S4 Quattro Wagon V8-4.2L (BHF) (2008)
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Control Module HVAC: Component Tests and General Diagnostics
High Pressure Sensor Connector Assignment
High Pressure Sensor Connector Assignment
Terminal - 1 - Ground (GND)
Contact - 2 - signal output (square wave signal to the Climatronic control module (J255) A/C control head )
Terminal - 3 - B+ (terminal "75")
‹› With harness connector - B - disconnected, the compressor will not switch on.
‹› High pressure sensor - A - is an electronic control module; it creates a square wave signal, the duty cycle ratio changes with pressure in the
refrigerant circuit => [ High Pressure Sensor Pressure Signal ].
