Hazard Warning Flashers; Other Warning Devices - GMC 2001 Yukon XL Owner's Manual

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.
5-2
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.

Other Warning Devices

If you carry reflective triangles, you can use them to
warn others. Set one up at the side of the road about
300 feet (100 m) behind your vehicle.
Press the button at the top
of the steering column all
the way down to make your
front and rear turn signal
lamps flash on and off.