Fiat STILO 2.4 20v da 07/03 a 12/03 – AIR CONDITIONING – – Webasto – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

AIR CONDITIONING - WIRING DIAGRAM Fiat STILO 2.4 20v da 07/03 a 12/03

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Components - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

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	-
K87	Lower treated air sensor
K88	Upper treated air sensor
M1	Body computer
M70	Climate control system control unit
N79	Right air mixture flap actuator
N82	Outside / recirculation air intake flap actuator
N83	Air distribution/defrost flap actuator
O30	Air fan adjustment resistance	-
O30	Passenger compartment air fan adjustment resistor	-
P60	Driver''s external rear view mirror	7005R 3363236

Location of components - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

AIR CONDITIONING - LOCATION OF COMPONENTS Fiat STILO 2.4 20v da 07/03 a 12/03

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Components - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

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	-
K87	Lower treated air sensor
K88	Upper treated air sensor
M1	Body computer
M70	Climate control system control unit
N79	Right air mixture flap actuator
N82	Outside / recirculation air intake flap actuator
N83	Air distribution/defrost flap actuator
O30	Air fan adjustment resistance	-
O30	Passenger compartment air fan adjustment resistor	-
P60	Driver''s external rear view mirror	7005R 3363236

Description - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

An automatic system manages the passenger compartment climate control, i.e. temperature and ventilation with recirculation and air flow orientation, with separate management of the temperature for the left and right hand sides of the passenger compartment.A dedicated control unit manages system operation by controlling:air temperature at the driver/passenger vent;air distribution to the vents;speed of the fan (varies continuously);activation of the compressor (air refrigeration circuit);activation of air recirculation;The MAX-DEF fast defrost function (i.e. a set of actions which allow both the windscreen and the rearscreen to be demisted quickly);The control unit sets the above parameters in order to adjust passenger compartment temperature to the required level. The system controls are located outside the control unit housing.The following parameters/functions can be modified manually:fan speeddistribution directioncompressor disablementdefrosting/demisting:recirculationManual selections always take precedence over automatic selections and are stored until the user deliberately cancels the command, allowing the automatic device to take control over the relevant function.The control unit downloads information on interior and exterior temperature and climatic conditions via special sensors.exterior temperature sensor, locate on the driver''s side door mirror. The sensor reading is downloaded by a control unit on the door and filtered as necessary; it is then sent via the CAN network to the climate control system ECU (to instrument panel and other appliances).lower mixed air temperature sensor (right and left);upper mixed air sensors (right and left);sunlight sensor, which measures the sun''s rays on the windscreen;exhaust gas presence sensor (A.Q.S.: Air Quality Sensor):supplies a signal when the air pollution index exceeds a preset level of harmfulness. This signal turns on the recirculation to prevent polluted air entering the passenger compartment;After processing the information, it adjusts passenger compartment air intake speed by means of the fan motor and air temperature by means of two mixer actuators (one for the right side and one for the left). it also sets flow distribution with another actuator and - lastly - interior air/exterior air recirculation via a final actuator.When required, the ECU automatically activates the cooling circuit and dehumidifies the air by operating the air conditioner compressor.

Description - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

On Diesel versions there is an additional electric heater which is switched on if the temperature of the coolant reaching the heater is low.

Description - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

For more details,.The climate control system ECU receives a signal from the body computer to indicate that the windscreen washer is on and activates the recirculation function to prevent the liquid detergent smell from entering the passenger compartment.The vehicle speed signal - received by the CAN network - is used to filter outdoor temperature and adjust ventilation and the dynamic air intake according to car speed.The body computer continually downloads a battery voltage signal for comparison with its limit value. If the recorded battery voltage is lower than the threshold, the computer cuts in via the CAN network to send a signal to disable a series of appliances: this includes the fan control.The climate control system control unit is supplied by two lines, one direct and one controlled by the ignition, protected by fuses in the underdashboard control unit. the fan is supplied by a line protected by a special fuse and by a specific relay in the engine compartment control unit.

Functional description - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

Climate control control unit M70 is supplied when the ignition is turned on (INT) at pin 1 of connector C from a line protected by fuse F49 of underfacia junction unit B2. it is supplied directly at pin 12 of connector C from a line protected by fuse F39 of underfacia control unit B2. Pin 6 of connector C of M70 is earthed.Control unit M70 is also connected to sensors K87 (right lower treated air - connector B - and left - connector A), K88 (right upper treated air - connector B - and left - connector A); these sensors receive a reference earth from pin 14 of connector A and send signals to pins 11, 1, 12 and 10 of M70.

Functional description - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

The frost sensor K86 receives a reference earthfrom pin 14 of connector A and sends a signal to pin 5 of connector A of M70 if the evaporator temperature is too low.

Functional description - AIR CONDITIONING - Fiat STILO 2.4 20v da 07/03 a 12/03

The solar ray sensor K90 informs the control unit of the solar radiation heat : it receives a 5V supply from pin 18 of control unit M70 and returns two signals: to pin 7 for the right area and to pin 6 for the left area.The exhaust gas presence sensor (A.Q.S.) K64 supplies a recirculation control signal when the air pollution exceeds pre-set levels: it is supplied at pin 1 from the line controlled by the ignition (INT/A) protected by fuse F31 of underfacia control unit B2 . pin 2 is earthed and pin 3 sends a signal to pin 10 of connector C of M70.The air conditioning system is equipped with one recirculation actuator ( N82 ), two air blending actuators (N78 and N79) and two air districution actuators ( N80 and N83 ).Recirculation actuator N82 is controlled by control unit M70, via pins 1 and 2 of connector B.The blend actuators N78 and N79 are operated by the control unit M70 by pins 9-11 and 3-4 of connector C, respectively, receiving the supply for controlling the potentiometer from pin 17 of connector A of M70, a reference earth from pin 14 of connector A of M70 and sending a feedback signal to pins 2 and 3 of connector A of M70.The distribution actuators N83 and N80 are operated by the control unit M70 by pins 12-10 and 5-6 of connector B, respectively, receive a supply for controlling the potentiometer from pin 17 of connector A of M70 , a reference earth from pin 14 of connector A of M70 and send a feedback signal to pins 12 and 13 of connector A of M70 .Fan N85 (with built-in electronic speed regulation circuit) is ignition-operated (INT) by a line protected by fuse F31 of underfacia control unit B2 and controlled by relay T8 and dedicated fuse F8 of engine bay control unit B1 -..it receives an input signal from the control unit controlling the various speeds from pin 11 of connector C of M70 and returns a feedback signal to pin 8 of connector A of M70Pin 4 of connector C of M70 controls engagement of the compressor.The outdoor temperature sensor is located on door mirror P60: the sensor is connected to the control unit on door M66 and thence, via the CAN network, to M70.Control unit M70 is connected via the CAN line, from pins 2 and 3 of connector C, to Body Computer M1 and the other nodes, which exchange the following signals:speedometer signalwindscreen washer activation signal for recirculation activationwindow and sun-roof closure controlbattery voltage signal