Description
Autoliv Airbag Control Unit For Citroën Xsara Picasso Vehicles.
This Autoliv airbag control unit (SRS ECU) is a direct-fit replacement option for Citroën Xsara Picasso models commonly referenced under part numbers 9652276980, 9650137080, 602327400 and marking 6556RA. The unit Manages Airbag Deployment Logic, Monitors Crash Sensors And Stores Crash Event Data. It Is A Critical Safety Component Designed To Interpret Signals From Impact Sensors And Trigger Airbags And Seatbelt Pretensioners When Required.
Fitment And Application
Compatible With Citroën Xsara Picasso Models. Frequently Searched By Part Numbers 9652276980, 9650137080, 602327400, 6556RA. Ideal For Professional Workshops And Experienced DIY Enthusiasts Performing Srs Repairs Or Module Replacement.
How The Unit Works
The Airbag Control Unit Continuously Monitors Input From Impact Sensors, Seat Occupancy Sensors (If Fitted) And Seatbelt Pretensioner Circuits. When A Crash Event Exceeds Predefined Thresholds, The Unit Issues Deployment Commands To The Relevant Restraint Devices. The Module Also Records Diagnostic Fault Codes And Crash Memories That Must Be Addressed After Any Collision.
Replacement Procedure (Overview)
- Park Vehicle On Level Surface, Engage Handbrake.
- Disconnect Battery Negative Terminal And Wait At Least 10 Minutes To Allow Capacitors To Discharge.
- Follow Manufacturer Fastener Locations To Access The Unit (Usually Under Passenger Seat Or Central Dash Area Depending On Year/Specification).
- Remove Electrical Connectors Carefully, Avoiding Damaged Locks Or Pins.
- Install Replacement Unit In Reverse Order, Ensure Correct Connector Seating And Secure Mounting.
- After Installation, Clear Fault Codes And Crash Memory Using A Compatible Diagnostic Tool. Verify SRS Indicator Behavior And Perform Full System Check.
Technical Information
- Manufacturer: Autoliv
- Model: Airbag Control Unit For Citroën Xsara Picasso
- Product Codes: 602327400, 9652276980, 9650137080, 6556RA
- Other Numbers: 9650137080 | 9652276980 | 602327400 | 6556RA
Installation Recommendations
- Always Disconnect The Battery Before Starting Work And Observe A Waiting Period To Discharge Residual Energy.
- Use Proper Torque Values And Manufacturer Fastening Procedures To Avoid Mechanical Stress Or Poor Grounding.
- Check Connector Pins For Corrosion Or Damage; Replace Damaged Clips Or Wiring As Needed.
- After Fitting, Use A Diagnostic Tool Compatible With PSA Vehicles (DiagBox/Lexia) To Clear Crash Memory, Read Srs Faults And Confirm System Integrity.
- If The Old Unit Shows Crash Memory, Do Not Reuse It Without Proper Clearing And Verification — Many Modules Require Resetting Or Replacement After Deployment.
Why This Part Fails Most Often
Airbag Control Units Typically Become Nonfunctional After A Collision Because They Record And React To Crash Events; Once Deployed, The Unit Often Must Be Replaced. Other Common Causes Include Water Ingress And Corrosion From Moisture, Electrical Surges Or Short Circuits, Damaged Wiring Or Connectors, And Mechanical Damage From Improper Handling. Environmental Degradation Over Many Years Can Also Lead To Intermittent Faults Which Trigger The SRS Warning Light.
Symptoms Of A Faulty Unit
- Srs/Airbag Warning Light Permanently Illuminated Or Intermittent.
- Recorded Crash Memory Preventing Airbag System Reset.
- Malfunction Of Seatbelt Pretensioners Or Airbag Deployment Circuits.
- Multiple Srs Fault Codes Present In Diagnostic Readout.
Replacement Of The Airbag Control Unit Should Be Performed By A Trained Technician Or An Experienced Diy Mechanic Comfortable With Safety Procedures. Proper Diagnostic Equipment Is Required To Ensure The System Is Restored To Full Operational Condition.
