Description
Airbag control unit for CITROËN C5 II vehicles — 7x airbags plus pyrotechnic seatbelt pretensioners. Fully functional.
This airbag control module (SRS control unit) is a direct-fit replacement intended for Citroën C5 II models equipped with seven airbags and pyrotechnic seatbelt pretensioners. It is commonly searched by product numbers 9658177080 and 603481900, so technicians and DIY enthusiasts often find this part by its reference codes. The control unit monitors crash sensors, decides airbag deployment, activates pretensioners during severe impacts, and stores crash event data and fault codes.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C5 II (Second Generation)
- Product Codes: 9658177080, 603481900
- Additional Numbers: 6545V0, 6545V1, NFP
Function And Benefits
The airbag control unit continuously evaluates inputs from accelerometers, impact sensors, seat occupancy sensors and belt buckle switches. When crash thresholds are met, it triggers targeted airbag deployment and belt pretensioners to reduce occupant movement. A properly functioning control unit is critical for occupant safety and airbag system readiness.
How It Is Replaced
Typical replacement steps for experienced technicians or competent DIYers (follow manufacturer procedures):
- Disconnect the vehicle battery and wait sufficient time for system capacitors to discharge.
- Access the unit (location may vary by equipment level; commonly in the center tunnel under the center console or beneath the front seats depending on model and trim).
- Remove trim and fasteners securing the control unit.
- Carefully unplug connectors and remove the unit. Inspect connectors and wiring for damage or corrosion.
- Install the replacement unit, reconnect connectors, refit fasteners and trim, then reconnect the battery.
- Clear SRS fault codes and confirm system status using an SRS-capable diagnostic tool (DiagBox, Lexia or equivalent).
Installation Recommendations
- Always Disconnect the Battery Before Working On The SRS System And Follow Manufacturer Procedures To Avoid Damage Or Unintended Deployment.
- Handle The Unit And Airbag Connectors Carefully; Avoid Static And Mechanical Damage.
- Inspect Wiring Harness And Ground Points For Corrosion Or Damage; Repair As Needed Before Installing The New Unit.
- After Installation, Use An SRS-Capable Diagnostic Tool To Clear Codes And Verify System Integrity.
- If The Vehicle Has Undergone A Collision, Verify That All Sensors And Seatbelt Pretensioners Have Been Replaced Or Repaired According To Manufacturer Guidelines.
Why This Part Most Commonly Fails
- Crash Event: Unit May Be Damaged Or Locked After Airbag Deployment During An Accident.
- Water Ingress Or Corrosion: Moisture Can Cause Connector And Circuit Damage Leading To Faults.
- Electrical Surges Or Short Circuits: Battery Jumps, Improper Jump-Starts Or Wiring Faults Can Damage Electronics.
- Connector Damage Or Poor Grounding: Faulty Harnesses Or Loose Grounds Cause Intermittent Or Permanent Failures.
- Software Or Memory Corruption: Rare But Possible After Severe Electrical Events.
This listing is optimized for technicians and competent DIY mechanics who search by product number or vehicle model. The control unit supplied matches the referenced codes and is suitable for Citroën C5 II vehicles configured with seven airbags and pyrotechnic pretensioners. Always follow safety procedures when working with SRS components.
