OnStar Services

See also:

Speedometer
The speedometer shows the vehicle's speed in either kilometers per hour (km/h) or miles per hour (mph). ...

Express-Down Window
This feature is on the front windows. Press the switch to the second position to activate the express-down feature. To stop the window as it is lowering, press down briefly on the switch again. ...

Radio(s)
: Press to turn the system on and off. Turn to increase or decrease the volume. RADIO/BAND or SRCE: Press to choose between FM, AM, or XM™, if equipped. TUNE/MENU: Turn to select radio stations. ...