There are many switches throughout your GMC S15's operating system, and they must all work appropriately to ensure the efficiency and performance of your vehicle. Whether your windshield wipers aren't coordinated, or the headlights aren't switching from high beams to low beams properly, switches may be the source of your trouble.
Switches control many processes in your GMC S15, including the air conditioning, tail lights, ignition, power door locks, and signal lights. There are many types of switches available, from illuminated to non-illuminated styles and many more. Identify the type you need with an online search using the year, make, and model of your auto.