where is the interior fuse box for the buick lasaber limited 2004
Your windshield wiper is on a relay, not a fuse. Switch the relays around and see if you can get the wipers to work. Most likely the wiper motor is fried.
Under back seat
Search Buick LeSabre Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Buick LeSabre Experts