GMC Sierra 2015 Owner's Manual page 207

7-4 Infotainment System
1. (Favorite Pages)
Press to scroll down through
the favorite pages for each
source.
2. Favorites/Soft Keys
Press to select favorite
stations.
Press and hold to save
favorite stations.
Press to select a screen
button when displayed.
Radio with TONE
3. (Favorite Pages)
Press to scroll up through the
favorite pages for each
source.
4. (Power/Volume)
Press to turn the audio on.
Press and hold to turn it off.
When on, press to mute the
system. Press again to
unmute.
Turn to increase or decrease
the volume.
5. MEDIA
Press to change the audio
source between CD, USB,
SD card, AUX, and Bluetooth
Audio, if equipped.
6. RADIO
Press to change the audio
source between AM, FM,
or SiriusXM, if equipped.
7. or (Seek)
CD (If Equipped): Press
to seek the beginning of the
current or previous track.
If the track has played for
less than five seconds, it
seeks the previous track.
If longer than five seconds,
the current track will start
from the beginning. Press
to seek the next track.