Chevrolet 2009 Corvette Owner's Manual page 157

Be sure to continue scanning the displays, controls and
driving environment just as you would in a vehicle
without HUD. If you never look at the instrument panel
cluster, you may miss something important, such as
a warning light. Under important warning conditions,
the CHECK GAGES warning will illuminate in the HUD.
View your Driver Information Center (DIC) for more
information.
To adjust the HUD so it can be seen properly, do the
following:
1. Start the engine and press the HUD dimmer control
all the way up by pressing the (+) button.
The brightness of the HUD image is determined by
the light conditions in the direction the vehicle is
facing and where you have the HUD dimmer
control set. If you are facing a dark object or a
heavily shaded area, the HUD may anticipate that
you are entering a dark area and may begin to dim.
It is possible for sunlight to enter the HUD making
it difficult to see the image. The display will return to
normal when the sunlight is no longer entering
the HUD.
The HUD controls are
located to the left of the
steering wheel.
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