I/P Compartment Lamp
WARNING: This page is about a different car, the 2005 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
The INTERIOR LIGHTS fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the instrument panel (I/P) compartment lamp through the courtesy lamp supply voltage circuit. When the I/P compartment is opened, its switch closes providing a ground circuit, and the I/P compartment lamp illuminates.