Horn
Press 
on the steering wheel pad to sound the horn.
See also:
Trans (Transmission) Temp (Temperature) (CTS-V Only)
This display shows the transmission
fluid temperature in either degrees
Celsius (°C) or degrees
Fahrenheit (°F). ...
Windows
WARNING!
Leaving children, helpless adults,
or pets in a vehicle with the
windows closed is dangerous.
They can be overcome by the
extreme heat and suffer
permanent injuries or even death
...
Passing Another Vehicle While Using Cruise Control
Use the accelerator pedal to increase the vehicle speed. When you take your foot
off the pedal, the vehicle will slow down to the previous set cruise speed. ...