2009 GMC Acadia Owner's Manual - Page 480

Display Brightness/Contrast/Mode VUE shown Press the MENU key to enter the menu options, then press the MENU key repeatedly until Display is selected, or select the Display screen button. Select this screen button to change the brightness, contrast, and mode of the display. Display Off Select this button to turn the display off. Press the Nav, Dest, Fav, or Menu hard key or the f (tone) button to view the display. ](Brightness): Select and hold the + (plus) or − (minus) to increase or decrease the brightness of the screen. _ (Contrast): Select and hold the + (plus) or − (minus) to increase or decrease the contrast of the screen. 2-36