GMC 2011 Sierra - Manual (Page 240)

Black plate (14,1) GMC Sierra Owner Manual - 2011
7-14 Infotainment System
Radio Reception
Frequency interference and
static can occur during normal
radio reception if items such
as cell phone chargers, vehicle
convenience accessories, and
external electronic devices are
plugged into the accessory power
outlet. If there is interference or
static, unplug the item from the
accessory power outlet.
AM
The range for most AM stations is
greater than for FM, especially at
night. The longer range can cause
station frequencies to interfere
with each other. For better radio
reception, most AM radio stations
boost the power levels during the
day, and then reduce these levels
during the night. Static can also
occur when things like storms and
power lines interfere with radio
reception. When this happens, try
reducing the treble on the radio.
FM Stereo
FM signals only reach about
16 to 65 km (10 to 40 miles).
Although the radio has a built-in
electronic circuit that automatically
works to reduce interference, some
static can occur, especially around
tall buildings or hills, causing the
sound to fade in and out.
XM™ Satellite Radio Service
XM Satellite Radio Service gives
digital radio reception from coast
to coast in the 48 contiguous
United States, and in Canada.
Just as with FM, tall buildings or
hills can interfere with satellite radio
signals, causing the sound to fade
in and out. In addition, traveling
or standing under heavy foliage,
bridges, garages, or tunnels may
cause loss of the XM signal for a
period of time.
Cellular Phone Usage
Cellular phone usage may cause
interference with the vehicle's
radio. This interference may occur
when making or receiving phone
calls, charging the phone's battery,
or simply having the phone on.
This interference causes an
increased level of static while
listening to the radio. If static is
received while listening to the
radio, unplug the cellular phone
and turn it off.