The fuse for the dome lights in a 2001 Chevy Venture is usually located in the
underhood fuse box. However,
there's no single definitive answer without checking your owner's manual. The manual will have a fuse diagram showing the exact location and what fuse controls the dome light circuit. The fuse may be labeled "Dome," "Courtesy," or something similar.
If you don't have the owner's manual, you can often find a downloadable version online by searching for "[Year] Chevy Venture owner's manual PDF." The diagram will make finding the correct fuse much easier than guessing.