Description
BSI Control Unit SIEMENS For Citroën And Peugeot Vehicles.
This is a used Siemens BSI control unit designed for selected Citroën and Peugeot models. Ideal for professional workshops and experienced DIY mechanics looking to replace a faulty comfort module. Commonly referenced under codes such as 9650584580, S118085320 B and variants 6580P1 / 6580P2 / 6580L3 / 6580FP / 6580GV.
Product Overview
The BSI (Built‑in Systems Interface) is the central comfort and body control module on many Citroën and Peugeot vehicles. It manages functions such as central locking, interior lighting, windshield wipers, power windows, alarm and convenience features, as well as communication with other control units. Replacing a defective BSI restores proper operation of these systems and eliminates intermittent electrical faults, false alarms or complete loss of convenience functions.
Technical Information
- Manufacturer: Siemens
- Model: BSI E01-00
- Product Codes: 9650584580; S118085320 B; 6580P1; 6580P2; 6580L3; 6580FP; 6580GV
- Other Numbers: S118085320B (alternative notation)
Compatibility
Typical compatible models include Citroën Berlingo, Citroën Xsara Picasso, Peugeot 206 and Peugeot Partner. Use of the correct product code is the usual way to find a matching unit for the vehicle.
Installation And Replacement Notes
Replacement requires careful handling and electrical isolation. Typical steps: disconnect the battery, remove trim panels to access the BSI (usually located behind the dashboard or under the steering column), unplug connectors, remove mounting fasteners and fit the replacement unit. Reconnect connectors, secure the module and reassemble the interior. Final checks should include verifying all controlled circuits and performing any required coding or initialization.
Mounting And Coding – Important
- The unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
- Options For Commissioning:
- Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
- Virginization And Subsequent Initialization/Telecoding Via DiagBox (Or Online) + Key Adaptation.
- Recommended To Be Performed By A Specialist With PSA Service Equipment (DiagBox/Lexia/PP2000).
- Always Disconnect The Battery Before Removal/Installation And Follow Manufacturer Procedures To Avoid Damaging The Unit.
Installation Recommendations
Perform the replacement in a dry, static‑free environment. Inspect and clean all connectors and wiring for corrosion before reconnection. If transferring immobilizer data is required, use cloning tools or perform proper initialization with DiagBox/Lexia/PP2000. After installation, verify central locking, lighting, wipers and other comfort functions. If you are not experienced with vehicle electronics or coding, have the final commissioning done by a workshop with PSA diagnostic tools.
Why This Part Fails Most Often
BSI units commonly fail due to water ingress and corrosion from leaks or high humidity, voltage spikes and poor battery connections, degraded solder joints or capacitors inside the module, and connector corrosion. External faults such as short circuits in wiring or faulty peripheral components can also overload the BSI and cause malfunctions. Symptoms include intermittent electrical behaviour, blown fuses, non‑functioning central locking or lights, and communication errors with other control units.
