Chevrolet 2000 Tahoe Owner's Manual page 25

The seat locks into place and does not need to be removed
when carrying cargo. See "Removing the Third Row Seats "
for Utility later in this section for removal instructions.
Suburban/Yukon XL: The seatback of the third seat
(if equipped) in Suburban/Yukon XL models also folds
down to create more cargo space.
To fold the seatback down, pull up on the release lever,
labeled 1, located on the rear of the seatback, then push
the seatback forward.
1-12
If more cargo space is
desired, the third seat can
also be folded and tumbled
forward or removed if
necessary by pulling up on
the release lever labeled 2.
To return the seat to the passenger position, pull up on
the release lever and then pull up on the seatback until
it locks into the upright position. Push forward on the
seatback to make sure it is locked into position.
If still more cargo space is desired, the third seat can
also be folded and tumbled forward by using the lever,
labeled 2. To return the seats to their original position,
reverse the above steps.
Fold and Tilt Feature (Suburban/Yukon XL
Third Seat)
Once the third seatback has been folded down, the
entire seat can be tilted forward to create a flat load
floor. To do this, you will need to enter the rear cargo
area of the vehicle. Make sure the head restraints have
been lowered completely.
With the seat folded, unlatch the seat from the floor by
pulling up on the lever located under the carrying handle
at the rear of the seat labeled 2. Lift the rear of the seat
up, off of the floor. You will not be able to unlatch the
seat from the floor unless the seatback is folded down.
Tilt the seat fully forward and secure it in place using
the support rod located on the underside of the seat,
passenger side. Make sure the support rod pin is fully
engaged in the lock.