GMC 2015 Sierra Owner's Manual page 226

The screen returns back to the
screen where voice recognition
was initiated.
The Back Command
Say Back or press the Back button
to go to the previous screen.
If in voice recognition, and Back is
stated all the way through to the
initial screen, then Back is stated
one more time, the voice recognition
session will cancel.
Help
Say Help on any voice recognition
screen and the help prompt for the
screen is played. Additionally, a
pop-up displays a text version of the
help prompt. Depending on how
voice recognition was initiated, the
Help pop-up will either display on
the instrument cluster or the
infotainment screen. Press the
Dismiss button to make the pop-up
go away.
Pressing while the help prompt is
playing will terminate the prompt
and a beep will be heard. Doing this
will stop the help prompt so that a
voice command can be used.
Voice Recognition for the
Radio
Select the screen button to
launch audio voice recognition.
If the voice button is pressed in a
radio screen, the voice commands
for radio and media features are
available.
Switch to AM : Switch bands to
AM and tune to the last AM radio
station.
Switch to FM : Switch bands to
FM and tune to the last FM radio
station.
Switch to XM : Switch bands to
SiriusXM and tune to the last
SiriusXM channel.
Infotainment System
Tune to <AM frequency> AM :
Tune to the radio station whose
frequency is identified in the
command (like nine fifty ).
Tune to <FM frequency> FM :
Tune to the radio station whose
frequency is identified in the
command (like one o one
point one ).
Tune to XM <XM channel
number> : Tune to the SiriusXM
radio station whose channel number
is identified in the command.
Tune to XM <XM channel
name> : Tune to the SiriusXM
radio station whose channel name
is identified in the command.
Voice Recognition for Audio
My Media
If browsing My Media when the
voice button is selected, the voice
recognition commands for My Media
features are available.
Play Artist : Begin a dialog to
enter a specific Artist name.
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