Owner's Manual for the vehicle. With a quick reference ... - E38.org

Cellular phone
Radio reception
131n
Mobile communications systems (cellular
phone, radio, etc.) are permitted with
an output up to 10 watts only. Even
these systems may trigger malfunctions
in the operation of your vehicle if they
are not specifically designed for use
with the vehicle. BMW can neither test
nor assume responsibility for every individual
product being offered on the
market. We recommend that you consult
your BMW center before purchasing
any device of this kind.
To ensure that your BMW continues to
provide reliable and trouble-free operation,
refrain from using a cellular phone
or other radio device with an antenna
located inside the passenger compartment.
The antenna should always be
mounted on the outside of the vehicle.
Before loading the vehicle on a
car-carrier train or driving it
through a car-wash, remove the antenna.<
The reception and sound quality obtained
from mobile radios varies according
to a variety of factors, including
the broadcast range of the transmitter
and the directional orientation of the
antenna. Interference factors such as
high-tension power lines, buildings and
natural obstructions can all lead to unavoidable
reception interference, regardless
of how well the vehicle sound
system is operating.
Climatic factors such as intense solar
radiation, fog, rain and snow can also
interfere with reception.
Cellular phones without official BMW
approval can also generate interference.
This phenomenon assumes the
form of a low-pitched hum emanating
from the speaker system.
Please refer to the supplementary operating
instructions provided with your
sound system for detailed information
on its use.
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