1999 AUDI A4 wiring

01-137

Adapter cable VAG1598/11
LED Voltage tester VAG1527B
Test
Step VAG1598
socket Test of
Test
conditions
- additional
work Specified Value
Corrective action
1.9 term.15 1) +
33 Signal for time
span ignition
off
Ignition
on - LED lights up - Diagnose and repair short or open
circuit in wiring/connections using wiring
diagram.
1.10 term.15 1) +
33 Signal for time
span ignition
off Ignition
on



- Start
engine. - LED lights up



- LED flickers briefly
(time signal) and then
lights up again - Diagnose and repair short or open
circuit in wiring/connections using wiring
diagram.
- Check signal from instrument cluster.
1) Terminal 15 (ignition) is available at -E87- connector -D-, terminal -9-.
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01-138
Test No. 2 (Temperature Sensors -G17-, -G56-, -G89-, G191-, G192-. ) Adapter cable VAG1598/11
Measuring range: Resistance measurement (20 K / 200 K ) Test
Step VAG1598
socket Test of
Test conditions
- additional work Specified Value
Corrective action
2.1 to
2.3 page 01
-122

2.4 26 + 49 Sender for outlet
temperature,
center -G191-. - Measure
temperature at
mounting location
of sensor. - Dependant on temperature
at mounting location of
sensor - Diagnose and repair short,
open circuit or contact
resistance in
wiring/connections using
wiring diagram.
2.5 25 + 49 Sender for outlet
temperature, floor
outlet -G192-. - Measure
temperature at
mounting location
of sensor. Confirm using
temperature/resistance
table page 01
-139

- Replace sensor(s)
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01-140
Test No. 3 (Fresh Air Blower -V2- and Control Module for Fresh Air Blower -J126-) Adapter cable VAG1598/11
Measuring range: Voltage measurement (20 V)
Test Step
VAG1598 socket
Test of
Test conditions
- additional work Specified Value
Corrective action
3.1 to 3.3 page 01
-124

Adapter cable VAG1598/11
LED Voltage tester VAG1527B
Test
step VAG1598
socket Test of
Test
conditions
- additional
work Specified
Value Corrective action
3.4 14 + 16 Control module for
fresh air blower -
J126-
Ignition
on - LED lights up - Diagnose and repair open circuit in
wiring between -J126- and -E87- using
wiring diagram.
- Fresh Air Blower -V2- check for ease of
movement.

- Fresh air
blower running. - Replace -J126-.
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01-141
Test No. 4 (air/temperature distribution flap motors and related potentiometers) Adapter cable VAG1598/12
Measuring range: Resistance measurement (20 K ) Test
Step VAG1598
socket Test of
Test
conditions
- additional
work Specified
Value Corrective action
4.1 to
4.6 page 01
-126

4.7 14 +
2
3
4
5 Short to ground of wiring to
flap motors -V68-, -V85-, -
V70-, -V71-
Ignition
off - Ohm
- Diagnose and repair short to ground in
wiring/connections using wiring diagram.
Adapter cable VAG1598/12
Measuring range: Voltage measurement (20 V)
Test
Step VAG1598
socket Test of
Test
conditions
- additional
work Specified
Value Corrective action
4.8 14 + 2
3 Short to positive of wiring to
flap motors -V68-, -V85-, -
Ignition
on - less than
1V - Diagnose and repair short to positive
in wiring/connections using wiring
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4
5 V70-, -V71-
diagram.
Note:
If DTC's for several flap motors are shown and malfunction is not determined in test 4, check wiring for short between
individual flap motors (e.g. -V85- and -V70-, measured value between sockets 3 and 4 must be Ohm).
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01-143

A/C control head -E87- connected to test box with adapter cable VAG1598/11
LED Voltage tester VAG1527B
Test
Step VAG1598
socket Test of
Test conditions
- additional work Specified
Value Corrective action
5.8 14 + 12 "A/C compressor
intervention"
output.
Engine
running. A/C
compressor
off
- Switch on A/C
compressor - LED lights
up


- LED lights
up slightly
dimmer. - Diagnose and repair open or short circuit in
wiring/connections using wiring diagram.
- Diagnose and eliminate A/C compressor
cut-off condition(s) from Engine Control
Module (ECM) or Transmission Control
Module (TCM)
- Diagnose and repair short circuit to ground
in wiring/connections using wiring diagram.
5.9 Ground
and
51 "Engine
temperature too
high" signal. Engine
running. - LED lights
up. - Diagnose and repair short circuit to ground
in wiring/connections using wiring diagram.
- Diagnose and eliminate A/C compressor
cut-off condition from Instrument cluster
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01-144

A/C control head -E87- connected to test box with adapter cable VAG1598/11
Measuring range: Current measurement (200 mA)
Test
Step VAG1598
socket Test of
Test conditions
- additional work Specified
Value Corrective action
5.10 Ground
and
12
"A/C compressor
intervention"
output.
Engine running. A/C compressor
off

- Switch on A/C
compressor



- Remove multimeter
connector probes
from test box - Less than 5
mA



- Less than
50 mA
- Compressor
does not en-
gage
- Compressor
engages
Repair Manual, Fuel Injection and
Ignition
Repair Manual, Automatic
Transmission - Diagnose and repair short circuit to
positive in wiring/connections using
wiring diagram.
- Replace A/C control head -E87-.



- Diagnose and eliminate A/C
compressor cut-off condition(s) from
Engine Control Module (ECM) or
Transmission Control Module (TCM)
- Diagnose and repair short circuit to
ground in wiring/connections using
wiring diagram.
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01-145

Adapter cable VAG1598/11 connected.
Measuring range: Resistance measurement (200 ) Test
Step VAG1598
socket Test of
Test
conditions
- additional
work Specified
Value Corrective action
5.11 2 + 42 A/C pressure switch -
F129- (between
terminals 1 and 2)
Ignition
off - Less than
20
- Diagnose and repair open circuit or contact
resistance in wiring/connections using wiring
diagram.1).
- Check A/C pressure switch -F129- page 87
-67
.
1) If compressor cut-off condition code 1, "A/C pressure switch -F129- open" etc. appears in read measuring value block,
display group 1, display field 1: - check for intermittent contact in wiring/connections to -F129- using wiring diagram - check
function of Coolant Fan -V7- stage 1 with Output DTM (function
03)
page 01
-42
- check A/C pressure switch -F129- function
(actuation of -V7- stage 2, terminals 3 and 4 page 87
-67
). If no fault is determined, check A/C refrigerant system pressures
page 87
-190
.
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