Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not operate if the battery is discharged or disconnected.
See also:
Tips and Troubleshooting Chart
...
How the System Works
URPA comes on automatically when the shift lever is moved into R (Reverse). A
single tone sounds to indicate the system is working.
URPA operates only at speeds less than 8 km/h (5 mph).
An obstac ...
Setting Preset Stations
To store presets:
1. Tune to a radio station.
2. Press and hold one of the six numbered pushbuttons for three seconds until a beep sounds.
3. Repeat Steps 1 and 2 to store additional radio stations ...