THE BSM (Boîtier de Servitude Moteur) In the Citroën C4, it’s a fundamental electronic module located in the engine compartment, near the battery, that acts as a control center for various electrical components of the vehicle that require high power. It controls important systems such as:
- Front and rear windshield wipers
- Headlights, including fog lights
- Starter motor
- Fuel pump (fuel supply to the injection control unit)
- Coils and fuel injectors
- Horn
- Air conditioning compressor (activating the magnetic clutch)
The BSM is responsible for managing these devices through relays and fuses, ensuring they receive power correctly. It acts as an intermediary between the injection control unit and these power-demanding components, releasing or cutting off the power supply as needed.
Problems in the BSM module can cause malfunctions in various electrical systems, difficulty starting the engine, warning lights illuminating on the dashboard, and even problems with the brake and airbag systems.
In short:
| Function of the BSM Citroën C4 | Examples of Controlled Components |
|---|---|
| Controlling high-power devices | Windshield wipers, headlights, fuel pump, horn, starter motor, air conditioning compressor. |
The BSM differs from the BSI (body control module, which is located inside the vehicle) because the BSM is located in the engine and specifically manages components that require higher power.
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