Is there a fuse for reverse lights on Buick park ave?

There isn't a dedicated fuse *solely* for the reverse lights on a Buick Park Avenue (or most vehicles for that matter). The reverse lights are usually controlled by a circuit that shares a fuse with other electrical components. To find the correct fuse, you'll need to consult your owner's manual. It will have a fuse box diagram showing which fuse controls the backup lights (often labeled "Back-up Lamps," "Reverse Lights," or something similar). It might also be grouped under a more general lighting circuit.