2009 BMW 1' SERIES
E81 N47
65 02 05 (114)
Aerial system
E70, E71, E81, E82, E87, E88, E90, E91, E92, E93, R55, R56
Introduction
The number of radio services (transmission of messages by radio) in the vehicle is constantly growing: Services
for communication, navigation, radio and sensor systems. The number or aerials has also increased in line with
the additional radio services.
> E70 [system overview ...]
> E71 [system overview ...]
> E81, E87 [system overview ...]
> E88 [system overview ...]
1/14
Note: The description applies to vehicles with ”High” equipment level.
Depending on the vehicle's equipment specification, not all of the aerials described here may be
fitted. Attention will be drawn to differences due to certain equipment combinations or national
versions.
In principle, radio services can be separated into terrestrial services and satellite services. Terrestrial radio
services are broadcast via ground aerials (stationary aerials for terrestrial reception).
Terrestrial services include:
Satellite services include:
Aerials for vehicle systems (the aerials themselves are not dealt with in this SBT):
Most aerials are integrated in the rod aerial, roof-mounted aerial, side window and in the rear window.
> E82, E90, E92 [system overview ...]
> E91 [system overview ...]
> E93 [system overview ...]
> R55 [system overview ...]
> R56 [system overview ...]
- AM-FM radio transmitters (analogue)
- DVB-T (Digital Video Broadcasting - Terrestrial)
- TV transmitters (analogue)
- DAB (Digital Audio Broadcasting). DAB makes digital radio reception possible.
- GSM dual band 900/1800 MHz (for mobile phones)
- GPS (signals for navigation)
- SDARS (Satellite Digital Audio Radio Service, US version only)
- Aerials for remote control or Comfort Access
- Bluetooth aerial for connecting mobile phones to the vehicle
> E93
The E93 (Convertible) has no visible aerials apart from the SDARS aerial (US version) on the tailgate.
Different aerials are used for radio reception depending on the position of the convertible hardtop (closed or
open).
Convertible hardtop closed:
Radio reception using aerials (AM, FM 1, FM 3) in the rear window
Convertible hardtop open:
2/14
Radio reception using aerials (AM, FM 1) in the rear left side trim and the aerial (FM 3) in the rear right
side trim
Brief description of components
The aerials supply signals for the aerial system:
- FM aerial
The FM aerial receives radio stations and traffic information in the FM (VHF) range (FM stands for
”Frequency modulation”).
The number of FM aerials installed in the aerial system varies:
> E81, E87, E93
4 FM aerials (FM 1, FM 2, FM 3, FM 4)
> E70, E71, E82, E88, E90, E91, E92, plus
R55, R56
3 FM aerials: (FM 1, FM 2, FM 3)
For space-saving reasons, the FM 4 aerial does not exist physically. The FM 4 aerial is formed from the
HF signal of the FM 1 and FM 2 aerials by way of heterodyning. This improves FM reception.
- AM aerial
The AM aerial receives radio stations in the SW, MW and LW ranges (SW stands for ”short wave”; MW
stands for ”medium wave and LW stands for ”long wave”).
- TV aerial
The TV aerials receive analogue or digital television signals.
- DAB aerials (Europe version)
The DAB aerials picks up high-frequency signals (digital signals) from the radio transmitters (DAB: Digital
Audio Broadcasting).
Different DAB aerials are used for radio reception:
DAB L aerial (frequency range: L-band)
The DAB aerial is used for reception in urban areas.
DAB III aerial (frequency range: III-band)
The DAB aerial is used for regional reception.
- GPS aerial
The GPS aerial picks up navigation signals transmitted by GPS satellites (GPS:. Global Positioning
System).
- Telephone aerial
3/14
The telephone aerial is designed for the GSM mobile communication network and for other services, e.g.
CDMA. (GSM stands for ”Global Standard for Mobile Communication”; CDMA stands for ”Code Division
Multiplex Access”)
- Emergency GSM aerial
The emergency GSM aerial is installed in vehicles with TCU (TCU stands for ”Telematics Control Unit”)
An emergency call can be transmitted through the emergency GSM aerial if the external telephone aerial
is not working, because of an accident, for example.
[more ...]
