See also:

How the System Works
URPA comes on automatically when the shift lever is moved into R (Reverse). The rear display briefly illuminates to indicate the system is working. URPA operates only at speeds less than 8 km/h ...

Security
OnStar provides services like Stolen Vehicle Assistance, Remote Ignition Block, and Roadside Assistance, if the vehicle is equipped with these services. OnStar can unlock the vehicle doors r ...

XM Radio Messages
If you have a Radio with CD or Radio with Six-Disc CD, you can receive these radio display messages. If you have a Radio with CD (MP3), you can receive these radio display messages. ...