1995 AUDI A4 wiring diagram

01-93

Function test: Traction control indicator light -K86-. This is only installed if vehicle is equipped with ASR.
Test step
VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified value
Corrective action
21

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 lamp
remains continuously lit, check wire
from terminal 31 of ABS control
module -J104- to instrument cluster for
short circuit to Ground (GND).

Repair Manual, Electrical
Equipment, Repair Group 90; Instrument cluster
- Are both the vehicle voltage and the
wiring from terminal 31 of ABS control
module -J104- to the instrument
cluster OK? Malfunction in
instrument cluster.
Pa
ge 48 of 79 Read Measurin
g Value Block
(function 08
)
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pair&id=AUDI.B5.SU02.01.8

01-95

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
22 28 + 44 Function of
traction control
button Ignition switched
on.
Continuation:
- Traction control
button not pressed 0.0 to 0.5
V

- Traction control
button pressed 10.0 to 14.5
V
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Check wire from terminal 28 to
Ground (GND).
- Check wire from terminal 44 to
traction control button, terminal 6.
- Check voltage supply from terminal 5
of traction control button to terminal 15.
- If no malfunctions can be found using
the procedures in these steps, replace
the traction control button.
Pa
ge 50 of 79 Read Measurin
g Value Block
(function 08
)
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01-96

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
23 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 wire from terminal 1 to
terminal 15.
Pa
ge 51 of 79 Read Measurin
g Value Block
(function 08
)
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-107

Output on
printer of
VAG1551 Scan
Tool (ST) Possible cause
Corrective action
DTC
00301
ABS return flow
pump -V39 -
Open circuit in wire or contact resistance
in Ground (GND) connection or voltage
supply to ABS return flow pump -V39-.
Open circuit or short circuit to B+ or
Ground (GND) in wiring between ABS
return flow pump relay -J105- and the
ABS control module -J104-.
ABS return flow pump relay -J105-, ABS
return flow pump -V39- or hydraulic unit
malfunctioning. Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Electrical Wiring Diagrams, Troubleshooting &
Component Locations - Locate and repair open circuit or contact resistance.
- Locate and repair open circuit or short circuit.- Check ABS return flow pump relay -J105-, ABS return
flow pump -V39- and ABS hydraulic unit -N55-, carry out
"electrical test", step 12+17 page 01
-68
, "Read
measuring value block", display group 2 page 01
-65
.
Pa
ge 66 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-108

Output on printer
of VAG1551 Scan
Tool (ST) Possible cause
Corrective action
DTC
00302
ABS solenoid
valve relay -J106-
Faulty wire connection or excessively large
contact resistance in Ground (GND)
connection to ABS solenoid valve relay -
J106-.
Open circuit or short circuit to B+ or Ground
(GND) in wiring between ABS solenoid
valve relay -J106- and the ABS control
module -J104-.
ABS solenoid valve relay -J106- or ABS
hydraulic unit -N55- malfunctioning. Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Electrical Wiring Diagrams, Troubleshooting &
Component Locations - Check Ground (GND) connection for contact
resistance and faulty wiring.
- Locate and repair open circuit or short circuit.- Check ABS solenoid valve relay -J106- and ABS
hydraulic unit, carry out "electrical test", step 11
page 01
-68
, "Read measuring value block", display
group 2 page 01
-65
.
Pa
ge 67 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-109

Output on printer of
VAG1551 Scan Tool
(ST) Possible cause
Corrective action
DTC
00526
Brake light switch -F-
FWD:
Open circuit
Both brake lights -M9- (left) and -M10- (right)
malfunctioning or ABS control module -J104-
malfunctioning.
Wire from brake lights to control module faulty. Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Locate and repair open circuit or
short circuit.
- Replace bulbs.
- Check brake light switch, "Read
measuring value block", display
group 2 page 01
-65
.
AWD:
Implausible signal
Open circuit or short circuit to B+ or Ground (GND) in
wiring between brake light switch and the bulbs for brake
lights -M9- (left), -M10- (right) or ABS control module -
J104-.
Bulb for left brake light -M9- or right brake light -M10-
malfunctioning.
Brake light switch malfunctioning.
Pa
ge 68 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-110

Output on printer of
VAG1551 Scan Tool
(ST) Possible cause
Corrective action
DTC
00529
Wheel speed information
missing
No signal

This malfunction only
occurs if vehicle is
equipped with ASR.
Open circuit or short circuit to B+ or
Ground (GND) in wiring between ABS
control module -J104- and Engine
Control Module (ECM).
Electrical Wiring Diagrams, Troubleshooting &
Component Locations - "Read measuring value block", display group 3
page 01
-67
.
- Locate and repair open circuit or short circuit.


Engine Control Module (ECM)
malfunctioning. - If the tachometer in the instrument cluster is
malfunctioning and no malfunctions can be found in
the wiring, the Engine Control Module (ECM) is
malfunctioning and must be replaced.

ABS control module -J104-
malfunctioning - If the tachometer in the instrument cluster
functions properly and no malfunctions can be
found in the wiring, the ABS control module
(w/EDL) -J104- is malfunctioning and must be
replaced.
Pa
ge 69 of 79 Read Measurin
g Value Block
(function 08
)
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-111

Output on printer of VAG1551 Scan Tool
(ST) Possible cause
Corrective action
DTC
00532
Voltage supply
Signal too small

Notes:

This malfunction affects the voltage supply
of the control module.
This DTC is only stored, if the malfunction
occurs at a vehicle speed above 6 km/h.
As soon as vehicle voltage is within the
valid voltage range again, the ABS,
ABS/EDL or ASR system is switched back
on and the warning lights turn off.
Open circuit or resistance too high
between voltage supply of terminal 15
and ABS control module -J104-
(terminal 1). Voltage jumps in vehicle system.Battery malfunctioning.
Electrical Wiring Diagrams,
Troubleshooting &
Component Locations
Repair Manual, Electrical
Equipment, Repair Group 90; Instrument cluster
- Carry out "Electrical test",
step 23 page 01-68
.
- Locate and repair open
circuit or contact resistance.
- Check Generator (GEN.)
and Voltage Regulator (VR). - Check battery
Pa
ge 70 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8