Product Overview

This airbag (SRS) control unit is a direct-fit replacement for Citroën C5 II models equipped with seven airbags and pyrotechnic seatbelt pretensioners. Supplied with reference numbers 9659532380 and 603481900 (also listed under 6545V0 / 6545V1 / NFP), the unit is aimed at professional mechanics and experienced DIYers who need a reliable SRS module that restores full occupant protection and fault-free airbag system operation.

Compatibility

Designed For: Citroën C5 II (Second Generation). Suitable For Vehicles Fitted With 7 Airbags And Pyrotechnic Seatbelt Pretensioners. Searchable By OEM Numbers 9659532380, 603481900, 6545V0, 6545V1.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C5 II
• Product Codes: 9659532380, 603481900
• Other Numbers: 6545V0, 6545V1, NFP

Installation Recommendations

Always Follow Safety Procedures When Working With SRS Components. Before Any Work, Disconnect The Vehicle Battery And Wait The Manufacturer-Specified Time To Allow Capacitors To Discharge. Locate The Airbag Control Unit (Location Varies By Trim And Equipment Level), Remove Interior Trim Panels Carefully, Unplug Connectors And Unbolt The Module.

Handle The Unit And Connectors With Care To Avoid Damage Or Contamination. After Mechanical Installation, Use A Suitable Diagnostic Tool (OEM-Level Where Possible) To Read And Clear Fault Codes, Verify Sensor Status, And Confirm System Readiness. Do Not Attempt To Repair Pyrotechnic Devices Or Inflators Yourself.

Replacement Procedure (General Steps)

1. Disconnect Negative Battery Terminal And Wait The Recommended Interval.
2. Remove Interior Trim To Access The SRS Control Unit.
3. Unplug Electrical Connectors And Remove Fasteners Holding The Unit.
4. Install The Replacement Unit, Secure Fasteners, And Reconnect Plugs.
5. Reconnect Battery, Use Diagnostic Scanner To Clear Crash Memory, Reset Airbag Indicators, And Verify No Stored Faults Remain.

Why Failures Occur

• Water Ingress Or Corrosion Causing Connector Or Circuit Damage.
• Electrical Surges, Short Circuits, Or Poor Grounding Leading To Electronic Failure.
• Crash Events That Cause Airbag Deployment And Lock The Control Module.
• Physical Damage From Improper Removal/Installation Or Interior Work.
• Long-Term Heat, Vibration, Or Manufacturing Defects Affecting Electronics.

Notes For Mechanics And DIYers

This Unit Is Particularly Useful When An Airbag Module Needs Replacing But The Vehicle Has No History Of Airbag Deployment. Because Airbag Control Units Store Crash And Deployment Data, Proper Diagnostic Clearing And System Verification Are Essential After Installation. If Any Airbag Or Pretensioner Has Been Deployed Previously, Additional Component Replacement And System Initialization Will Be Required.

Why Choose This Unit

Clear OEM Reference Numbers And Direct Compatibility Make This Airbag Control Unit Easy To Find And Fit. It Offers A Cost-Effective Way To Restore Full SRS Functionality On Citroën C5 II Vehicles When SRS Faults Point To The Control Module.

This airbag (SRS) control unit is intended for Citroën C5 II vehicles and manages deployment of seven airbags together with seatbelt pretensioners. Designed for professional workshops and experienced DIY mechanics, the unit is supplied with the original part numbers commonly searched in catalogs and by technicians. Replacing the SRS control unit restores the vehicle’s passive safety functions after a fault or crash-related deployment and is a critical repair that should be followed by diagnostic verification.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C5 II (Second Generation)
• Product Codes: 9658177080; 603481900
• Other Numbers: 6545V0; 6545V1; NFP

Compatibility And Application

Primary fitment: Citroën C5 II (second generation). The unit uses Stellantis/PSA part references listed above and may be interchangeable with vehicles on the same platform that share these part numbers. Always confirm fitment by matching part numbers before installation.

