3315732 - E6020 AIR CONDITIONING - Functional description
Functional description
Climate control unit
M70 is supplied
when the ignition is turned on (INT/A) at pin 11 of connector B
by the line protected by fuse T25 of B45 controlled by the relay
T24 and protected by fuse F78 of B45.
The power supply comes directly from the
battery to pin 15 of connector C through fuse
F19 of junction
unit B2.
Pin 1 of connector C of
M70 is earthed.
The exterior temperature sensor is located
on 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) which are
connected to pins 3-5 and 11-12 of connector A of M70 respectively.
Sensor
K89 (passenger compartment air)
is fitted with a fan motor controlled by the ignition so that the
temperature reading is not affected by the motionless and thus warmer
air inside the dashboard.
the motor is connected to the control
unit, to pins 10 and 12 of connector B; the actual sensor is connected
to the control unit at pins 13 and 8 of connector A.
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.
Recirculation actuator
N82 is controlled
by control unit M70, via pins 1 and 2 of connector B.
Actuator
N81 receives a power supply
at pins 5 and 3 and a control potentiometer earth signal via pins
20 and 14 connector A of control unit M70 which receives the feed-back signal
at pin 16 of connector A.
Distribution actuator
N80
is controlled
from control unit
M70
via pins 7 and 8 of connector B.
Actuator
N80 receives power at pins 6
and 4 and an earth signal for the control potentiometer via pins
18 and 2 of connector A of control unit M70 which receives the feed-back signal
at pin 17 of connector A.
Fan
N85
is operated at different
speeds by its internal governor; it receives input control signals
from control unit
M70 from pins 3, 7 and 8 of connector C and
transforms them into signals for the operation of the fan.
The fan unit
N85 is supplied by the line
protected by fuse F8 via the contact for relay T8 of the engine
compartment junction unit B1.
Pin 5 of connector B of
M70 receives
a speedometer signal from instrument E50.
A heated rear window activation command
is transmitted by control unit
M70 from pin 9 of connector B
whilst pin 11 of connector C receives the on signal for the relevant
LED. 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 12
of connector C of M70 to pin 5 of H80 via junction D90.
Climate control unit
H80 is also connected
from pin 6 to ICS display E60 (pin 15 connector B) via a special
serial connection line.
The control unit
M70 is equipped with
a self-diagnostic unit that may be used by connecting the unit to
connector R10 pin 9;
it receives signals from pin 12 of connector C
of
M70 via the serial connection line between control unit M70
and climate control system unit H80 and from there is connected
to the ICS display E60. See E8010 DIAGNOSTIC MULTIPLE CONNECTOR