Description
SIEMENS BSI F03-00 BG Control Unit for Citroën C2, C3 and C3 Pluriel models
High-quality replacement BSI (Built-in Systems Interface) from Siemens designed for Citroën small models. This body control unit restores central vehicle functions such as lighting, central locking, immobilizer communication and convenience systems. Ideal for professional workshops and experienced DIYers searching by part number (e.g. 9650585880 or 1650881980). Reliable fitment and correct coding bring the vehicle back to full functionality and reduce electrical faults caused by a defective body computer.
Technical Information
- Manufacturer: Siemens
- Model(s): Citroën C2, Citroën C3, Citroën C3 Pluriel
- Product Codes: 9650585880, 1650881980, S118085100
- Additional Numbers: F03-00 BG, I NFP
Function and Overview
The BSI is the central comfort and body control module on PSA vehicles. It manages exterior and interior lighting, central locking, wiper and washer control, electric windows, interior lights, alarm/immobilizer communication and distributes signals on the vehicle network (CAN). A faulty BSI typically causes multiple intermittent electrical faults, control units not responding, central locking or immobilizer problems and warning lights on the instrument cluster.
Fitment And Compatible Models
Designed for use on Citroën C2, Citroën C3 and Citroën C3 Pluriel models equipped with the referenced Siemens BSI. The unit is often searched for by the original part numbers listed above; always verify that the part numbers match the vehicle’s existing unit before installation.
Removal And Replacement
Typical replacement steps: disconnect the battery first, remove lower dashboard trim panels to access the BSI, carefully unplug multi-pin connectors and mounting screws, then remove the module. Fit the new unit in reverse order, ensure connectors are fully seated and fuses are intact. Because the BSI interfaces with immobilizer and keys, coding or cloning is required for correct operation (see Installation and Coding – Important below).
Installation And Coding – Important
- The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
- Options for commissioning:
- 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).
- Before removal/installation always disconnect the battery and follow the manufacturer’s procedure to avoid damaging the unit.
Recommendations For Installation
Always disconnect the negative battery terminal before starting work. Protect the unit and connectors from static and moisture. Inspect and clean mating connectors and grounding points prior to fitting. If you do not perform cloning, ensure a qualified technician performs virginization and telecoding with PSA diagnostic tools. Keep the original unit until the new unit has been successfully coded and vehicle functions verified.
Most Common Causes Of Failure
BSI failures are most often caused by moisture ingress and corrosion, electrical surges from jump-starting or alternator faults, poor grounding, or connector damage. Over time solder joints and relay contacts can degrade. Addressing underlying electrical issues (faulty alternator, poor battery connections) before fitting a replacement helps prevent premature failure.
Searchable by part numbers 9650585880 and 1650881980 – suitable for workshops and experienced DIY mechanics who need a direct replacement BSI for Citroën C2, C3 and C3 Pluriel vehicles.
