GMC Terrain 2018 Owner's Manual page 13

12 In Brief
2. Push and pull on the seatback
to make sure it is locked.
See Reclining Seatbacks 0 58.
Power Driver Seat
To adjust a power driver seat,
if equipped:
Move the seat forward or
rearward by sliding the control
forward or rearward.
Raise or lower the front part of
the seat cushion by moving the
front of the control up or down.
Raise or lower the entire seat by
moving the rear of the control up
or down.
See Power Seat Adjustment 0 57.
To recline a power seatback,
if equipped:
Tilt the top of the control
rearward to recline.
Tilt the top of the control forward
to raise.
See Reclining Seatbacks 0 58.
Lumbar Adjustment
If equipped, press and hold the front
or rear of the control to increase or
decrease lumbar support.
See Lumbar Adjustment 0 58.