Oldsmobile 1999 Cutlass - Manual (Page 186)

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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 once to
turn your hazard flashers
on. The switch will flash
when activated.
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 again.
When the hazard warning flashers are on, your turn
signals won’t work.
Other Warning Devices
If you carry reflective triangles, you can set one up at
the side of the road about 300 feet (100 m) behind
your vehicle.