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BCM (Body Control Module) controls all facilities that a vehicle has inside and outside, i.e. headlights, signals, and rear lights. BMW calls it FRM/Footwell Module or Light Module; French cars call it BSI etc. 
The rapidly increasing demand for driving comfort and safety inevitably leads to the need for cutting-edge vehicle electrical system architecture. What is a BCM (body control module)? It is a comprehensive system that communicates and integrates the work of all electronic modules through the vehicle CAN-Bus. Strictly speaking, the body control module controls load drivers and coordinates the activation of auto electronics units.
The microprocessor and connectors integrated into a BCM constitute the central structural unit of the system responsible for the controlling part. Operating data is transmitted to the control module through input devices. These may include sensors, vehicle performance indicators, and variable reactors.
After the module processes data, a response signal is generated through integrated output devices, including relays and solenoids (Actuators). Through the system of output devices, the BCM coordinates the work of various electronic systems. This BCM design diagram shows a customized circuit that connects and integrates smaller electronic circuits as a gateway.