Auto-On Headlights System Description
WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
The auto-on headlights system works as follows.
With the ignition switch turned ON, the lighting switch turned to the "AUTO" position and the parking brake released, when it becomes dark the headlights and clearance lights are turned ON and when it becomes bright, both of these lights are turned OFF.