AIR CONDITIONING - Functional description

Functional description

Fan N85 is supplied when the ignition is switched on (INT/A) from the line protected by fuse F31 of the junction unit B2 under the facia and controlled by dedicated fuse F8 of engine bay control unit B1.

Control knob H81 controls the fan at different speeds via regulator O30: the control signal - earth signal - varies according to knob position and crosses or does not cross the coils of regulator O30 to determine four different voltage signals for fan N85, which thus turns at 4 different speeds.

The fan N85 operates at the first speed if the button for engaging the compressor is pressed, even if the control knob H81 is in position '0'. See E6021 COMPRESSOR ENGAGEMENT

The outside/recirculation air intake flap motor N82 is operated by a special button, located in the control panel H80: the operation of the button sends an earth signal and a supply controlled by the ignition (INT/A) protected by fuse B49 of underfacia control unit B2 which are reversed to reverse the direction of rotation of the motor.

Automatic Air Conditioning

Functional description

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.

1.2 16v · Automatic Air Conditioning

Functional description

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.

Automatic Air Conditioning

Functional description

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 M70

Pin 4 of connector C of M70 controls engagement of the compressor.See E6021 COMPRESSOR ENGAGEMENT

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 signal
• windscreen washer activation signal for recirculation activation
• window and sun-roof closure control
• battery voltage signal