Buick 2004 Century - Manual (Page 106)

Hazard Warning Flashers
The hazard warning flashers let you warn others to use
caution when approaching your vehicle. They also
let police know you have a problem.
The hazard warning
flasher button is located on
the top of the steering
column.
Press the button to activate the front and rear turn
signals to flash on and off.
The hazard warning flashers work no matter what
position the key is in, and even if it is not in the ignition.
When the hazard warning flashers are on, the
individual turn signals will not operate.
Other Warning Devices
If you store reflective, safety triangles in the vehicle, put
one at the side of the road, about 300 feet (100 m)
behind the vehicle to warn oncoming traffic of an
emergency situation.
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