Description
Overview
Original Siemens BSM B2 (Boîtier de Servitude Moteur) engine fuse and relay box for Citroën and Peugeot vehicles. This is a used unit sold with a guarantee of functionality. The part may show cosmetic wear or have damaged plastic mounting tabs that do not affect its electrical performance.
What This Part Does
The BSM distributes power and switches essential vehicle circuits: fuel pump, cooling fan, wipers, exterior and interior lighting, ignition and related relays and fuses. It centralises protection and control in the engine bay to ensure reliable operation of critical systems.
Common Symptoms And Causes Of Failure
Typical faults include intermittent starting, fuel pump cut-outs, non-functioning wipers or fan. Failures commonly result from moisture ingress, corrosion of connector pins, thermal stress or relay overheating. Replacing a faulty BSM with the correct B2 variant usually resolves these electrical faults.
Compatibility
Commonly compatible models include Citroën Berlingo, C2, C3, Xsara and Xsara Picasso, and Peugeot 206 and Partner. Always compare the part number and connector layout with your original unit before ordering to ensure plug-and-play fitment.
Installation Guidance
Safety first: disconnect the vehicle battery before any work. The BSM is located in the engine bay near the battery. Release the retaining clips, carefully unplug the wiring connectors and remove the module. Transfer fuses and relays to the replacement unit according to the original configuration. After fitting, verify fuse ratings against the vehicle wiring diagram. When the replacement matches the original BSM B2 number and connector format, no programming is normally required.
Why Choose This Unit
Factory Siemens construction ensures accurate compatibility with PSA electrical systems. Choosing an original BSM B2 provides better fit and reliability compared with generic replacements. These modules are frequently searched by their catalogue numbers, so confirming the exact part number speeds up correct selection and installation.
Technical Information
- Manufacturer: Siemens
- Model: BSM B2 (engine fuse and relay box, under-hood)
- Product Codes: 9643498980, 9643498980-00
- Additional Numbers: 6500.Y1, 6500.Y3, T11847002
Before ordering, compare the BSM designation (B2), part number 9643498980 and connector layout with your existing unit to ensure fast, trouble-free installation and full functionality of all powered circuits.
