Hummer 2004 H2 Owner's Manual page 20

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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.
4. Squeeze the release handle while pulling the
seat out.
5. While holding the rear of the seat up, roll the seat
out of the vehicle.