GMC 1997 Safari Owner's Manual page 16

To adjust your seatback, pull up on the lever on the
lower outside of the seat.
The center bench seatbacks will recline further back
than the rear bench seatbacks.
To raise or lower the center
console, press the button
between the beverage
holders. Only sit in the
center seating position
when the console is in an
upright position.
For details about headrests, see "Head Restraints" in
this section.
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