3315602 - E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING - Functional description
Functional description
The heated rear window relay
J55
controls the simultaneous
switching on of the demisting function of the rear window
P55
,
the heated windscreen
P56
and the external rearview mirrors
P60
and
P61
.
(The control circuit of the heated rear
window
P55
passes through the power source/amplifier aerial
P25
-
See E3510 RADIO
)
The supply line to the latter is also protected
by the mirror demister fuse
B16
. The relay
J55
is
supplied by the direct line from the battery through the fuse
B33
.
An earth signal from the electronic Check
device
M45
- pin 10 of connector C - energizes the coil
of relay
J55
, so supply is sent to the resistors of
P55
,
P56
,
P60
and
P61
: this signal is enabled
and suitably time-lagged by the device
M45
.
An ignition-operated power supply (INT/A)
for the Check device
M45
reaches pin 9 of connector C through
fuse
F1
of junction unit
B1
: pin 7 of connector
C is earthed.
The device
M45
gives enablement
to the time-lagged switching on of the rear window when it receives
the command from the on/off button - pin 11 of connector A - and
at the same time the engine rpm signal is present - pin 8 of connector
B, coming from the instrument panel
E50
.
The enablement takes place when the engine
speed is above 1000 rpm.
The button which switches on the heated
rear window function is in the climate control panel
H80
:
the command is sent to the climate control unit
M70
- pin
13 of connector C - from pin 9 through the serial line.
The control unit
M70
is supplied
- to pin 11 of connector B - from the ignition-controlled line (INT/A)
of relay
R1
protected by fuse
F9
of junction unit
B1
:
pin 8 of connector C is earthed. From pin 9 of connector B of
M70
,
the command is sent to the Check device
M45
- pin 11 of
connector A.
With the function switched on, the Check
device
M45
sends back a signal - from pin 2 of connector
B - to illuminate the led which indicates that the function is on;
the signal reaches pin 11 of connector C of
M70
and from
there the controls
H80
.