GMC 1999 Suburban Owner's Manual page 19

To remove the seat, fully open the rear load doors and
enter the back of the vehicle.
Then, fold the seatback forward into the seat cushion.
Then, hang the latch plate
end of the belt on the hook
at the top of the retractor
cover, out of the way.
Move the seatback release
lever, at the right rear of the
seat, toward the center of
the vehicle.
Turn the seat sideways and take it out of the vehicle.
Replacing the Rear Seat
CAUTION:
A seat that isn't locked into place properly can
move around in a collision or sudden stop. People
in the vehicle could be injured. Be sure to lock
the seat into place properly when installing it.
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To unlatch the seat from the
floor, pull up on the center
release handle at the rear of
the seat and lift the rear seat
up, off of the floor.
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