Audi A3 1997 Manual page 78

Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
-> Pin assignment for air conditioner pressure switch -F129
Switch between contact 1 and 2 (opens in the event of vacuum and overpressure in the refrigerant circuit - the
compressor is switched off)
Switch between contacts 3 and 4 (closes if pressure increases in the refrigerant circuit - the radiator fan is
switched to 2nd speed)
Pin assignment at refrigerant temperature switch -F18 / -F54
Switch -F54 (between contact 1 and 2 closes at approx. 95 °C - the radiator fans are switched to 1st speed).
Switch -F18 (between contact 3 and 2 closes at approx. 102 °C - the radiator fans are switched to 2nd speed).
Refrigerant temperature control switch (too hot) -F14
Switch opens at approx. 118 °C - the compressor is switched off.
Note:
Only installed in vehicles with pressure switch -F129
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
Test step 1 (voltage supply)
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Test step Contact at
connector to
-J293
1.1 Connector B
contact 3
and
connector A,
contact 6
1.2 Connector B
contact 4
and
connector A,
contact 6
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Test step Contact at
connector to
-J293
1.3 Connector A
contact 4
and
connector A,
contact 6
1.4 Connector A
contact 9
and
connector A,
contact 6
72
01 - Self-diagnosis, Electrical check
Testing of ▪ Test conditions
- Additional opera‐
tions
Voltage supply
Voltage supply
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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.
Testing of ▪ Test conditions
- Additional opera‐
tions
Voltage supply
Voltage supply ▪ Ignition on.
Specified value
- approx. battery volt‐
age
- approx. battery volt‐
age
Specified value
- approx. battery volt‐
age
- approx. battery volt‐
age
Remedies if specified
value not attained
- Use current flow dia‐
gram to repair power
supply and/or earth
connection.
- Use current flow dia‐
gram to repair power
supply.
Remedies if specified
value not attained
- Use current flow dia‐
gram to repair power
supply.
- Use current flow dia‐
gram to repair power
supply.