GMC 2001 Sierra - Manual (Page 417)

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Underhood Electrical Center
The underhood electrical center is located on the
driver’s side of the engine compartment near the battery.
Lift the cover for access to the fuse/relay block.
Once you remove the cover, you will see some fuses to
the top right of the fuse/relay block. These are spare
fuses and can be used accordingly.
You can remove fuses with a fuse extractor. The fuse
extractor is located in the underhood electrical center. To
remove fuses if you don’t have a fuse extractor, hold the
end of the fuse between your thumb and index finger
and pull straight out.
See “Engine Compartment Overview” in the Index for
more information on its location.