Description
Airbag control unit for Citroën C2, C3 and C3 Pluriel
This SRS/Airbag control unit is a direct-fit module used on small Stellantis platform vehicles such as the Citroën C2, Citroën C3 and C3 Pluriel. It is commonly searched for by part numbers and OE codes—making it easy to find when you work from an error code or parts list. Designed for mechanics and experienced DIYers, this listing highlights compatibility, typical failure modes and practical installation guidance to help you complete the repair efficiently.
Key Features & Benefits
- OE Reference Numbers Included: Facilitates fast matching to vehicle parts lists and service documentation.
- Direct Replacement: Fits factory wiring and connectors on listed Citroën models—no modifications required when matching OE codes.
- Essential For Vehicle Safety Systems: Controls deployment decisions for airbags and stores crash event data (event memory), ensuring the SRS system operates as intended.
- Suitable For Professional Workshops And Competent DIYers: Useful for SRS fault diagnostics and post-collision module replacement.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot Group)
- Model: Citroën C2, Citroën C3, Citroën C3 Pluriel
- Product Codes: 9647794180
- Additional Numbers: 654583, 654584, 654691
How The Unit Works
The airbag control unit (SRS control module) monitors inputs from crash sensors, seat occupancy sensors and belt pretensioners. When the module detects a collision above its deployment thresholds, it triggers the appropriate restraint devices. It also stores diagnostic trouble codes (DTCs) and crash event data that must be addressed after any deployment or water/electrical fault.
Common Reasons For Failure
- Collision/Deployment: The module is often replaced after airbag deployment—once triggered it usually requires replacement.
- Water Ingress or Corrosion: Moisture entering the unit or connector can cause fault codes and loss of functionality.
- Electrical Faults Or Short Circuits: Wiring damage, shorts or improper jump-starting can damage the control electronics.
- Connector Or Wiring Damage: Poor connections, pin corrosion, or chafed wiring cause intermittent faults or permanent failure.
Replacement And Installation Recommendations
- Safety First: Always disconnect the negative battery terminal and wait at least 10–15 minutes before working on SRS components to reduce the risk of accidental deployment. Use appropriate personal protective equipment.
- Locate The Module: On Citroën C2/C3 models the SRS unit is typically mounted under trim panels—commonly beneath the center console or in the passenger footwell/under-seat area depending on year and trim. Refer to vehicle repair manual for exact location.
- Handle With Care: Avoid static discharge and mechanical shock to the unit. Do not probe live connectors with the battery connected.
- Diagnostics Required: After replacement, clear SRS fault codes and verify system status with a suitable diagnostic tool (factory-level or compatible PSA/Diagbox tools). Confirm no pending crash-related faults remain before returning the vehicle to service.
- Connector Check: Inspect wiring, pins and connectors for corrosion or damage and repair as needed to prevent repeat failures.
Who Should Install
Installation is recommended for qualified automotive technicians or experienced DIYers comfortable with vehicle electrical systems and SRS safety procedures. Proper diagnostic equipment is required to verify functionality and clear codes.
Why Buy This Unit
Purchasing a correct OE-matching airbag control unit ensures proper integration with restraint systems and simplifies fault diagnosis. Using the correct part numbers reduces installation time and helps restore the vehicle’s safety systems to factory operation.
