Description
Airbag unit for Citroën C2, C3 and C3 Pluriel vehicles.
The airbag control unit (SRS control module) is a central safety component that monitors crash sensors and controls the deployment of airbags and seatbelt pretensioners. This unit is suitable for Citroën C2, Citroën C3 and Citroën C3 Pluriel models and is commonly referenced under part numbers 9647794180, 654583, 654584 and 654691. Intended for professional mechanics and experienced DIY enthusiasts, this replacement unit restores proper SRS functionality after damage, electrical faults or after a crash event.
Function And Application
The airbag control unit continuously evaluates inputs from impact sensors, seat occupancy detectors and belt buckle switches. When a defined threshold is exceeded in an impact event, the control unit triggers the corresponding airbag and pretensioner deployment to protect occupants. It also stores fault codes in the event of sensor failures or wiring issues, which can be read and cleared with a diagnostic scanner.
How The Part Is Replaced
- Disconnect The Negative Battery Terminal And Wait At Least 10–15 Minutes To Allow SRS Capacitors To Discharge.
- Remove Interior Trim Panels And Center Console As Required To Access The SRS Control Unit.
- Label And Disconnect All Electrical Connectors—Do Not Pull On Wiring.
- Unbolt The Control Unit From Its Mounting, Replace With The New Unit And Secure To Specified Torque.
- Reconnect Electrical Connectors Ensuring Proper Locking Tabs, Reinstall Trim And Reconnect Battery.
- Use A Diagnostic Tool To Read And Clear Fault Codes And Confirm That The SRS System Shows No Active Faults.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Citroën C2 / Citroën C3 / Citroën C3 Pluriel
- Product Codes: 9647794180, 654583
- Other Numbers: 654584, 654691
Installation Recommendations
- Always Isolate The Battery And Observe SRS Safety Intervals To Avoid Unintended Deployment.
- Use Proper Tools And A Diagnostic Scanner To Verify System Status After Installation.
- Inspect Wiring Harnesses, Connectors And Sensor Mounts For Corrosion Or Damage Before Fitting The New Unit.
- Ensure The Replacement Unit Matches The Vehicle Part Numbers Listed Above; Connector Pinouts Must Fit Precisely.
- Torque Mounting Fasteners To Manufacturer Specifications Where Available; Do Not Overtighten Plastic Mounts.
Most Common Cause Of Failure
Failures Typically Result From Water Ingress Or Corrosion Of Connectors, Electrical Surges, Physical Damage During A Collision Or Internal Component Degradation (For Example, Capacitor Or Solder Joint Failures). Units May Also Cease Functioning After Airbag Deployment In A Crash. Regular Moisture Checks And Repair Of Any Damaged Wiring Reduce The Risk Of Premature Failure.
This description Aims To Help Mechanics And Competent DIYers Identify The Correct SRS Control Unit And Understand Key Steps For Safe Replacement. For Fault Diagnosis And Code Clearing Use A Compatible Diagnostic Interface.
