AIR CONDITIONER - FUNCTIONAL DESCRIPTION

Manual Air Conditioning

FUNCTIONAL DESCRIPTION

The climate control system control unit M70 receives a direct supply at pin 2 from the line protected by fuse F39 of the junction unit under the dashboard B2.

Pin 1 of M70 is earthed.

The control unit M70 is connected, via the CAN line, from pins 12 and 13 to the Body Computer M1 and to the other nodes.

See E1050 CAN CONNECTION LINES

The recirculation actuator N82 is operated by the control unit M70 from pins 14, 15, 16 and 17.

The mixture actuator N81 is operated by the control unit M70 from pins 24, 25, 26 and 27.

The distribution actuator N80 is operated by the control unit M70 from pins 19, 20, 21 and 22.

The fan N85 receives a power supply from the specific fuse F2 in the engine compartment junction unit B1 and receives an (earth) at the different speeds via the governor O30: the command signal varies according to the position of the control knob H81 and the governor O30 resistances determine four different voltage signals for the fan N85 which turns at 4 different speeds.

The control knob H81 is operated by the control unit M70 - pin 10 - via relay J35.

Pin 11 of M70 controls the engagement of the compressor.

See E6021 COMPRESSOR ENGAGEMENT - DESCRIPTION

Pins 9 and 8 regulate the additional heater resistances.

See E6015 ADDITIONAL HEATER

Automatic Air Conditioning

FUNCTIONAL DESCRIPTION

The climate control system control unit M70 receives a direct supply at pin 2 from the line protected by fuse F39 of the junction unit under the dashboard B2.

Pin 1 of M70 is earthed.

The treated air sensor K88 receives a reference earth from pin 5 and sends a signal proportional to the temperature measured at pin 13 of M70.

The solar sensor K90 informs the control unit of the heat coming from the sun''s rays: it receives a 5V power supply from pin 6 of control unit M70 and gives out two signals: to pin 24 for the right area, to pin 22 for the left area.

The exhaust gas presence sensor (A.Q.S.) K64 provides a recirculation control signal when the air pollution index exceeds the pre-set harmful levels: it receives a power supply at pin 2 from the ignition-controlled line (INT) protected by fuse F35 of the junction unit under the dashboard B2; pin 1 is earthed and pin 3 sends a signal to pin 19 of M70.

The mist sensor is located in the mirror P65; the sensor receives a power supply from the INT line protected by fuse F49 of junction unit B2 and sends a signal - pin 4 of P65 - to pin 20 of M70.

The sensor which measures the outside temperature is located on the door mirror P60: the sensor is connected to the control unit on the door M66 and from there, via the CAN, to M70.

Control unit M70 is connected, via the CAN line, from pins10 and 11 to the Body Computer M1 and to the other nodes exchanging the following signals:

- speedometer signal;

- windscreen washer engagement signal for activating recirculation;

- outside temperature signal;

- battery voltage signal.

See E1050 CAN CONNECTION LINES

The actuators are operated by the electronic control unit by means of a BUS communication line: pin 3 of M70 provides the power supply, whilst the BUS communication line that is connected to the three mixture actuators N78, N79 and N115, to the three distribution actuators N112, N113 and N114 and to the recirculation actuator N82 leaves from pin 8 of M70.

On the "triple zone" version the same BUS line is also connected to the rear controls H120.

On the "dual zone" version, in addition to the controls H120, there are no actuators for the rear zone N114 and N115.

The fan N85 receives a power supply from the specific fuse F2 in the engine compartment junction unit and receives an (earth) command for the different speeds from the electronic governor M72: the latter receives a power supply from pin 4 of control unit M70 and a PWM regulation signal from pin 17 and sends a feedback signal to pin 26 of M70.

Pin 15 of M70 controls the engagement of the compressor.

See E6021 COMPRESSOR ENGAGEMENT - DESCRIPTION

Pins 9 and 10 regulate the additional heater resistances.

See E6015 ADDITIONAL HEATER