Not sure about a 1999, but there are 2 fuse boxes on a 1997, one under the hood and one in the trunk. Hope this helps.
How do you change the fuse on a cigarette lighter for a 2005 sts Cadillac
I have a 1999 Cadillac Seville STS and it's located under the back seat in the fuse box. It's labeled "Audio".
MY 95 sts is on the left side quarter panel behind the carpet
Fuse box in 1992 STS located in engine compartment front of driver side inside on fender area. Second fuse box is in the trunk located on drivers side on side wall
the battery is under the back seat and so are the fuse boxes there is also a fuse box under the trunk where is fuse box under trunk
Underneath the air filter box (under the hood on the driver's side).
There is one large fuse panel under the hood and two fuse boxes under the rear seat, one on each side.
Beside the parking brake.
In the trunk, remove the back panel by unscrewing the four plastic knobs on the roof of the trunk, there is the entire fuse box for the vehicle
There are two fuse boxes on the 1999 Cadillac STS; the first is underneath the hood on the passenger side. There is a red plastic positive voltage cover that is attached to the cover. The second is underneath the rear seat next to the battery. This is called the rear junction block according to GM. It looks just like the under-hood fuse box and is on the driver side. In order to get the seat off just pull up on the bottom front of the cushion.
The 1997 Cadillac trunk fuse location is dependent upon the type and model of the Cadillac. The trunk fuse will be in the fuse box. The location should be listed on the inside cover of the fuse box.
Where is the fuse box on a 1987 cadillac sadan deville.