Product Overview

This used Airbag Control Unit (Airbag ECU) manufactured by Autoliv is intended for Citroën Xsara Picasso vehicles. The unit monitors crash sensors and controls deployment of airbags and seatbelt pretensioners. Ideal for workshops and experienced DIY mechanics looking to replace a faulty or crash-damaged airbag controller. Commonly searched by OE numbers such as 9650137080 and 602327400 — include these codes when searching to improve compatibility match.

Function and Symptoms

• Primary Function: Continuously monitors impact sensors, evaluates crash severity and triggers airbags/pretensioners when required. Stores fault codes related to the airbag system.
• Common Symptoms of a Faulty Unit: Persistent airbag warning light on the dashboard, stored crash or communication errors in fault memory, intermittent faults that clear and return, or total lack of communication with diagnostic tools.
• After a Deployment: Units that have recorded an airbag deployment may store crash data and often require replacement rather than simple reset.

Fitment

Fits: Citroën Xsara Picasso (models equipped with Autoliv airbag systems). Check the OE/product codes listed below to confirm mechanical and electrical compatibility with the vehicle’s harness and connector layout.

Technical Information

• Manufacturer: Autoliv
• Model: Citroën Xsara Picasso
• Product Codes: 602327400, 9650137080
• Other Numbers: 6556RA, NFP, (N68)

Installation Recommendations

• Always disconnect the vehicle battery and wait the manufacturer-recommended time before starting to work on the airbag system to avoid accidental deployment.
• Locate the unit (typically under the center console or beneath the passenger/dash area depending on model year) and carefully disconnect all electrical connectors. Take photos of connector positions to aid reassembly.
• Remove mounting fasteners and install the replacement unit in the original orientation. Ensure connectors are clean, dry and fully engaged.
• After installation, clear stored fault codes with a suitable diagnostic tool and verify system readiness. If the airbag light remains on, inspect wiring, sensors and grounding points before replacing the unit again.
• Replacement and any required initialization should be carried out by a qualified technician if you are not experienced with restraint systems — incorrect handling can be dangerous.

Why This Part Most Commonly Fails

• Collision Damage: Impact events can trigger deployment or damage internal circuitry, leaving the unit nonfunctional or storing unrecoverable crash data.
• Water Ingress and Corrosion: Moisture reaching connectors or the unit body can cause corrosion, short circuits or intermittent faults.
• Electrical Surges or Poor Grounding: Voltage spikes, jump-starting errors or bad grounds may damage the ECU electronics.
• Connector/Wiring Damage: Physical wear, rodent damage or poor repairs can break signal lines between sensors and the control unit.

Notes for Mechanics and DIYers

When sourcing a replacement, match OE/product codes (602327400, 9650137080, 6556RA) to ensure connector and functionality compatibility. Treat airbag ECUs as safety-critical components: follow service manual instructions and safety precautions strictly. This unit is supplied as described: fully functional.

This steering wheel airbag is a direct-fit replacement commonly searched under part numbers 96447629ZL and 4112FN. Designed for professional workshops and experienced DIYers, the unit restores driver frontal restraint function after removal or replacement of the original airbag. Clear, well-structured technical data and installation guidance below help you complete the job safely and efficiently.

Key Features

• Direct fit for specified Citroën Xsara and Xsara Picasso models (pre-2003).
• Original part numbers referenced: 96447629ZL, 4112FN (NFP flagged in some records).
• Intended As Steering Wheel Driver Airbag Module — designed to work with Vehicle SRS System.
• Suitable For Mechanics And Competent Self-Repairers Familiar With SRS Safety Procedures.

Function

The steering wheel airbag is a key component of the Supplemental Restraint System (SRS). In the event of a qualifying frontal impact, the module rapidly inflates to help reduce driver injury by cushioning the head and chest. The airbag integrates with the vehicle crash sensors and SRS control unit to deploy only under specified conditions.

Why The Part Most Often Fails

• Deployment During A Collision: Once deployed, the airbag must be replaced — the inflator and cushion are single‑use.
• Connector Or Wiring Damage: Corroded or damaged clockspring (spiral cable) connectors can interrupt the circuit and trigger SRS faults.
• Previous Improper Handling: Incorrect removal or electrical shorting during work on the steering column can damage the module or its connectors.
• Environmental Damage: Moisture ingress or contamination in the steering column area may lead to corrosion and poor electrical contact.

Replacement Procedure (Overview)

Recommended For Experienced Technicians Or Confident DIYers With Proper Tools.

• Safety First: Always Disconnect The Negative Battery Terminal Before Starting Work And Wait At Least 10 Minutes For The SRS Capacitors To Discharge (Or Follow The Vehicle Manufacturer’s Specified Interval).
• Access: Remove Steering Column Trims To Access The Airbag Fasteners — On Many Xsara Models The Airbag Is Secured From The Rear Of The Wheel With Retaining Bolts Or Clips.
• Disconnect: Carefully Release Airbag Electrical Connectors (Clockspring/Spiral Cable Connectors). Use Appropriate Tools And Avoid Pulling On Wiring.
• Fit New Unit: Position The Replacement Airbag, Reconnect The Electrical Plugs, And Secure Fasteners To Manufacturer Specification.
• Reassembly And Checks: Refit Trim Panels, Reconnect The Battery, And Perform A Full SRS System Check With A Diagnostic Scanner To Clear Any Fault Codes And Verify Proper System Operation.
• Torque And Alignment: Ensure Steering Wheel Nut/Torque Settings And Wheel Alignment/Clock Position Are Reinstated Per Manufacturer Procedure.

