ABS AUDI A4 1999 B5 / 1.G Brakes ESP Electrical Testing User Guide

01-313

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

Terminal
64
CAN-bus; (Engine Control Module (ECM); Transmission
Control Module (TCM),
steering angle sensor -G85-)
EWD
2
65
not occupied; (control module 4B0 907 389)
-
65
CAN-bus shielding; (control module 8D0 907 389/A/D/E)
-
66
CAN-bus; (Engine Control Module (ECM); Transmission
Control Module (TCM),
steering angle sensor -G85-)
EWD
3
67
Sender 1 for brake booster -G201-; (GND) (control module
4B0 907 389)
1
67
Sender 1 for brake booster -G201-; voltage supply (control
module 8D0 907 389/A/D/E)
1
68
Sensor for brake pressure -G201-; signal wire
2
69
Sender 1 for brake booster -G201-; voltage supply (control
module 4B0 907 389)
3
69
Sender 1 for brake booster -G201-; (GND) (control module
8D0 907 389/A/D/E)
3
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-314

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

Terminal
70
Left-rear wheel speed sensor output; (control module 4B0
907 389)
EWD
70
Instrument cluster; activation of traction control indicator
light (control module 8D0 907 389/A/D/E)
15
71
Speed sensor output rear right
EWD
72
not occupied; (control module 4B0 907 389)
-
72
Front left wheel speed sensor output; (control module 8D0
907 389/A/D/E)
EWD
73
not occupied; (control module 4B0 907 389)
-
73
Front right wheel speed sensor output; (control module 8D0
907 389/A/D/E)
EWD
74
Not assigned
-
75
Sensor for transverse acceleration -G200-; voltage supply;
(control module 4B0 907 389)
3
75
not occupied; (control module 8D0 907 389/A/D/E)
-
76
Parking brake warning light switch -F9-
EWD
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-315

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

Terminal
77
Sender for rotation rate -G202-; test signal; (control module 4B0
907 389)
5
77
Sender for rotation rate -G202-; test signal (combined sensor for
rotation rate and transverse acceleration); (control module 8D0 907
389/A/D/E)
3
78
Sender for rotation rate -G202-; reference signal; (control module
4B0 907 389)
4
78
Sender for rotation rate -G202-; reference signal (combined sensor
for rotation rate and transverse acceleration); (control module 8D0
907 389/A/D/E)
5
79
Sender for rotation rate -G202-; signal wire; (control module 4B0
907 389)
3
79
Sender for rotation rate -G202-; signal wire (combined sensor for
rotation rate and transverse acceleration); (control module 8D0 907
389/A/D/E)
6
80
Sender for rotation rate -G202-; (GND); (control module 4B0 907
389)
1
80
Sender for rotation rate -G202-; (GND) (combined sensor for
rotation rate and transverse acceleration); (control module 8D0 907
389/A/D/E)
2
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-316

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

Terminal
81
Not assigned
-
82
Not assigned
-
83
Not assigned
-
84
Not assigned
-
85
Not assigned
-
86
not occupied; (control module 4B0 907 389)
-
86
Instrument cluster; standing time signal; (control module
8D0 907 389/A/D/E)
11
87
Not assigned
-
88
Not assigned
-
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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01-317
Notes:
For test table

The socket designations of the VAG1598 test box are identical to the terminal designations of the ABS control module
(w/EDL) -J104- in the wiring diagram. Incorrect test procedures can cause damage to the system. Do not bridge any
terminals other than those listed in the table.
Electrical Wiring Diagrams, Troubleshooting & Component Locations Specified values refer to readings on the VAG1526 and are not necessarily applicable for other test units.
If the measured values do not match specifications, carry out the corrective actions listed on the right side of the table.
Electrical Wiring Diagrams, Troubleshooting & Component Locations If values are obtained, also check wiring for intermittent loose terminals and short circuit to B+ and Ground (GND). This
applies especially to sporadic malfunctions.
Use the VAG1594 connector test kit for checking continuity (bridges).
If the measured values only differ slightly from the specifications, clean the sockets and harness connectors of the testers
and adapter leads (using contact spray G 000 700 04) and repeat the test. Before replacing actual components, check
wiring and connections once more. This is especially important if the specification for a resistance test is under 10 .
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01-318
Electrical test; steps 1-12

Resistance measurement: Select measurement range on VAG1526 (200 ) Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
1 5 + 3 Left front ABS inlet valve
-N101-, left front ABS
outlet valve -N102-
- An infinitely high resistance indicates
an open circuit. Check for this.
2 55 + 26 Right front ABS inlet
valve -N99-, right front
ABS outlet valve -N100-

9 22
- A resistance less than the specified
value indicates a short circuit between
both lines. Check for this.
3 53 + 25 Inlet valve -N134-, outlet
valve -N136- left-rear
- Check electrical wiring for short
circuit to Ground (GND) or B+.
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01-320

Resistance measurement: Select measurement range on VAG1526 (200 ) Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
6 52 + 54

High pressure switch
valve -1- traction control
-N227-


W
16
- Check electrical wiring for short
circuit to Ground (GND) or B+.


High pressure switch
valve -2- traction control
-N228- Electrical Wiring Diagrams,
Troubleshooting & Component
Locations
- If the electrical wiring is OK,
replace the hydraulic unit.
7
8 + 10
1)
9 + 10 2) Left front ABS wheel speed
sensor -G47-
400
2300
- An infinitely high resistance
indicates an open circuit. Check for
this.
Outlets on ABS control module -J104- differ depending on installed equipment
1) Vehicles with all-wheel-drive
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01-321

Resistance measurement: Select measurement range on VAG1526 (2k or 20 k )





Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
8 15 + 16 Right front ABS
wheel speed
sensor -G45-
- A resistance less than the specified value
indicates a short circuit between both lines.
Check for this.
9 13 + 14 Left rear ABS
wheel speed
sensor -G46-
400
2300
- Check electrical wiring for short circuit to
Ground (GND) or B+.
10 11 + 12 Right rear ABS
wheel speed
sensor -G44- Electrical Wiring Diagrams,
Troubleshooting & Component Locations - If the electrical wiring is OK, replace the
relevant ABS wheel speed sensor.
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01-322

Resistance measurement: Select measurement range on VAG1526 (200 ) Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
11
2 + 37
1)
2 + 36 2) Activation of ABS
solenoid valve relay -
J106-
- An infinitely high resistance indicates
an open circuit.
- A resistance less than the specified
value indicates a short circuit between
both lines.
12 2 + 7 Activation of ABS
return flow pump relay
-J105-
0W
70

Electrical Wiring Diagrams,
Troubleshooting & Component Locations
- Check electrical wiring for short circuit
to Ground (GND) or B+. - If the electrical wiring is OK, replace
the relay.
Outlets on ABS control module -J104- differ depending on installed equipment
1) Vehicles with control module 4B0 907 389 2) Vehicles with control module 8D0 907 389/A/D/E
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01-323
Electrical test; steps 13-27

Function test
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
13
1)
Bridge
1 + 2,
28+37
2)
28+36 3) Inlet valve -N101
and front left
brake line
connection
Ignition on

- for vehicles with
automatic transmission,
engage neutral position
"N"
- Bridge terminals 5 +
28
- Depress brake pedal
and hold.
Left front
wheel can
be rotated
by hand - If the wheel does not rotate, check the
other wheels for free rotation. If yes, then
hydraulic brake lines are mixed-up
(switched). Check brake line connections
and coupling pieces. Make sure every
component is OK.

See continuation on next page
Outlets on ABS control module -J104- differ depending on installed equipment
1) This test step requires two technicians.
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