Hummer H2 2010 Owner's Manual page 54

Returning the Seat from a Tilted to an
Upright Position
WARNING:
If either seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
push and pull on the seatbacks to be sure they
are locked.
2-16
To return the seatback to an upright position:
1. Pull the lever labeled 3 toward you.
2. While still holding lever 3 toward you, grasp the top
of the seat and pull it toward you slightly.
3. Release lever 3 and pull the seat completely down.
4. Push down on the seat firmly. Try pulling it up to be
sure it is locked into place.