Proposal to define CLIV System as the ability to derive the potential presence of a subject or object inside the car based on logic using sensing information such as pressure or capacitive sensing. CLIV System encompasses indirect sensing methods using door logic alone or door logic combined with additional sensors, indirect sensing without door logic using pressure, capacitive, temperature, motion sensors or CO₂ concentration sensor, and direct sensing using camera, millimeter wave radar, UWB radar, or WiFi sensing to detect the absolute presence of a human inside the vehicle.