Specifications

Keyless Access System
When the engine is started, Driver 1 or Driver 2 will
display on the screen. A message will not appear on the
screen if the driver is unknown. The number on the
back of the transmitter corresponds to driver 1 or
driver 2. The navigation system can store memory points
for drivers 1 and 2 individually. See Keyless Access
System on page 2-5 for more information.
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 OnStar
®
System on page 2-41 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 system’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 4-44.
This system may not be available or interferences may
occur if any of the following are true:
• Signals are obstructed by tall buildings, trees, large
trucks, or a tunnel.
• Objects are located on the rear shelf.
• Satellites are being repaired or improved.
• After-market glass tinting has been applied to the
vehicle’s rear windshield.
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 4-52 and
Problems with Route Guidance on page 4-52.
4-50