1996 GMC Yukon Owner's Manual - Page 11

You can use the round center knob to move the seat where you want it. To raise the seat, move the knob up. To lower the seat, move the knob down. To move the seat forward, move the knob toward the front of the vehicle. To move the seat rearward, move the knob toward the rear of the vehicle. 'ower Lumba .djustment If you have power lumbar adjustment, you can increase or decreaselumbar support in an area of the lower seatback. You can also raise and lower the front and rear of the seat. To raise the front of the seat, move the front lever up. To lower the front of the seat, move the front lever down. To raise the rear of the seat, move the rear lever up. To lower the rear of the seat, move the rear lever down. To increase support, press and hold the front of the rocker switch. Letgo of the switch when the lower seatback reaches the desired level of support. To decrease support,press and hold the rear of the rocker switch. Let go of the switch when the lower seatback reaches the desired level of support. 1-3