OnStar
®
System
When using the OnStar
®
system, the audio system will be
muted and the navigation voice prompts will be disabled
during the call. The volume of the OnStar
®
call can be
adjusted by using the steering wheel volume controls.
See “Audio Steering Wheel Controls” and “OnStar
®
System” in the index of your vehicle’s owner manual for
more information.
Global Positioning System (GPS)
The Navigation System determines the position of your
vehicle by using satellite signals, various vehicle
signals, and map data.
At times, other interferences such as the satellite
condition, road configuration, the condition of the vehicle
and/or other circumstances can interfere with the
Navigation’s ability to determine the accurate position
of the vehicle.
The GPS shows the current position of your vehicle using
signals sent by the GPS Satellites of the United States
Department of Defense. When your vehicle is not
receiving signals from the satellites, a symbol will appear
on the map screen. Refer to
Symbols on page 2-13
.
This system may not be available or interference may
occur if the following happens:
•
Signal obstructions caused by tall buildings, large
trucks, tunnels,
•
objects located on top of the instrument panel,
•
satellites will not send signals if they are being
repaired or improved,
•
after-market glass tinting has been applied to the
vehicle’s windows.
Notice:
Do not apply after-market glass tinting to
the vehicle’s windows. Glass tinting will interfere
with the system’s ability to receive GPS signals and
cause the system to malfunction. You might have
to replace the window to correct the problem.
This would not be covered by your warranty.
For more information if you are experiencing a problem,
see
If the System Needs Service on page 2-42
and
Problems with Route Guidance on page 2-41
.
2-39
