GMC Yukon Owner's Manual page 58

Driver's Side Rear Panel
Button shown
One press of the button automatically folds the
seatback flat and tumbles the seat forward. There
will be a slight delay between the folding of the
seatback and the tumbling of the seat.
2-20
2. Press the automatic
seat release button
located on the panel
behind the rear doors.
Returning the Seat(s) to the Sitting
Position
To return the seat to the sitting position:
1. Pull the seat down until it latches to the floor.
The seatback cannot be raised if the seat is not
latched to the floor.
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.
2. Lift the seatback and push it rearward. Push and
pull on the seatback to make sure it is locked.