Buick 1999 LeSabre Owner's Manual page 298

yellowblue
Passenger's Side Fuse Block
Additional fuses are located in the relay center, on the
passenger's side, below the instrument panel. You must
remove the sound insulator on the right side of the
passenger footwell to replace these fuses.
Since the replacement of these fuses can be difficult,
we recommend that you see your dealer for
fuse replacement.
6-62