1998 AUDI A4 Amplifier

91-3

Retrofitting radio systems

The connectors on the factory-installed radio
wiring harness are designed for genuine Audi
radios.
Radios with different types of connectors must
be installed using adapter wires.

CAUTION!

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).
Vehicle malfunctions may also occur if the
vehicle speed sensor signal wire is connected
to radios supplied by other manufacturers.
If a non-stock radio is installed ("Concert" m.y.
1998 ) it can have a negative effect on the
antenna amplifier. The original Audi radio units
supply power to the antenna amplifier through
the center wire of the HF cable.

Retrofitting CD systems
The wiring for the CD changer is installed in the
Pa
ge 4 of 45 Radio s
ystems
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE02.91.1

91-4

Radio system, overview ( m.y. 1997)


"Delta" radio system
Multi-pin connectors I, II, III (on back of radio), terminal assignments
Note:
Terminals which are not listed are vacant/unassigned. 1 - Rear window antenna with antenna amplifier
2 - Bass speaker in front door trim (bottom)
3 - Mid-range/treble speaker in front door trim (top)
4 - Broad-band speaker (active with double amplifier) in parcel shelf (left-
rear)
5 - Broad band speaker (passive) in parcel shelf (right-rear)
6 - CD changer (optional) in luggage compartment (left-rear)

20-pin connector I
1 - Line out, left-rear
2 - Line out, right-rear
3 - Low frequency Ground (GND)
Pa
ge 6 of 45 Radio s
ystems
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE02.91.1

91-6


8-pin connector III (black)
1 - Vehicle speed sensor (Gala)
2 - Low frequency mute switch (telephone system)
3 - Terminal 30
4 - Terminal 86s connection for ignition key switched on and off (S-
contact)
5 - Switched positive supply (B+) for antenna amplifier
6 - Illumination (terminal 58d)
7 - Terminal 30
8 - Ground (GND) (terminal 31)
Pa
ge 8 of 45 Radio s
ystems
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE02.91.1

91-7

"Delta" radio with BOSE sound system

Multi-pin connectors I, II, III (on back of radio) terminal assignments
Note:
Terminals which are not listed are vacant/unassigned. 1 - Rear window antenna with antenna amplifier
2 - BOSE amplifier in luggage compartment (left-rear)
3 - Bass speaker in front door trim (bottom)
4 - Mid-range/treble speaker in front door trim (top)
5 - Broad band speaker in rear door trim
6 - Bass speaker in parcel shelf
7 - CD changer (optional) in luggage compartment (left-rear)

20-pin connector I
1 - Line out, left-rear
2 - Line out, right-rear
3 - Low frequency Ground (GND)
Pa
ge 9 of 45 Radio s
ystems
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE02.91.1

91-8


4 - Line out, left-front
5 - Line out, right-front
6 - Switched positive supply (B+) for BOSE amplifier
7 - BOSE coding
8 - Clock signal
9 - Data signal
10 - Enable signal
12 - USA coding
13 - CD bus data (CD changer)
14 - CD bus clock (CD changer)
15 - Ground (GND) (CD changer)
16 - Positive supply (B+) (continuous)
17 - Switched positive supply (B+) for CD changer
18 - Low frequency Ground (GND) for CD changer
19 - Signal wire for left channel (CD low frequency-L)
20 - Signal wire for right channel (CD low frequency-R)
Pa
ge 10 of 45 Radio s
ystems
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE02.91.1

91-9


8-pin connector III (black)
1 - Vehicle speed sensor (Gala)
2 - Low frequency mute switch (telephone system)
3 - Terminal 30
4 - Terminal 86s connection for ignition key switched on and off (S-
contact)
5 - Switched positive supply (B+) for antenna amplifier
6 - Illumination (terminal 58d)
7 - Terminal 30
8 - Ground (GND) (terminal 31)
Pa
ge 11 of 45 Radio s
ystems
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE02.91.1

91-10

Radio system, overview (m.y. 1998 )


"Concert" radio (sedan)

"Concert" radio (Avant) 1 - Rear window antenna with antenna amplifier
2 - Bass speaker in front door trim (bottom)
3 - Mid-range/treble speaker in front door trim (top)
4 - Broad band speaker (active with double amplifier) in parcel shelf (left-
rear)
5 - Broad band speaker (passive) in parcel shelf (right-rear)
6 - CD changer (optional) in luggage compartment (left-rear)

1 - Roof antenna with antenna amplifier
2 - Bass speaker in front door trim (bottom)
3 - Mid-range/treble speaker in front door trim (top)
4 - Broad band speaker (2-way) in rear door trim
5 - Bass speaker (subwoofer) in left-rear of cargo area under side trim
6 - CD changer (optional) in left-rear of cargo area under storage
compartment
Pa
ge 12 of 45 Radio s
ystems
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE02.91.1

91-14

"Concert" radio with BOSE sound system
(sedan)

"Concert" radio with BOSE sound system (Avant) 1 - Rear window antenna with antenna amplifier
2 - Telephone speaker
3 - BOSE amplifier in luggage compartment (left-rear)
4 - Bass speaker in front door trim (bottom)
5 - Mid-range/treble speaker in front door trim (top)
6 - Broad band speaker in rear door trim
7 - Bass speaker in parcel shelf
8 - CD changer (optional) in luggage compartment (left-rear)

1 - Roof antenna with antenna amplifier
2 - Telephone speaker
3 - BOSE amplifier combined with bass speaker (subwoofer) in cargo
area (left-rear) under side trim
4 - Bass speaker in front door trim (bottom)
5 - Mid-range/treble speaker in front door trim (top)
6 - Broad band speaker in rear door trim
7 - CD changer (optional) in cargo area (left-rear) under storage
compartment
Pa
ge 16 of 45 Radio s
ystems
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE02.91.1