Function

The SRS control unit continuously monitors crash sensors, seat occupancy sensors and belt buckle switches. In the event of a collision it evaluates sensor inputs and triggers deployment of airbags and activation of pyrotechnic seatbelt pretensioners to reduce occupant injury. It also stores fault codes in its memory when sensors or circuits report errors, illuminating the airbag warning lamp on the instrument cluster.

How Replacement Is Performed

Typical replacement steps (summary for experienced technicians):

• Disconnect the vehicle battery and allow sufficient time for the SRS capacitors to discharge (follow manufacturer-recommended waiting time).
• Remove required interior trim or seat components to access the SRS control unit mounting location.
• Unbolt the unit, carefully release the multi-pin connectors and remove the module.
• Install the replacement unit in the original orientation, reconnect connectors and secure mounting bolts to specified torque.
• Reconnect the battery, then use a compatible diagnostic tool to read and clear SRS fault codes and to verify that the airbag warning lamp extinguishes after successful initialization.

Installation Recommendations

• Always disconnect the negative battery terminal before starting work and wait the recommended time to avoid accidental deployment.
• Handle the unit and connectors with care; avoid pulling on wiring and protect connectors from contamination.
• Use a PSA-compatible diagnostic tool (or equivalent capable SRS scanner) to perform post-installation checks, clear stored faults and confirm system readiness.
• If unsure about access or coding, have the replacement performed by a qualified technician with SRS experience.

Why This Part Most Often Fails

Common causes of SRS control unit failure include:

• Crash Deployment: After airbag deployment the unit records events and typically must be replaced.
• Moisture Ingress Or Corrosion: Water damage or corroded connectors can cause faults or complete failure.
• Electrical Surges Or Short Circuits: Battery jumps, incorrect wiring or other electrical issues may damage internal electronics.
• Connector Or Wiring Damage: Physical damage to harnesses or pins leads to intermittent faults and warning lights.
• Age‑Related Component Failure: Internal electronic components can degrade over long service life.

Because the SRS unit is a safety-critical component, proper installation and diagnostic verification are essential to restore full functionality.

This activated airbag (SRS) control unit is a direct-fit replacement for Citroën C5 II vehicles and is commonly searched for by its OEM numbers. It’s suitable for professional workshops and experienced DIY mechanics who require a reliable unit to restore the vehicle’s restraint system after an incident or when diagnosing SRS faults. Including the OEM part numbers in the listing increases findability in search engines and helps you match the unit to the vehicle quickly.

Function And Fitment

The airbag control module (SRS unit) monitors crash sensors and decides when to deploy airbags and seatbelt pretensioners. It stores event and crash data (so-called CRASH data) and fault codes related to the restraint system. After a collision, the module may retain crash data that must be cleared or reinitialized before the vehicle’s SRS warnings are reset. This unit is intended for Citroën C5 II applications; compatibility with other models depends on matching OEM numbers listed below.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C5 II
• Product Codes: 9657456680
• Additional Numbers: 603481900, 6545V0, 6545V1

Installation Recommendations

• Disconnect the negative battery terminal before starting work and wait the recommended time to allow residual charge to dissipate (typically 10–15 minutes) to avoid accidental deployment.
• Locate the unit according to the vehicle repair manual (common mounting locations include under the centre console or beneath the front seats depending on trim and chassis).
• Handle the module carefully: avoid impact, moisture and electrostatic discharge. Protect connectors and wiring during removal.
• Document connector positions and mounting hardware. Remove securing bolts and electrical connectors cleanly; do not force seized plugs.
• After installation, clear SRS fault codes and, if required, clear CRASH data or reinitialize the module using a suitable diagnostic tool. Verify the SRS system status and perform a post-installation system check.
• For safety-critical systems like airbags, professional installation or validation with a qualified diagnostic device is recommended.

