Audi A3 1997 Manual page 71

Voltage tester V.A.G 1527,
- Adapter cable V.A.G 1598/11 connected
Test step V.A.G 1598
socket
3.3 3
and
earth
3.4 4
and
16
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
4.1 25
and
36 /
37 /
38 /
39
4.2 34
and
36 /
37 /
38 /
39
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
Testing of ▪ Test conditions
- Additional opera‐
tions
Power supply for ▪ Ignition on.
control unit -J126
(via fresh air blower
-V2)
Control unit -J126 ▪ Ignition on.
Testing of ▪ Test conditions
- Additional opera‐
tions
Potentiometer (in
the positioning mo‐
tor)
-G 92 (-V 68)
-G114 (-V85)
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
-G112 (-V70)
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
-G113 (-V71)
with respect to the correctness of information in this document. Copyright by AUDI AG.
Potentiometer (in
the positioning mo‐
tor)
-G 92 (-V 68)
-G114 (-V85)
-G112 (-V70)
-G113 (-V71)
10.4 - Checking in vehicles with an operating and display unit with one display
Heating, Air Conditioner - Edition 06.2000
Specified value
- approx. battery
voltage
- LED in voltage test‐
er lights up.
- Fresh air blower is
running
Specified value
- Greater than 0.1
kωand less than
5.7kω ((depending
on the setting of the
positioning motor)
- Greater than 0.1
kωand less than
5.7kω ((depending
on the setting of the
positioning motor)
Audi A3 1997 ➤
Remedies if speci‐
fied value not at‐
tained
- Use current flow di‐
agram to repair pow‐
er supply.
- 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.
- Replace control
unit -J126.
Remedies if speci‐
fied value not at‐
tained
- Use current flow di‐
agram to locate and
eliminate open cir‐
cuit, contact resist‐
ance or short circuit
Replace positioning
motor
- Use current flow di‐
agram to locate and
eliminate open cir‐
cuit, contact resist‐
ance or short circuit
Replace positioning
motor
65