2012 GMC Canyon Owner's Manual - Page 48

3-4 Seats and Restraints Power Lumbar To adjust the seatback, see "Power Reclining Seatbacks" under Reclining Seatbacks on page 3‑4. Reclining Seatbacks { WARNING Sitting in a reclined position when the vehicle is in motion can be dangerous. Even when buckled up, the safety belts cannot do their job when reclined like this. The shoulder belt cannot do its job because it will not be against your body. Instead, it will be in front of you. In a crash, you could go into it, receiving neck or other injuries. The lap belt cannot do its job either. In a crash, the belt could go up over your abdomen. The belt forces would be there, not at your pelvic bones. This could cause serious internal injuries. (Continued) Lumbar Adjustment Manual Lumbar If available, the manual lumbar knob is on the outboard side of the driver seat. Turn the knob to increase or decrease lumbar support. If available, press and hold the front or rear of the control to increase or decrease lumbar support. Release the control when the seatback reaches the desired level of lumbar support.