Pontiac 1999 Firebird - Manual (Page 314)

yellow blue
6-66
There are three fuse centers on your vehicle. One (main
fuse block) is located behind a cover in the left side of
your instrument panel. The other two are in the engine compartment. Open the
cover on the boxes to expose the fuses.
Look at the silver - colored band inside the fuse. If the
band is broken or melted, replace the fuse. Be sure you
replace a bad fuse with a new one of the correct size.
If you ever have a problem on the road and don’t have a
spare fuse, you can borrow one. Just pick some feature
of your car that you can get along without
-- like the
radio or cigarette lighter -- and use its fuse, if it is the
size you need. Replace it as soon as you can.