Your Responsibility
Increase the volume of the radio if the OnStar Advisor cannot be heard.
If the light next to the OnStar buttons is red, the system may not be functioning properly. Push 
and request a vehicle diagnostic check. If the light appears clear (no light appears), your OnStar subscription has expired and all services have been deactivated.
Push to confirm that the OnStar equipment is active.
See also:
Driver Information Center (DIC)
The Driver Information Center (DIC)
displays information about the
vehicle. It also displays warning
messages if a system problem is
detected. See Vehicle Messages for more information. All
...
Capacities and Specifications
Engine Specifications
...
Sunroof
The vehicle may be equipped with a power sliding
sunroof. To open or close the sunroof, the
ignition must be turned to ON, ACCESSORY, or
Retained Accessory Power (RAP) must be
active.
Press and ...