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=> Parts List
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
◆ Control unit -J293, installed in vehicles with high-pressure sensor -G65, is available in 2 designs.
- In design "1" the radiator fan is automatically switched on in conjunction with the compressor (the first
fan speed is activated regardless of the pressure in the refrigerant circuit).
- In design "2" the compressor is switched on without the radiator fan; the first fan speed is only activated
once the pressure in the refrigerant circuit has exceeded 12 bar.
-> Pin assignment for high-pressure sensor -G65
Contact 1, earth
Contact 2, signal output (square-wave signal to -J293 and to engine control unit)
Contact 3, positive (terminal 15)
Notes:
◆ -> The compressor will not be switched on if connector -B- is disconnected.
◆ High-pressure sensor -A- is an electronic control unit that generates a square-wave signal whose duty cycle
changes with refrigerant circuit pressure =>Page 85 .
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).
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
11.3 - Electrical check at control unit -J293 (version for High-pressure sensor -G65) 77
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