Hummer 2004 H2 - Manual (Page 138)

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.
But they won’t flash if you’re braking.
The hazard warning
flasher button is located at
the top of the steering
column.
Press the button 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 until the first
click and release.
When the hazard warning flashers are on, your turn
signals won’t work.
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