This BSI (Body Systems Interface) unit E01-00 manufactured by Siemens is designed for a range of Citroën and Peugeot models. It centralizes many body electrical functions such as central locking, interior and exterior lighting, windshield wipers, turn signals, power windows, alarm and some comfort features. Sourced as a direct-fit replacement for original part numbers, this unit is intended for professional installers and experienced DIY mechanics who are familiar with vehicle electrics and PSA service procedures.

Technical Information

• Manufacturer: Siemens
• Model: Citroën Berlingo; Citroën Xsara Picasso; Peugeot 206; Peugeot Partner
• Product Codes: 9649627780; 6580HE; E01-00
• Additional Numbers: 1650882680; S118085320A

Function And Application

The BSI acts as the vehicle’s central comfort and body computer. It manages and coordinates signals between switches, sensors and actuators for convenience functions. Typical responsibilities include: central locking control, interior lighting timing, wiper and washer logic, indicator and hazard light management, power window operation, immobilizer interface and distribution of power to specific circuits via integrated fuses/relays. Correct operation of the BSI is essential for stable vehicle electrics and comfort features.

How It Is Replaced

Replacement requires careful handling and basic automotive electrical skills. Typical steps:

• Disconnect the negative battery terminal before starting.
• Remove trim panels to access the BSI module (usually located under the dash or behind glovebox depending on model).
• Unscrew the unit, carefully unplug multi-pin connectors and any locking clips.
• Fit the replacement unit, reconnect all connectors and secure mounting screws.
• Perform coding/initialization as required (see Mounting And Coding – Important below).
• Reconnect the battery and verify all body functions (locks, lights, windows, etc.).

Installation Recommendation

Always follow manufacturer procedures and use proper tools. Protect connectors from dirt and moisture during work. If coding or cloning is required, use official PSA diagnostic equipment or a qualified workshop. Before reassembly, check for water ingress or corrosion in wiring harnesses that could cause immediate re-failure.

Why This Part Most Commonly Fails

• Moisture Ingress And Corrosion: Exposure to water or high humidity can corrode pins, printed circuit traces or connectors.
• Electrical Surges And Short Circuits: Faulty wiring, aftermarket accessories or poor battery connections can create voltage spikes that damage electronic components.
• Thermal Stress And Aged Solder Joints: Repeated heating/cooling cycles may cause cracked solder joints or component fatigue.
• Physical Damage Or Impact: Improper removal/installation or accidental impact can break connectors or PCB components.

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).
• Always Disconnect The Battery Before Removal/Installation And Follow Manufacturer Procedures To Avoid Damaging The Unit.

Keywords for search visibility: BSI E01-00, Siemens BSI, BSI 9649627780, BSI 6580HE, Citroën BSI, Peugeot BSI, comfort module replacement, PSA DiagBox coding.

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.

This BSI (Body Systems Interface) E01-00 HG manufactured by Siemens is a direct-fit comfort/control unit for selected Citroën and Peugeot models. It centralizes and manages multiple vehicle functions such as central locking, interior and exterior lighting management, wipers, electric windows, dashboard communication, immobilizer interface and CAN-bus gateway tasks. The unit is commonly searched by its product codes and OEM numbers, so listing these references helps technicians and DIY enthusiasts quickly confirm compatibility.

Technical Information

• Manufacturer: Siemens
• Model: BSI E01-00 HG
• Product Codes: 9649627780, S118085320A, E01-00
• Additional Numbers: 6580E8, 1650882380, 6580E4, 6580E5, 658000000, M59
• Compatible Models (Examples): Citroën Berlingo, Citroën Xsara Picasso, Peugeot Partner

What The Unit Does

The BSI is the vehicle’s comfort and body control module. It coordinates multiple low-voltage systems and acts as a communication hub on the CAN network. Typical responsibilities include: central locking control, interior and exterior lighting logic, intermittent wiper control, electric window management, courtesy functions, diagnostic interface for faults, and interaction with the immobilizer/key system. Failure of the BSI can cause loss of several comfort functions and, in some cases, prevent vehicle start.

Common Failure Causes

• Moisture Ingress And Corrosion: Water penetration or high humidity can corrode connectors or PCB traces.
• Electrical Surges And Short Circuits: Faults elsewhere (shorted lights, aftermarket wiring errors, jump-start incidents) can damage internal components.
• Poor Connections: Oxidized pins, broken sockets or cracked solder joints cause intermittent faults.
• Age And Thermal Stress: Repeated heating/cooling cycles may fatigue electronic components over many years.

Replacement Procedure (Overview)

Suitable for professional mechanics and experienced DIY technicians. General steps:

1. Park vehicle on a level surface, engage handbrake and remove ignition key.
2. Disconnect the negative battery terminal before any work on the electrical system.
3. Gain access to the BSI location (usually behind glovebox or under dashboard—refer to vehicle specific manual).
4. Carefully release wiring harness connectors and any security clips; label connectors if needed.
5. Remove mounting fasteners and extract the unit.
6. Install replacement unit, secure fasteners, reconnect harnesses and double-check connector seating.
7. Re-connect battery and perform necessary coding/initialization (see Coding section below).

Installation Recommendation

Always follow the vehicle manufacturer’s service manual for access and removal steps. Ensure connector contacts are clean and dry before reassembly. Use dielectric grease on exposed connectors when appropriate to reduce corrosion risk. After installation, verify all comfort functions, locking, lights and starting sequence. If the unit requires programming or cloning, use the appropriate diagnostic equipment to avoid immobilizer issues.

Installation And Coding – Important

– The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).

– Options For Commissioning:

1. Cloning Data From The Old Unit (EEPROM/Flash) – After A Successful Clone The Unit Becomes Plug And Play.
2. Virginization And Subsequent Initialization/Telecoding Via DiagBox (Or Online) + Key Adaptation.

– It Is Recommended To Be Performed By A Specialist With PSA Service Equipment (DiagBox/Lexia/PP2000).

– Before Disassembly/Assembly Always Disconnect The Battery And Follow The Manufacturer Procedure To Avoid Damaging The Unit.

Why This Part Is Often Searched By Code

Body control modules are commonly referenced by OEM part numbers when sourcing replacements because the same hardware can be fitted across several model years and variants. Searching by the exact product code (for example 9649627780 or S118085320A) is the fastest way for a technician to find a compatible unit and confirm fitment for the vehicle in question.

Notes For Buyers

Designed For Automotive Technicians And Advanced DIYers Who Are Familiar With Vehicle Electronics. Ensure Proper Diagnostics Are Performed To Confirm The BSI Is The Root Cause Before Replacement, As Wiring Issues And Faulty Peripherals Can Produce Similar Symptoms.