Most Common Failure Reasons

• Crash activation — the most frequent reason the unit is replaced is after an accident when the module records CRASH data.
• Water ingress and corrosion — moisture can damage the electronics or connectors, leading to faults.
• Electrical surges or poor grounding — battery issues, jump-starts or wiring faults can damage the unit.
• Connector damage or wiring harness faults — poor contacts produce intermittent SRS warnings.
• Age-related electronic component degradation — while uncommon, prolonged exposure to harsh environments can cause failures.

Replacement Notes

When fitting this unit, ensure OEM numbers match the vehicle requirements. After physical replacement, use a diagnostic tool to clear crash data and confirm the system shows no active SRS faults. If CRASH data is present, appropriate clearing or reprogramming may be required before the airbags and seatbelt pretensioners will function normally.

This listing includes the most commonly searched part numbers to help you find the correct airbag control unit quickly. Always follow the vehicle manufacturer’s safety procedures when servicing restraint systems.

Overview

This airbag control unit (SRS module) is designed for Citroën C5 II vehicles and is commonly referenced by part numbers 9657456680, 603481900, 6545V0 and 6545V1. The module monitors crash sensors and controls the deployment of airbags and seatbelt pretensioners. It stores crash events and fault codes, and when a fault is present the airbag warning lamp on the instrument cluster will illuminate, indicating that the SRS system requires attention.

Why This Part Matters

A correctly functioning airbag control unit is essential for occupant safety. In the event of a collision, the module evaluates sensor inputs and issues deployment commands within milliseconds. Replacing a faulty or deployed unit restores the vehicle’s ability to protect occupants in a subsequent accident and clears persistent SRS fault indications.

How It Fails

• Deployment After A Collision: The most common reason for replacement is activation during an accident—after deployment the module typically requires replacement or reprogramming.
• Water Ingress And Corrosion: Moisture from leaks (sunroof, door seals) or flooded vehicles can corrode connectors and internal circuitry, causing faults.
• Electrical Damage: Voltage spikes from jump-starts, poor battery connections or short circuits can damage internal electronics.
• Connector Or Wiring Faults: Damaged pins, loose connections or broken wiring to crash sensors and restraints can generate persistent SRS errors.

Replacement And Installation

Replacement of the airbag control unit should follow safe SRS handling procedures. Typical replacement steps used by experienced technicians:

• Disconnect The Vehicle Battery And Wait At Least 10 Minutes To Allow Residual Energy To Discharge.
• Remove Interior Trim Panels To Access The SRS Module (Usually Located Under The Center Console Or Seat Base Depending On Model And Trim).
• Unplug Electrical Connectors Carefully, Noting Locking Tabs And Pin Orientation.
• Remove Mounting Fasteners And Extract The Module.
• Install The New Module, Reconnect All Connectors Securely And Refit Trim.
• Perform Post‑Installation Checks With An SRS‑Capable Diagnostic Tool: Clear Fault Codes, Verify Sensor Status And Ensure The Airbag Warning Lamp Extinguishes After Initialization.

Recommendations For Installation

• Use An SRS‑Capable Diagnostic Tool To Read And Clear Faults And To Verify System Integrity After Installation.
• Observe Electrostatic Discharge Precautions And Handle The Unit By Its Housing—Avoid Touching Contacts Directly.
• Always Disconnect The Battery Before Starting Work And Follow The Manufacturer’s Safety Procedures To Prevent Accidental Deployment.
• If The Module Was Replaced Due To A Crash, Inspect All Airbag Components, Seatbelt Pretensioners And Crash Sensors; Replace Any Components That Have Deployed Or Been Damaged.
• Where Required, Have Coding, Initialization Or Sensor Calibration Performed Using An Approved Diagnostic System By A Qualified Technician.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C5 II (Second Generation)
• Product Codes: 9657456680, 603481900, 6545V0, 6545V1
• Additional Numbers: 603481900 | 6545V0 | 6545V1 | 9657456680

Common Symptoms Indicating Module Fault

• Permanent Illumination Of The Airbag Warning Lamp On The Dash.
• Intermittent SRS Warnings Or Stored Crash Data/Memory Errors.
• After A Collision, Airbags Do Not Reset Or System Reports Deployment Status.

