2012 GMC Sierra Owner's Manual - Page 30

1-24 In Brief Dual Automatic Climate Control System Transmission Range Selection Mode The Range Selection Mode switch, if equipped, is located on the shift lever. A. Driver and Passenger Temperature Controls B. Fan Control C. AUTO D. Defrost E. Air Recirculation F. Outside Air G. Air Delivery Mode Control H. Display I. J. L. Power Button Rear Window Defogger PASS (Passenger) To enable the Range Selection feature: 1. Move the column shift lever to the M (Manual) position. The current range will appear next to the M. This is the highest attainable range with all lower gears accessible. As an example, when 5 (Fifth) gear is selected, 1 (First) through 5 (Fifth) gears are available. K. Air Conditioning See Dual Automatic Climate Control System on page 8‑5.