GMC Yukon 2012 Owner's Manual page 248

7-42 Infotainment System
u
(Next Track/Chapter): Press
this button to go to the beginning of
the next chapter or track. This
button might not work while the
DVD is playing the copyright
information or the previews.
r
(Fast Reverse): Press this
button to quickly reverse the DVD or
CD. To stop fast reversing a DVD
video, press the play/pause button.
To stop fast reversing a DVD audio
or CD, release the fast reverse
button. This button might not work
when the DVD is playing the
copyright information or the
previews.
[
(Fast Forward): Press this
button to fast forward the DVD or
CD. To stop fast forwarding a DVD
video, press the play/pause button.
To stop fast forwarding a DVD audio
or CD, release the fast forward
button. This button might not work
while the DVD is playing the
copyright information or the
previews.
e
(Audio): Press this button to
change audio tracks on DVDs that
have this feature when the DVD is
playing. The format and content of
this function vary for each disc.
{
(Subtitles): Press this button to
turn on or off subtitles and to move
through subtitle options when a
DVD is playing. The format and
content of this function vary for
each disc.