184002297 - E6020 AIR CONDITIONING - FUNCTIONAL DESCRIPTION (Dual-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.The control unit M70 is connected, via the CAN line, from pins 1 and 2 to the Body Computer M1 and to other nodes.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. 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 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. Fan N85 (with built-in electronic speed regulation circuit) is ignition-operated (INT/A) by a line protected by fuse F31 of underfacia control unit B2 and controlled by relay T8 and dedicated fuse F8 of engine compartment junction unit B1.It receives an input control signal for the various speeds from the controlunit from pin 5 of M70 and returns a feedback signal to pin 29 of M70.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. The heated rear windscreen controls are connected to pins 4 and 13 of M70 .