To be certain, you need to consult your owner's manual. The manual will have a diagram showing the location of all fuses and what each one controls. The diagram will often use a symbol that looks like a cigarette lighter or specify "power outlet."
Without the manual, searching online for a 1997 Chevrolet Lumina LS fuse box diagram might help, but remember that different trim levels might have slightly different fuse box layouts. Using the owner's manual is the most reliable method.