Description
SIEMENS BSI E03-00 Control Unit for CITROËN and PEUGEOT vehicles. Fits Citroën Xsara, Xsara Picasso, Berlingo; Peugeot 307, Partner, 206.
Overview
This Siemens BSI E03-00 is a body control/comfort unit designed for a range of Stellantis Citroën and Peugeot models. The BSI (Built-in Systems Interface) centralizes and manages multiple vehicle functions such as central locking, interior and exterior lighting, wiper control, immobilizer communication and comfort features. The unit is commonly referenced by OEM part numbers and module codes, so technicians and DIY enthusiasts often find it by searching these identifiers.
Technical Information
- Manufacturer: Siemens
- Model: BSI E03-00
- Product Codes: 9657999880, S118085120F, E03-00
- Additional Numbers: 1650882680, 1650882480, 6580FQ, 6580EZ, 6580EY, 6580EJ
- Compatible Vehicles: Citroën Xsara; Citroën Xsara Picasso; Citroën Berlingo; Peugeot 307; Peugeot Partner; Peugeot 206
Installation Recommendations
Before starting, always work in a dry, well-lit environment. Typical replacement steps:
- Disconnect the vehicle battery and wait a few minutes to ensure the system is de-energized.
- Locate the BSI module (usually mounted behind the lower dashboard area, near the steering column or under the glovebox depending on model).
- Remove trim panels and fasteners to gain access. Handle plastic clips carefully to avoid breakage.
- Unplug electrical connectors by releasing locking tabs; inspect pins for corrosion or damage.
- Replace the unit, reconnect connectors, reassemble trim and reconnect the battery.
- Perform required coding or programming procedures (see Installation And Coding – Important below) before verifying full system operation.
Installation And Coding – Important
- The unit is used and is “paired” with the original vehicle (VIN/PIN/Keys).
- Options to bring the unit into service:
- 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 specialist with PSA service equipment (DiagBox/Lexia/PP2000).
- Always disconnect the battery before removal/installation and follow the manufacturer’s procedure to avoid damaging the unit.
Why This Part Fails
BSI units are robust but may fail for several common reasons:
- Water Ingress And Corrosion: Moisture reaching connectors or the unit housing can corrode contacts and cause intermittent faults.
- Electrical Disturbances: Voltage spikes, poor jump-starting practices or faulty alternators can damage internal electronics.
- Connector Damage Or Poor Contacts: Bent pins, loose connectors or rodent damage can interrupt communication between modules.
- Age-Related Component Wear: Capacitors, solder joints or other electronic components may degrade over many years and high mileage.
- Previous Improper Repairs Or Modifications: Non-factory installations, aftermarket alarms or improper wiring can overload the BSI.
Symptoms Of A Faulty BSI
Look for central locking malfunctions, intermittent lights, non-functional wipers, immobilizer errors, key recognition problems or multiple unrelated electrical faults appearing at once. These symptoms typically indicate a fault in the BSI or its connections rather than individual actuators.
Notes For Mechanics And DIY Enthusiasts
This unit is intended for professional installers and experienced DIYers comfortable with automotive electrics. Because this module is frequently identified by part numbers, listing the OEM and module codes (above) will help find the correct replacement. After installation and required programming, verify all comfort and security functions, and perform a road check to ensure normal operation.
Purchase Advice
Searchable product codes included in the technical information make finding this BSI easy. If you are a workshop technician or a competent DIY mechanic looking to restore central electronics and comfort functions on compatible Citroën or Peugeot models, this Siemens BSI E03-00 is a direct-fit option when matched to the listed part numbers and model range.
