GMC Yukon Denalid Owner's Manual page 22

Automatic Release Fold and Tumble
Feature
The transmission must be in PARK (P) for this
feature to work.
Folding and Tumbling the Seat(s)
CAUTION:
{
Automatically folding and tumbling the
seat when someone is sitting in the seat,
could cause injury to the person sitting
there. Always make sure there is no one
sitting in the seat before pressing the
automatic seat release button.
22
To fold and tumble the seat, 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.
Overhead Console
Buttons shown, Panel
Button similar
2. From the front
seats, press one of
the automatic
seat release buttons
located on the
overhead console.