3239321 - E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING - Functional description (Air Conditioner, Heater, Sedan)
Functional description
The heated rear windscreen relay
R3
, located in the junction
unit
B1
, controls the simultaneous activation of the demisting
of both the rear windscreen
P55
and the external rear view
mirrors
P60
and
P61
.
The relay
R3
is supplied by the direct
line from the battery through the fuse
F11
- always for
B1
-
and the maxifuse
J/B1
of
B5
up to 2/99 or of
B99
from
2/99.
The supply for the coil for relay
R2
is
controlled by the ignition. (INT/A) of line protected by fuse
B10
up
to 2/99 or fuse
F6
of the additional fuse box
B98B
from
2/99.
An earth signal coming from the integrated
services control unit
M40
(pin 9 of connector B) energizes
the coil of the relay
R1
, with the supply consequently sent
to resistors
P55
,
P60
and
P61
. (the control
circuit of the heated rear window
P55
passes through the
aerial
P22
control unit. (
See E3510 RADIO
)
The control unit
M40
is supplied
when the ignition (INT) is switched on from the line for fuse
F1
of
the junction unit
B1
(pin 7 of connector B).
Functional description
At the same time as the activation
of the resistors, a signal is sent (from pin 11, of connector B
of
M40
) to light up the LED in the control button which is located
in the climate control unit
M70
.
Functional description
When an earth command is received (pin 14
of connector B) coming from the heater H80 (heated rear windscreen
on button pressed), according to the control logic described previously,
a command is sent which energizes the coil of the relay
R1
.
(pin 9 of connector B). At the same time as the activation of the
resistors, a signal is sent (from pin 11, of connector B of
M40
)
to light up the LED in the control button which is located in
H80
.