Description
Airbag Control Unit AUTOLIV For CITROËN XSARA PICASSO Fully Functional
This Autoliv airbag control unit (SRS ECU) is a direct-fit safety module for Citroën Xsara Picasso vehicles. It monitors crash sensors, manages airbag deployment and seatbelt pretensioners, and stores crash-related fault codes. Commonly searched by its product numbers, this unit is suitable for professional auto technicians and experienced DIYers who service PSA group vehicles. Replacement of a faulty SRS ECU restores airbag system diagnostics and deployment capability when done following manufacturer procedures and with the correct diagnostic equipment.
Technical Information
- Manufacturer: Autoliv
- Model: Citroën Xsara Picasso
- Product Codes: 9650137080, 602327400
- Additional Numbers: 6556RA, NFP
Function And Application
The airbag control unit continuously monitors input from impact sensors, seat occupancy sensors and seatbelt pretensioner circuits. When a crash of sufficient severity is detected, the unit triggers deployment of the appropriate restraint devices. It also logs crash events and fault codes, which are used by diagnostic tools to verify system integrity after repair.
Installation Recommendations
- Always disconnect the vehicle battery before beginning work and wait at least 3–10 minutes to allow capacitors to discharge. Follow the vehicle manufacturer’s safety procedures to avoid accidental deployment.
- Access the unit following the vehicle’s repair manual. Remove interior trim panels carefully to avoid damaging wiring or connectors.
- Unplug electrical connectors and remove mounting fasteners. Keep connectors clean and free of corrosion; inspect wiring harness for damage before installing the replacement unit.
- Fit the unit using original mounting positions and torque values specified by the manufacturer. Reconnect connectors securely and reassemble trim components.
- After installation, clear crash data and SRS fault codes with an appropriate diagnostic tool and verify that the airbag warning lamp extinguishes. It is recommended that initialization and final checks be performed with PSA-compatible diagnostic equipment.
Most Common Failure Reasons
Airbag control units typically fail for one of the following reasons: deployment during a collision (the unit records crash data and must be replaced), water ingress or corrosion of connectors, electrical damage from shorts or battery incidents, or internal electronic faults due to age or prior abuse. Fault codes, illuminated airbag warning lamp, or loss of communication with the SRS system are common indicators of a failing unit.
Replacement Interval And Practical Notes
There is no scheduled replacement interval for SRS control units. Replace the unit if it has recorded a deployment event, if persistent fault codes cannot be cleared, or if it shows signs of electrical damage. After replacement, perform a full system check and clear all stored errors with a diagnostic scanner. Because of the safety-critical function, final verification is recommended to be carried out by a trained technician.
Search Tips: Many mechanics and DIY users look up this part by product code 9650137080 or 602327400 and by vehicle model Citroën Xsara Picasso. Including these numbers in searches increases the chance of finding the correct unit.
