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Test step Component tested Page
5 - Air conditioner pressure switch -F129 /
Signal from control unit for radiator fan -J293.
Temperature sensor blower -V42.
"Air conditioner compressor cut-in" output.
Signal "Engine temperature too high".
55
6 - Actuation of air conditioner magnetic clutch -N25.
Actuation of radiator fan -V7
58
Test step 1
Power supply, earth connection and illumination of operating and display unit -E87.
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
- Adapter cable V.A.G 1598/12 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
1.1 9
and
15
Terminal 15 and
earth connection
on -E87
▪ Ignition on - Approx. battery
voltage
- Use current flow di‐
agram to repair
power supply and/or
earth connection
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
- Adapter cable V.A.G 1598/11 connected
1.2 7 and
earth
Terminal 58 on -
E87
▪ Ignition on.
▪ Switch side lights
on
- Approx. battery
voltage
- Use current flow di‐
agram to repair
power supply
Notes:
◆ Test steps 1.3 to 1.5 must be implemented only for model year 1997 vehicles (operating and display unit
with part no. 8L0 820 043 up to and including index "C").
◆ Earth applied e.g. to connector D contact 15.
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 speci‐
fied value not at‐
tained
1.3 7 and
earth
Terminal 58 on -
E87
▪ Ignition on
▪ Side lights off
- less than 2 V - Use the current
flow diagram to rec‐
tify short to positive
1.4 45 and
earth
Terminal 58d on -
E87
▪ Ignition on
▪ Side lights on
- 0 to 12 V (regard‐
less of the illumina‐
tion control setting)
- Use current flow di‐
agram to locate and
eliminate open cir‐
cuit or short circuit
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
10.3 - Test in vehicles with an operating and display unit with two displays 49
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