GMC 2002 Yukon Denali Owner's Manual page 17

Bucket Seats (Second Row)
If your vehicle has bucket seats, the seatbacks can be
reclined and the seats can be folded to give you more
cargo room.
Reclining the Seatbacks (Bucket Seats)
To recline the seatback, do the following:
2. Release the lever to lock the seatback where you want
it. Pull the lever again without pushing on the seatback
and the seatback will go to an upright position.
1-10
1. Pull the lever
located at the
base of the seat
cushion forward.
Folding the Seatbacks (Bucket Seats)
CAUTION:
If the seatback isn't 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. The headrests on
these seats will have to be manually folded to fold the
seats. To do this, push the head restraints all the way
down and tilt them forward.