GMC Yukon Owner's Manual page 66

Returning the Seatback(s) to the
Upright Position
To return the seatback to the upright position, do the
following:
1. Open the liftgate to access the controls for
the seat.
2. Pull up on the seatback until it locks into the
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.
3. Push and pull on the seatback to make sure it is
locked.
2-28
Tumbling the Third Row Seat
The seat can be tumbled forward for additional cargo
space.
To tumble the seat, do the following:
1. Open the liftgate to access the controls for
the seat.
2. Make sure the head rests are completely lowered
and there is nothing under, in front of, or on
the seat.
3. Fold the seatbacks forward using the instructions
previously listed under Folding the Seatbacks .
You will not be able to unlatch the seat from the
floor unless the seatback is folded down.
4. Unlatch the seat from
the floor by lifting the
lever located next to
the carrying handle on
the rear of the seat
near the bottom.