192004761 - E6020 AIR CONDITIONING - FUNCTIONAL DESCRIPTION (Webasto)
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.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.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 M70Pin 4 of connector C of M70 controls engagement of the compressor. See E6021 COMPRESSOR ENGAGEMENTThe 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