Chevrolet Uplander Owner's Manual page 263

When a CD is playing in the single CD player, press
this button to select the next track. This function
is inactive if the front seat passengers are listening
to a CD.
When a CD is playing in the six-disc CD changer,
press this button to select the next CD, if multiple CDs
are loaded. This function is inactive if the front seat
passengers are listening to a CD.
SRCE (Source): Press this button to switch between
playing the AM/FM tuner, front CD player, and XM™
Satellite Radio Service (if equipped). If one of the
sources are not loaded, the system will skip over the
source when this button is pressed.
X
(Headphone): Press the right or the left headphone
button to enable volume control of the wired headphone
connected to the corresponding jack. Press the right
and left arrow buttons to change the volume.
rj
(Parental Control): This button is located behind
the video screen, below the auxiliary jacks. Press this
button while using RSA, or when a DVD or CD is playing
to blank the video screen and to mute the audio. The
power indicator lights on the DVD player will flash.
Turning on the parental control will also disable all other
button operations from the remote control and the
DVD player, except for the eject button. Press this
button again to restore operation of the RSA, DVD
player, and remote control.
This button may also be used to turn the DVD player
power on and automatically resume play if the vehicle
is on and a disc is in the player. If no disc is in the player
then the system will power up in auxiliary mode.
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