Fiat STILO 2.4 20v da 07/02 a 06/03 – COMPRESSOR ENGAGEMENT – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram - COMPRESSOR ENGAGEMENT - Fiat STILO 2.4 20v da 07/02 a 06/03

COMPRESSOR ENGAGEMENT - WIRING DIAGRAM Fiat STILO 2.4 20v da 07/02 a 06/03

Components - COMPRESSOR ENGAGEMENT - Fiat STILO 2.4 20v da 07/02 a 06/03

Component code	Name	Assembly reference
B1	Engine compartment junction unit
B99	Maxifuse box on battery
H80	Climate control controls
H81	Climate control fan control
K86	Frost sensor	-
L20	Air conditioning compressor "on" electromagnet
M10	Engine management ECU
M10	Engine management control unit	-
M10	Engine management control unit
M70	Climate control system control unit
O30	Air fan adjustment resistance	-
O30	Passenger compartment air fan adjustment resistor	-

Location of components - COMPRESSOR ENGAGEMENT - Fiat STILO 2.4 20v da 07/02 a 06/03

COMPRESSOR ENGAGEMENT - LOCATION OF COMPONENTS Fiat STILO 2.4 20v da 07/02 a 06/03

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Components - COMPRESSOR ENGAGEMENT - Fiat STILO 2.4 20v da 07/02 a 06/03

Component code	Name	Assembly reference
B1	Engine compartment junction unit
B99	Maxifuse box on battery
H80	Climate control controls
H81	Climate control fan control
K86	Frost sensor	-
L20	Air conditioning compressor "on" electromagnet
M10	Engine management ECU
M10	Engine management control unit	-
M10	Engine management control unit
M70	Climate control system control unit
O30	Air fan adjustment resistance	-
O30	Passenger compartment air fan adjustment resistor	-

Description - COMPRESSOR ENGAGEMENT - Fiat STILO 2.4 20v da 07/02 a 06/03

The centre button in the climate control control panel in the centre of the dashboard switches on the air cooling and dehumidifying circuit, activating the air conditioning compressor.The above button enables the operation of the air cooling circuit; but the actual switching on of the compressor also depends on the intervention of:the fan linear sensor, located in the refrigerant circuit, which stops the air conditioning being switched on if the pressure of the fluid is too low or too high;the engine control unit which, according to the engine management logic, excludes the operation of the compressor, for example in the case of high engine temperatures or in the case of high engine loads (sharp acceleration).

Description - COMPRESSOR ENGAGEMENT - Fiat STILO 2.4 20v da 07/02 a 06/03

The appropriate button in the climate control control panel enables operation of the air cooling circuit; when the button is pressed the LED comes on.The above button enables the operation of the air cooling circuit; the actual switching on of the compressor, however, also depends on the climate control system ECU operating strategy.The compressor can also be switched off by the intervention of the fan linear sensor or the engine management control unit.

Description - COMPRESSOR ENGAGEMENT - Fiat STILO 2.4 20v da 07/02 a 06/03

For more detailsWith the compressor switched on, the fan is operated at the first speed by means of a special relay located inside the unit.The fan is supplied by a line protected by a specific fuse and operated by a special relay, in the engine compartment junction unit.The fan is supplied by a line protected by a specific fuse and operated by a special relay, in the engine compartment junction unit.The supply for the controls comes via a line controlled by the ignition and protected by a fuse in the underdashboard control unit.

Functional description - COMPRESSOR ENGAGEMENT - Fiat STILO 2.4 20v da 07/02 a 06/03

Relay T5 of engine bay control unit B1 controls the compressor activation circuitThe relay power supply passes through the line of dedicated fuse F19 of engine bay junction unit B1 The power supply to the coil of relay T5 arrives from main injection relay T9 and ignition-opeated line (15/54) protected by fuse F18, both located in engine bay control unit B1.