- SDARS aerial (US version)
> E70, E71, E82, E88, E90, E91, E92, E93 plus
R55, R56
High-frequency signals (digital signals) from satellites and stationary aerials for terrestrial reception are
picked up by an SDARS aerial on the vehicle. (SDARS stands for ”Satellite Digital Audio Radio
Service”)
An aerial cable routes the signals to the satellite tuner.
[for more information, please refer to SI Technology (SBT) 65 03 03 058]
- VICS aerial (Japan version)
Information relating to the current road traffic situation is acquired from several locations and transferred
to the VICS control centre. (VICS stands for ”Vehicle Information and Communication System”)
Information is provided by radio and infrared transmission for the current stretch of road. Information is
provided both in text and graphic form.
> E70, E71
The E70, E71 has 2 aerials.
One aerial is integrated in the interior mirror, the other in the rear window.
> E81, E82, E87, E90, E91, E92
The aerial is integrated in the interior rear-view mirror.
> E88, E93
The aerial is installed in the mirror base of the inside mirror.
> R55
The R55 has 2 aerials.
One aerial is integrated in the interior mirror, the other in the rear left side window.
> R56
The R56 has 2 aerials.
One aerial is integrated in the interior mirror, the other in the rear window.
4/14
The individual aerials are integrated in the aerial system as follows:
- Aerials in rod aerial
[more ...]
> E81, E87
The rod aerial contains the aerials for AM, FM 1, telephone, GPS and DAB (frequency range: L-band).
> E88
The rod aerial contains the aerials for AM, FM 1 and telephone.
> R55, R56
Depending on the vehicle's equipment specification, up to 6 different equipment versions are possible.
- Aerials in the roof-mounted aerial
> E70, E71, E82, E90, E91, E92
The following roof-mounted aerials are fitted:
Roof-mounted aerials with aerials for telephone, GPS and DAB (Europe version).
Roof-mounted aerial with telephone, telephone 2, GPS and SDARS (US version)
The US version of the roof-mounted aerial is noticeably larger than the Europe version. Depending on the
vehicle's equipment specification, up to 5 different equipment versions are possible.
[more ...]
- Aerial in the rear window
> E70, E71, E82, E87, E90, E91, E92, E93, R56
Conductors pressed onto the heated area of the rear window act as aerials. The heated area connections
for the heated rear window are decoupled from the aerials by rejector circuits.
[more ...]
- Aerials in side window
> E70
The television aerial (TV 2) is integrated into the rear right side window.
The following aerials are integrated into the rear left side window:
TV aerial (TV 1)
DAB aerial (frequency range: III-band)
[more ...]
> E91
The television aerial (TV 2) is integrated into the rear right side window.
The television aerial (TV 1) is integrated into the rear left side window.
5/14
[more ...]
> R55
The television aerial (TV 2) is integrated into the rear right side window.
The following aerials are integrated into the rear left side window:
TV aerial (TV 1)
DAB aerial (frequency range: III-band)
FM aerial (FM 2)
FM aerial (FM 3)
VICS aerial (VICS 2) for Japan navigation system
> R56 in Japan national version
One TV aerial is integrated in the rear left and rear right side window. The TV aerials (TV 3 on the left in
the direction of travel; TV 4 on the right in the direction of travel) have their own TV aerial amplifier. The
aerial amplifier sends the signals from the 2 TV aerials to the control unit for the Japan navigation system.
- Aerial on tailgate
The aerial on the tailgate is of a similar design to the roof aerial, but it is much flatter.
> E88 Europe version
DAB aerial (frequency range: L-band)
> E88, E93 US version
SDARS aerial
- Aerials in the rear left and rear right side trims
> E93
When the convertible hardtop is open, radio stations are received using the aerials in the rear right and
rear left side trims.
The following aerials are fitted in the rear left and rear right side trims:
AM and FM aerial (FM 1)
FM aerial (FM 3)
[more ...]
- Aerials under the rear bumper trim
The following aerials are installed under the rear bumper trim:
> E71
TV aerial (TV 2):
6/14
under the rear left bumper trim
TV aerial (TV 3):
under the rear right bumper trim
[more ...]
