Fiat 500 1.4 16v – COMPRESSOR ENGAGEMENT – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

WIRING DIAGRAM - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v

COMPRESSOR ENGAGEMENT - WIRING DIAGRAM Fiat 500 1.4 16v

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COMPONENTS - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v

Component code	Description	Reference to the operation
A001	BATTERY
B001	JUNCTION UNIT
C015	DASHBOARD EARTH, DRIVER'S SIDE	-
C039	COMPRESSOR EARTH	-
D004	FRONT/ENGINE COUPLING	-
D008	AIR CONDITIONING-HEATER FRONT COUPLING	-
H001	IGNITION SWITCH
K120	LINEAR SENSOR FOR FANS
L020	AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET
M001	BODY COMPUTER
M010	ENGINE MANAGEMENT ECU
M070	CLIMATE CONTROL SYSTEM CONTROL UNIT	-

COMPONENT LOCATION - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v

COMPRESSOR ENGAGEMENT - COMPONENT LOCATION Fiat 500 1.4 16v

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Component code	Description	Reference to the operation
A001	BATTERY
B001	JUNCTION UNIT
C015	DASHBOARD EARTH, DRIVER'S SIDE	-
C039	COMPRESSOR EARTH	-
D004	FRONT/ENGINE COUPLING	-
D008	AIR CONDITIONING-HEATER FRONT COUPLING	-
H001	IGNITION SWITCH
K120	LINEAR SENSOR FOR FANS
L020	AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET
M001	BODY COMPUTER
M010	ENGINE MANAGEMENT ECU
M070	CLIMATE CONTROL SYSTEM CONTROL UNIT	-

DESCRIPTION - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v

The special ice symbol button, located on the climate control system controls (automatic air conditioner), or pressing the fan speed adjustment wheel (manual air conditioner), controls the engagement of the air cooling and dehumidifying circuit, activating the air conditioning compressor.The above buttons enable the operation of the air cooling circuit, but the actual compressor activation is also dependent upon the activation of:the linear sensor, located on the refrigerant circuit, which stops the engagement of the air conditioning if the pressure of the refrigerant is too low or too high;the engine management control unit which, depending on the engine management logic, excludes the operation of the compressor, for example in the case of high engine coolant temperature or high engine loads (sharp acceleration).For further details,The compressor supply circuit is controlled by a specific relay and protected by a specific fuse both located in the engine compartment junction unit.

FUNCTIONAL DESCRIPTION - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v

Relay T05 for engine compartment junction unit B001 controls the circuit for engaging the compressor.Relay coil T05 of B001 (pin 58 of connector B) is powered when the ignition is on (15/54), along the line protected by fuse 87 of B001.In versions with manual air conditioning the compressor engagement button, located in control unit H080, sends the compressor engagement request signal to Body Computer M001 (pin 49 of connector B) via electronic thermostat N086.However, in versions with automatic air conditioning, the air conditioning control unit M070 (pins 10 and 9 of connector A) sends this request signal via the B-CAN to Body Computer M001 (pins 57 and 58 of connector B).In both cases Body Computer M001 (pins 44 and 45 of connector B) sends the enabling signal via the C-CAN to engine management control unit M010 (pins 89 and 88 of connector A).On the basis of internal control logic, control unit M010 (pin 11 of connector A) sends the compressor engagement command, exciting relay T05 of B001 (pin 59 of connector B): in this way the air conditioning compressor engagement solenoid L020 is powered with a 12 V voltage.If linear sensor K120 signals to control unit M010 (pin 57 of connector A) that the pressure value is too high or too low, then control unit M010 excludes the engagement of the compressor.Linear sensor K120 receives a power supply and reference earth at pins 28 and 7 respectively of connector A of engine management control unit M010.