The headlight switch is located under the left side of the dashboard. You can access headlights, door panel lights, dash dimmer lights and dome lights through this switch. A faulty switch can be annoying, especially when driving at night. If you're having some lighting issues, this switch might be the way to go. what is it? The headlight switch, commonly known as the dimmer switch, is an electronic switch responsible for controlling the functions of the headlights of the vehicle. It is usually mounted on the steering column, but they can also be installed inside the vehicle as buttons or knobs. This is a switch, headlight and dash light dimmer and dome light (without LED indicators, service replacement vehicles with LED indicators). Malfunctioning or worn headlight switches can cause problems with headlight operation. A complete failure of the headlight switch could result in all vehicle lights not functioning properly. You may find that when you turn on the headlights, none of the modes turn on any lights. It is not safe to drive a vehicle without any functional lights, especially in low light and at night