Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Test step Contact at
connector
to -J293
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if speci‐
fied value not at‐
tained
2.1 Connector
B contact 2
and
connector
A, contact 6
"Fan ON" signal (1st
speed) from temper‐
ature switch -F54.
▪ only to be per‐
formed in vehicles
without map-control‐
led cooling
▪ Connector de‐
tached from tem‐
perature switch -
F18/-F54, and con‐
tacts 1 and 2 jum‐
pered
▪ Ignition on.
- approx. battery
voltage
Radiator fan run‐
ning at speed 1
- Use current flow di‐
agram to rectify volt‐
age supply to tem‐
perature switch -
F54.
Use current flow di‐
agram to locate and
eliminate open cir‐
cuit in the wiring be‐
tween temperature
switch -F54 and
control unit -J293.
Use current flow di‐
agram to locate and
eliminate open cir‐
cuit in the wiring to
fans -V7.
Service radiator fan
-V7.
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Test step Contact at
connector
to -J293
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if speci‐
fied value not at‐
tained
2.2 Connector
A contact 7
and
connector
A, contact 6
"Fan ON" signal (2nd
speed) from temper‐
ature switch -F18.
▪ only to be per‐
formed in vehicles
without map-control‐
led cooling
▪ Connector de‐
tached from tem‐
perature switch -
F18/-F54, and con‐
tacts 2 and 3 jum‐
pered
▪ Ignition on.
- approx. battery
voltage
- Use current flow di‐
agram to rectify volt‐
age supply to tem‐
perature switch -
F18.
Use current flow di‐
agram to locate and
eliminate open cir‐
cuit in the wiring be‐
tween temperature
switch -F18 and
control unit -J293.
Notes:
◆ Test step 2.2 is only to be performed in vehicles without map-controlled engine cooling.
◆ In vehicles with map-controlled cooling the radiator fans are switched on and off by the engine control unit
dependent on the engine load and the refrigerant temperature (temperature switch -F18/-F54 is not instal‐
led).
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
11.3 - Electrical check at control unit -J293 (version for High-pressure sensor -G65) 79
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