Shuffle (Radio with CD)
Turn the Menu knob and set Shuffle
Songs (Random) to On or Off, then
press the 
BACK button to return
the main screen.
On: Plays tracks in the current folder in random order.
Off: Plays tracks in the current folder in sequential order.
Repeat
Turn the Menu knob and set Repeat to On or Off, then press the /BACK button to return the main screen.
On: Repeats the current track.
Off: Playback starts from the beginning of the current track after the last track finishes.
See also:
Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn the ignition to LOCK/OFF
in each shift lever position.
The ignition should turn to LOCK/OFF only when the shift lever is in P (Park).
...
Cruise Control
The cruise control lets the vehicle maintain a speed of about 40 km/h (25 mph)
or more without keeping your foot on the accelerator. Cruise control does not work
at speeds below 40 km/h (25 mph).
...
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 ...