Cargo Lamp
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The inadvertent power relay provides battery positive voltage to the cargo lamp. When the cargo lamp switch is closed, ground is provided and the cargo lamp illuminates.