Vanity Lamps
WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
The inadvertent power relay also provides battery positive voltage to each vanity mirror lamp. When the vanity mirror cover on the sunshade is opened, the internal switch closes to provide a ground circuit and the vanity lamp illuminates.