2000 GMC Sierra 1500 Pickup Owner's Manual - Page 15

yellowblue Cushion Tilt (If Equipped) Manual Lumbar Control (If Equipped) If your vehicle has a lumbar adjustment, you can increase or decrease lumbar support in an area of the lower seatback. If your vehicle has this feature, you can raise or lower the front of the driver's or passenger's seat with this lever located at the inside edge of the seat. To raise or lower the front of the seat, move the lever up or down in a continuous motion until the cushion reaches the desired height. To increase support, turn the knob towards the front of the vehicle. To decrease support, turn the knob towards the rear of the vehicle. 1-3