Cadillac 2004 DeVille Owner's Manual page 152

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.
In dry, clear weather, the system can see pedestrians,
animals and the direction of the road ahead. In light
rain, light snow or light fog the image may not be
as clear and you may not be able to see the direction of
the road ahead. In more severe weather conditions,
the image may be unclear and not usable.
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CAUTION:
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Do not use the Night Vision System to replace
your normal view of the road ahead. It can not
tell you how far away things are. It senses only
warmer or colder objects, not all objects.
Driving by staring at the image might cause you
not to see important objects in the road ahead.
If you do not see something in time, you could
have a crash in which you and others could be
injured. Use the Night Vision System only as a
driving aid.
It is also important to keep your windshield, the HUD
(Head-Up Display for the Night Vision System) lens and
the camera lens clean. If you do not keep everything
clean, system performance may be affected.
The HUD system is located on the driver's side of the
instrument panel, next to the windshield and the camera
is located behind the center of the front grille.
Use only household glass cleaner and a soft cloth to
clean the HUD or camera lens. Wipe gently and
dry thoroughly.