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

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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01-319

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






4 6 + 4 Inlet valve -N133-,
outlet valve -N135-
right-rear

9 22
Electrical Wiring Diagrams,
Troubleshooting & Component Locations - If the electrical wiring is OK, replace the
hydraulic unit.
5 49 + 50

Pilot valve -1-
traction control -
N225-
- An infinitely high resistance indicates an
open circuit. Check for this.

Pilot valve -2-
traction control -
N226-
12
28
- A resistance less than the specified
value indicates a short circuit between
both lines. Check for this.
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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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01-333
Continuation: Function test: ABS warning light -K47-
Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
17 - Function of
ABS warning
light -K47-
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Repair Manual, Electrical Equipment, Repair Group
90; Instrument cluster
- The ABS warning lamp does not switch off after 2
seconds. The red "brake system malfunction" symbol
lights up after 2 seconds. Check wire from terminal 32
of ABS control module -J104- to instrument cluster for
short circuit to B+ or open circuit.
- If voltage of electrical system is OK and wiring from
terminal 32 of ABS control module -J104- to instrument
cluster is intact there is a malfunction in instrument
cluster.
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01-337
Continuation: Function test: Traction control indicator light -K86-
Test step
VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified value
Corrective action
19

Continuation: - Function of
traction
control
indicator light
-K86- - Switch on
ignition Traction control
indicator light -K86-
comes on for two
(2) seconds and
then goes out.
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - If traction control indicator light does
not light up, check vehicle voltage and
wire from terminal 31 of ABS control
module -J104- to instrument cluster for
short circuit to B+ and open circuit.
- If traction control indicator lights
continuously, test wiring from terminal
31 of ABS control module -J104- to
instrument cluster for short circuit to
Ground (GND).

See continuation on next page
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01-341
Continuation: Function test: Traction control button; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work
steps Specified
value Corrective action
20 28 + 44 Function of
ASR/ESP button Ignition switched
on.

- ASR/ESP button not
pressed 0.0 to 1.0 V
Electrical Wiring Diagrams,
Troubleshooting & Component Locations
- Check wire from terminal 28 to Ground
(GND).
- Check wiring from terminal 44 to
traction control button, terminal 6.
- Check voltage supply from terminal 5
of ASR/ESP button to terminal 15.

See continuation on next page
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