Product Overview

This Siemens BSI (Body Systems Interface) F03-00 BG control unit is designed for Citroën C2, C3 and C3 Pluriel models. It manages multiple comfort and body functions including central locking, interior and exterior lighting, wipers, alarm/immobilizer interface and communication with other control modules via the vehicle CAN network. Frequently searched by part numbers such as 9650585880 or 1650881980, this unit is a direct-fit solution for garages and DIY mechanics working on compatible Stellantis vehicles.

Why Choose This Unit

Reliable replacement for faulting comfort electronics that cause failures in central locking, instrument cluster messages, or intermittent electrical faults. Ideal for workshops and experienced DIYers who can perform careful removal and coding. Including the correct BSI often resolves multiple symptoms at once because the unit centralises many body functions.

How It Is Replaced

Replacement should be performed by a trained technician or an experienced DIYer familiar with vehicle electrics. Typical replacement steps:

• Disconnect the negative battery terminal and wait several minutes to allow capacitors to discharge.
• Remove lower dashboard trim/steering column covers to access the BSI unit (location varies by model).
• Unplug all multi-pin connectors and remove the mounting screws or clips holding the unit.
• Install the new unit, secure mounting, and reconnect connectors ensuring they sit fully home and locking tabs engage.
• Perform coding/initialization with PSA service tooling (DiagBox/Lexia/PP2000) as required — see installation and coding notes below.
• Reconnect the battery and verify operation of central locking, lights, wipers, immobilizer and instrument cluster.

Installation And Coding – Important

• The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Options To Commission The Unit:
  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 Professional With PSA Service Equipment (DiagBox/Lexia/PP2000).
• Always Disconnect The Battery Before Removal/Installation And Follow Manufacturer Procedures To Avoid Damaging The Unit.

Technical Information

• Manufacturer: Siemens
• Model: BSI F03-00 BG
• Product Codes: 9650585880, 1650881980
• Other Numbers: S118085100, F03-00, BG, I NFP

Recommended For Installation

Use original PSA diagnostic and programming tools for coding and key adaptation. Ensure connectors and wiring harness are corrosion-free and dry. If cloning is chosen, perform a full EEPROM/Flash clone before fitting to avoid immobilizer or CAN network issues. Observe anti-static precautions and avoid probing pins while the unit is powered.

Common Failure Reasons

BSI units most commonly fail due to moisture ingress and connector corrosion, thermal stress from repeated heating/cooling cycles, electrical surges (jump-starts or battery issues), or component aging such as failed capacitors. Failures typically present as intermittent electronics, loss of central locking, false alarms, or communication errors on the dash.

Expected Lifespan And Diagnostics Tips

When properly installed and protected from water and voltage spikes, BSI units can last many years, but failures often appear after 8–15 years or following significant electrical events. Diagnose with a quality scanner capable of reading body module faults and CAN messages. Check power/ground integrity and inspect connector pins before replacing the unit.

Compatibility And Search Keywords

Common search terms: Siemens BSI, BSI F03-00 BG, 9650585880, 1650881980, S118085100, Citroën C2 BSI, Citroën C3 BSI, Citroën C3 Pluriel BSI.

Original used comfort control unit Siemens BSI F03-00 BG for Citroën C2, C3 and C3 Pluriel. It is a Body Systems Interface (BSI) unit that controls the comfort and body functions of the car and is key to the communication of the multiplex network in the car. Suitable as a replacement for a defective BSI – especially for cars of the 1st generation C2/C3, where the new part is already NFP (not supplied).

Key identification and OEM numbers
– Manufacturer/type: Siemens/VDO – BSI F03-00 BG
– PSA/OEM: 9649811580, 1650881980 (1650881980 = NFP)
– Siemens number: S118085100 H
– Written on the unit label: always compare the whole designation, especially F03-00 BG and S118085100H

Compatibility
– Citroën C2 (approx. 2003–2009)
– Citroën C3 I (approx. 2002–2009)
– Citroën C3 Pluriel (approx. 2003–2010)
Note: Compatibility may vary by trim level and year of manufacture. Before ordering, please compare the BSI label and part numbers with your original piece or check against the VIN.

What the BSI controls and the typical symptoms of the defect
– Functions: central locking, direction indicators and lighting, wipers and washers, on-board network, communication with the instrument panel, immobilizer, comfort functions.
– Manifestations of defective BSI: spontaneous switching of wipers/lights, central failure, problems with diagnostics communication, random errors of comfort elements, battery discharge, engine not starting (IMMO).

Technical information
– Network: multiplex VAN/CAN depending on the vehicle equipment
– Location: interior – fuse box under dashboard (driver’s side)
– Design: integrated relays and fuses, multiple connectors
– Index: F03-00 BG (important for HW/SW compliance)

Assembly and coding – important
– BSI is paired with the car (VIN, immobilizer, equipment configuration). After replacement, adaptation is necessary.
– Options:
– Clone data from the original drive (EEPROM/flash transfer) – recommended if the old BSI is readable.
– Coding “to virgin” and subsequent pairing with PSA diagnostics (Lexia/PP2000/DiagBox).
– Without proper adjustment, the car usually won’t start. We recommend assembly and programming by an experienced car electrician/PSA diagnostician.

Why choose this part?
– Genuine PSA/Siemens part – correct compatibility and quality
– Replacement for numbers 9649811580 and 1650881980 (the new part is already NFP)
– Ideal solution for fixing frequent BSI glitches on C2/C3/C3 Pluriel

Search and Verification Tip
– Search and compare by: “BSI F03-00 BG”, “S118085100H”, “9649811580”, “1650881980”, “Citroën C3 BSI”, “Citroën C2 BSI”.
– Always check that the label and connectors match your original part before ordering.

This is an original used car part. The condition and design corresponds to the photos and markings on the label. For problem-free installation, we recommend professional coding and check compatibility in advance according to VIN and part numbers.