This BSI E01-00 comfort control unit by Siemens is intended for Citroën and Peugeot models and carries common OEM references used when searching replacements: 9649627780, S118085320A, 1650882380 and related internal codes. Designed for professional workshops and experienced DIY mechanics, the module manages central locking, lighting, wipers, interior electronics and communication between vehicle networks. Listing multiple part numbers in the description helps technicians and buyers quickly identify compatibility.

Technical Information

• Manufacturer: Siemens
• Model: BSI E01-00 HG
• Product Codes: 9649627780; S118085320A; 1650882380
• Additional Numbers: 6580H2; 6580FP; 6580GT; NFP

Compatible Models (Examples)

Commonly fitted to Citroën Berlingo, Citroën Xsara Picasso, Peugeot 206 and Peugeot Partner. Always confirm the exact part code on the unit matches the vehicle requirement before installation.

Function And Typical Failure Modes

The BSI (Body System Interface) coordinates comfort and body functions: central locking, interior lighting, wipers, alarm signals, remote key recognition and gateway communication with other control units. Failures typically arise from:

• Water ingress and corrosion affecting connectors or PCB traces.
• Electrical surges, poor grounding or battery-related faults that damage electronic components.
• Damaged connector pins or harness faults causing intermittent communication errors.
• Software/data corruption or failed solder joints on older modules.

Replacement And Installation

Replacement should be performed by a trained technician or an experienced DIY mechanic familiar with vehicle electrical systems. Typical replacement steps:

• Disconnect the negative battery terminal before any work to avoid short circuits and protect the unit.
• Remove necessary trim panels under the dashboard to access the BSI (usually located behind the fuse box or on the passenger side under the dash).
• Carefully unplug all connectors, noting their positions and locking tabs.
• Unscrew and remove the BSI; fit the replacement unit, reconnect connectors and reassemble trims.
• After mechanical installation, perform cloning or coding as required (see coding section below) before returning the vehicle to service.

Installation And Coding – Important

• The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Options To Make The Unit Operational:
  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).
• Always Disconnect The Battery Before Removal/Installation And Follow Manufacturer Procedures To Avoid Damaging The Unit.

Why This Part Fails Most Often

The most frequent root causes are moisture ingress and connector corrosion, electrical transients or improper previous repairs, and software/data mismatches after replacement. In many cases a failed BSI shows symptoms such as intermittent central locking, interior lights malfunctioning, failed remote locking, or communication errors with other control modules.

Practical Tips For Purchase

• Match the visible part numbers on the unit to your vehicle reference (9649627780 / S118085320A / 1650882380) to reduce installation issues.
• If replacing a module, plan for cloning or coding time and have appropriate diagnostic tools available or book a follow-up with a specialist for programming.
• Inspect connectors and wiring for corrosion or damage before fitting a replacement to prevent immediate repeat failure.