Cadillac 2007 XLR Owner's Manual page 313

You can end voice recognition by not speaking
any commands. After about five seconds of
silence, the system will automatically cancel voice
recognition.
At times, the system may not understand a
spoken command. If this happens, try saying the
command again. If a spoken command is not
available, the system will provide feedback based
on availability.
While using voice recognition, make sure to keep
interior noise levels to a minimum. Otherwise,
the system might not recognize voice commands.
The system will only recognize commands
spoken in English.
Voice Recognition Commands
The following list shows all of the voice commands
available for the navigation system with a brief
description of each. To use the voice commands,
refer to the instructions listed previously.
Help Commands
These commands are universal and will enable
you to use the help prompts available from
the system.
Map Help: This command will enable the system
to provide the available commands for the map
screen.
Destination Help: This command will enable the
system to provide the available commands for
entering a destination.
Guidance Help: This command will enable the
system to provide the available commands for the
guidance method.
Radio Help: This command will enable the
system to provide the available commands for
the radio.
Disc Help: This command will enable the system
to provide the available commands for the CD
changer.
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