GMC 1999 Suburban Owner's Manual page 18

To release the easy entry second seat, lift up on the
top of the release lever with your foot. Push the top
of the seatback forward and tilt it toward the front of
the vehicle.
To return the seat to its regular position, return the
seatback to its upright position, then push the whole seat
rearward until it latches.
After returning the seat to its regular position, try to
move the seat with your body, to make sure the seat is
locked into place.
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There is a foot operated
release lever for rear seat
passengers to use when
getting out of the third seat.
Removing the Rear (Suburban Third Seat)
If your vehicle has a third seat, it can be taken out for
more cargo space.
Before removing the seat, unlatch the outside passenger
position safety belts from the seat frame.
To unlatch the safety belt,
press the tip of a key into
the release hole of the
safety belt attachment
while pulling up on the
safety belt.
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