Oldsmobile 1999 Alero - Manual (Page 196)

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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.
Press the button on the
instrument panel to make
your front and rear turn
signal lamps flash on
and off.
Your hazard warning flashers work no matter what
position your key is in, and even if the key isn’t in.
To turn off the flashers, press the button.
When the hazard warning flashers are on, your turn
signals won’t work.