Car fuses blow for a variety of reasons, but the most frequent causes are shorts in the electrical system and wear and tear on the fuse. The most common car accessories that have fuses blow are the ones controlling the interior and exterior lighting, the climate settings, and the radio.
To see if a fuse has blown, the first step is to consult the owner's manual. The location of the box and the assigned circuit for each fuse should appear in a diagram in the manual. Most newer cars allow removal of the fuse box lid by hand or with a flat head screwdriver. Some fuses are designed to come out by hand, while others require a pair of tweezers or a smaller pair of needle-nose pliers. Inspect each fuse visually, and replace as necessary.