BSI D9 Siemens Citroën Peugeot 9640091280 658026

Description

BSI SIEMENS unit for PEUGEOT 406 cars

Part description

This BSI Siemens unit is a used genuine auto part designed for Peugeot 406 cars. The BSI (Body Systems Interface) is one of the key control units for the vehicle’s comfort and electronic functions, which is why it is important to ensure that the markings and product codes match when replacing them. Parts of this type are often searched for precisely by part number, as the correct designation plays a vital role in selecting the appropriate part.

The product is suitable for car mechanics and more experienced do-it-yourselfers who are looking for an original electronic part to repair a Citroën or Peugeot. For this unit, the production and identification codes listed on the label are decisive.

Technical information

• Manufacturer: Siemens
• Model: Peugeot 406
• Other numbers: S108551300 H, 658026 NFP

Product codes

• Product codes: 9640091280, 658026
• Models: Peugeot 406

Installation recommendations

This part is a BSI unit, so it is necessary to proceed carefully and systematically during assembly. The exact steps may vary depending on the specific car model, but below is a generally valid and practical procedure for this type of control unit.

1) Before assembly

• Check that all label data and product codes match the old part.
• Compare the type of connectors, their number and the overall appearance of the unit.
• Inspect the unit case for cracks, deformation or moisture damage.
• Check the connector pins for bent, oxidized or loose.

2) Necessary tools and materials

• Basic set of hand tools
• Plastic pry bar for removing covers
• Clean work gloves
• Cleaning agent for electrical contacts suitable for car electronics
• Diagnostic equipment corresponding to the PSA system

3) Step-by-step assembly procedure

1. Turn off the ignition and allow the vehicle to idle according to normal service practice for electronic units.
2. Disconnect the battery.
3. Remove the covers that prevent access to the original BSI unit.
4. Carefully disconnect all connectors from the old unit, without force and without prying the wiring.
5. Remove the original unit from the bracket or mount.
6. Compare the old and new part side by side, especially the numbers, connectors and layout.
7. If necessary, gently clean the connectors with a suitable electrical contact cleaner.
8. Place the replacement BSI unit in place and secure it properly.
9. Connect all connectors so that they are fully seated and secure.
10. Reinstall all covers and surrounding removed parts.
11. Connect the battery.
12. Perform the necessary diagnostic actions, initialization or other settings according to the specific condition of the vehicle and unit.
• 4) Post-assembly checks and test drive/function verification
  • Verify basic unit communication via diagnostics.
  • Check the function of selected comfort and electrical elements of the vehicle.
  • Watch for power or communication irregularities with other systems.
  • After installation, carry out a short verification of the vehicle’s function in normal operation, if the state of repair allows it.

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

  • Unit swapping based on incomplete designation – always compare all numbers on the label.
  • Connecting with battery connected – always disconnect power to controllers first.
  • Damage to connector pins – disconnect and connect connectors straight and without excessive force.
  • Underestimating post-replacement diagnostics – after assembly, it is advisable to verify communication and correct system operation.
  • Assembly without checking the condition of the connectors – oxidation or loose contacts can cause an apparent malfunction even in an otherwise good part.

  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 on-board network or battery problems
  • Moisture, seepage or long-term increased humidity around the unit
  • Oxidation of connectors and electrical contacts
  • Unprofessional handling during disassembly or assembly
  • Short circuit in vehicle wiring
  • Surge when starting or when interfering with the vehicle’s electrical system