Horn
Pressa 
on the steering wheel pad
to sound the horn.
See also:
StabiliTrak® System
The vehicle has the StabiliTrak system which combines antilock brake, traction, and stability control systems and helps the driver maintain directional control of the vehicle in most driving condition ...
Adding or Removing Categories
1. From the Home Page press the Config screen button or the CONFIG button on
the faceplate.
2. Select Radio Settings from the Config Menu list.
3. Select Add/Remove XM Categories.
4. From the Add ...
Retrieve My Number
1. Push X. System responds: “OnStar ready.”
2. Say “My Number.” System responds: “Your OnStar Hands-Free Calling number is.” ...