Another classic example is speed sensitive door locks - if the speed of the car exceeds 15 kmph, the doors auto-lock.
Or if it gets dark, the light sensor will sense the intensity of light falling on it and will turn on the headlamps automatically. For instance, the rain sensor will sense the droplets on the windshield and will close the windows and the sunroof automatically, and will turn on the wipers if the BCM has been programmed to do so. The BCM gets its input from the several sensors and variable resistors mounted onboard the car. The BCM communicates with the car’s other control modules through the CAN bus. The BCM is an electronic control unit that monitors and controls several functions in the car such as the interior and exterior lighting, the central locking and anti-theft system, interfacing with the vehicle’s instrument cluster, HVAC system, rear-view mirrors, wipers etc. The terms CECM/BCM are used interchangeably and they essentially mean the same component.
CECM - Central Electronics Control Module
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