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:
Glove Box
Lift the glove box handle up to open it. Use the key to
lock and unlock the glove box. ...
Service Parts Identification Label
This label, located either in the glove box or the trunk area, has the following
information:
Vehicle Identification Number (VIN).
Model designation.
Paint information.
Production options ...
Battery Load Management
The vehicle has Electric Power
Management (EPM) that estimates
the battery's temperature and state
of charge. It then adjusts the voltage
for best performance and extended
life of the batter ...