AIR CONDITIONER - FUNCTIONAL DESCRIPTION

1.2 8v, 1.3 Multijet, 1.4 16v · Manual air conditioning

FUNCTIONAL DESCRIPTION

The passenger compartment air fan N085 receives a power supply along the line operated by relay T08 and protected by fuse F08 both located in the engine compartment junction unit B001 (pin 63 of connector B).

The coil for relay T08 of B001 (pin 45 of connector B) receives an ignition-controlled power supply (INT/A) along the line protected by fuse F31 of the Body Computer M001 (pin 21 of connector C). This line is excluded during engine starting.

The speed of fan N085 is regulated through the H080 fan control which, via the O030 regulating resistance, allows the fan motor to be connected to earth through different resistance values, thereby regulating the speed.

If the ring nut is pressed with the selector set to at least the first speed, the climate control system H080 (pin 2 of connector B) sends the compressor engagement request to the electronic thermostat N086.

Depending on the temperature measured by the sensor on the evaporator, N086 enables the engagement of the compressor by means of a positive signal sent to pin 49 of connector B of the Body Computer M001.

See E6021 COMPRESSOR ENGAGEMENT

The LED in the ring nut signals that the compressor has been switched on.

Switching the side lights on (pin 51 of connector D of M001) turns the two air conditioning/heater control lights on G045 A and B by means of a dedicated positive signal supplied by pin 12 of connector B of the Body Computer.

See E2010 SIDE LIGHTS / NO. PLATE LIGHTS

1.2 8v, 1.3 Multijet, 1.4 16v · Automatic climate control

FUNCTIONAL DESCRIPTION

The climate control system control unit M070 receives an ignition-controlled power supply (INT) at pin 2 of connector A along the line protected by fuse F51 of the Body Computer M001 (pin 24 of connector C) and a direct supply from the battery at pin 1 of connector A along the line protected by fuse F36 of the actual Body Computer (pin 29 of connector C). Pin 3 of connector A is earthed.

The passenger compartment air fan N085 receives a power supply from the line operated by relay T08 and protected by fuse F08 both located in the engine compartment junction unit B001 (pin 63 of connector B).

The coil for relay T08 of B001 (pin 45 of connector B) receives an ignition-controlled supply (INT/A) along the line protected by fuse F31 of the Body Computer M001 (pin 21 of connector C). This line is excluded during engine starting.

The climate control system control unit M070 is connected, via pins 8 (control) and 7 (feedback) to the passenger compartment air fan N085 to regulate the speed. The latter is also connected to the air conditioning system earth C016.

The climate control system control unit M070 is connected to different sensors; specifically:

• from pin 5 of connector A it provides a reference earth for the frost sensor K086, for the lower mixed air temperature sensor K087 and the upper one K088 and for the potentiometers incorporated in the air distribution flap actuator N080 and the air mixture flap actuator N081 (pin 1);
• at pin 6 of connector A it receives the signal supplied by the frost sensor K086;
• at pin 11 of connector A it receives the signal supplied by the lower mixed air temperature sensor K087;
• at pin 12 of connector A it receives the signal supplied by the lower mixed air temperature sensor K088;
• from pin 2 of connector B it provides a power supply for the potentiometers incorporated in the air distribution flap actuator N080 and the air mixture flap actuator N081 (pin 3);
• at pin 7 of connector B it receives the feedback signal from the air distribution flap actuator N080 (pin 2);
• at pin 2 of connector B it receives the feedback signal from the air mixture flap actuator N081 (pin 2);

The climate control unit M070 then manages the mixing, distribution and recirculation of the air, constantly checking the temperature. Specifically:

• from pins 5 and 6 of connector B it provides a power supply and reference earth respectively for the outside/recirculation air flap actuator N082;
• from pins 9 and 10 of connector B it provides a power supply and reference earth for the air mixture flap actuator N081;
• from pins 11 and 12 of connector B it provides a power supply and reference earth for the air distribution flap actuator N080.

The outside temperature sensor, incorporated in the passenger side exterior rear view mirror P061, receives an earth from the Body Computer M001 and sends a signal to pin 37 of connector B of the Body Computer; the latter forwards this signal via the B-CAN (pins 57 and 58 of connector B) to the climate control system control unit M070 (pins 10 and 9 of connector A) and to the other network nodes.

See E1050 CAN CONNECTION LINES

The control unit M070 sends the request for switching the compressor on to the engine management control unit M010 via the CAN.

See E6021 COMPRESSOR ENGAGEMENT

The discreet connection for switching the compressor on, in the climate control system control unit logic (pin 8 of connector A) has been omitted (not connected) in the vehicle connections because it is redundant in relation to the connection via the CAN.

Turning the side lights on (pin 51 of connector D of M001) causes the activation of the lighting for the climate control system control unit M070 managed via the CAN.

See E2010 SIDE LIGHTS / NO. PLATE LIGHTS