GMC Yukon XL 2013 Owner's Manual page 70

3-12 Seats and Restraints
Manual Fold and Tumble
Feature
Folding and Tumbling the Seat
To fold and tumble the seat:
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. Lift the lever, on the outboard
side of the seat, to release the
seatback.
The seatback will fold forward to
create a flat load floor.
If the seatback cannot fold flat,
try moving the front seat forward
and/or put the front seatback in
the upright position.