GMC Yukon Owner's Manual page 64

Folding and Tumbling the Second Row
Seat(s) from the Third Row Seats or
Outside
WARNING:
Using the third row seating position while the
second row is folded, or folded and tumbled, could
cause injury in a sudden stop or crash. Be sure to
return the seat to the passenger seating position.
Push and pull on the seat to make sure it is
locked into place.
To fold and tumble the seat from the third row seats,
if your vehicle has them, do the following:
1. Make sure that there is nothing under, in front of,
or on the seat.
Notice: Folding a rear seat with the safety belts
still fastened may cause damage to the seat or the
safety belts. Always unbuckle the safety belts and
return them to their normal stowed position before
folding a rear seat.
2-26
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. Press the automatic
seat release button
located on the panel
behind the rear doors.