GMC YUKON XL 2003 Manual page 27

The head restraint can be removed and stored in the
space provided in the folded up seat cushion.
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.
2. Pull the seatback
release lever up and
pull the seatback
forward. Then fold it
until it is flat.
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.
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