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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 52
and
28 /
29 /
37 /
30
Potentiometer (in
the positioning mo‐
tor)
-G 92 (-V 68)
-G112 (-V70)
-G113 (-V71)
-G114 (-V85)
- 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 8
and
28 /
29 /
37 /
30
Potentiometer (in
the positioning mo‐
tor)
-G 92 (-V 68)
-G112 (-V70)
-G113 (-V71)
-G114 (-V85)
- 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
maximum specified value, all connectors on the other positioning motor would have to be detached during
the measurement; the motors are connected in parallel).
◆ If -E87 detects the fault "potentiometer short to earth or open circuit/short to positive", check all the poten‐
tiometers (in the 4 positioning motors) and the corresponding wiring.
◆ On vehicles with right-hand drive, connections 1 and 3 as well as 4 and 6 on the positioning motor are
reversed (check part number and current flow diagram).
Select measuring range on hand-held multimeter V.A.G 1526:
Resistance measurement (200 ω)
- Adapter cable V.A.G 1598/12 connected
Test step V.A.G 1598
socket
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if specified
value not attained
4.3 2
and
10
Temperature flap
positioning motor -
V68
- 20 ωto 100ω. - Use current flow di‐
agram to locate and
eliminate open circuit,
contact resistance or
short circuit
Replace positioning
motor
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
54 01 - Self-diagnosis, Electrical check
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