Why The Part Is Often Searched By Part Number

Airbag units are frequently identified and ordered by their OEM part numbers (9657456680, 603481900, 6545V0, 6545V1) to ensure correct fitment and compatibility with vehicle wiring and sensor calibration. Searching by these codes increases the chance of matching the exact module variant used in the Citroën C5 II.

Reason For Failure — Summary

In short, SRS modules usually require replacement after activation in a crash, or when damaged by water, corrosion, or electrical faults. Ensuring dry, secure electrical connections and careful handling during repairs reduces the likelihood of premature failure.

Note For Professionals And DIYers

This description is intended for professional mechanics and experienced DIYers familiar with SRS systems. If you are unsure about any step of the replacement, use appropriate diagnostic equipment and safety procedures or consult a qualified technician.

Product Overview

This airbag control unit is a core safety module for the Citroën C5 II. It monitors crash sensors and decides on the deployment of up to seven airbags and associated pyrotechnic seatbelt pretensioners. For professional workshops and experienced DIY mechanics looking for a replacement or spare module, this unit is offered with the product codes listed below and is suitable where the same part numbers are used across Stellantis platforms.

Why Choose This Unit

• Direct-fit replacement for vehicles using the listed product codes.
• Handles deployment logic for multiple airbags and pretensioners, ensuring occupant protection in a crash event.
• Important for safety restoration after an accident; may require erasing stored crash (CRASH) data and proper initialization.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C5 II (Second Generation)
• Product Codes: 9659532380, 603 48 19 00, 6545V0, 6545 V0, 6545V1, 6545 V1
• Additional Numbers: 6545V0 | 6545V1 | 9659532380

Compatibility Notes

Primary fitment is Citroën C5 II. The same hardware is sometimes used across Stellantis group vehicles (Citroën/Peugeot) where the product codes match. Always verify the part number against the vehicle’s installed unit when replacing.

Installation Recommendations

• Work Should Be Performed By A Qualified Technician Or An Experienced Mechanic: Airbag systems are safety-critical.
• Safety First: Before starting, disconnect the negative battery terminal and allow residual power to dissipate (manufacturers commonly recommend waiting several minutes) to avoid accidental deployment.
• Handle With Care: Avoid impact, strong shocks or exposure to moisture. Protect electrical connectors and mounting points during installation.
• Connector Procedure: Carefully release locking tabs on airbag connectors; do not force pins. Ensure correct seating and secure locking clips on reassembly.
• Post-Installation: After mechanical installation, erase CRASH memory and run the appropriate diagnostic and initialization procedures using suitable PSA diagnostic tools where required.
• Refer To The Workshop Manual For Exact Location And Fastening Torques: The unit location and removal steps may vary by equipment level and model year (commonly located under the center console or behind interior trim panels).

Most Common Reasons For Failure

• Crash Deployment: The module records crash events and may lock or require data clearing after airbag deployment.
• Electrical Damage: Short circuits, wiring faults, or improper jump-starting can damage the control electronics.
• Corrosion Or Water Ingress: Moisture entering connector areas or the module body can cause malfunction.
• Previous Repair Damage: Mechanical impact, improper handling or incorrect repairs can impair functionality.
• Internal Memory/CRASH Data Lock: After a collision the unit often stores crash data that must be cleared and properly re-initialized before reuse.

What To Expect After Replacement

Once installed and any stored crash data has been cleared, run a full system scan with a compatible diagnostic tool to confirm sensor integrity and absence of fault codes. Ensure all airbag indicators on the instrument cluster are extinguished and that no residual faults remain.

Additional Notes

This item is offered with the product identifiers supplied. Exact functionality and state are described as provided; CRASH memory erase or further initialization may be necessary depending on the unit’s history. Use appropriate diagnostic equipment and follow Citroën workshop procedures when handling safety restraint system components.