Cadillac DeVille 2005 Owner's Manual page 143

Use this system as an aid to help you in seeing objects
beyond the headlamps. Do this by occasionally
glancing at the image as you would a rearview mirror.
Do not stare at the image.
The Night Vision System can be operated if:
•
The instrument panel brightness knob is in any
position except OFF.
•
It is dark enough outside.
•
The headlamps or fog lamps (if equipped) are on.
•
The ignition is turned to ON.
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