IP Compartment Lamp
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The inadvertent power courtesy lamps supply voltage circuit of the BCM also provides battery positive voltage to instrument panel compartment lamp. When the IP compartment is opened, a switch closes to provide a ground circuit and the IP compartment lamp illuminates.