1998 AUDI A4 Amplifier

91-15

Multi-pin connectors I, II, III, IV (on back of
radio), terminal assignments

Note:
Terminals which are not listed are
vacant/unassigned.

20-pin connector I
1 - Line out, left-rear
2 - Line out, right-rear
3 - Low frequency Ground (GND)
4 - Line out, left-front
5 - Line out, right-front
6 - Switched positive supply (B+) for BOSE amplifier
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91-18


Radio system, overview (sedan)

1 -
Radio
In center consoleRemoving and installing page 91
-23
2 -
BOSE amplifier
In luggage compartment (left-rear) under
parcel shelf Removing and installing page 91
-35
3 -
Antenna amplifier
In left D-pillar trimRemoving and installing page 91
-39
4 -
Rear window antenna
Upper 3 wires are AM antenna (non-
heated) Remaining wires are FM antenna (heated)Removing and installing Repair Manual, Body Exterior, Repair Group 64
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91-21


Radio system, overview (Avant)

1 -
Radio
In center consoleRemoving and installing page 91
-23
2 -
Bass speaker
In front door trim (bottom)Removing and installing page 91
-27
3 -
Mid-range/treble speaker
In front door trim (top)Removing and installing page 91
-28
4 -
Broad band speaker
In rear door trimRemoving and installing page 91
-30
5 -
Antenna base
With integrated amplifier
6 -
Roof antenna With radio and telephone system,
combination antenna is used Removing and installing page 91
-40
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91-22


7 -
CD changer
In luggage compartment (left-rear) under
cargo area storage bin Removing and installing page 91
-32
Checking cable between radio and CD
changer page 91
-34

8 -
BOSE amplifier combined with bass
speaker (subwoofer) only with "Concert
with BOSE sound system"
In cargo area (left-rear) under side trimRemoving and installing page 91
-37
9 -
Bass speaker (subwoofer) only with
"Concert" radio
In cargo area (left-rear) under side trimRemoving and installing page 91
-37
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91-32


CD changer, removing and installing
(Avant)

Overview
1 -
Bass speaker (subwoofer)
2 -
CD changer
3 -
Telephone sending/receiving unit (not
applicable for USA/Canada)
4 -
Phillips-head screws (3x) For mounting frame for CD/telephone
5 -
Mounting screws for bass speaker
(subwoofer)
6 -
Frame for CD changer/telephone
7 -
Harness connector for BOSE amplifier
8 -
Harness connector for bass speaker
(subwoofer)
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91-35

BOSE amplifier, removing and installing
(sedan)


Note:
In vehicles from VIN 200000, the Bose amplifier
is mounted in the same area as shown below,
but in a vertical orientation.

Removing
The BOSE amplifier is located in the luggage
compartment on the left side over the wheel
housing.

Installing - Remove Phillips-head screws -3- (1x) and -4- (2x) and remove frame
for BOSE amplifier -1-.
- Disconnect harness connector on back of amplifier.
- Install in reverse order of removal.
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91-36

BOSE amplifier with bass speaker
(subwoofer), removing and installing
(Avant)

The BOSE amplifier is located in the left side of
the cargo area under the cargo area side trim.

Notes:

If the vehicle is equipped with a CD changer, it
must be removed page 91
-32
.

Bass speaker (subwoofer), removing and
installing page 91
-37
.
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91-39

Antenna amplifier, removing and
installing (sedan)


Removing

Installing - Remove D-pillar trim Repair Manual, Body Interior, Repair Group
70
.
- Disconnect antenna wire and disconnect all harness connectors.
- Remove hex screws and remove antenna amplifier.
- Install in reverse order of removal.
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