2001 GMC Sierra 1500 Pickup Owner's Manual - Page 17

Move the seat forward or rearward by moving the whole button toward the front or toward the rear of the vehicle. Moving the whole button up or down raises or lowers the entire seat cushion. Vertical Control: If your vehicle has power reclining seats, you can use this button to adjust the angle of the seatback. Move the reclining front seatback rearward or forward by moving the button toward the rear or toward the front of the vehicle. See "Reclining Seatbacks" in the Index for further information. To increase support, press and hold the front of the control. Let go of the control when the lower seatback reaches the desired level of support. To decrease support, press and hold the rear of the control. Let go of the control when the lower seatback reaches the desired level of support. You can also reshape the back wing area of the lower seatback. To increase support, press and hold the top of the control. Let go of the control when the lower seatback reaches the desired level of support. To decrease support, press and hold the bottom of the control. Let go of the control when the lower seatback reaches the desired level of support. Power Lumbar Control (If Equipped) If you have power lumbar adjustment, you can increase or decrease lumbar support in an area of the lower seatback. The control is located on the on outboard of the cushion seat. 1-4