GMC 2007 Yukon XL Owner's Manual page 30

Folding and Tumbling the Seat(s) from the
Third Row Seats
CAUTION:
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Be sure to return the seat to the passenger
seating position when finished. Push and
pull on the seat to make sure it is locked in
place. Never use the third row seating
position while the second row is folded or
folded and tumbled. This could cause
injury in a sudden stop or crash.
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.
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3. Lift the lever again to release the rear of the
seat from the floor. The seat will tumble
forward.
2. Lift the lever,
located on the
bottom rear of the
second row seat on
the inboard side,
to release the
seatback. The
seatback will fold
forward.