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Test step Component tested Page
6 - Actuation of air conditioner magnetic clutch -N25.
Actuation of radiator fan -V7
Actuation of two-way valve for refrigerant shut-off valve -N147
69
Test step 1
Voltage supply, earth connection, illumination of the operating and display unit -E87 and signal for "ignition off
time" (standing time)
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 15
and
14
Terminal 15 and
earth connection on
-E87
▪ Ignition on. - Approx. battery
voltage
- Use current flow di‐
agram to repair pow‐
er supply and/or
earth connection.
1.2 15
and
13
Earth connection at
the -E87
▪ Ignition on. - Approx. battery
voltage
- Use current flow di‐
agram to repair
earth connection.
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
1.3 12
and
14
Terminal 58 on -
E87
▪ Ignition on.
▪ Switch side lights
on
- Approx. battery
voltage
- Use current flow di‐
agram to repair
power supply.
1.4 12
and
14
Terminal 58 on -
E87
▪ Ignition on.
▪ Side lights off
- less than 2 V - Use the current
flow diagram to rec‐
tify short to positive.
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
1.5 10 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
1.6 10 and
earth
Terminal 58d on -
E87
▪ Ignition on.
▪ Side lights off
- 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
Notes:
◆ Earth applied e.g. to connector D contact 14.
◆ The brightness of the display of the -E87 is controlled via terminal 58d.
◆ The voltage at terminal 58d is generated as a square-wave signal by the dash panel insert. The brightness
of -E87 displays is determined by the actuation time. The measuring instrument displays the average value.
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
10.4 - Checking in vehicles with an operating and display unit with one display 61
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