GMC 2005 Yukon Owner's Manual page 26

Folding the Seatbacks
CAUTION:
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If the seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
press rearward on the seatback to be sure it is
locked.
The seatbacks on the bucket seats may be folded
forward to give you more cargo space.
On extended models with rear bucket seats, the head
restraints need to be removed in order to fold the
rear seats. To do this follow these directions:
1. Lift the head restraints up until they stop.
2. Press in the button on the side of the head restraint
guide cap and lift up on the head restraint.
3. Do the same for the other cap.
The head restraint can be removed and stored in the
space provided in the folded up seat cushion.
1-20
To fold the seatbacks on the bucket seats, do the
following:
1. Pull up on the strap
loop located at the rear
of the seat cushion
and pull the seat
cushion up. Then
fold it forward.