ABS AUDI A4 1999 B5 / 1.G Brakes ESP Electrical Testing Workshop Manual

01-302

Test requirements

The "Automatic Test Sequence" was carried
out and it was determined that the
Transmission Control Module (TCM) and
Engine Control Module (ECM) only contain
DTCs relating to ABS.

- Connect the VAG1551 Scan Tool (ST) and
select the address word 00 with ignition
switched on;

- After completing electrical test, check and
erase DTC memories of Transmission Control
Module (TCM) and Engine Control Module
(ECM).

Multi-pin harness connector for ABS control module -J104- in proper
condition, with no bent, broken or corroded terminals. Replace any
damaged terminals using VAS1978 wiring repair kit.
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01-303

Note:
The operation manual for the VAS1978 wiring
harness repair kit generally forbids the repair of
any lines in the ABS or related systems. This rule
only pertains to the shielded lines in these
systems.

Ignition and electrical consumers switched
off before beginning testing (headlights,
lighting, fan, etc.).
For steps 13 through 16, raise the vehicle
until the wheels rotate freely. On vehicles
with manual transmission put the gear shift
lever in neutral. On vehicles with automatic
transmission move the selector lever to
position "N".
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01-305

Connecting VAG1598/20 test box and
checking ESP system

- Switch ignition off.

- Remove ABS control module -J104-.

Repair manual, Brake System, Repair Group
45


- Disconnect multi-pin connector from ABS control
module -J104-.

- Check multi-pin connector between harness
connector and ABS control module -J104-.

The socket designations on the VAG1598/20 test box are identical to the
terminal designations on the ABS control module -J104- and on the wiring
harness connector.
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Connect VAG1598/20 test box to multi-pin connector of wiring harness.
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01-306
Terminal allocation, ABS control module -J104- Multi-pin connector at ABS control module
(w/EDL) -J104- Terminal
Connected to...

Terminal
1

Voltage supply, terminal 15
Traction control switch
-
5
2
ABS return flow pump relay -J105- (B+)
ABS solenoid valve relay -J106- (B+)
Voltage supply for steering angle sensor -G85- via
terminal 15
86
86
5
3
Hydraulic unit; activation of left front ABS outlet
valve -N102-
15
4
Hydraulic unit; activation of right rear ABS outlet
valve -N135-
12
5
Hydraulic unit; activation of left front ABS inlet
valve -N101-
8
6
Hydraulic unit; activation of right rear ABS inlet
valve -N133-
2
7
ABS return flow pump relay -J105- (GND)
85
8
Left front ABS wheel speed sensor -G47-
For vehicles with all-wheel-drive:
-
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01-307

Multi-pin connector at ABS control module (w/EDL) -
J104- Terminal
Connected to...

Terminal
9
Left front ABS wheel speed sensor -G47-
For vehicles with front-wheel-drive:
-
10
Left front ABS wheel speed sensor -G47-
(GND)
-
11
Right rear ABS wheel speed sensor -G44-
-
12
Right rear ABS wheel speed sensor -G44-
(GND)
-
13
Left rear ABS wheel speed sensor -G46-

14
Left rear ABS wheel speed sensor -G46- (GND)
-
15
Right front ABS wheel speed sensor -G45-
-
16
Right front ABS wheel speed sensor -G45-
(GND)
-
17
Not assigned
-
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-308

Multi-pin connector at ABS control
module (w/EDL) -J104- Terminal
Connected to...

Terminal
18
Sensor for transverse acceleration -G200-; signal wire (control
module 4B0 907 389)
2
18
Sensor for transverse acceleration -G200-; signal wire (combined
sensor for rotation rate and transverse acceleration) (control
module 8D0 907 389/A/D/E)
4
19
Sensor for transverse acceleration -G200-; (Ground -GND-) (control
module 4B0 907 389)
1
19
not occupied; (control module 8D0 907 389/A/D/E)
-
19
not occupied; (control module 8D0 907 389A)
-
20
ABS return flow pump relay -J105-
Hydraulic unit; control wire for ABS return flow pump -V39-
87
14
21
Not assigned
-
22
Hydraulic pump for traction control -V156-; voltage supply
2
23
Not assigned
-
24
Hydraulic pump for traction control -V156-; (GND)
1
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-309

Multi-pin connector at ABS control module
(w/EDL) -J104- Terminal
Connected to...

Terminal
25
Hydraulic unit; activation of left rear ABS outlet valve -
N136-
11
26
Hydraulic unit; activation of right front ABS inlet valve -N99-

5
27
Not assigned
-
28
Ground (GND) supply, terminal 31
-
29
Ground (GND) supply, terminal 31
-
30
Not assigned
-
31
Instrument cluster; activation of traction control indicator
light; (control module 4B0 907 389)
15
31
Rear left wheel speed sensor output; (control module 8D0
907 389/A/D/E)
-
32
Instrument cluster; ABS/EDL warning light activation
26
33
Not assigned
-
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-310

Multi-pin connector at ABS control
module (w/EDL) -J104- Terminal
Connected to...

Terminal
34
Sender for rotation rate -G202-; voltage supply; (control module
4B0 907 389)
2
34
Sender for rotation rate -G202-; voltage supply (combined sensor
for rotation rate and transverse acceleration) (control module 8D0
907 389/A/D/E)
1
35
Not assigned
-
36
not occupied; (control module 4B0 907 389)
-
36
ABS solenoid valve relay -J106- (GND); (control module 8D0 907
389/A/D/E)
85
37
ABS solenoid valve relay -J106- (GND); (control module 4B0 907
389/A/D/E)
85
37
not occupied; (control module 8D0 907 389/A/D/E)
-
38
Not assigned
-
39
Not assigned
-
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-311

Multi-pin connector at ABS control module
(w/EDL) -J104- Terminal
Connected to...

Terminal
40
Not assigned
-
41
Not assigned
-
42
Brake light switch -F; brake test switch
4
43
Not assigned
-
44
Traction control switch
6
45
Not assigned
-
46
Diagnostic connector; K-wire
7
47
Not assigned
-
48
Brake light switch -F-; brake light switch
2
49
ABS hydraulic unit -N55-; activation of pilot valve -1-
traction control -N225-
7
50
ABS hydraulic unit -N55-; activation of pilot valve -2-
traction control -N226-
6
51
Voltage supply; terminal 30 for hydraulic pump for
traction control -V156-;
-
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-312

Multi-pin connector at ABS control module
(w/EDL) -J104- Terminal
Connected to...

Terminal
52
ABS hydraulic unit -N55-; activation of high pressure
switch valve -2- traction control -N228-
4
53
ABS hydraulic unit -N55-; activation of left rear ABS inlet
valve -N134-
3
54
ABS hydraulic unit -N55-; activation of high pressure
switch valve -1- traction control -N227-
1
55
ABS hydraulic unit -N55-; activation of right front ABS
outlet valve -N100-
9
56
not used
-
57
not used
-
58
not used
-
59
not used
-
60
not used
-
61
Not assigned
-
62
Not assigned
-
63
Not assigned
-
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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