Cadillac 2004 DeVille - Manual (Page 132)

Hazard Warning Flashers
Your hazard warning flashers let you warn others. They
also let police know you have a problem. Your front
and rear turn signal lamps will flash on and off.
The hazard warning button
is located on the center of
the instrument panel
between the two air vents.
Your hazard warning flashers work no matter what
position the key is in, and even if the key is not in.
Press the button to make the front and rear turn signal
lamps flash on and off. Press the button again to
turn the flashers off.
When the hazard warning flashers are on, the turn
signals will not work.
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