AUDI A4 2001 B5 / 1.G Technical Features Design And Function

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Interface for Navigation Plus (R94)
The interface of the Navigation System Plus
performs the following tasks:
– Exchange of data bus information -
Navigation System Plus internal data bus
– Transfer of TMC data to the Navigation
System Plus for dynamic route planning
In order to receive the TMC data, an interface
connects the aerial and radio.
The following data is exchanged via the
interface:
Display request/instrument cluster
Traffic news/Telematics
Fault messages/card reader
Control signals/multi-function
steering wheel
Terminal 15/steering column
electronicsDisplay/instrument cluster
Control signals data bus/data bus
information system
Vehicle data/card reader Input from data bus
information/senderOutput to data bus
information/receiver
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TS
TS

Multi-communication bar (MCB)
The Audi A4 Saloon features the multi-com-
munication bar in the top part of the rear win-
dow for the first time.
The
– aerial module,
– aerial for navigation system (GPS),+
– and aerial for telephone (GSM)
are fitted in the MCB.
The
– aerial diversity,
– aerial amplifier for the four radio aerials
(FM1-4, AM),
– 4 aerial amplifiers for the TV aerials 1-4,
– aerial for radio remote control, central lock-
ing (RCL),
– and the aerial for the telestart function (TS)
of the auxiliary heating
are integrated in the aerial module.
The aerial conductor is located in the rear
window. The electrical connection between
the aerial amplifier and the conductor on the
rear window is made by means of spring
contacts.
Both the GPS and the GSM aerials are also
fitted in the top edge of the rear window, but
these are not connected by means of conduc-
tors in the rear window.
Thanks to this compact arrangement, no
aerials are visible from outside.
The emergency aerial for the telematics is
located at the rear bumper.
Electrical system
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GSMGPS
Aerial module
Normal glazing
Insulating glazing

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Television (TV) tuner
The image and sound quality of each individ-
ual tuner is monitored in the TV tuner. The
tuner with the best reception is switched
through to the operating unit.
Thanks to the high speed, switching can be
performed within a single scanning line.
The control signals of the Navigation Plus -
operating unit are transmitted via the data
bus system of the navigation system.
Transfer of the image and sound data takes
place via the conventional wiring.
The TV tuner is not connected to the data bus
information system.
Self-diagnosis
Address word 57
The video standard for the relevant country
can be set via the coding function.
The TV aerials can be activated for reception
consecutively in the final control diagnosis,
enabling the detection of a faulty aerial.
The condition of the connections to the
aerials, navigation system and external video
inputs can be displayed via the measured
value blocks.
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Electrical system
The electronic logbook, Audi Logbook
The Audi Logbook is a fully automatic logbook
which allows the customer to calculate
business and private journeys in order to
determine costs, e.g. for tax purposes.
The Audi Logbook is only available in
conjunction with Navigation Plus or
Navigation IV.
The Audi Logbook System includes:
– Chip card reader R99,
– PC card reader,
– Software CD for installing the Audi
Logbook program on the PC,
– Chip card.For initial operation of the Audi Logbook, the
chip card must be activated using a PC and
PC card reader (see Owner's manual).
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CAN bus information
+ -
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In the ”business journey” mode, data relating
to
– date
– time at start of journey
– position at start of journey
– position at end of journey
– time at end of journey
– kilometres driven
are stored in the Chip card reader R99.
The date and route driven are stored In the
”private journey” mode.
The ”continue journey” mode is used to pre-
vent short breaks from being stored (e.g. refu-
elling stops).
Operation and setting of the Audi Logbook is
via the navigation system menu.
The following options can be selected:
– Business journey
– Private journey
– Continue journey
Around 250 individual journeys can be stored
on the chip card.
Once 200 individual journeys have been
stored in the card reader, the driver is
requested by a message on the navigation
system display to store the data on the chip
card.
The card reader has the capability to store
around 2700 individual journeys.The Audi Logbook has no diagnostic
capability.
Fault messages are indicated via the naviga-
tion system display.
The messages displayed are generated in the
chip card reader and communicated to the
navigation system as information via the data
bus.
In order to activate the Audi Logbook,
adaption of the navigation unit must be
performed. (see workshop manual).
Select purpose of journey:
Back
Business journey
Private journey
Continue, business
Continue, private
Memory occupancy 0 %
LOGBOOK Back with RETURN
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Heater/AC
Operating and display unit E87.
The redesigned system is based on the
performance data for top of the medium
range vehicles, taking account of low system
weight and energy consumption as well as, to
an increasing extent, recycling capability.
The operating and display unit E87 is
connected to the convenience CAN bus.
Diagnosis takes place via the K-wire.
Design and function
The air conditioner represents a further devel-
opment of the two-zone air conditioning
concept previously used in the A6.
Innovations include:
– Individual temperature control for both
driver and front passenger
– Option of synchronising the temperature
zones for driver and front passenger by
pressing the ”Auto” button for approx.
three seconds.
Example:
If the same temperature is desired for the
passenger’s side as for the driver’s side,
the ”Auto” button should be pressed for at
least three seconds.
The same applies the other way round, for
making the driver’s side temperature the
same as that of the passenger’s side.
– The fault diagnosis and measured value
blocks for the seat heating system are read
out via address word 08 for the air condi-
tioner.
– The system is encoded automatically via
the dash panel insert.– Integrated rotary control knob with poten-
tiometer for seat heating.
(this means the potentiometers cannot be
replaced individually)
– Intake blower V42 for passenger compart-
ment temperature sensor G56 is integrated
and cannot be replaced individually.
A distinction is made between eight different
versions, identified by means of the part
number index:
– with or without seat heating
– with or without navigation system,
– at a later date, with or without air quality
sensor.

