GMC 1999 Suburban Owner's Manual page 15

To fold the seat, pull on the release handle at the bottom
of the seat cushion marked RELEASE.
When you release the seat cushion, the seatback is
automatically released. Pull the loop on the seatback
forward and fold the seatback onto the seat cushion.
To return the seat to the passenger position, just lift up
on the seatback and push it rearward until it latches.
After returning the seat to the passenger position, pull
forward on the seatback to make sure it is locked into
place. Also, return the safety belts and head restraints to
their original positions, so they will be available for rear
seat passengers to use.
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