GMC 2006 Sierra 1500 Pickup Owner's Manual page 304

Problem
Sometimes the wireless
headphone audio cuts out
or buzzes.
I lost the remote and/or
the headphones.
The DVD is playing,
but there is no picture
or sound.
The audio/video skips or
jumps.
The audio from the radio
for the Radio with Six-Disc
CD and XM™ has taken
over the audio from the
DVD or CD when using
the wired headphones.
3-126
Recommended Action
Check for obstructions,
low batteries, reception
range, and interference
from cellular telephone
towers or by using your
cellular telephone in the
vehicle.
Check that the
headphones are facing
the front of the vehicle.
See your dealer for
assistance.
Check that the DVD player
is in DVD mode.
The DVD or CD could
be dirty, scratched, or
damaged.
The RSE is working
correctly.
Use the wireless
headphones or have the
front seat passengers
listen to another audio
source.
DVD Messages
The following errors may be displayed on the video
screen:
Disc Format Error: This message will be displayed if a
disc is inserted upside down, if the disc is not readable,
or if the format is not compatible with the DVD player.
Load/Eject Error: This message will be displayed if the
disc is not properly loaded or ejected.
Disc Play Error: This message will be displayed if the
DVD player cannot play the disc. Scratched or damaged
discs will cause this error.
Region Code Error: This message will be displayed if
the region code of the DVD is not compatible with the
region code of the DVD player.
No Disc: This message will be displayed if any of the
buttons on the DVD faceplate or remote control are
pressed and no disc is present in the DVD player.