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Two versions of externally controlled com-
pressors are used in the Audi A4:
– the 6-piston compressor, which you have
already studied in detail in SSP 240,
– the 7-piston compressor, which differs in
the number of pistons and the resulting
increased displacement.
Depending on the country-specific vehicle
version, the 7-piston compressor with its
higher total output is used (e.g. in hot coun-
tries).
Based on the engine version installed, a dis-
tinction is made between the following com-
pressor
types:
– 6 and 7 pistons for compressor fitted on
right side of engine,
– 6 and 7 pistons for compressor fitted on
left side of engine,
– 6 pistons for 6-cylinder TDI Diesel mechani-
cal units.
Vehicles equipped with a 7-piston
compressor, are fitted with a radiator fan
which has a higher output. Distinguishing features to identify the com-
pressor fitted are:
– Lettering on the compressor identification
plate is 6SEU for the 6-cylinder or 7SEU for
the 7-cylinder compressor.
– the greater outer diameter of the
7-cylinder compressor (approx. 122 mm)
compared to the smaller outer diameter of
the 6-cylinder compressor
(approx. 113 mm)
7-piston compressor

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Air conditioner
Heater/AC
Defrost
flaps
Flaps for
centre ventDefrost flap control
motor V107
Temperature
flap (upper)
Left temperature
flap control
motor V158Right tempera-
ture flap control
motor V159
Temperature
flap (lower)
Flaps for footwell
ventFootwell vent tempera-
ture sender (left) G261Footwell vent tempera-
ture sender (right) G262
Sender for outlet
temperature,
evaporator G263 Central flap
control motor V70
Temperature
sensor - fresh air
intake channel G89
Fresh air/air-
flow flap
Air recirculation
flap control
motor V113
Motor for air flow
flap V71
Recircula-
ted-air flap
Vent temperature
sender
left right
G150 G151
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The basic functions of the air conditioner in
the Audi A4 are based on the Audi A6 system
and includes the following features:
– Air-side separation for driver’s and passen-
ger’s side.
– The heat exchanger can be replaced with-
out removing the air conditioner.
– The PTC additional heater element for die-
sel mechanical units can also be replaced
without removing the unit.
– All control motors and potentiometers are
easily accessible and replaceable.
– Connecting hose from air conditioner to
glove compartment for supplying the glove
compartment cooler (optional).
(in vehicles without glove compartment
cooling, the connection is sealed with a
rubber plug).
– Modified fresh air blower for passenger
compartment (description, see section:
Fresh air blower/electronically controlled
fresh air blower, on page 81).
Connecting hose to glove
compartment cooler
Glove compartment cooling
The cooler fills the entire space of the glove
compartment. It can, for instance, hold two
bottles with a volume of 0.25 and 0.7 litres.
The cold air supply is achieved via a connect-
ing hose from the air conditioner unit.
The hose is fitted with a rotary slide for cold
air regulation.
Two examples give an impression of its per-
formance:
– Cooling of the cooler contents from
approx. +30 °C to approx. +16 °C within one
hour and
– after switching off the cold air supply,
warming up by approx. +4 °C per hour at an
ambient temperature of approx.
+30 seconds and exposure to the sun.
Rotary valve
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Heater/AC
Significant advantages in comparison with
vehicles without solar roof are:
– lowered temperature level in vehicles
parked in the sun (see chart),
– increased efficiency of the air conditioner
as the interior temperature set is achieved
more quickly,
– despite the reduced output of the system
during the winter, an air-drying effect
occurs which effectively dehumidifies the
vehicle, reducing fogging of the windows.
Solar roof
For the first time, the A4 can optionally be
equipped with the solar roof previously used
in the A8 and A6.
The fresh air blower is continually driven by
electricity obtained from solar radiation.
The output is proportional to the intensity of
the sunlight.
Modifications to the familiar models:
– Re-engineered fresh air blower
– The DC/DC transformer has been discontin-
ued, its function is now performed by the
fresh air blower control unit J126.
Time [min]
Temperature [°C]
Radiation [W/m

2

]
Ventilation
Air conditioner
with control
systemSolar generator
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Contacts
Heating without solar
Heating with solar
Global radiation