BSM B3 Siemens Citroën Peugeot 9643498880

Description

BSM B3 SIEMENS CITROEN PEUGEOT 9643498880
This is a used part with a guarantee of functionality
Damage to one of the holders is possible – it does not affect functionality

Part description

BSM (engine unit / fuse and relay module in engine compartment) type BSM B3 Siemens for Citroën and Peugeot cars. Searched often by the number 9643498880. The part is intended as a replacement for a non-functional unit that can cause various electrical faults in the power supply and circuit switching.

This is a used part with a guarantee of functionality. For this piece, it is stated that there may be damage to some holder, which does not affect functionality (typically mechanical damage to the plastic during disassembly/handling).

Technical information

• Manufacturer: Siemens
• Model: not specified
• Other numbers: 9643498880-00, T118470003, G, J, 6500Y3

Product codes

• Product codes: 9643498880, 9643498880-00, T118470003, 6500Y3

Marks/models mentioned: Citroën Berlingo, Citroën C2, Citroën C3, Citroën C3 Pluriel, Citroën C5, Peugeot Partner.

Installation recommendations

Generally/typically for BSM units, the exact procedure may vary depending on the specific model and make of the car. Below is a practical general procedure for BSM replacement.

1) Before assembly (checks of the used part, what to compare with the old part)

• Check the match of the product codes (minimum 9643498880, possibly 6500Y3 and additional numbers on the label).
• Compare the design of the connectors (number, shape, mechanical keying) with the old piece.
• Visually check the condition of the pins in the connectors (bent/pressed pins, oxidation, dirt).
• Take note of the damage to the holders – check that the unit can be securely held and that the connectors are properly secured.

2) Necessary tools and materials (in general, without specific extra parts)

• Basic set of ratchets/bits and screwdrivers
• Plastic pry bar for releasing covers/connectors (according to design)
• Cleaning agent for electrical contacts (as needed)
• Protective gloves, possibly a flashlight

3) Step-by-step assembly procedure

1. Turn off the ignition, remove the key and let the car “sleep” for a short time (typically a few minutes).
2. Disconnect the battery (minus pole) and ensure that the terminal cannot accidentally touch the pole.
3. Get access to the BSM unit (folding/unlocking the covers depending on the vehicle version).
4. Before disconnecting, label the connectors or take a photo for correct connection.
5. Step by step unlock and disconnect the connectors (don’t grab the cables, but the connector body/fuse).
6. Unclamp the unit and remove it from the holder.
7. Compare the old and new unit “side by side” (connectors, latches, orientation, number plate).
8. Insert the unit into the holder and seat it properly (without straining it to sit straight).
9. Plug the connectors back in the correct order and check the seat and fuses.
10. Reinstall all covers and secure the cable routing so that it does not chafe or strain.
11. Connect the battery (minus pole) and perform a basic initialization of the car according to common practice (if needed).
12. Turn on the ignition and verify that there are no power outages and that the car responds normally.

• 4) Post-assembly checks and test drive/function verification

  • Check that all connectors are tight and there is no “loose” wire anywhere.
  • Verify basic electrical functions that were initially problematic (typically power/switched circuits).
  • After a short test drive, visually check the fitment again and make sure nothing gets hot or smells like electricity.

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

  • Disconnecting/connecting without disconnected battery → risk of damage to electronics; always disconnect the minus pole first.
  • Not clicked connectors → random outages; always check the fuses and correct seating after connection.
  • Swapping connectors → avoid markings/photos before disassembly.
  • Pull the cables when disconnecting → release the connectors by their body and fuses.
  • Ignoring oxidation/dirt in the connectors → if necessary, clean the contacts and let them air out.

  Reasons why the part is damaged

  • Moisture and oxidation in the connectors or in the unit space (deteriorated contact, transition resistances).
  • Temperature stress and aging of materials (plastic, solder joints, relays).
  • Overloading electrical circuits (e.g. short circuit in wiring or appliance) leading to damage to internal parts.
  • Incompetent handling during disassembly/assembly (broken holders, damaged connector locks).
  • Voltage fluctuations when disconnecting/connecting the battery incorrectly or during charging failure.