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Radio system
General information
CAUTION!
Before beginning repairs on the electrical
system:
Obtain anti-theft radio security code if
necessary.
Switch the ignition off.
Disconnect battery Ground (GND) strap.
On vehicles equipped with Audi Telematics
by OnStar , switch-off the emergency (back-
up) battery for the Telematic/Telephone
Control Module prior to disconnecting
vehicle battery. Use VAS 5051 Vehicle
Diagnostic, Testing and Information System
in mode "Guided Fault Finding" Page 91
-
119
.
After reconnecting vehicle battery, re-code
anti-theft radio if necessary and check
operation. Also check operation of clock and
power windows according to Repair Manual
Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication
Page 2 of 82
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After reconnecting vehicle battery on
vehicles equipped with Audi Telematics by
OnStar , switch-on the emergency (back-
up) battery for the Telematic/Telephone
Control Module. Use VAS 5051 Vehicle
Diagnostic, Testing and Information System
in mode "Guided Fault Finding" Page 91
-
119
.
Note:
Further measures after reconnecting the voltage
supply:
Repair Manual, Fuel Injection & Ignition,
Repair Group 24 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
Page 53 of 82
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- Pull radio out from instrument panel.
- Disconnect electrical connections and antenna
wire.
- Pull out release tool from the radio - to do this,
press in locking tabs on radio.
Installing
- Reconnect electrical connections and antenna
wire.
- Carefully insert radio into instrument panel and
engage in installation slot.
- Code radio if replacement unit is installed. Use
VAS 5051 Vehicle Diagnostic, Testing and
Information System in mode "Guided Fault
Finding". Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication
Page 55 of 82
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- Pull radio out from instrument panel.
- Disconnect electrical connections and antenna
wire.
- Pull out release tool from the radio - to do this,
press in the locking tabs at top and bottom on
radio.
Installing
- Reconnect electrical connections and antenna
wire.
- Carefully insert radio into instrument panel and
let it engage in installation slot.
- Code radio if replacement unit is installed. Use
VAS 5051 Vehicle Diagnostic, Testing and
Information System in mode "Guided Fault
Finding". Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication
