Part description

This used BSI control unit is intended for Citroën C2, Citroën C3 and Citroën C3 Pluriel cars. It is an important electronic part from the category of comfort and control units, which is often searched for by the exact designation on the label. It is therefore essential to compare all the codes listed when choosing.

The unit is marked SIEMENS BSI F03-00 BG and is particularly suitable for mechanics and more experienced DIYers who are looking for an original used part for repairing car electronics. The advantage is the possibility of tracing by production number and other markings listed directly on the part.

Technical information

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

Product codes

• Product codes: 9650585880, 1650881980, S118085100 I
• Models from labels/backgrounds: Citroën C2, Citroën C3, Citroën C3 Pluriel

Installation recommendations

This part is a BSI control unit, so when replacing it, you need to proceed carefully and with emphasis on the correct disconnection and connection of the electrical installation. The exact steps may vary depending on the specific model of the car, but in general the following recommendations apply.

1) Before assembly

• Check that the designation SIEMENS BSI F03-00 BG and all important numbers on the label match.
• Compare the connectors, their number, shape and mechanical condition with the original part.
• Inspect for damage to the unit case, brackets, connector pins or latches.
• Before work, secure the vehicle against unwanted movement and prepare a safe working environment free of moisture and static electricity.

2) Necessary tools and materials

• Basic set of hand tools
• Plastic pry bar for removing covers
• Clean gloves
• Preparation for gentle cleaning of connectors, if needed
• Diagnostic equipment for subsequent adaptation of the unit

3) Step-by-step assembly procedure

1. Turn off the ignition and leave the vehicle in idle mode.
2. Disconnect the battery according to the safe procedure for working with car electronics.
3. Remove any covers or trim that prevent access to the unit.
4. Carefully disconnect all connectors from the old unit without force and without prying the wiring.
5. Unfasten the original BSI and remove the unit.
6. Compare the old and new part side by side, especially the numbers, connectors and cabinet design.
7. Place the replacement unit in place and fix it in the same way as the original piece.
8. Connect all connectors, each must fit cleanly and without resistance.
9. Reinstall the removed covers and trim.
10. Connect the battery.
11. Perform the necessary diagnostic actions according to the type of unit and the condition of the vehicle.
12. Verify the basic functions of electronics and comfort systems.
• 4) Post-assembly checks and test drive/function verification
  • Check that the unit communicates with the vehicle without dropouts.
  • Verify functions that are normally managed via BSI, such as the comfort and electrical features of the car.
  • After assembly, observe whether there are any non-standard manifestations in the electrical installation.
  • If the state of repair requires it, also perform a short function check during normal vehicle operation.

  5) The most common assembly mistakes + how to avoid them

  • Label Code Mismatch – always compare all numbers, not just part of the label.
  • Damage to the connectors – disconnect and connect the connectors gently, never pull on the wires.
  • Assembly without disconnecting the battery – in the case of control units, it can lead to damage to the electronics.
  • Observation of mechanical damage – check the housing and connector pins before assembly.
  • Underestimation of post-replacement diagnostics – with BSI, correct commissioning is essential for the functionality of the car.

  Assembly and Coding – Important

  • The unit is used and is “paired” with the original car (VIN/PIN/keys).
  • Commissioning options:
    1. Cloning data from the old drive (EEPROM/Flash) – after the clone, the drive is plug and play.
    2. Virginization and subsequent initialization/telecoding via DiagBox (possibly online) + customization of keys.
  • Recommended to be performed by an expert with PSA service equipment (DiagBox/Lexia/PP2000).
  • Always disconnect the battery before disassembly/assembly and follow the manufacturer’s procedure to avoid damaging the unit.

  Reasons why the part is damaged

  • Voltage fluctuations in the electrical installation or improper handling when connecting the battery.
  • Moisture and oxidation which can damage the contacts and the electronics of the unit itself.
  • Damage to connectors during careless disassembly or assembly.
  • Short circuit in vehicle wiring which may affect BSI function.
  • Age and long-term thermal stress, which can be manifested by malfunctions of electronic components.
  ]]>