GMC 2001 Denali Owner's Manual page 23

Folding the Bucket Seats
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.
To fold the seatbacks on the bucket seats, do
the following:
1-10
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.
If the seatback cannot fold flat because it interferes with
the cushion, try moving the front seat forward and/or
bringing the front seatback more upright.
2. Push the seatback
release lever
rearward and
pull the seatback
forward. Then fold
it down until it
is flat.