The headlight dimmer switch is the electrical switch that is used to control the vehicle’s headlight functions. … The dimmer switch is primarily used to switch between the high and low beam headlights, however in many vehicles it also controls the vehicle’s interior lights as well.

What is dimmer switch in a car?

What Is a Dimmer Switch in a Car? A dimmer switch controls various functions, such as switching the headlights from low beams to high beams and turning on the interior lights.

What does a dimmer switch do and how does it work?

A dimmer switch changes the direction of electrical flow every time that it is used to dim or brighten the lights. … Ultimately, the dimmer switch controls the electrical cycle for dimming a light. When the switch is turned down low the cycle takes longer to complete, and the light emits a lower level of brightness.