See also:

Universal Remote System Programming
Vehicles with the Universal Remote System will have these buttons located in the headliner. This system provides a way to replace up to three remote control transmitters used to activate device ...

Control Buttons
The buttons used to control the XM radio are: RADIO/BAND: Press to turn the radio on and choose between AM, FM, and XM, if equipped. SEEK / SEEK: Press to go to the previous or next channel. ...

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 remotel ...