wiring AUDI A4 1998 B5 / 1.G Brakes ESP Electrical Testing Owner's Manual

01-332
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- - Switch on
ignition ABS warning light -
K47- lights up for two
(2) seconds and then
goes out. - If ABS warning light does not come on,
check voltage of electrical system and test
wiring from terminal 32 of ABS control
module -J104- to instrument cluster for short
circuit to Ground (GND).

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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).

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01-338
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 - Function of
traction control
indicator light -
K86-
Repair Manual, Electrical Equipment, Repair
Group 90; Instrument cluster
- Are voltage of electrical system OK and wiring
from terminal 31 of ABS control module -J104-
to instrument cluster intact? malfunction in
instrument cluster
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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.

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01-342
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
- ASR/ESP button
pressed 10.0 to 14.5
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.
- If no malfunctions can be found using the
procedures in these steps, replace the
ASR/ESP button.
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01-343

Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
21 1 + 28
1 + 29 Voltage supply to ABS
control module -J104- via
terminal 15 Ignition
switched on. 10.5 to 14.5
V
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Check wiring from terminals 28
and 29 to Ground (GND).
- Check wiring from terminal 1 to
terminal 15 via fuse (10A).
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01-344

Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
22 - Voltage supply of
solenoid valves via
ABS solenoid valve
relay -J106-.
Repair Manual, Brake System,
Repair Group 45
- Remove ABS solenoid valve relay -
J106-.


- Check voltage supply for ABS
solenoid valve relay -J106- at terminal
30 for open circuit or short circuit to
B+ or Ground (GND). 10.5 to
14.5 V
Electrical Wiring
Diagrams, Troubleshooting
& Component Locations - Check the relevant fuse,
25A, and repair the wiring
problem.

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01-345
Continuation: Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
22 - Voltage supply of
solenoid valves
via ABS solenoid
valve relay -J106-
.
- Check wiring from ABS solenoid valve
relay -J106- (terminal 87) to ABS
hydraulic unit -N55- (terminal 10) for
open circuit or short circuit to B+ or
Ground (GND).
- Fix the wiring problem.
- If the power supply lines
are OK, replace the relay.
- If the original malfunction
"ABS solenoid valve relay -
J106-" is still not fixed,
replace the ABS hydraulic
unit.
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01-346

Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
23 - Voltage supply for
ABS return flow
pump relay -J105-
via terminal 30
Repair Manual, Brake System,
Repair Group 45
- Remove ABS return flow pump relay
-J105-.


- Check voltage supply for ABS return
flow pump relay -J105- at terminal 30
for open circuit or short circuit to
Ground (GND). 10.5 to
14.5 V
Electrical Wiring
Diagrams, Troubleshooting
& Component Locations - Check the relevant fuse,
60A, and repair wire
damage.
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