2005-2008 AUDI A4 Service and Repair Manual
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with respect to the correctness of information in this document. Copyright by AUDI AG.
Basic Equipment Lowline
From 2003 m. y.
Main fuse
A97--0220
♦ on the Battery
Fuse holder
A97--0242
23 22 21 20
19 18 17 16
15 14 13 12
11 10 9 8
7 6 5
3 4
1 2
44 43 42 41 40
37
39 38
36 35 34 33 32 31
30 29 28 27 26 25 24
Res
Res
Res
Res
Res
Audi A4
Wiring Diagram
No. 3 / 1
12.2005
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ Instrument panel driver side
Fuse Colors
30 A - Green
25 A - Withe
20 A - Yellow
15 A - Blue
10 A - Red
7,5 A - Brown
5 A - Beige
Note:
♦ Fuse in fusebox from 23 onwards are numbered 223 onwards in Current Flow Diagram.
Coupling station with threaded connection
A97--0248
5 6 7
1 2 3 4
♦ in the electronics box, plenum chamber
1 - 10-Pin Connector, black (T10)
2 - 10-Pin Connector, brown (T10a)
3 - 17-Pin Connector, red (T17d)
6 - 17-Pin Connector, white (T17e)
Audi A4
Wiring Diagram
No. 3 / 1
12.2005
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Connector station A-pillar
A97--0247
8
11 12 13 14
2 3
4 5 6 7
10 9
16 15 17
A B
1
♦ behind side trim, left
13 - 10-Pin Connector, violet (T10c)
14 - 10-Pin Connector, grey (T10d)
15 - 17-Pin Connector, green (T17b)
16 - 17-Pin Connector, red (T17a)
17 - 17-Pin Connector, black (T17)
Audi A4
Wiring Diagram
No. 3 / 1
12.2005
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Connector station A-pillar
A97--0400
8
11 12 13 14
2 3
4 5 6 7
10 9
16 15 17
A B
1
C E
D F
♦ behind side trim, right
15 - 17-Pin Connector, red (T17c)
4-Pin Relay Carrier with threaded connection
A97--0245
1 2
3
4
C
B
G
E
F
A
D
H
♦ Instrument panel driver side
Audi A4
Wiring Diagram
No. 3 / 1
12.2005
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
9-Pin Relay Carrier with Vehicle Electrical System Control Module
A97--0399
8 9 7
A
1
B
2 3 4 5 6
C D E F G
♦ Instrument panel driver side, behind 3-Pin Relay Carrier
3 - Horn Relay (J4)
6 - Load Reduction Relay (J59)
Audi A4
Wiring Diagram
No. 3 / 1
12.2005
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
1 2 3 4 5 6 7 8 9 10 11 12 13 14
97--58978
3
35,0
sw
179 345
T4k/4
2,5
br
2,5
br
83 12
4,0
br
26 179
6,0
br
86 50
6,0
br
78 249
6,0
br
249 78
2,5
br
ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = lilac
ge = yellow
or = orange
rs = pink
Ground connections
T4k 4-Pin Connector, black, near front bumper
3 Ground strap, engine to body
12 Ground connection, in engine compartment, left
26 Ground connection, on front apron
50 Ground connection, in luggage compartment, left
78 Ground Connection (lower right B-pillar)
83 Ground connection -1-, in right front wiring harness
86 Ground connection -1-, in rear wiring harness
179 Ground connection, in left headlight wiring harness
249 Ground connection -2-, in wiring harness interior
345 Ground connection (in bumper wiring harness), Fanfare/Fog light
Audi A4
Wiring Diagram
No. 3 / 2
12.2005
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
15 16 17 18 19 20 21 22 23 24 25 26 27 28
32
6,0
br
44 81
6,0
br
49 238
6,0
br
33 135
6,0
br
33 261 135
T10c
/1
1,5
br
43 176
97--58975
277
6,0
br
77
2,5
br
2,5
br
ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = lilac
ge = yellow
or = orange
rs = pink
Ground connections
T10c 10-Pin Connector, violet, connector station A-pillar, left
32 Ground connection, behind instrument panel, left
33 Ground connection, behind instrument panel, right
43 Ground connection (lower right A-pillar)
44 Ground connection (lower left A-pillar)
49 Ground connection, near Central control module for comfort system
77 Ground Connection (lower left B-pillar)
81 Ground connection -1-, in instrument panel wiring harness
135 Ground connection -2-, in instrument panel wiring harness
176 Ground connection, in right headlight wiring harness
238 Ground connection -1-, in wiring harness interior
261 Ground connection, in wiring harness heated spray jet
277 Ground connector -3-, in wiring harness interior
Audi A4
Wiring Diagram
No. 3 / 3
12.2005
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
