Fuse location for horn

My guess you are trying to find the fuse because the horn does not work. I do not know where the fuse box is on the '98 LeSabre but there should be a fuse/relay box somewhere under the hood....it will be a black plastic box...unlatch the top and on the inside of the cover should be a schematic showing you what each fuse and relay is for. Your problem could also be a bad relay....look for the horn relay.

It is on the passenger side under the dash on sick panel you need to pull duck work down start by pulling the screws that hold on glove box door then you can see them .

Passenger side under hood are relays. Black box, you will see 2 sets of relays, left and right. The horn relay is the 2nd relay on the left set of relays, (1st set)