Interior lights are also called dome lights that glow up when anyone enters or exits the car. They are located on the ceiling of the automobile. It stays lit until the passenger fastens his or her seatbelt.
If the button for this light is worn down or missing, then the interior lights may always remain 'ON'. It may also remain in on mode if the door of the car is even slightly open. Staying on of the light drains the battery of the automobile.