2401168 - 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.
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.
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/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.
Pin 21 of
M70 controls activation of
the compressor
See
E6021
COMPRESSOR ENGAGEMENT
.
The heated rear windscreen controls are
connected to pins 4 and 13 of
M70
See
E3030
HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING
.
The controls for the hazard warning lights
are connected to pins 15 and 14 of
M70
See
E2020
DIRECTION INDICATORS / HAZARD WARNING LIGHTS
.