Description
Airbag Control Unit for CITROËN C5 II
The Airbag Control Unit (SRS/Restraint ECU) specifically designed for Citroën C5 II is an essential safety module that monitors crash sensors and controls deployment of airbags and pretensioners. Supplied with the referenced part numbers, this unit is suitable for professional workshops and skilled DIY mechanics looking for a direct replacement ECU. The description includes key part codes to help with fast searches and accurate fitment: 9657456680, 603481900, 6545V0, 6545V1.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5 II (Second Generation)
- Product Codes: 9657456680, 603481900, 6545V0, 6545V1
- Additional Numbers: May Be Cross-Referenced With Other Stellantis Part Numbers — Check Listed Codes
Function And Application
The Airbag Control Unit is the vehicle’s crash detection brain. It continuously monitors inputs from accelerometers, impact sensors, seat occupancy sensors and seatbelt pretensioner circuits. In the event of a collision, the ECU evaluates sensor data and triggers appropriate restraint devices (front and side airbags, pretensioners). It Also Stores Fault Codes And Event Data Which Can Explain Deployment Or Malfunction Events.
Compatibility And Fitment
Designed For Citroën C5 II models using the supplied part numbers. The unit may be used in other Stellantis vehicles that share the same Airbag ECU part numbers; always verify the Product Codes Above Against The Vehicle’s Parts List Before Installation.
Installation Recommendations
- Disconnect The Battery And Wait Sufficient Time For Capacitors To Discharge (Typically At Least 10 Minutes) Before Starting Work.
- Follow Manufacturer Removal Procedure: Remove Required Trim Panels To Access The Module (Common Locations Are Under The Center Console, Under The Passenger Seat Or Behind The Glovebox Depending On Trim).
- Handle The Unit And Connectors With Care To Avoid Static Damage. Use Proper ESD Precautions If Available.
- After Fitting, Clear Fault Codes And Perform Self-Checks Using A Professional Diagnostic Tool Capable Of Reading SRS Systems.
- When Reconnecting The Battery, Verify That All Airbag And SRS Warning Lights Behave Correctly; Do Not Drive With An Active SRS Warning Light.
Most Common Causes Of Failure
- Deployment After A Crash: Units That Have Recorded An Airbag Deployment Will Require Replacement Or Reprogramming According To Manufacturer Rules.
- Water Ingress Or Corrosion: Moisture Reaching The ECU Or Connectors Can Cause Malfunctions Or Intermittent Faults.
- Electrical Surges Or Incorrect Jump-Starting: Voltage Spikes Can Damage Internal Electronics.
- Connector Damage Or Wiring Faults: Poor Grounding Or Frayed Wiring May Generate SRS Faults.
Practical Tips For Workshop Technicians
Always Document SRS Fault Codes Prior To Replacement. If The Vehicle Has Been Involved In A Collision, Inspect All Associated Wiring, Sensors And Seatbelt Pretensioner Circuits. Use An Appropriate Diagnostic Tool To Verify The New Unit’s Self-Test Results After Installation.
Replacement Frequency
Airbag Control Units Do Not Have A Scheduled Replacement Interval. They Are Replaced After A Confirmed Malfunction, After Airbag Deployment, Or When Persistent Fault Codes Indicate Internal Failure. Proper Diagnostic Check Determines Necessity.
Why Choose This Unit
Including Clear Part Numbers And OEM References In The Listing Helps Speed Up Parts Search And Ensures Correct Fitment For The Citroën C5 II. Ideal For Mechanics Who Require Accurate Identification And Fast Replacement Of Safety-Critical Modules.
