2012 Chevrolet Suburban Owner's Manual - Page 14

1-8 . In Brief Lumbar Adjustment Manual Lumbar Power Lumbar If available, raise or lower the front or rear part of the seat cushion by moving the front or rear of the control up or down. If available, raise or lower the entire seat by moving the entire control up or down. . See Power Seat Adjustment on page 3‑4. To adjust the power lumbar support, if equipped: If equipped, increase or decrease manual lumbar support by turning the knob forward or rearward. See Lumbar Adjustment on page 3‑5. . On vehicles with two-way lumbar, press and hold the top or bottom of the control to increase or decrease lumbar support.