Fiat BRAVO 1.9 JTD 16v – COMPRESSOR ENGAGEMENT – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

WIRING DIAGRAM - COMPRESSOR ENGAGEMENT - Fiat BRAVO 1.9 JTD 16v

COMPRESSOR ENGAGEMENT - WIRING DIAGRAM Fiat BRAVO 1.9 JTD 16v

COMPONENTS - COMPRESSOR ENGAGEMENT - Fiat BRAVO 1.9 JTD 16v

Component code	Description	Reference to the operation
B001	JUNCTION UNIT
B002	JUNCTION UNIT UNDER DASHBOARD
B099	MAXI FUSE BOX ON BATTERY	-
C010	LEFT FRONT EARTH	-
C016	AIR CONDITIONING UNIT EARTH	-
C038	EARTH ON CENTRE TUNNEL	-
C039	COMPRESSOR EARTH	-
D004	FRONT/ENGINE COUPLING	-
D008	AIR CONDITIONING-HEATER FRONT COUPLING	-
H001	IGNITION SWITCH
H080	AIR CONDITIONING CONTROLS
H081	CLIMATE CONTROL FAN CONTROL
J034	PASSENGER COMPARTMENT AIR FAN SPEED RELAY 1	-
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
N085	PASSENGER COMPARTMENT AIR FAN
O030	PASSENGER COMPARTMENT AIR FAN ADJUSTMENT RESISTOR

COMPONENT LOCATION - COMPRESSOR ENGAGEMENT - Fiat BRAVO 1.9 JTD 16v

COMPRESSOR ENGAGEMENT - COMPONENT LOCATION Fiat BRAVO 1.9 JTD 16v

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Component code	Description	Reference to the operation
B001	JUNCTION UNIT
B002	JUNCTION UNIT UNDER DASHBOARD
B099	MAXI FUSE BOX ON BATTERY	-
C010	LEFT FRONT EARTH	-
C016	AIR CONDITIONING UNIT EARTH	-
C038	EARTH ON CENTRE TUNNEL	-
C039	COMPRESSOR EARTH	-
D004	FRONT/ENGINE COUPLING	-
D008	AIR CONDITIONING-HEATER FRONT COUPLING	-
H001	IGNITION SWITCH
H080	AIR CONDITIONING CONTROLS
H081	CLIMATE CONTROL FAN CONTROL
J034	PASSENGER COMPARTMENT AIR FAN SPEED RELAY 1	-
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
N085	PASSENGER COMPARTMENT AIR FAN
O030	PASSENGER COMPARTMENT AIR FAN ADJUSTMENT RESISTOR

DESCRIPTION - COMPRESSOR ENGAGEMENT - Fiat BRAVO 1.9 JTD 16v

The special button (ice symbol) on the climate control system control unit switches on the air cooling and dehumidification circuit, activating the air conditioning compressor.The above button enables the operation of the air cooling circuit, but the actual compressor activation is also dependent upon the activation of:- 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);Automatic climate control: If the compressor is enabled and the engine started, the control unit that controls the manual ventilation does not go below a minimum value.Manual climate control: when the compressor is activated, the fan is also driven at first speed via a relay located inside the unit.For more detailsThe supply circuit for the compressor is controlled by a specific relay and protected by a special fuse, both located in the engine compartment junction unit.The fan receives a power supply from a line protected by a special fuse and operated by a specific relay in the engine compartment junction unit.The controls receive a power supply from an ignition-controlled line protected by a fuse in the junction unit under the dashboard.

FUNCTIONAL DESCRIPTION - COMPRESSOR ENGAGEMENT - Fiat BRAVO 1.9 JTD 16v

The relay T5 for the engine compartment junction unit B1 controls the compressor engagement circuit.The supply for the relay via the line for specific fuse F19 of the engine compartment junction unit B1.The power supply for the coil for relay T5 arrives from the main injection relay T9 and from the line protected by fuse F18, both located in the engine compartment junction unit B1.Automatic climate control:The climate control system control unit M70 - from pin 4 of connector C - sends the enablement signal for the engagement of the compressor to the engine management control unit M10, pin 54 of connector A.Manual climate control:When the unit button H80 is pressed, two signals are sent:- one signal to the engine management control unit M10, pin 54 of connector A.- a second signal excites the coil of relay J34, which controls activation of the first speed of air fan N85, as describedFan N85 - supplied by the ignition-operated line (INT/A) of relay T8 and specific fuse F8 of engine compartment control unit B1 is operated at first speed if the compressor activation request button is pressed, even if control knob H81 is in position "0".On the basis of its internal control logic, the control unit M10 sends the command - from pin 29 of connector A - to engage the compressor which energizes the relay T5 so that the air conditioning compressor engagement solenoid L20 is operated at a voltage of 12 V.If the linear sensor for the fans K120 signal to the control unit M10 - pin 13 of connector A - that the pressure value is too high or too low, then the control unit M10 excludes the engagement of the compressor.The linear sensor K120 receives a power supply and reference earth from the engine management control unit M10, pin 12 and 22 of connector A.