BSI S03-00 Siemens Control Unit for Peugeot 407 9655708480 S120104600

Description

Intelligent BSI S03-00 SIEMENS control unit for PEUGEOT 407

This Body Systems Interface (BSI) S03-00 from SIEMENS is a central comfort and body control module used on Peugeot 407 vehicles. It manages multiple vehicle functions including central locking, lighting, interior electronics, wiper control, power windows, alarm and some comfort features. Often searched for by part numbers (e.g. 9655708480 or S120104600), this unit is a direct-replacement type control module for workshops and experienced DIYers who are familiar with PSA vehicle electronics. The module is supplied as a ready unit that requires appropriate commissioning and coding to operate correctly in the target vehicle.

Technical Information

• Manufacturer: SIEMENS
• Model: Peugeot 407 / BSI S03-00
• Product Codes: 9655708480, S120104600, L6580FW
• Other Numbers: NFP

Fitment And Compatibility

Designed for Peugeot 407 applications that use the BSI S03-00 hardware. Customers commonly locate this unit by the product codes listed above—searching by part number increases the chance of rapid match. Verify that the vehicle has the same BSI reference before replacement to ensure compatibility of connectors and function allocation.

Removal And Installation

The BSI is typically accessed from behind the dashboard / fusebox area (passenger side or lower dash area depending on vehicle specification). Typical replacement steps for experienced technicians:

• Disconnect the negative battery terminal and wait a short period to ensure capacitors discharge.
• Remove the necessary trim panels and access covers to reach the BSI housing.
• Carefully unplug electrical connectors, noting locking tabs and connector orientation.
• Remove the retaining fasteners and extract the BSI module.
• Install the new unit, reconnect connectors, reassemble panels and restore the battery.
• Complete the required commissioning/coding steps (see Mounting And Coding section below).

Mounting And Coding – Important

• The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Options To Put Into Service:
  1. Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
  2. 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).
• Before Removal/Installation Always Disconnect The Battery And Follow The Manufacturer’S Procedure To Avoid Damage To The Unit.

Recommended Installation Tips

• Use PSA Diagnostic Tools For Coding And Key Adaptation To Ensure Full Functionality.
• Observe ESD Precautions When Handling The Module And Avoid Static Discharge.
• Replace Any Damaged Connector Clips Or Seals To Prevent Future Moisture Ingress.
• Verify All Comfort Functions (Central Locking, Lights, Wipers, Windows) After Coding And Before Final Reassembly.

Why This Part Commonly Fails

Failures Are Most Often Caused By External Factors Rather Than Normal Wear. The Typical Causes Include:

• Moisture Ingress Or Corrosion In Connectors Or Module Housing.
• Electrical Surges Or Poor Battery/Charging System Connections Causing Damage To Electronic Components.
• Cold Solder Joint Failures Or Mechanical Stress From Vibration Over Many Years.
• Software Or Data Corruption That Requires Cloning Or Reinitialization.

This description is aimed at professional technicians and experienced DIY enthusiasts who will handle removal, replacement and commissioning of BSI modules. Use appropriate diagnostic equipment and follow manufacturer procedures to restore full vehicle functionality.