The BSM B3 (Body System Module) manufactured by Siemens is an essential body control unit for many Citroën and Peugeot models. This unit centralizes multiple electrical functions such as lighting circuits, wiper control, central locking, power windows and monitored fuses. Supplied as a used, tested-for-functionality module with visible mounting wear possible, it is often searched by its part number 9643498880 or alternative codes 9643498880-00 / T118470003 / 6500Y3.

Technical Information

• Manufacturer: Siemens
• Model(s): Citroën Berlingo, Citroën C2, Citroën C3, Citroën C3 Pluriel, Citroën C5, Peugeot 206, Peugeot Partner
• Product Codes: 9643498880, 9643498880-00, T118470003
• Other Numbers: 6500Y3

Compatibility And Identification

Technicians and DIYers commonly find this BSM by entering its part number (9643498880) or one of the variants above. The unit fits a range of PSA-platform vehicles from Citroën and Peugeot listed in the Technical Information. Always compare product codes printed on the original module when replacing electrical control units.

Function And Symptoms

The BSM B3 coordinates many body electrical systems. Typical symptoms of a failing BSM include intermittent or complete loss of central locking, nonfunctional indicators or interior lights, erratic wiper operation, blown circuits, or multiple electrical faults appearing simultaneously. Because the BSM aggregates numerous functions, failures are often felt as multiple unrelated issues.

Replacement Procedure

• Always Disconnect The Battery Before Starting Work To Avoid Short Circuits Or Damage To The Unit.
• Locate The Unit—typically mounted under the dashboard or behind trim panels near the central fuse box or passenger footwell. Exact location depends on model and year.
• Remove Trim Panels And Any Obstructing Parts Carefully To Access The Module.
• Unscrew Fastenings And Carefully Disconnect Electrical Connectors. Note Connector Positions For Reassembly.
• Install The Replacement Module, Reconnect Connectors, Refit Fastenings And Trim, Then Reconnect The Battery.
• After Installation, Verify Functions Such As Central Locking, Lights, Wipers And Window Operation. If Any Function Remains Faulty, Check Fuses, Grounds And Connector Contacts.

Recommendation For Installation

Perform Replacement In A Clean, Dry Environment. Inspect Connectors For Corrosion And Clean Contacts If Necessary. Use Correct Tools And Torque For Fastenings. When diagnosing, start with fuses and grounds before replacing the module. If you have diagnostic equipment, read stored fault codes to narrow faults to wiring, sensors or the BSM itself.

Why This Part Commonly Fails

Common Causes Of BSM Failures Include Moisture Ingress And Corrosion, Electrical Overloads Or Voltage Spikes, Thermal Stress From Long-Term Use, And Poor Connector Contacts. Physical Damage To Mounting Tabs May Occur During Previous Repairs Or Removal, But Cosmetic Damage To Brackets Does Not Affect Electrical Functionality.

Notes For Professional Use

This unit is supplied used with a functional warranty. It is popular among professional mechanics and skilled DIY enthusiasts as a cost-effective replacement for malfunctioning body control modules. Search By Part Number 9643498880 For Fast Identification On Parts Databases And Catalogues.

This used but fully functional Body Systems Manager (BSM) unit is designed for Citroën C5, Xsara, Xsara Picasso, and Peugeot 307 vehicles. While there may be minor cosmetic damage on some mounting brackets, this does not affect the module’s performance or reliability.

BSM units play a crucial role in managing and monitoring various electronic systems within your vehicle, including engine control and operational systems. Ensuring the proper function of these systems is essential for maintaining safe and comfortable driving. Common failures can arise due to electrical faults or wear over time, making replacement of a faulty BSM a key step in restoring your vehicle’s optimal operation.

This Siemens BSM B3 unit offers an effective and affordable solution for mechanics and DIY enthusiasts seeking to repair or maintain their vehicles’ electronic control systems. Installation is straightforward, typically involving unplugging the old module and securing the replacement in place, with no complex programming required in many cases.

Technical Information

• Manufacturer: Siemens
• Model Compatibility: Citroën C5, Citroën Xsara, Citroën Xsara Picasso, Peugeot 307
• Product Codes: 9650618480, 6500Y3, 6500Y1
• Additional Numbers: 9650618480-00 T118470003 L

Invest in this reliable Siemens BSM B3 module to ensure your vehicle’s electronic control systems perform smoothly and efficiently. Ideal for automotive professionals and car owners handling their own repairs.