GMC Yukon XL Denali 2005 Owner's Manual page 28

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3. To unlatch the rear of
the seat from the floor,
pull up on the release
lever labeled 2 at
the rear of the seat and
lift the rear of the
seat up from the floor.
5. While holding the rear of the seat up, roll the seat
out of the vehicle.
4. Pull on the release
strap located in the
lower middle of the seat
to unlatch the seat from
the floor and pull the
seat out. Use one hand
to pull the release strap
and the other on the
handle to pull the
seat out.