Which of the following is an example of an interior functional control switch?

An interior functional control switch refers to a device or switch located within the vehicle that controls specific functions essential for the operation and comfort of the driver and passengers. Map lights are controlled from within the vehicle and are intended to illuminate the interior space, allowing occupants to read maps or documents while the vehicle is in motion.

Horns, while they serve a functional purpose, are typically activated by a switch on the steering wheel and are not focused on the interior ambiance. Windshield wipers are indeed useful for visibility but are part of the external vehicle systems rather than an interior function. Emergency brakes, although critical for safety, do not fit the category of switches used for comfort or operational controls located inside the cab.

Thus, map lights exemplify interior functional control switches as they enhance the driver's ability to navigate without compromising safety, clearly fitting into the interior environment of the vehicle.