BMW 3 (E46). Manual — part 293
650-1
General
This section covers the BMW factory-
installed sound system, including
radio, amplifier and speaker removal.
Radio antenna information is also
included.
Special tools
Use BMW special tool 00 9 321 or
equivalent plastic prying tool to pry out
plastic interior parts without damage or
marring.
Plastic prying tool BMW 00 9 321
General
A tag on the bottom of the radio
contains the serial number (A) and
model number (B).
Sound system
The standard E46 radio features a
cassette player. The optional radio has
a single in-dash CD player. Both radios
are prewired for the optional CD
changer that mounts in the trunk.
Another option, the On-Board Monitor,
integrates GPS navigation with radio
and IHKA controls. Basic radio controls
are also incorporated in the steering
wheel.
Sound system components are
interconnected via K-bus. Theft
proofing of the radio by code is no
longer required as the radio will not
function without the K-bus connection
and a valid signal from the instrument
cluster.
Other features of the sound system
include:
Autostoring of stations
Speed dependent volume
Telephone muting
Diversity antenna, described later in
this group, is optional on some models
and standard on the Convertible and
Sport Wagon.
RDS
Radio Data System (RDS) is a transmit
and receive system operated in the FM
band. It is a data service offered by
radio stations in which the information
is transmitted inaudibly with the audio
programs. The name of the station is
displayed in the radio when the RDS
system is active. Program identification,
program service name and RDS quality
are also displayed.
Troubleshooting
Although electronic radio and sound
system troubleshooting is beyond the
scope of this manual, there are number
of self-tests that are possible with the
standard BMW radio installed in E46
cars.
Radio test functions are activated by
pressing the M button within 8 seconds
of switching the radio on. Hold it
pressed in for 8 seconds to start the
tests.
The test functions include:
Radio serial number
Software version display
Speed dependent volume control
adjustment
Station signal strength, including
FM frequency set, signal strength
and quality of signal received
AM frequency set and signal
strength
The test also checks antenna
functions:
Antenna signal strength (F
number) indicates the quality of
the signal received by the
antenna. The scale ranges from 0
to 15, with the optimum value
being 15. If the value falls below
10, radio stations can not be
listened to in stereo.
650-2
Radio and Audio
Accessories
Radio, removing and installing
CAUTION!
Before beginning work on the
radio or sound system, verify
that the radio is an original
equipment BMW radio and that
the wiring harness has not been
modified.
Servicing of aftermarket sound
equipment should be referred to
an authorized agent of the
equipment's manufacturer.
Note:
On-Board Monitor removal is covered
in
640 Heating and Air Conditioning
.
-
Prying gently, remove right
dashboard trim, then center
dashboard trim.
CAUTION!
To avoid marring interior trim, work
with a plastic prying tool.
Remove radio mounting screws
(arrows).
-
Pull radio out of instrument panel
opening. Detach electrical harness
connector and antenna lead.
-
Installation is reverse of removal.
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