Your best chance of success is to find a used unit with the (e.g., 9643498880). This ensures the module has the correct physical layout, pinout, and software configuration for your specific vehicle's options.
The schematic of the BSM B3 operates on a smart power-switching philosophy, dividing power routing into four primary operating modes managed by the engine control system: Standby (System-Off) Mode siemens bsm b3 schematic
The BSM is sealed, often with a silicone or gel compound, requiring careful disassembly to access the PCB. Your best chance of success is to find