Horn
Pressa 
on the steering wheel pad
to sound the horn.
See also:
How OnStar Service Works
Automatic Crash Response, Emergency Services, Crisis Assist, Stolen Vehicle Assistance,
Vehicle Diagnostics, Remote Door Unlock, Roadside Assistance, Turn-by-Turn Navigation,
and Hands-Free Callin ...
Using Softkeys to Play a DVD-A (Audio)
Once a DVD-A is inserted, the radio display menu shows several tab options for playback. Press the softkey located under any tab option during DVD-A playback.
(Play/Pause): Press either the play or ...
Root Directory
The root directory of the disc is treated as a folder. If the root directory has compressed audio files, the directory displays on the radio as the CD label.
If a disc contains both uncompressed CD a ...