Fiat 500 1.3 Multijet – COMPRESSOR ENGAGEMENT – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

WIRING DIAGRAM - COMPRESSOR ENGAGEMENT - Fiat 500 1.3 Multijet

COMPRESSOR ENGAGEMENT - WIRING DIAGRAM Fiat 500 1.3 Multijet

Get access to all wiring diagrams of the car

COMPONENTS - COMPRESSOR ENGAGEMENT - Fiat 500 1.3 Multijet

Component code	Description	Reference to the operation
A001	BATTERY
B001	JUNCTION UNIT
C010	LEFT FRONT EARTH	-
C015	DASHBOARD EARTH, DRIVER'S SIDE	-
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 1.3 Multijet

COMPRESSOR ENGAGEMENT - COMPONENT LOCATION Fiat 500 1.3 Multijet

Get access to all wiring diagrams of the car

Component code	Description	Reference to the operation
A001	BATTERY
B001	JUNCTION UNIT
C010	LEFT FRONT EARTH	-
C015	DASHBOARD EARTH, DRIVER'S SIDE	-
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 1.3 Multijet

The special button ("ice symbol"), located on the climate control system controls (automatic air conditioning) or by pressing the fan speed adjustment ring nut (manual air conditioning), controls the engagement of the air cooling and dehumidifying circuit, activating the air conditioning compressor.The above controls 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 dedicated relay and protected by a dedicated fuse both located in the engine compartment junction unit.

FUNCTIONAL DESCRIPTION - COMPRESSOR ENGAGEMENT - Fiat 500 1.3 Multijet

The relay T05 for the engine compartment junction unit B001 controls the circuit for engaging the compressor.The coil for relay T05 of B001 (pin 58 of connector B) receives an ignition-controlled supply (15/54) along the line protected by fuse F87 of B001.On versions with manual air conditioning, the compressor engagement button, located in the control unit H080, sends the compressor engagement request signal to the Body Computer M001 (pin 49 of connector B) via the electronic thermostat N086.On versions with automatic air conditioning, on the other hand, the climate control system control unit M070 (pins 10 and 9 of connector A) sends the Body Computer M001 (pins 57 and 58 of connector B) this request signal via the B-CAN.In both cases the Body Computer M001 (pins 44 and 45 of connector B) sends the enablement signal, via the C-CAN, to the engine management control unit M010 (pins 64 and 40 of connector A).On the basis of its internal control logic, the control unit M010 (pin 79 of connector A) sends the command for the effective engagement of the compressor energizing relay T05 of B001 (pin 59 of connector B): in this way the air conditioning compressor engagment solenoid L020 is operated with a 12 V voltage.If the linear sensor K120 signal to the control unit M010 (pin 87 of connector A) that the pressure value is too high or too low, then the control unit M010 excludes the engagement of the compressor.The linear sensor K120 receives a power supply and reference earth at pins 37 and 10 respectively of connector A of the engine management control unit M010.