Description
BSM B4 Siemens Citroën Peugeot for vehicles Citroën C2, C3, Berlingo, Xsara, Xsara Picasso and Peugeot 206, 307, 406, Partner. This is a used part with a functional warranty. Some mounting clips may be damaged – this does not affect functionality.
Product Overview
The BSM B4 (Body System Module) manufactured by Siemens is the central comfort and body electronics control unit used on a range of Stellantis Citroën and Peugeot models. Commonly referenced by product codes such as 9650618380 and related numbers, this module manages multiple vehicle functions and is a frequent replacement item in workshop repairs. Ideal for professional mechanics and experienced DIY enthusiasts, this unit restores proper operation of body electrical systems without the expense of a new original part.
Functionality
The BSM Coordinates Several Body Electrical Functions Including:
- Central Locking And Remote Lock/Unlock Functions
- Interior And Exterior Lighting Circuits
- Power Windows And Window Safety Features
- Wipers And Intermittent Wiper Control
- Alarms, Horn, And Other Comfort/Convenience Outputs
Typical Reasons For Failure
This Module Can Fail Due To A Few Common Causes:
- Water Ingress Or Moisture Leading To Corrosion On Connectors Or PCB Tracks
- Electrical Surges Or Short Circuits Affecting Internal Components
- Wear From Age And Thermal Cycling Causing Component Drift Or Breakage
- Damaged Or Broken Mounting Clips (Mechanical Damage May Occur During Removal/Installation)
- Poor Grounding Or Corroded Earth Points Causing Intermittent Faults
Replacement And Installation
Replacing The BSM Is Straightforward For A Trained Technician Or Competent DIYer. General Steps:
- Locate The Module In The Vehicle (Usually Mounted In Or Near The Central Fuse Panel/Under The Dashboard).
- Disconnect The Battery Before Starting Work To Avoid Short Circuits And Protect Electronics.
- Remove Interior Trim Or Fuse Box Cover To Access The Unit. Carefully Release Connector Clips Without Pulling On Wiring.
- Unplug Electrical Connectors, Remove Mounting Screws Or Clips, And Replace With The New Unit. Note That Some Clips May Be Damaged And Can Be Replaced Separately.
- Reinstall Connectors Securely, Refit Covers, Reconnect Battery And Test All Affected Functions (Locks, Lights, Windows, Wipers).
Depending On Vehicle Configuration, The Replacement Unit May Require Adaptation Or Coding With PSA Diagnostic Tools (DiagBox/Lexia/PP2000) To Restore Certain Configured Features. If You Are Unsure, Have A Specialist With The Appropriate Diagnostic Equipment Complete The Finalization.
Installation Recommendations
- Always Disconnect The Battery Before Removing Or Installing The Module.
- Use Appropriate ESD Precautions When Handling Electronic Modules.
- Inspect Connectors And Wiring For Corrosion Or Damage; Clean Or Repair As Needed Before Fitting The New Unit.
- Replace Broken Mounting Clips To Ensure The Module Is Securely Fastened.
- After Installation, Verify All Body Functions And Clear Any Related Fault Codes With A Diagnostic Tool.
Technical Information
- Manufacturer: Siemens
- Model: BSM B4
- Product Codes: 9650618380-00, 9650618380
- Additional Numbers: T118470004, L 6500Y3, 6500Y1
Why This Part
This Used BSM B4 Offers A Cost-Effective Solution To Restore Body Electrical Functions On A Range Of Citroën And Peugeot Vehicles. It Is Supplied With A Functional Warranty And Is A Practical Choice For Workshops And Savvy DIYers Who Need A reliable replacement part quickly. Presence Of Minor Cosmetic Damage To Mounting Clips Does Not Affect Electrical Performance.
