Description
BSI Control Unit SIEMENS For Citroën And Peugeot Vehicles
Product Overview
This Siemens BSI control unit (E01-00) is designed for use in selected Citroën and Peugeot models, commonly referenced under part numbers 9653667580 and S118085320. It controls a wide range of body and comfort functions such as central locking, interior lighting, wipers, indicators and communications between vehicle modules. Ideal for professional workshops and experienced DIY mechanics who service Citroën Xsara Picasso and Peugeot 206 vehicles or who search by OE number.
Technical Information
- Manufacturer: Siemens
- Model: Citroën Xsara Picasso; Peugeot 206
- Product Codes: 9653667580; S118085320; E01-00
- Additional Numbers: 1650882680; 6580FQ; NFP
Common Symptoms And Function
The BSI (Built-in Systems Interface) acts as the central comfort and body control unit. When it malfunctions, common symptoms include intermittent or permanent failure of central locking, faulty interior or exterior lighting, erratic wiper/washer operation, dashboard warning lights, immobiliser or starting issues, and communication errors between modules. Technicians frequently search for the unit by OE number when diagnosing these faults.
Replacement Procedure
Basic steps for replacing the BSI unit on Citroën/Peugeot models:
- Park the vehicle on a level surface and remove the ignition key.
- Disconnect the negative battery terminal and wait a few minutes to ensure systems power down.
- Remove lower dash panels or steering column covers to access the BSI (location may vary by model, typically under the dashboard near the steering column).
- Carefully disconnect all electrical connectors, noting locking tabs and connector orientations.
- Unscrew the BSI mounting fasteners, remove the unit and install the replacement in reverse order.
- After mechanical fitment, follow the required commissioning/coding procedure (see next section).
Installation 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
- Check And Clean Connectors Before Reassembly; Corrosion Or Bent Pins Must Be Repaired.
- Replace Damaged Seals And Ensure The Unit Is Secured To Prevent Vibration Stress.
- Verify Battery Voltage Is Stable During Coding Procedures; Use A Battery Charger If Required.
- After Installation, Clear Fault Codes And Perform A Full Module Communication Check.
Why This Part Most Often Fails
BSI units commonly fail due to moisture ingress, corrosion of connector pins, thermal cycling and solder joint fatigue, electrical surges or poor battery/charging system health. Water leaks into the passenger footwell or faulty door seals can accelerate corrosion. Intermittent faults often originate in connector contacts or internal solder cracks rather than the entire module.
Notes For Professionals And DIY Mechanics
When sourcing a replacement by OE number, confirm the part codes listed above match the vehicle application. Proper commissioning (cloning or telecoding) is essential for full functionality; an incorrectly initialized BSI can cause immobiliser, locking and communication faults. Use of manufacturer diagnostic tools is strongly advised for coding and key adaptation.