29 30 31 32 33 34 35 36 37 38 39 40 41 42
97--57338
2/75 4/P 8/86s
D
3/30 7/30
0,5
ro
0,35
gr/ge
2,5
ro
1/50
2,5
ro
6/15
4,0
sw
01 0123
6,0
ro
2,5
ro
2,5
ro
0,35
bl
0,5
ge/sw
1,0
ge/sw
A32
A21
A33
a
c
d
e
11
--
A
+
35,0
br
501
b
235
0,22
ro
218
B
5/50b
2,5
ro/sw
2,5
sw
T10a/4
2,5
ro/sw
6,0
ro
6,0
ro
6,0
ro
222 162 193
81 82
213
1,0
ge/sw
A2
241
4,0
sw
155
0,22
ge/sw
S 88
150A
16,0
ro
500
0,35
sw
6,0
ro
162 193 222
81 82
155 213 218 241
235
ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = lilac
ge = yellow
or = orange
rs = pink
Ignition/Starter Switch, main fuse
A Battery
B Starter
D Ignition/Starter Switch
S88 Fuse Strip (main fuse)
T10a 10-Pin Connector, brown, connector station E-box, plenum
chamber
11 Ground connection, in battery box
500 Threaded connection -1- (30), on the relay plate
501 Threaded connection -2- (30), on the relay plate
A2 Plus connection (15), in instrument panel wiring harness
A21 Wire connection (86s), in instrument panel wiring harness
A32 Plus connection (30), in instrument panel wiring harness
A33 Wire connection (75), in instrument panel wiring harness
* Heated spray jet only
** see applicable engine wiring diagram
Audi A4
Wiring Diagram
No. 3 / 4
12.2005
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
43 44 45 46 47 48 49 50 51 52 53 54
97--53355
55 56
E 45
1,0
br
1,0
ro/ge
A21
T16a/15
0,35
gr/ge
0,35
bl
0,5
ge/sw
T16a/12 T16a/16 T16a/1
T16a/2
0,22
ro
T16a/14
A2
0,5
sw
T16a/13
J 527
135
0,22
bl/gn
T16a/5
J...
T17e/10
0,35
bl/gn
170
a
c
d
e
b
170
ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = lilac
ge = yellow
or = orange
rs = pink
Steering Column Electronic Systems Control Module, Cruise
Control Switch
E45 Cruise Control Switch
J... Engine Control Module (ECM)
J527 Steering Column Electronic Systems Control Module
T16a 16-Pin Connector, black, on steering Column Electronic Systems
Control Module
T17e 17-Pin Connector, white, connector station E-box, plenum chamber
135 Ground connection -2-, in instrument panel wiring harness
A2 Plus connection (15), in instrument panel wiring harness
A21 Wire connection (86s), in instrument panel wiring harness
Audi A4
Wiring Diagram
No. 3 / 5
12.2005
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
57 58 59 60 61 62 63 64 65 66 67 68
97--52790
69 70
E 2 E 22
G85 H
J 527
ws = white
sw = black
ro = red
br = brown
gn = green
bl = blue
gr = grey
li = lilac
ge = yellow
or = orange
rs = pink
Turn signal switch, Windshield Wiper/Washer Switch,
Steering Angle Sensor, Signal horn activation, Steering
Column Electronic Systems Control Module
E2 Turn signal switch
E22 Windshield Wiper/Washer Switch
G85 Steering Angle Sensor
H Signal horn activation
J527 Steering Column Electronic Systems Control Module
Audi A4
Wiring Diagram
No. 3 / 6
12.2005
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What's Included?
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$37.99
The 2005-2008 AUDI A4 Service and Repair Manual is a comprehensive guide for maintaining and fixing your Audi A4 during the years 2005 to 2008. This manual includes detailed step-by-step instructions, diagrams, illustrations, and specifications to help you perform various services and repairs on your Audi A4.
- Provides information on routine maintenance tasks such as oil changes, filter replacements, and tire rotations.
- Includes instructions for troubleshooting and diagnosing common problems.
- Covers engine repairs, including timing belt replacement, cylinder head removal, and turbocharger installation.
- Discusses electrical system repairs, including wiring diagrams and component locations.
- Addresses suspension and steering repairs, such as shock absorber replacement and power steering pump repair.
- Offers guidance on brake system repairs, including brake pad replacement and ABS troubleshooting.
With the 2005-2008 AUDI A4 Service and Repair Manual, you'll have all the information you need to keep your Audi A4 in top condition. Whether you're a DIY enthusiast or a professional mechanic, this manual is a valuable resource for maintaining and repairing your vehicle.