> E81, E87
Telephone aerial (GSM 1):
under the rear left bumper trim
> E88
FM aerial (FM 2)
under the rear centre bumper trim
FM aerial (FM 3):
under the rear left bumper trim
Telephone aerial (GSM 2) for telematic services:
under the rear left bumper trim
DAB aerial (frequency range: III-band)
under the rear right bumper trim
[more]
> E93
FM aerial (FM 4):
under the rear left bumper trim
TV aerial (TV 1):
under the rear left bumper trim
GSM aerial (GSM 2):
under the rear left bumper trim
FM aerial (FM 2):
under the rear centre bumper trim
DAB aerial (DAB III):
under the rear right bumper trim
7/14
The following components are involved in operation of the aerial system:
Note: From 03/2008, aerial diversity is discontinued on the E81, E87 with BMW Audio radio (basic version).
From 03/2008, aerial diversity is discontinued on the E81, E87 with BMW Audio radio (basic
version) The combination BMW Audio radio (basic version) and aerial diversity is only possible in
conjunction with option 676 ”HiFi loudspeaker system”.
TV aerial (TV 2):
under the rear right bumper trim
[more ...]
- Aerial behind the front left wheel arch cover
> E93
The telephone aerial is fitted behind the front left wheel arch cover. The telephone aerial (GSM 1) is
directly connected to the eject box.
- Aerials in cowl panel
> E93
DAB aerial (frequency range: L-band)
GPS aerial
- Aerials in the folding top compartment lid
> E88
The GPS aerial is installed from below in the folding top compartment lid, left.
- Aerial amplifier with aerial diversity for FM
The aerial amplifier compensates for losses that occur in the aerial line. The aerial diversity function
makes available the signal from the aerial with the best reception to the radio.
> E81, E87
The aerial amplifier for the FM aerial (FM 1) and for AM aerial is located in the base of the rod aerial.
The aerial amplifier with aerial diversity for the FM 2 to FM 4 aerials is installed on the inside of the boot
lid above the rear window in the area of the auxiliary brake light.
- > E88
The aerial amplifier for the FM aerial (FM 1) and for AM aerial is located in the base of the rod aerial.
The aerial amplifiers for the FM aerials (FM 2, FM 3) are integrated in the aerial amplifier with aerial
diversity. The aerial amplifier with aerial diversity is at the rear left in the luggage compartment.
> E70, E71, E82, E90, E91, E92
8/14
[more ...]
The aerial amplifier with aerial diversity is installed above the rear window in the area of the auxiliary
brake light.
Other aerial amplifiers are also housed in the AM/FM aerial amplifier housing:
Aerial amplifier for television aerial
> E82: TV function cannot be ordered as special equipment.
Aerial amplifier for DAB (Digital Audio Broadcasting)
Moreover, the remote control receiver for unlocking the vehicle is also integrated into the module.
> E93
The aerial amplifier with aerial diversity is at the rear left in the luggage compartment.
The following aerial amplifiers are fitted in the aerial amplifier housing:
Aerial amplifier for FM aerial (FM 2)
Aerial amplifier for FM aerial (FM 4)
> R55
The aerial amplifier with aerial diversity is installed at the top of the left-hand C-pillar. Other aerial
amplifiers are also housed in the AM/FM aerial amplifier housing:
Aerial amplifier for TV aerial (TV 2)
Aerial amplifier for DAB (Digital Audio Broadcasting)
> R56
The aerial amplifier with aerial diversity is located on the inside of the tailgate, under the rear window
(between the rear window wiper and the C-pillar). Other aerial amplifiers are also housed in the AM/FM
aerial amplifier housing:
Aerial amplifier for TV aerials (TV 1 and TV 2)
Aerial amplifier for DAB (Digital Audio Broadcasting)
- Compensator
The compensator equalises losses in the telephone aerial wire. The compensator can be retrofitted at the
customer's express wish to improve reception.
[more ...]
- Suppressor filter
The suppressor filter suppresses interference from the rear window aerials in the additional brake light
wires. Filter circuits in the interference suppression filter are designed to suppress conducted
interference. The interference suppression filter is located in the positive and earth cable of the auxiliary
brake light.
> E81, E87
9/14
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2009 BMW 1-Series E81 Service and Repair Manual
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Description
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- Model: 2009 BMW 1-Series E81
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