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.