GMC Terrain Denali 2015 Owner's Manual page 59

3-10 Seats and Restraints
Warning (Continued)
Always push and pull on the
seatbacks to be sure they are
locked.
Warning
A safety belt that is improperly
routed, not properly attached,
or twisted will not provide the
protection needed in a crash. The
person wearing the belt could be
seriously injured. After raising the
rear seatback, always check to be
sure that the safety belts are
properly routed and attached, and
are not twisted.
To raise the seatback:
1. Lift the lever on top of the
seatback. Raise the seatback
and release the lever.
2. Push the seatback rearward until
it locks in the upright position.
3. Make sure the rear safety belts
are not twisted or caught
between the seat cushion and
the seatback.
Reclining the Seatbacks
To recline the seatback:
1. Lift and hold the lever on top of
the seatback.
2. Tilt the seatback rearward, then
release the lever when the
seatback is in the desired
position.
Seat Adjustment
To slide the entire seat forward or
rearward:
1. Lift and hold the release bar
under the front of the seat
cushion to unlock the seat.
2. Slide the seat to the desired
position.
3. Release the bar.
4. Try to move the seat back and
forth to ensure the seat is locked
into place.