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

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Important:
Note
New

Contents
It is not intended as a workshop manual.
The self-study programme will provide you with information on
design and functions.
For maintenance and repair operations it is essential that you
refer to the current technical literature.
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Occupant protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Engine and gearbox
Running gear
Axles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Mechanical unit mountings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Brake system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Brake assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Vehicle electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
CAN BUS system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Dash panel insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Steering column switch module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Function circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Control unit for vehicle electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Function circuit diagram for "lowline" version . . . . . . . . . . . . . . . . . . . . . 50
Function circuit diagram for "highline" version . . . . . . . . . . . . . . . . . . . . 52
Convenience system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Anti-theft alarm system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Radio - chorus II, concert II and symphony II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Navigation IV and Navigation Plus-D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Multi-communication bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Electric logbook "Audi Logbook" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Heater/AC
Design and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
7-piston compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Air conditioner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Glove compartment cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Solar roof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Fresh air blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Actuators/sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Functional diagram for fully automatic air conditioner . . . . . . . . . . . . . . 84
Additional heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 2.0 l R4 and 3.0 l V6 engines (see SSP 255) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Innovations - 2.5 l V6 TDI engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Innovations - automatic gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electrical system

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High safety standards
With a thoroughly optimised body design and
comprehensive safety equipment, the new
Audi A4 is able to comply with all current valid
safety standards, throughout the world.
Crash sensors for the front airbags integrated
directly into the bumper bar, improve occu-
pant protection.
Finely-tuned aerodynamics
Despite the greater frontal area and the cool-
ing air current for the air conditioner (stand-
ard), it was possible to improve the C
D

value
by 5 %, in comparison to its predecessor,
to 0.28.
A special feature is the so-called aero-floor,
which provides for optimal airflow on the
underside of the vehicle.
Communication centre on wheels
With regard to infotainment, the new
Audi A4 leaves nothing to be desired.
4 different audio systems, 2 differently config-
ured Navigation systems and a car phone
with voice operation are on offer.
Electronic stability programme (ESP)
including brake assistant
For the latest ESP generation, the hydraulic
brake assistant is an integral part of the
standard equipment.
It is intended to assist the driver by automati-
cally increasing the brake pressure during
emergency braking.
SSP254_048

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CAN data bus
The Audi A4 is equipped with a widely
extended CAN data bus system.
Due to the ever increasing number of control
units installed in the vehicle and the associ-
ated requirement for data exchange, the
importance of the CAN data bus system
increases significantly.For communication between the
installed control units and the diagnos-
tic tester, two diagnosis wires (K and L)
are available.
The newly developed adapter VAS 6017 ena-
bles communication with all control units.
Drive BUS 500 kBaud
Convenience BUS 100 kBaud
Display BUS 100 kBaud
Diagnosis connection
K wire
Diagnosis connection
L wire (2nd K wire)
J402 Control unit for operating electronics,
navigation, TV tuner
J446 Control unit for parking aid
J453 Control unit for multi-function
steering wheel
J499 Control unit for telematics
J502 Control unit for tyre pressure monitor
J507 Control unit for speech entry
J519 Control unit for vehicle electrical
system
J526 Control unit for telephone -
permanent installation
J527 Control unit for steering column
electronics
R Radio
R94 Interface for navigation
R99 Chip card reader G85 Steering angle sender
E87 Operating and display unit for
air conditioner
J104 Control unit for ESP
J136 Control unit for seat adjustment with
memory, optional
J162 Auxiliary heater, optional
J217 Control unit for automatic gearbox
J220 Control unit for motronic
J234 Airbag control unit
J285 Control unit with display unit in
dash panel insert
J345 Control unit for trailer recognition
J386 Door control unit, driver’s side
J387 Door control unit, passenger side
J388 Rear left door control unit, optional
J389 Rear right door control unit, optional
J393 Central control unit for convenience
system
J401 Navigation system control unit
SSP254_112

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Electrical system
Setting buttons for digital clock,
date and instrument illuminationAuto-check system
Call-up button for
service interval
indicatorReset button for trip
recorder
Dash panel insert
There are two dash panel insert versions:
– "lowline"
– "highline"
The "highline" version is equipped with a
high-quality colour display for the driver infor-
mation system and is installed in vehicles
with navigation systems as well as telematics.The dash panel insert of the new Audi A4 is
equipped with
– the gateway for linking the three data bus
systems: drive, convenience, information
– and the immobiliser III.
Cruise control system ON
SSP254_012

