GMC Sierra Owner's Manual page 178

However, not all features within these areas
are supported by voice commands.
Generally, only complex tasks that require
multiple manual interactions to complete
are supported by voice commands.
For example, tasks that take more than one
or two touches, such as a song or artist to
play from a media device, would be
supported by voice commands. Other tasks,
like adjusting the volume or seeking up or
down, are audio features that are easily
performed by touching one or two options,
and are not supported by voice commands.
In general there are flexible ways to speak
commands for completing the tasks.
If your language supports it, try stating a
one-shot command, such as Directions to
address <number, street, city, state/
province>. Do not include the ZIP code
while stating the address during the
command. Another example of a one-shot
Destination Entry command is, Directions to
Place of Interest at <hotel>. If these
commands do not work, try saying, Take
me to Place of Interest or Find address
and the system will walk you through by
asking additional questions.
Hybrid Speech Recognition
If equipped, this feature helps distinguish
words by using Internet-based information
along with the system s voice recognition
database. This allows you to speak more
naturally when using voice recognition.
Using Voice Recognition
Voice recognition becomes available once
the system has been initialized. This begins
when the ignition is turned on. Initialization
may take a few moments.
1. Press on the steering wheel controls
to activate voice recognition.
2. The audio system mutes and the system
plays a prompt.
3. Clearly speak one of the commands
described in this section.
A voice recognition system prompt can
be interrupted while it is playing by
pressing again.
Once voice recognition is started, both the
infotainment display and instrument cluster
show the selections and visual dialog
content. These displays can be turned on or
off in the Tutorial Mode under Settings
0 187.
Infotainment System
There are three voice prompt modes
supported:
Informative verbal prompts: This type of
prompt will provide more information
regarding the supported actions.
Short prompts: This type of prompt will
provide simple instructions about what
can be stated.
Auto informative prompts: This type of
prompt plays during the first few speech
sessions, then automatically switches to
the short prompt after some experience
has been gained through using the
system.
If a command is not spoken, the voice
recognition system says a help prompt.
Prompts and Infotainment Displays
While a voice recognition session is active,
there may be corresponding options
showing on the displays. A selection can be
made by manually touching the option,
or by speaking the number for the option to
select. Manual interaction in the voice
recognition session is permitted. Interaction
during a voice session may be completed
entirely using voice commands while some
manual commands may expedite a task. If a
selection is made using a manual control,
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