wiring AUDI A4 2002 B5 / 1.G Radio System General Information

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Before troubleshooting or servicing, technicians
must be familiar with the functions and operation
specifics of the applicable standard or optional
radio system. Always read the radio owner's
manual and review all radio, tape player and CD
player/changer functions.

Notes:

When retrofitting, repairing or
troubleshooting:
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Radio installation instructions
For detailed instructions (e.g. removing and
installing trim panels):
Repair Manual, Body Interior, Repair Group
70


Wherever possible, only genuine Audi parts
should be used. Only then can trouble-free
installation and optimal reception be
guaranteed.
All radio systems have anti-theft coding.
Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication

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On Board Diagnostic (OBD)
Radio systems have extensive On Board
Diagnostic (OBD) capabilities.
The radio unit has a Diagnostic Trouble Code
(DTC) memory. If a malfunction occurs in one of
the components or wires which is monitored by
the system, a record of the type of malfunction is
stored in DTC memory. Use VAS 5051 Vehicle
Diagnostic, Testing and Information System in
mode "Guided Fault Finding".

Retrofitting of radio systems

The electrical connections on the factory-
installed radio wiring harness are designed for
genuine Audi radios.
Radios with different types of electrical
connections must be installed using adapter
wires.
When connecting the vehicle speed sensor
signal wire (on radios with the GALA function),
take particular care to avoid short circuits,
which could result in vehicle malfunctions (e.g.
in the engine management system).

Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication

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CD equipment, retrofitting
The wiring set for the CD changer unit is in the
vehicle during production. The connecting cable
can only be used with original Audi CD
changers. Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication

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"Concert II" and "Symphony II" radio
systems (Sedan), component overview

1 -
CD Changer Unit -R41-
OptionalIn glove compartmentRemoving and installing Page 91
-48
Check wiring Page 91
-50
2 -
Center Mid/High Range Loudspeaker -
R158-
In instrument panelRemoving and installing Page 91
-59
3 -
Radio -R-
In instrument panel, centerRemoving and installing "Concert II" radio
Page 91
-44

Removing and installing "Symphony II"
radio Page 91
-46

Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication

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"Concert II" and "Symphony II" radio
systems (Avant), component overview

1 -
CD Changer Unit -R41-
OptionalIn glove compartmentRemoving and installing Page 91
-48
Check wiring Page 91
-50
2 -
Center Mid/High Range Loudspeaker -
R158-
In instrument panelRemoving and installing Page 91
-59
3 -
Radio -R-
In instrument panel, centerRemoving and installing "Concert II" radio
Page 91
-44

Removing and installing "Symphony II"
radio Page 91
-46

Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication

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Radio systems with Satellite Digital Audio
Radio Service (SDARS) (Sedan),
component overview

1 -
CD Changer Unit -R41-
OptionalIn glove compartmentRemoving and installing Page 91
-48
Check wiring Page 91
-50
2 -
Center Mid/High Range Loudspeaker -
R158-
In instrument panelRemoving and installing Page 91
-59
3 -
Radio -R-
In instrument panel, centerRadio "Concert II" Removing and installing
Page 91
-44

Radio "Symphony II" Removing and
installing Page 91
-46

Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication

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Radio systems with Satellite Digital Audio
Radio Service (SDARS) (Avant),
component overview

1 -
CD Changer Unit -R41-
OptionalIn glove compartmentRemoving and installing Page 91
-48
Check wiring Page 91
-50
2 -
Center Mid/High Range Loudspeaker -R-
158
In instrument panelRemoving and installing Page 91
-59
3 -
Radio -R-
In instrument panel, centerRadio "Concert II" Removing and installing
Page 91
-44

Radio "Symphony II" Removing and
installing Page 91
-46

Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication

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- Pull CD changer out of installation slot.

- Disconnect electrical connection.

- Pull out release tool from CD changer - to do
this, press in locking tabs on CD changer.

Installing

- Reconnect electrical connection.

- Slide CD changer into installation slot until it
engages.

- After installation, it is essential that the wiring is
checked Page 91
-50
.
Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication

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Checking wiring between radio and CD
changer

- Switch off radio.

"Concert II" radio:

- Press CD button on radio and switch radio on at
the same time.

"Symphony II" radio:

- Press button "4" on radio and switch radio on at
the same time, keeping the ON button pressed
in.

All models:

1. Wiring OK
Indicated on radio display:
"CONNECT" Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication

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2. Wiring not OK
Indicated on radio display:
"NO CDC"

- Check electrical connections at CD changer.

- Repeat wiring test and, if the wiring is not OK,
use wiring diagrams to check wiring.
Electrical Wiring Diagrams Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication