GMC 2003 Sierra 1500 Pickup Owner's Manual page 466

Turn the wheel wrench clockwise to raise the jack lift
head a little.
If your vehicle has wheel
nut caps, loosen them by
turning the wheel
wrench counterclockwise.
If you have a center
cap with wheel nut caps,
the wheel nut caps
are designed to remain
with the center cap.
Remove the center cap.
If the wheel has a smooth center piece, place the chisel
end of the wheel wrench in the slot
on
the wheel and
gently pry out.
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