Fiat ULYSSE 2.2 16V JTD fino a 04/03 – COMPRESSOR ENGAGEMENT – – MY 2005 – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

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COMPRESSOR ENGAGEMENT WIRING DIAGRAM Fiat ULYSSE 2.2 16V JTD fino a 04/03

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Components - COMPRESSOR ENGAGEMENT - Fiat ULYSSE 2.2 16V JTD fino a 04/03

Component code	Description	Reference to the assembly
A001	BATTERY	-
B001	ENGINE COMPARTMENT JUNCTION UNIT
C020	PASSENGER SIDE DASHBOARD EARTH	-
D001	FRONT/DASHBOARD COUPLING	-
E050	INSTRUMENT PANEL
H001	Ignition switch
K086	FROST SENSOR
K120	LINEAR SENSOR FOR FANS	-
L020	AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET
M001	BODY COMPUTER
M010	ENGINE MANAGEMENT CONTROL UNIT
M070	CLIMATE CONTROL SYSTEM CONTROL UNIT	-

COMPRESSOR ENGAGEMENT COMPONENT LOCATION Fiat ULYSSE 2.2 16V JTD fino a 04/03

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Component code	Description	Reference to the assembly
A001	BATTERY	-
B001	ENGINE COMPARTMENT JUNCTION UNIT
C020	PASSENGER SIDE DASHBOARD EARTH	-
D001	FRONT/DASHBOARD COUPLING	-
E050	INSTRUMENT PANEL
H001	Ignition switch
K086	FROST SENSOR
K120	LINEAR SENSOR FOR FANS	-
L020	AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET
M001	BODY COMPUTER
M010	ENGINE MANAGEMENT CONTROL UNIT
M070	CLIMATE CONTROL SYSTEM CONTROL UNIT	-

The special button on the climate control system in the centre of the dashboard switches on the air cooling and dehumidification circuit, activating the air conditioning compressor.The above button enables operation of the air cooling circuit, but actual compressor activation is also dependent upon activation of:the frost thermostat sensor, located near the evaporator, which stops the engagement of the air conditioning if the temperature of the evaporator is too low;the fan linear sensor, located on the coolant circuit that locks air conditioner activation if coolant pressure is too low or high;the engine control unit that excludes compressor operation in accordance with engine management mode; e.g. in the case of high engine temperatures or high engine load (sudden acceleration).

The compressor activation control is given by pressing the key housed on the climate control unit M070.Control unit M070 (pin 10 connector A) receives power via a line protected by fuse F14 leaving body computer node M001 (pin 6 connector D) and communicates via the CAN line (pins 14 and 15 connector A) with instrument panel E050 (pins 6 and 12) and with body computer node M001 (pins 8 and 10 connector D).Body computer M001, again via the CAN line, forwards the command to engine control unit M010 (pins A3 and A4 connector A), enables or disables compressor activation (pins F2, H2 and F4 connector A) from linear sensor K120 (pin 1, 2 and 3).Compressor L020 is supplied (pins 1 and 2) from engine compartment junction unit B001 (pins 1 and 5 connector C), which is connected in turn (pins 12 and 11 connector F) via the CAN line to body computer node M001 (pins 25 and 27 connector C).Demister sensor K086 is also connected (pins 1 and 2) to body computer node M001) (pins 17 and 16 connector E respectively): the signal contains information on the evaporator temperature, which is also sent to control unit M070.