Description
Overview
Used but fully functional Autoliv airbag ECU (Electronic Control Unit) for the Citroën Xsara Picasso. This SRS control unit manages airbag deployment timing, monitors crash sensors and pretensioners, and stores fault codes that are essential for accurate diagnostics. It’s a direct replacement option for original units carrying the part numbers listed below and is aimed at professional mechanics and competent DIY technicians.
How the Unit Works
The ECU continuously monitors input from impact sensors, seat belt sensors and other SRS components. In a crash event it decides whether to trigger airbags and pretensioners and logs crash data for diagnostics. A correctly functioning unit is critical to ensure the vehicle’s passenger protection system operates as designed.
Common Failure Modes and Causes
Typical reasons to replace the airbag ECU include electrical faults, corrosion or water ingress, damage from a previous collision, or age-related electronic component failure. Symptoms often include an illuminated SRS/airbag warning lamp, stored fault codes, or a non-responsive airbag system detected during diagnostics.
Installation And Service Notes
Installation should be performed by a qualified technician or an experienced DIYer familiar with SRS systems. General replacement steps:
- Read and record SRS fault codes with a capable diagnostic tool before removal.
- Disconnect the vehicle battery and follow the vehicle manufacturer’s recommended waiting period to allow residual power to dissipate.
- Remove required trim panels and unbolt the control unit from its mounting.
- Carefully unplug all connectors, avoiding damage to locking tabs and wiring.
- Install the replacement unit, reconnect all plugs, secure the unit and reassemble interior trim.
- Clear stored SRS fault codes and perform a full system scan. On some PSA vehicles a diagnostic tool may be required to finalise initialization or reset procedures.
Safety note: Working on airbag systems can be hazardous. Always follow the vehicle manufacturer’s service manual and recommended safety procedures.
Why Replace the ECU?
Replacing a faulty airbag ECU restores the airbag system’s ability to detect and respond to collisions correctly. This unit is suitable when the original module shows persistent faults, post-accident damage, or when diagnostics indicate the control unit is the source of the SRS malfunction.
Technical Information
Manufacturer: AUTOLIV
Model: Citroën Xsara Picasso
Product Codes: 9652276980, 9650137080, 602327400, 6556RA
Additional Numbers: Not available
Who Should Buy This Part
This Autoliv airbag ECU is intended for automotive professionals and experienced DIY mechanics working on Citroën Xsara Picasso vehicles. It’s a practical and cost-efficient option to restore SRS functionality when the original control unit is faulty.
Order Information
If you are searching by part number, this unit matches common PSA airbag ECU references including 9652276980, 9650137080, 602327400 and 6556RA. Purchase to restore SRS diagnostics and passenger safety systems on compatible vehicles.
