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Voltage tester V.A.G 1527,
Operating and display unit connected to the test box (adapter cable V.A.G 1598/11 and /12)
- 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
5.4 14
and
12
"Air conditioner
compressor cut-in"
output
▪ Engine running
▪ Compressor
switched off (frost
symbol in the display
zone of -E87 is not
illuminated).
Switch on compres‐
sor.
- LED in voltage
tester lights up.
LED in voltage test‐
er lights up a little
less brightly.
- Use current flow di‐
agram to locate and
eliminate open cir‐
cuit or short circuit.
Rectify AC com‐
pressor shutoff con‐
dition in the engine
control (emergency
operation).
Rectify AC shutoff
condition in the au‐
tomatic gearbox
control unit -J217.
Use the current flow
diagram to locate
and rectify short to
earth.
Select measuring range on hand-held multimeter V.A.G 1526:
Current measurement (200 mA =)
Operating and display unit connected to the test box (adapter cable V.A.G 1598/11 and /12)
- 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 specified
value not attained
5.5 Earth
and
12
"Air conditioner
compressor cut-in"
output
▪ Engine running
▪ Compressor
switched off.
Switch on compres‐
sor.
- Less than 5 mA
Less than 50 mA
Compressor is not
switched on.
- Use current flow di‐
agram to locate and
eliminate short circuit.
Check actuation of
control unit -J293
(=>Page 70 ).
Renew operating and
display unit -E87.
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
- 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 specified
value not attained
5.6 2
and
earth
Signal from radia‐
tor fan control unit
-J293 (in vehicles
with high-pressure
sensor -G65)
▪ Ignition on. - approx. battery
voltage
- Use current flow dia‐
gram to locate and
eliminate open circuit
or contact resistance.
Check high-pressure
sensor (=>Page
85 ).
Notes:
◆ Test step 5.6 must be implemented only for vehicles with high-pressure sensor -G65.
◆ Earth applied e.g. to connector D contact 15.
◆ Depending on high-pressure sensor -G65 signal, radiator fan control unit -J293:
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
10.3 - Test in vehicles with an operating and display unit with two displays 57
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