Hummer H2 2009 Owner's Manual page 23

CAUTION:
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A safety belt that is improperly routed, not properly
attached, or twisted will not provide the protection
needed in a crash. The person wearing the belt
could be seriously injured. After raising the rear
seatback, always check to be sure that the safety
belts are properly routed and attached, and are
not twisted.
To install the seat:
1. Slide the front wheels into the slots on the floor
while holding the rear of the seat up. The front
latches should lock into place. If the latches do not
lock, try tilting the rear of the seat upward.
2. Once the latches are engaged, pull up on the lever
labeled 3 to allow the seat to drop into place.
3. Pull up on the lever labeled 1 to return the seatback
to its upright position.
4. Push and pull on the seat to make sure it is locked
into place. The seatback cannot be raised to the
upright position unless the seat is secured to
the floor.
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