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In order to ensure good signal reception for
the radio clock, the receiver is installed in the
rear bumper bar. User prompt in the centre display via the con-
trol switch in the centre console, is only avail-
able in vehicles with
– navigation system ("highline" version only)
and/or
– telematics and/or
– auxiliary heater and/or
– tyre pressure monitoring.
The optional driver information system
includes the following functions:
– radio clock
– auto-check system
– on-board computer.
The km range is indicated in the basic ver-
sion.
Ear
th
Radio signal
+ 5
V

SSP254_104
SSP254_108

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Radio symphony II
A 6x CD changer as well as a cassette player
are integrated in the symphony II radio.
Searching for alternative frequencies is
speeded up by the use of a second tuner. The
second tuner also allows for Traffic Message
Channel (TMC) evaluation in the background.
For further information, please refer to the
relevant operating instructions.
CAN networking in the new generation of
radios
All three radio versions are connected to the
data bus information system.
Important signals via the data bus informa-
tion system:
SSP254_006
– Ignition on/steering column-
electronics
– Ignition key inserted/steering
column electronics
– Switch illumination/dash panel
insert
– Display illumination/dash panel
insert
– Speed/dash panel insert
– Convenience coding/dash panel
insert
– Vehicle identification/dash
panel insert
– Prompt signal/data bus informa-
tion
– Data bus system information/
dash panel insert
– Time/dash panel insert
– Control signals from multi-func-
tion steering wheel/steering
column electronics– Display functions/dash panel
insert
– Sleep signal/data bus informa-
tion
– TMC data for symphony II/
navigation system
– Convenience coding request/
dash panel insert
Inputs/sourceOutputs/receiver

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Navigation IV and Navigation Plus-D
The new Navigation System IV and Navigation
System Plus-D are equipped with the dynamic
routing system.
The following traffic hold-ups are taken into
account during route planning:
– closed roads
– tailbacks and
– slow-moving traffic.
The system’s sources of information are the
traffic information from the radio stations via
the Travel Message Channel and from the
telematics
®

(optional) via the telephone
connection.
Once it is switched on, the navigation system
takes account of the traffic messages within a
radius of approx. 50 km around the vehicle.
If the route planning is activated, any hold-
ups are taken into consideration.
New hold-ups which arise are immediately
accounted for in the routing and the driver is
re-routed.
Data transfer of the traffic data is by
– Travel Message Channel data from the
radio
– Telephone data from the telematics control
unit J526
to the navigation system via the data bus
information system.
Selectivity area for traffic
messages, 50 km
major diversion
Tailback
local diversion
SSP254_129
SSP254_113

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TELE
RETURN
INFO
NAV
Menu

Within the menu structure of the navigation
system, the driver is able to
– switch the dynamic routing on and off,
– select the source of traffic information,
– manually exclude route sections from the
route planning.
For further information, please refer to the
operating instructions.
Travel Message Channel (TMC)
The TMC is a component of the Radio Data
System (RDS), which is transmitted by the
radio stations.
The information in the TMC includes the loca-
tion, type and duration of traffic hold-ups
reported by the police, automobile associa-
tions and government authorities in a coded
form standard throughout Europe.
The TMC data is not currently transmitted by
all radio stations.
This requires the use of a second tuner in the
radio or in the interface of the Navigation
System Plus.
As only the symphony II radio is equipped
with a second tuner, the use of TMC data for
dynamic routing is only possible with this
version.
Dynamic routing in conjunction with the
chorus II and concert II radios is only possible
by means of the traffic messages via tele-
phone with telematics
®

.
Diagnostics
The navigation system diagnostics is interro-
gated via the L-wire.
Electrical system
SSP254_130
1 Traffic information is available.
Source: Radio
Alternative route Traffic information
now automatic
for route section
for route from hereread
interrogate latest
Settings
Tailback function Back with RETURN

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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
SSP254_122

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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
SSP254_109
SSP254_013
GSMGPS
Aerial module
Normal glazing
Insulating glazing