light AUDI A4 1996 B5 / 1.G AC System Electrical Testing Workshop Manual

01-121

VAG1598/12 adapter cable Measuring range: Voltage measurement (20 V)
Test
step VAG1598
socket Test of
Test
conditions
- additional
steps Specified values
Corrective action
1.4 13 and
ground Terminal 30
at E87
Ignition off - approx. battery voltage - Repair voltage supply using
wiring diagram.
1.5 7 and
ground Terminal 58
at E87 Ignition on Parking
lights on - approx. battery voltage - Repair voltage supply using
wiring diagram.
1.6 7 and
ground Terminal 58
at E87 Ignition on Parking
lights on - less than 2 V - Rectify short circuit to positive
using wiring diagram.
1.7 45 and
ground Terminal 58D
at E87 Ignition on Parking
lights on - 0 to 12 V (depends on
setting of illumination
rheostat) - Determine and rectify open circuit
or short circuit using wiring
diagram.
1.8 45 and
ground Terminal 58D
at E87 Ignition on Parking
lights off - less than 2 V - Rectify short circuit to positive
using wiring diagram.
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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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01-140
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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01-143

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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01-147
Notes:
The following test steps are only performed for A/C control heads -E87- with two displays:

Teststep 2.2 (the instrument panel interior temperature sensor -G56- is installed in A/C control heads -E87- with one
display)
Test step 5.7 (the interior temperature sensor fan -V42- is installed in A/C control heads -E87- with one display)
Switch on test area at VAG1526 multimeter: voltage test (20 V =)

VAG1598/11 adapter cable connected
Test
step VAG1598A
socket Test of
Test
requirements
- additional
operations Specified
value Corrective action
1.15
4) 46 + Ground
3) Power supply
terminal 58 of A/C
control head -E87-
Ignition
switched on Park light
switched on

approx.
battery
voltage - Locate and repair open circuit or short
circuit to Ground in wiring connection to
A/C control head -E87- using wiring
diagram
1.16
4) 46 + Ground
3) Power supply
terminal 58 of A/C
control head -E87-
Ignition
switched on Park light
- Locate and repair open circuit or short
circuit to Ground in wiring connection to
A/C control head -E87- using wiring
diagram.
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01-149

VAG1527 B Voltage Tester

A/C control head -E87- connected at test box (VAG1598/11 and /12 adapter cables)
VAG1598/11 adapter cable connected
Test
step VAG1598A
socket Test of
Test
requirements
- additional
operations Specified value
Corrective action
5.9 5) Ground
+
51 "Engine temperature
too high" signal
Engine
running
LED on
voltage tester
lights - Locate short circuit to Ground
and repair according wiring
diagram
- Eliminate A/C compressor cut-
off conditions in instrument
cluster
5) Only perform this test step for vehicles of m.y. 1997 or later
Notes:
Ignition key coding is transmitted to the A/C control head -E87- from the instrument cluster along with the coolant
temperature and the signal "engine temperature too high" when ignition is switched on for vehicles as of m.y. 1999 (data
message). Key coding can only be processed by A/C control heads -E87- with part number 8D0 820 043 after index "M."
No information can be transmitted if the coolant temperature is too high.
When ignition is switched on, A/C control head -E87- begins with the setting that was valid when the ignition was last
switched off with this key (temperature, air distribution, fresh air blower RPM).
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01-150
List of changes to electrical tests, 1998 VAG1527B voltage tester
VAG1598/11 adapter cable connected
Test
step VAG1598
sockets Test of
Test
conditions
- additional
operations Specified
value Corrective action
1.9 33 +
GND Signal for
"ignition off"
period
Ignition
switched on LED on voltage tester lights
- Repair open circuit or
short circuit according to
wiring diagram.
1.10 33 +
GND Signal for
"ignition off"
period Ignition
switched on
- Start engine.LED in voltage tester lights up
When starting engine, LED briefly
flickers in voltage tester (time signal)
and then lights constantly - Repair open circuit or
short circuit according to
wiring diagram.
- Check instrument cluster.
Note:
Test steps 1.9 and 1.10 apply only for vehicles beginning m.y. 1997 (A/C control head with Part No. 8L0 820 043 up to Part
No. index letter "C").
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01-151

Voltage test - switch multimeter to 20V measuring range
VAG1598/11 adapter cable connected
Test
step VAG1598
sockets Test of
Test conditions
- additional
operations Specified
value Corrective action
1.11 7 + GND Terminal 58s on -
E87-
Ignition switched
on Parking light
switched on 0 to 12 V
- Repair open circuit or short circuit
according to wiring diagram.
1.12 7+ GND Terminal 58s on -
E87- Ignition switched
on Parking light
switched off approx. 0
V. - Repair short to B+ according to wiring
diagram.
Notes:

Test steps 1.11 to 1.14 apply for vehicles beginning m.y. 1998 (A/C control head with Part No. 8L0 820 043 from Part No.
index letter "D").
The Ground connection can be made via connector D, terminals 14 and 15 (for example).
The voltage at terminal 58s is dependent on the adjustment of the illumination dimmer control.
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01-152

Voltage test - switch multimeter to 20V measuring range
VAG1598/11 adapter cable connected
Test
step VAG1598
sockets Test of
Test conditions
- additional
operations Specified
value Corrective action
1.13 45 +
GND Terminal 58d on -
E87-
Ignition switched
on Parking light
switched on 0 to12 V
- Repair open circuit or short circuit
according to wiring diagram.
1.14 45 +
GND Terminal 58d on -
E87- Ignition switched
on Parking light
switched off 0 to 12 V
- Repair open circuit or short circuit
according to wiring diagram.
Notes:

Test steps 1.11 - 1.14 apply for vehicles beginning m.y. 1998 (A/C control head with Part No 8L0 820 043 from Part No.
index letter "D").
The Ground connection can be made via connector D, terminals 14 and 15 (for example).
The voltage to terminal 58d is created as a square-wave signal from the instrument cluster. The brightness of the display
on A/C control head -E87- is determined by the period of activation. The multimeter will indicate the average value.
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