Headlamp Switch: Description
WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
The headlamp switch controls the parking lamps, the headlamps, fog lamps, the interior lamps and the instrument cluster illumination. The headlamp switch also contains a rheostat for controlling the illumination level of the instrument cluster lamps.