Reclining Seatbacks - GMC 2004 Yukon XL Owner's Manual

Reclining Seatbacks

To adjust the front seatback, lift the manual lever located
on the outboard side of the seat. Release the lever to lock
the seatback where you want it. Lift the lever again
without pushing on the seatback and the seatback will go
to an upright position.
If your vehicle has power seats with a power recliner,
see Power Seats on page 1-4 for further information on
how to operate the reclining seatback feature.
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But don't have a seatback reclined if your vehicle is
moving.