Description
Intelligent BSI S03-00 Siemens unit for Peugeot 407
Product Overview
This used BSI (Built-in Systems Interface) S03-00 unit from Siemens is a direct-fit comfort and body control module for Peugeot 407 vehicles. Designed for professional garages and experienced DIY mechanics, this unit manages a wide range of vehicle comfort and safety functions — from central locking and interior lighting to wiper control, power windows, and communication with the immobilizer. The item is commonly searched by its product codes, so check the numbers below when looking for a replacement.
Why Choose This Unit
Replacing a faulty BSI with a compatible S03-00 unit restores lost comfort features and removes persistent electrical faults caused by a damaged body control module. This unit is ideal for workshops and home mechanics who need a reliable replacement part that can be made operational either by cloning or by professional initialization and coding. Including product codes in the listing improves searchability for mechanics who look up parts by reference numbers.
Technical Information
- Manufacturer: Siemens
- Model: BSI S03-00 (for Peugeot 407)
- Product Codes: 9655708480, S120104600
- Additional Numbers: L 6580FW, NFP
- Category: BSI – Comfort Unit | Electrical Components | Control Units
Compatibility
Suitable For: Peugeot 407 models that use the BSI S03-00 platform. Verify the unit reference numbers above against the original unit to ensure correct fitment.
Installation And Coding – Important
- The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
- Options to make it operational:
- 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 technician with PSA diagnostic equipment (DiagBox/Lexia/PP2000).
- Always disconnect the battery before removal/installation and follow the manufacturer’s procedure to avoid damage to the unit.
Installation Recommendations
Before replacing the BSI, disconnect the negative battery terminal and wait a few minutes. Document connector positions and take photos of the wiring harness to aid reassembly. Access the BSI following vehicle trim removal instructions (retain fasteners and clips). When unplugging electrical connectors, release locking tabs and avoid pulling on wires. Secure the replacement unit in the original mounting position to prevent vibration damage. After physical installation, perform cloning or coding as required and run a full check of body functions (central locking, interior lights, wipers, windows, alarm, instrument communication). Clear fault codes and confirm correct operation of immobilizer and remote keys if applicable.
Why This Part Fails Most Often
- Water Ingress And Corrosion: Moisture or liquid contact causes connector corrosion and internal PCB damage.
- Electrical Surges: Voltage spikes from jump starting, faulty alternators, or short circuits can corrupt memory or damage components.
- Connector And Wiring Issues: Loose, oxidized, or damaged connectors produce intermittent faults and communication errors.
- Environmental Aging: Heat cycles and humidity over years can lead to component failure inside the unit.
For professional results, cloning the original unit’s EEPROM/Flash is the fastest way to restore full functionality. If cloning is not possible, virginization and coding via authorized PSA diagnostic tools will be required. Ordering the correct product code listed above increases the likelihood of a trouble-free replacement.
Ready to replace your Peugeot 407 BSI? Use the product codes in the technical information to confirm you have the correct unit and proceed with professional coding for a reliable restoration of comfort functions.
