2429921 - E6020 AIR CONDITIONING - Functional description (Two-zone climate control system)

Functional description

Climate control control unit M70 is supplied when the ignition is turned on (INT) at pin 39 by the line protected by fuse F49 of underfacia junction unit B2. ; it is supplied directly at pin 30 from a line protected by fuse F39 of underfacia control unit B2. Pin 40 of M70 is earthed. Sensors K111 (right lower treated air) and K113 (left lower treated air), K110 (right upper treated air) and K112 (left upper treated air) are connected to control unit M70: these sensors receive a reference earth from pin 11 and send signals to pins 20, 17, 9 and 18 of M70. The frost sensor K86 receives a reference earth from pin 11 and sends a signal to pin 8 of M70 if the evaporator temperature is too low. The solar ray sensor K90 informs the control unit of the heat coming from rays: it receives a 5V supply from pin 7 control unit M70 and gives out two signals: to pin 19 for the right area and to pin 10 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 6 of M70. The demisting sensor K125 (located in the same unit as the rain sensor See E3020 WINDSCREEN WASH/WIPE and the dusk sensor See E2010 SIDE LIGHTS / NO. PLATE LIGHTS ), receives an ignition-operated supply (INT) from the line protected by fuse F49 of the junction unit under the dashboard B2. ; and sends a signal to pin 16 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 ). The recirculation actuator N82 is operated by the control unit M70 from pins 12 and 22. The blend actuators N78 and N79 are operated by the control unit M70 by pins 32-37 and 35-24, respectively, receiving the supply for controlling the potentiometer from pin 31 of M70, a reference earth from pin 11 of M70 and sending a feedback signal to pins 25 and 26 of M70. The distribution actuators N83 and N80 are operated by the control unit M70 by pins 33-34 and 36-38, respectively, receive a supply for controlling the potentiometer from pin 31of M70, a reference earth from pin 11 of M70 and send a feedback signal to pins 27 and 28 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 F8 and dedicated fuse F8 of engine compartment junction unit B1 - it receives an input signal from the control unit controlling the various speeds from pin 5 of M70 and returns a feedback signal to pin 29 of M70 Pin 21 of M70 controls activation 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 1 and 2 to Body Computer M1 and the other nodes, which exchange the following signals:

• speedometer signal;
• windscreen washer activation signal for recirculation activation;
• battery voltage signal