Description
BSM B2 SIEMENS For Citroën And Peugeot Vehicles 964349898. This Is A Used Unit Guaranteed To Be Functional. Some Mounting Brackets May Be Damaged — This Does Not Affect Functionality.
Overview
The BSM B2 Siemens is a vehicle body system module used on various Citroën and Peugeot models. Installed in the engine bay, the BSM combines fuse/relay functions with electronic control of multiple body and comfort circuits. This used unit is an economical replacement for a faulty original BSM and is supplied with a guarantee of functionality. Common search terms: BSM B2, Siemens BSM, Citroën BSM, Peugeot BSM, 964349898, 9650618580.
What It Does
The BSM typically manages power distribution for engine-bay relays and fuses and controls several vehicle functions such as lighting circuits, wiper control, central locking relays, horn, some comfort electronics and signal routing between the wiring harness and other control units. As a central electrical module it helps protect and route current to many downstream systems.
Compatibility
Fits various PSA Group models where this specific BSM version is used. Common compatible models include:
Citroën Berlingo, Citroën C2, Citroën C3, Citroën Xsara, Citroën Xsara Picasso, Peugeot 206, Peugeot Partner.
Technical Information
- Manufacturer: Siemens
- Model: BSM B2
- Product Codes: 9650618580, 9650618580-00, U11847002 J
- Other Numbers: 964349898, 6500Y1, 6500Y3
Installation Recommendations
Recommended steps for safe replacement:
- Disconnect the negative battery terminal before any work to avoid short circuits and register loss.
- Locate the BSM in the engine bay (usually in the fuse/relay box area). Remove protective cover and note fuse/relay positions.
- Carefully disconnect all electrical connectors by releasing retaining clips — avoid pulling on wiring harnesses.
- Remove mounting bolts or fasteners and transfer the unit, then install the replacement BSM and refit fasteners.
- Reconnect connectors firmly and ensure seals are correctly seated to prevent moisture ingress. Refit covers and reconnect the battery.
- After installation, check all affected functions (lights, indicators, central locking, wipers, etc.). On some vehicles model-specific initialization or checks may be required as per factory procedure.
Why This Part Most Commonly Fails
Typical causes of BSM failure are environmental and electrical stress. The most frequent issues include water ingress and corrosion in the connector area, thermal stress from engine-bay temperatures, vibration and mechanical damage to mounting points, and electrical faults such as short circuits or overloaded circuits that can damage internal components. Poor sealing or previous improper installation accelerates deterioration. In many cases external damage to mounting brackets does not affect the module’s electrical functionality, but connectors and seals should always be inspected.
Notes For Mechanics And DIY Enthusiasts
- This is a used unit offered with a guarantee of functionality. Visual inspection of connectors and seals is recommended prior to installation.
- Keep replacement fuses and a multimeter handy for post-installation diagnostics.
- If multiple electrical faults are present, check wiring and grounds to prevent repeated failure of the new BSM.
