GMC 2010 Sierra Owner's Manual page 361

Parental Control can also be turned off by inserting or
ejecting any disc, pressing the play icon on the radio
DVD display menu, or changing an ignition position.
Headphones
The RSE includes two 2-channel wireless headphones
that are dedicated to this system. Channel 1 is
dedicated to the video screen, while Channel 2 is
dedicated to RSA selections. These headphones can
used to listen to the radio, CDs, DVDs, MP3s, DVDAs,
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.
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
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 may 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.
Notice: Do not store the headphones in heat or
direct sunlight. This could damage the headphones
and repairs will not be covered by the warranty.
Storage in extreme cold can weaken the batteries.
Keep the headphones stored in a cool, dry place.
If the foam ear pads attached to the headphones
become worn or damaged, the pads can be replaced
separately from the headphone set. Refer to your dealer
for more information.
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