Cadillac 2002 DeVille Owner's Manual page 139

Communication Button: Press this button at the
end of a call. Also press this button to answer a call
from the center, or cancel a call if one of the other
buttons is accidentally pressed. This button is also is
also used to access OnStar Personal Calling and Virtual
Advisor services. See the OnStar owner package for
more information.
Volume Control: You can control the volume of the
OnStar System using the steering wheel controls.
Telltale Light: This light will indicate the status of
the system. A solid green light will come on when you
start the vehicle to let you know that the system is on
and is ready to make or receive calls.
If the light blinks green it means that an incoming or
outgoing call is in progress. Press the Communication
button if you notice the light blinking and you are not
on a call.
The light will be red in the event of an OnStar system
malfunction. If this occurs press the OnStar Services
button to attempt to contact an advisor. If the connection
is made, the advisor will assist you with steps to take to
make sure that the system is functioning properly. If you
cannot contact the advisor, take your vehicle to your
dealership as soon as possible for assistance.
Cellular Antenna
The cellular antenna on the outside of your vehicle is
critical to effective communication using the OnStar
system. Optimum cellular reception can be obtained
when the mast is straight up and down.
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