Cadillac DeVille 2005 Owner's Manual page 144

The controls for this feature are located to the left of
and below the steering wheel. They are used to adjust
the brightness and location of the image. Adjust the
IMAGE control so the image is as low as possible while
remaining visible.
Slide the dimmer control until the image is no brighter
than necessary to clearly and comfortably see the image.
3-24
When the system comes on, you will see the Night
Vision System symbol in the image. After about
one minute, you should see the view of the road ahead.
If you do not see the image after about two minutes
(on cold days it may take longer for the image to
display), there may be something wrong with the
system. See your dealer for service.
CAUTION:
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If the Night Vision System image is too bright,
or too high in your field of view, it may take
you more time to see things you need to see
when it is dark outside. Be sure to keep the
image dim and placed low in your field of view.
Remember that the Night Vision System can only help
you see objects that are warmer or colder than the
surroundings. It can not sense things like brake lights,
turn signals or emergency flashers, traffic lights, or signs.