This Airbag Control Unit (SRS Control Module) is designed for Citroën C2, Citroën C3 and Citroën C3 Pluriel models and is commonly referenced by part numbers 9658316580, 654583, 654584 and 654691. The unit monitors crash sensors, manages airbag and seatbelt pretensioner deployment logic and stores SRS fault codes. Ideal for professional workshops and experienced DIY mechanics who search by part number, this control module restores proper Supplemental Restraint System functionality after electrical faults or collisions.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C2; Citroën C3; Citroën C3 Pluriel
• Product Codes: 9658316580; 654583
• Additional Numbers: 654584; 654691

Installation Recommendations

• Safety First: Disconnect the vehicle battery (negative terminal) and wait at least 10 minutes to allow SRS capacitors to discharge before touching airbag system components.
• Follow Service Manual: Remove trim and affected airbags (driver/passenger/side) as required by the factory procedure to access the control unit. Always follow manufacturer wiring and connector release methods to avoid damage.
• Connector Integrity: Inspect wiring harnesses, ground points and connector pins for corrosion or bent contacts. Ensure connectors fully engage and locking tabs click into place.
• Post-Installation: Reconnect battery, then use a compatible diagnostic tool to read and clear SRS fault codes. Verify system status and perform any required calibration or system checks per the service manual.
• Handling: Avoid static discharge and do not subject the unit to impact or high-pressure cleaning. Handle the module with care and mount with original fasteners and correct torque where specified.

Common Failure Causes

• Collision Damage: The most frequent cause is impact from an accident; the unit may register deployment events or internal faults after a crash.
• Moisture And Corrosion: Water ingress or corroded connectors can create intermittent faults or complete failure of communication with sensors.
• Electrical Surges And Poor Grounding: Battery voltage spikes, jump-starts done incorrectly or bad ground connections can damage internal electronics.
• Wiring And Connector Faults: Chafed wiring, damaged pins or poor repairs in the SRS circuit will often trigger faults that appear to be module-related.
• Age And Environmental Stress: While control units are designed to last the vehicle lifetime, prolonged exposure to heat, vibration or contamination can eventually cause malfunction.

Why Choose This Unit: Using the correct SRS control module with matching part numbers ensures compatibility with airbag deployment logic and fault reporting. Searchable by the typical part numbers listed above, this unit helps professionals and competent DIYers restore safety system functionality after diagnostics have identified the control module as faulty.

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.

This airbag control unit (SRS ECU) is a direct-fit safety module suitable for Citroën C2, C3 and C3 Pluriel vehicles. Designed for professional mechanics and experienced DIYers, this unit monitors crash sensors, controls airbag deployment and works with seatbelt pretensioners to protect occupants in a collision. Commonly searched by part numbers 9656889080, 654583, 654584 and 654691, the module is a key safety component for Stellantis vehicles and is often replaced after impact or when SRS fault codes are present.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C2, Citroën C3, Citroën C3 Pluriel
• Product Codes: 9656889080
• Additional Numbers: 654583, 654584, 654691

Function And Benefits

The unit continuously evaluates inputs from accelerometers, impact sensors and seatbelt switches. When a collision threshold is exceeded, it triggers airbag deployment and seatbelt pretensioners. Replacing a faulty or deployed control unit restores correct SRS function and clears persistent airbag warning lights when properly installed and coded. For workshops, having the correct part numbers on hand speeds diagnosis and repair.

Installation Recommendations

• Disconnect the negative battery terminal and wait at least 10 minutes to allow the SRS capacitors to discharge before starting work.
• Locate the unit—typically mounted under the dashboard or center console—remove surrounding trim carefully to avoid damaging connectors and harnesses.
• Unplug connectors using the locking tabs, remove mounting bolts, and replace with the new unit. Ensure all connectors are fully engaged and locking clips are intact.
• After mechanical installation, perform diagnostic checks with a suitable tool (e.g., manufacturer-level scanner such as DiagBox/Lexia or equivalent) to clear fault codes and, if required, program or match the unit to the vehicle.
• Verify SRS lamp extinguishes and run a final check of related systems (seatbelt sensors, airbag circuits). Observe all static-electrical precautions when handling airbag components.

Most Common Failure Reasons

• Crash Deployment: The most frequent reason for replacement is activation during an accident; the unit can store deployment data and often must be replaced afterward.
• Water Ingress And Corrosion: Moisture penetrating the cabin or dashboard area can corrode connectors or internal circuitry, causing faults.
• Electrical Surges Or Short Circuits: Voltage spikes from jump-starts, battery faults or wiring damage can damage internal electronics.
• Connector Damage Or Poor Grounding: Loose, corroded or damaged connectors commonly produce intermittent faults and fault codes.
• Internal Component Failure: Aging components or manufacturing defects can lead to unit malfunction; SRS warning lamp and stored fault codes usually indicate the problem.

This airbag control unit is a safety-critical part. When replacing it, follow manufacturer procedures, use appropriate diagnostic tools for post-installation checks and ensure all repairs restore full SRS functionality before returning the vehicle to service.

This airbag control unit (SRS Control Module) is a direct-fit electronic module intended for Citroën C2, Citroën C3 and Citroën C3 Pluriel. It monitors crash sensors, stores event data and controls airbag and pretensioner deployment during an impact. Mechanics and DIY enthusiasts commonly search by part numbers such as 9651927580 or 654583 — include these codes when looking up compatibility or replacement parts.

Function And Benefits

The unit continuously evaluates inputs from impact sensors, seat-belt buckle switches and airbag cushions to decide if and when to trigger safety devices. A properly functioning control unit ensures timely deployment of airbags and coordinated activation of seatbelt pretensioners, directly affecting occupant protection in a collision. Replacing a faulty unit restores the vehicle’s passive safety reliability and clears SRS fault warnings when combined with correct diagnostic procedures.

How The Part Is Replaced

Replacement should be performed by a trained technician or an experienced DIYer who follows safety rules. Basic steps typically include:

• Disconnect The Negative Battery Terminal And Wait At Least 10 Minutes To Allow Residual Charge To Dissipate.
• Remove Interior Trim Panels To Access The Control Unit (Locations May Vary By Model; Often Mounted Under The Center Console Or Passenger Footwell).
• Unplug Electrical Connectors And Unscrew Fasteners Holding The Module.
• Install The New Unit, Reconnect Connectors And Reassemble Trim.
• Use A Diagnostic Scanner To Clear SRS Fault Codes And Verify Correct System Status. Recalibration Or Coding May Be Required On Some Vehicles.

Replacement Frequency And Typical Fault Causes

Airbag control units are designed to last the vehicle’s life under normal conditions. Common reasons for replacement include damage from a prior collision (unit records crash events or is physically damaged), water ingress or corrosion of connectors, electrical surges, or internal component failure. After an impact the unit may store crash data and must be inspected and often replaced to restore full airbag functionality.

Installation Recommendations

• Always Disconnect The Battery Before Working On The SRS System And Follow Manufacturer Safety Intervals.
• Avoid Static Discharge And Do Not Probe Airbag Connectors With Power Applied.
• Replace Any Damaged Wiring Or Corroded Connectors To Prevent Recurrence Of Faults.
• Perform A Full SRS System Scan After Installation And Clear Stored Faults; Follow Any Reprogramming Or Coding Steps Required For The Vehicle.
• Keep A Record Of The Replaced Part Number For Future Service And Warranty Purposes.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C2; Citroën C3; Citroën C3 Pluriel
• Product Codes: 9651927580, 654583
• Other Numbers: 654584, 654691