The relay
J35
controls the heater fan circuit.
The supply at the relay contact comes from
the battery through the line for the A/C maxifuse up to 2/99 or
of
B99
from 2/99, while the coil energizing is controlled
by the ignition (INT/A) from the line protected by fuse
B10
up
to 2/99 or fuse
F6
of the additional fuse box
B98B
from
2/99.
The relay
J35
supplies the control
knob
H81
: this controls the fan at the different speeds through
the regulator
O30
.
The voltage control system varies according
to the position of the knob and passes or does not pass through
the resistors of the regulator
O30
determining the four different
voltage signals for the fan
N85
which sends outside or recirculation
air to the duct/distributor unit at 4 different speeds.
The regulator
O30
has a thermal contact
which protects against dangerous overvoltages.
The intake of outside air is controlled
by the motor
N82
which operates the flap between the two
extreme positions of "dynamic air" and "recirculation".
The activation of the motor is controlled
by the button located in the controls
H80
: this switch receives
a supply controlled by the ignition (INT/A) from the line protected
by the fuse
B10
up to 2/99 or fuse
F6
of the additional
fuse box
B98B
from 2/99.
and is connected to earth: when the supply
and earth are reversed, the motor's direction of rotation is reversed.
With the recirculation switched on, the LED in the button for
H80
also
comes on.
The controls unit
H80
has ideograms
which are lit up when the side lights are on by means of the line
coming from the steering column switch unit
H5
protected
by fuse
B11
up to 2/99 or fuse
F4
of the additional
fuse box
B98B
from 2/99.