Verify Minutes and Expiration
Push 
and say “minutes” then
“verify” to check how many minutes
remain and their expiration date.
See also:
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 battery. ...
Playing an MP3/WMA from a
USB Storage Device
See MP3 for more
information.
Connecting an iPod
To connect the iPod, connect one
end of the special iPod connection
cable to the iPod’s dock connector.
Connect the other end to both the
US ...
Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will
check the engine, transmission, antilock brakes, and major vehicle systems.
It also checks the tire pressures, if the v ...