brand, it monitors crash sensors, processes their data, and deploys airbags and seatbelt pretensioners in the event of a collision.

It acts as the brain of the entire restraint system. The electronics inside the unit interpret signals from acceleration and pressure sensors to assess the severity of an impact and activate the appropriate safety components within milliseconds.

Without a properly functioning control unit, occupant safety cannot be guaranteed, as airbags would fail to deploy in an emergency. Therefore, its correct operation is critical for vehicle safety.

Why does the control unit 9807547380 fail?

The primary cause of failures in the control unit 9807547380 is internal electronic defects on the circuit board. Common sources of failure include moisture damage, short circuits, or the natural aging of electronic components such as microprocessors and capacitors. These issues often result in specific fault codes that directly indicate an internal device malfunction, disabling the system.

In workshop diagnostics, these units prove particularly susceptible to such hardware problems. Their complex circuitry is sensitive to environmental factors or voltage fluctuations in the vehicle’s electrical system, which can lead to permanent damage to the electronics.

A failure does not always mean the unit is irreparable. Often, individual components on the circuit board can be replaced selectively to restore full functionality.

It is important to note that this control unit is also known under other part numbers. Identical or equivalent variants include 620644600, 62O644600, 9807568180, 624926000, and P23975472 (Autoliv). A defect in any of these numbers typically arises from the same underlying causes.

How do you recognize a defect in the control unit 9807547380?

The most obvious symptom of a defect in the control unit 9807547380 is the continuously illuminated airbag warning light on the instrument cluster. Additionally, the vehicle’s diagnostic memory often stores fault codes explicitly indicating an internal error or malfunction of the control unit itself, enabling targeted diagnosis.

In this case, the airbag warning light does not extinguish even after restarting the engine. This is a clear indication from the system that a critical safety component is not functioning correctly, leaving the occupant protection systems disabled.

When diagnosing with workshop tools like Lexia or Diagbox for PSA vehicles, communication with the airbag control unit may become impossible. The unit fails to respond to requests, which is another strong sign of a severe internal defect.

In which vehicles is the 9807547380 control unit installed?

The airbag control unit 9807547380 is primarily used in a wide range of Citroën models, especially in the C4 series and its derivatives such as the C4 Picasso and SpaceTourer. Due to PSA’s platform strategy, this component can also be found in Peugeot models, for example, the Peugeot 308 II.

At Airbag24, we repair part number 9807547380 as well as identical variants for the following specific models:

Citroën: C4 I (including the 2008–2010 facelift), C4 II (including the 2015–2018 facelift), C4 III, C4 Coupé I, C4 VTS I, C4 Picasso II, Grand C4 Picasso I, Grand C4 Picasso II, C4 SpaceTourer II, C4X III, ë-C4 III, and ë-C4X III.

Peugeot: 308 II (model years 2014–2020).

The widespread use across multiple generations and models underscores the importance of this control unit within the PSA Group. Repairs are available for all listed vehicle models.

How is the 9807547380 professionally repaired?

Professional repair of the 9807547380 at Airbag24 begins with a detailed component-level diagnosis to pinpoint the exact cause of the fault. Defective electronic components, such as microprocessors or capacitors on the circuit board, are then expertly replaced. Following restoration, the unit undergoes a comprehensive functional test to ensure full operational reliability.

Once the defective control unit arrives at Airbag24, technicians examine the circuit board under a microscope. Cold solder joints, corroded traces, or faulty components are identified and precisely repaired. This process restores the original functionality without requiring an expensive new part.

A repair is the most cost-effective solution and often saves 50–70% compared to purchasing a new unit. After repair, it is essential that the control unit be thoroughly tested in the vehicle to ensure proper communication with all sensors and actuators.

For every repair performed, Airbag24 provides 2 years' statutory liability for defects, underscoring the quality and durability of the restoration.