Installation Recommendations

• Always Follow The Vehicle Manufacturer’s Procedures And Torque Specifications.
• Disconnect The Battery Before Demounting And Keep Terminals Isolated During Work.
• Handle The Airbag Module With Caution — Store With The Cover Facing Up And Avoid Impacting The Unit.
• Inspect The Clockspring/Spiral Cable And Steering‑Column Wiring Harness; Replace If Any Damage Or Excessive Wear Is Found.
• After Installation, Use A Compatible Diagnostic Tool To Reset SRS Faults And Confirm System Readiness.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën Xsara; Citroën Xsara Picasso (up to 2002)
• Product Codes: 96447629ZL, 4112FN, NFP
• Additional Numbers: 4112FN

Notes For Professionals

Parts Like Steering Wheel Airbags Are Integral To Vehicle Safety. Replacement Should Be Performed By Technicians Familiar With SRS Systems. After Any Airbag Replacement, Verify That The SRS Warning Lamp Is Not Indicating A Fault. If SRS Fault Codes Persist, Use A Diagnostic Scanner To Read And Clear Codes And Follow The Vehicle Repair Manual For Further Troubleshooting.

Warranty And Part Identification

Customers Often Search By Part Number (96447629ZL, 4112FN). Verify Correct Part Fitment By Cross‑Referencing These Codes Against The Vehicle Model And Build Year Before Ordering.

Overview

This Airbag Control Unit (SRS ECU) manufactured by Autoliv is designed for the Citroën Xsara Picasso. Commonly searched by part numbers 602327400, 9659111980 and 6556RA, this unit monitors crash sensors and controls deployment of airbags and seatbelt pretensioners to ensure occupant safety. The description and codes make it easy for mechanics and DIY enthusiasts to find the correct replacement quickly.

Why This Unit Matters

The airbag control unit is the central element of the vehicle restraint system. It continuously evaluates input from crash and seat sensors and decides whether to trigger airbag inflation during an impact. Besides triggering, it stores crash event data and system fault memories which are required for proper diagnostics after an incident. Replacing a faulty or deployed unit is critical for restoring full occupant protection.

How To Replace (General Guide)

Replacement should be performed by an experienced technician or a competent DIYer familiar with SRS systems. Typical replacement steps:

• Disconnect the vehicle battery and wait at least 2 minutes to allow residual system energy to dissipate (follow manufacturer recommendations).
• Locate the airbag control unit (commonly mounted in the passenger compartment; locations vary by specification — under the center console or secured to the body structure behind trim panels).
• Remove necessary trim and fasteners to access the unit, then disconnect electrical connectors carefully — avoid bending pins and clean any corrosion.
• Fit the replacement unit, secure fasteners to the correct torque, reconnect connectors and reassemble trim.
• Use a diagnostic tool to clear SRS fault codes, verify system communication and perform any required initialization. If the unit has crash data or deployment history, it will not restore protection until the issue is resolved and proper replacement procedures are followed.

Installation Recommendations

• Always disconnect the battery before starting work and follow the vehicle manufacturer’s service procedures to avoid accidental deployment or damage to the unit.
• Inspect connector pins and wiring harness for corrosion or damage; repair any poor contacts before installing the new unit.
• After fitting, verify system status with a suitable diagnostic scanner capable of reading SRS data and clearing fault memories. Confirm no persistent faults remain and perform a road test as per workshop procedures.
• Keep track of part numbers when ordering; many mechanics search by the original codes (602327400 / 9659111980 / 6556RA) to ensure correct fitment.

Common Causes Of Failure

• Deployment During A Collision — Once airbags deploy, the control unit typically requires replacement.
• Water Ingress Or Corrosion — Moisture reaching the unit or connectors can cause malfunctions and intermittent faults.
• Electrical Surges Or Short Circuits — Battery issues or faulty wiring can damage internal electronics.
• Connector Damage Or Poor Contacts — Vibration, loose connections or pin corrosion lead to communication errors and SRS warnings.
• Age And Environmental Stress — Long-term exposure to heat, humidity and vibration can degrade components over many years.

Technical Information

• Manufacturer: Autoliv
• Model: Citroën Xsara Picasso
• Product Codes: 602327400, 9659111980, 6556RA
• Additional Numbers: 602327400 | 9659111980 | 6556RA

Notes For Mechanics And DIYers

This unit is intended for use in the Citroën Xsara Picasso SRS system. Ensure you have the correct part numbers when replacing the module. After installation, a diagnostic check is mandatory to confirm correct operation. If the vehicle shows an SRS warning lamp after replacement, re-check connections and scan for stored fault codes to guide troubleshooting.

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.

Part of the KPSA series, this airbag unit is compatible with Citroën and Peugeot vehicles. With product codes 550893100, 9646757180, and 8216S2, it is essential for maintaining your car’s safety systems. Regular checks and timely replacement of the unit can prevent failures and ensure optimal functioning.

Changing the airbag unit typically involves disconnecting the vehicle’s battery, removing the old unit, and carefully installing the new one. It is advisable to consult a professional mechanic if you are not confident in performing the replacement yourself.

Technical Information

• Manufacturer: AUTOLIV
• Model: Citroën Xsara Picasso
• Product Codes: 550893100, 9646757180, 8216S2
• Additional Numbers: N/A