Headlamp Switch
WARNING: This page is about a different car, the 2006 Dodge Viper. However, it is still accessible from the selected car via links, so may be relevant.
The Headlamp Switch uses four separate circuits (inputs) to the Body Control Module (BCM) plus one circuit as a sense ground return. The Headlamp Switch controls the Fog lamps, Park lamps and the Low beam relay and High beam headlamps.