GMC 2009 Yukon XL Owner's Manual page 310

Headphones
The RSE includes two 2-channel wireless headphones
that are dedicated to this system. Channel 1 is dedicated
to the DVD player, while Channel 2 is dedicated to RSA
selections. These headphones are used to listen to
media such as CDs, DVDs, MP3s, DVDAs, radio, any
auxiliary source connected to A/V jacks, or the auxiliary
input jack, if the vehicle has this feature. The wireless
headphones have an On/Off button, channel 1/2 switch,
and a volume control.
If the vehicle has a third row video screen display,
it may have two additional headphones.
3-126
Push the power button to turn on the headphones.
An indicator light located on the headphones comes on.
If the light comes on but there is intermittent sound
and/or static on the headphones, or if the indicator light
does not come on, the batteries might need to be
replaced. See "Battery Replacement" later in this section
for more information. Switch the headphones to Off
when not in use.
Infrared transmitters are located at the rear of the
RSE overhead console. The headphones shut off
automatically to save the battery power if the RSE system
and RSA are shut off or if the headphones are out of
range of the transmitters for more than three minutes.
If you move too far forward or step out of the vehicle, the
headphones lose the audio signal.
The headphones automatically turn off after four hours
of continuous use.
To adjust the volume on the headphones, use the
volume control located on the right side.
For optimal audio performance, the headphones must
be worn correctly. Headphones should be worn with
headband over the top of the head for best audio
reception. The symbol L (Left) appears on the upper left
side, above the ear pad and should be positioned on
the left ear. The symbol R (Right) appears on the upper
right side, above the ear pad and should be positioned
on the right ear.