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Voltage tester V.A.G 1527,
- Adapter cable V.A.G 1598/11 connected
Test step V.A.G 1598
socket
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if speci‐
fied value not at‐
tained
3.3 3
and
earth
Power supply for
control unit -J126
(via fresh air blower
-V2)
▪ Ignition on. - approx. battery
voltage
- Use current flow di‐
agram to repair pow‐
er supply.
3.4 4
and
16
Control unit -J126 ▪ Ignition on. - LED in voltage test‐
er lights up.
- Use current flow di‐
agram to locate and
eliminate open cir‐
cuit in the wiring be‐
tween -J126 and -
E87.
Find open circuit in
earth wiring to -J126
and eliminate.
Check freedom of
movement of fresh
air blower -V2.
- Fresh air blower is
running
- Replace control
unit -J126.
Note:
Earth applied e.g. to connector D contact 14.
Test step 4
Positioning motors for air conditioner and associated potentiometers
Select measuring range on hand-held multimeter V.A.G 1526:
Resistance measurement (20 kω)
- Adapter cable V.A.G 1598/11 connected
Test step V.A.G 1598
socket
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if speci‐
fied value not at‐
tained
4.1 25
and
36 /
37 /
38 /
39
Potentiometer (in
the positioning mo‐
tor)
-G 92 (-V 68)
-G114 (-V85)
-G112 (-V70)
-G113 (-V71)
- Greater than 0.1
kωand less than
5.7kω ((depending
on the setting of the
positioning motor)
- Use current flow di‐
agram to locate and
eliminate open cir‐
cuit, contact resist‐
ance or short circuit
Replace positioning
motor
4.2 34
and
36 /
37 /
38 /
39
Potentiometer (in
the positioning mo‐
tor)
-G 92 (-V 68)
-G114 (-V85)
-G112 (-V70)
-G113 (-V71)
- Greater than 0.1
kωand less than
5.7kω ((depending
on the setting of the
positioning motor)
- Use current flow di‐
agram to locate and
eliminate open cir‐
cuit, contact resist‐
ance or short circuit
Replace positioning
motor
Notes:
◆ The resistance of potentiometers in the positioning motors (specified value: 3.6 kωto 5.7 kω between contact
1 and 3) can only be measured directly on the positioning motor (parallel connection).
◆ The resistance of the potentiometers in the positioning motors (between contacts 1 and 2, as well as contacts
3 and 2) is governed by the setting of the positioning motor, it must only be measured with the positioning
motorfitted. The maximum specified value will not be obtained in test steps 4.1 and 4.2. (To obtain the
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
10.4 - Checking in vehicles with an operating and display unit with one display 65
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