Audi A3 1997 - Page 78

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-> 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
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if specified
value not attained
1.1 Connector B
contact 3
and
connector A,
contact 6
Voltage supply - approx. battery volt‐
age
- Use current flow dia‐
gram to repair power
supply and/or earth
connection.
1.2 Connector B
contact 4
and
connector A,
contact 6
Voltage supply - approx. battery volt‐
age
- Use current flow dia‐
gram to repair power
supply.
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 specified
value not attained
1.3 Connector A
contact 4
and
connector A,
contact 6
Voltage supply - approx. battery volt‐
age
- Use current flow dia‐
gram to repair power
supply.
1.4 Connector A
contact 9
and
connector A,
contact 6
Voltage supply ▪ Ignition on. - approx. battery volt‐
age
- Use current flow dia‐
gram to repair power
supply.
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
72 01 - Self-diagnosis, Electrical check