1999 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 11

yellowblue 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. 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. You can also reshape the back wing area of the lower seatback. To increase support, press and hold the top of the rocker switch. Let go of the switch when the lower seatback reaches the desired level of support. To decrease support, press and hold the bottom of the rocker switch. Let go of the switch when the lower seatback reaches the desired level of support. To increase support, press and hold the front of the rocker switch. Let go of the switch when the lower seatback reaches the desired level of support. 1-5