3315730 - E6020 AIR CONDITIONING - Functional description

Functional description

Control unit M70 is supplied when the ignition is turned on (INT/A) at pin 11 of connector B from a line protected by fuse F9 from junction unit B1 .; The power supply comes directly from the battery to pin 10 of connector C through fuse F17 of junction unit B1 and a line protected by maxifuse CENTR of B5 . Pin 8 of connector C of M70 is earthed. The outdoor temperature sensor is located on the left door mirror P60 : the sensor is connected to pins 1 and 7 of connector A of M70 . Control unit M70 is also connected to sensors K87 (lower treated air), K88 (upper treated air) and K89 (passenger compartment air), which are connected to pins 3-5, 11-12 and 8-13 of connector A of M70 respectively. Sensor K89 is fitted with a fan motor so that the temperature reading is not affected by the motionless and thus warmer air inside the facia: the motor is connected to the control unit via pins 10 and 12 of connector B. Solar radiation sensor K90 is connected to pins 6 and 15 of connector A of M70 . The air conditioning system is equipped with three activators for recirculation ( N82 ), air mixing ( N81 ) and air distribution ( N80 ). Recirculation actuator N82 is controlled by control unit M70 , via pins 3 and 4 of connector B. The air mixing actuator N81 is controlled from pins 1 and 2 of connector B from control unit M70 ; it receives a supply for control by potentiometer from pin 20, the reference earth to pin 14 at connector A, and sends a feedback signal to pin 16 of connector A. The air distribution actuator N80 is connected from pins 7 and 8 of connector B from control unit M70 ; it receives a supply for control by potentiometer from pin 18, the reference earth at pin 2 of connector A, and sends a feedback signal to pin 17 of connector A. An electronic governor operates fan N85 at different speeds: this receives a control signal from control unit M70 - from pin 2 of connector C - and converts it to a variable voltage signal that controls the fan. Pin 1 of connector C provides a reference earth, pin 6 of connector C of M70 provides a speedometer signal. Fan unit N45 is supplied when the ignition is turned on (INT/A) via relay J35 and fuse B65 . Pin 4 of connector C of M70 receives a speedometer signal from instrument E50 . A heated back window activation control - from pin 9 of connector B - is sent to control unit M45 ( See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING . ) Pin 6 of connector B controls activation of the compressor (  See E6021  COMPRESSOR ENGAGEMENT ). Climate control unit H80 communicates with control unit M70 via a serial connection line: from pin 13 of connector C of M70 to pin 9 of H80 . The supply to the climate control unit H80 arrives directly from the battery. (maxifuse CENTR of B5 ) to pin 1, via fuse F18 of junction unit B1.

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