GMC 2007 Acadia Owner's Manual page 192

To adjust the HUD image so that items are
properly displayed, do the following:
1. Adjust the driver's seat to a comfortable
position.
2. Start the engine.
3. Adjust the HUD controls.
Use the following settings to adjust the HUD.
(Off): To turn HUD off, rotate the dimming
9
knob fully counterclockwise until the HUD display
turns off.
192
The HUD control is
located to the right of
the steering wheel.
Brightness: Turn the knob on the HUD control
clockwise to brighten the display and
counterclockwise to dim it.
w x
(Up): (Down): Press the up or down
arrows to center the HUD image in your view. The
HUD image can only be adjusted up and down,
not side to side.
?
(Page): Press this button to select the display
formats. Release the page button when the
format number with the desired display is shown
on the HUD.
The three formats are as follows:
Format One: This display gives the speedometer
reading (in English or metric units), turn signal
indication, high beam indication, transmission
positions, and the outside air temperature.