The supply for fan
N11
arrives directly
from the battery from the line for the maxifuse FAN 1 of
B99
:
the fan therefore works when it receives an earth command.
The specific relays
J30
and
J31
for
the cooling system have coils supplied by the direct line (EFI)
protected by fuse
F5
of the additional fuse box
B98A
.
They are energized by an earth signal coming
from the engine control unit
M10
.
If the engine coolant reaches a first temperature
level, the control unit
M10
sends an earth signal to the
fan 1st speed relay
J30
which energizes the coil. The relay
then sends an earth signal which, via the additional resistance
O10
, operates
the fan
N11
which rotates at the first (slow) speed.
If the engine coolant reaches a higher temperature,
the control unit
M10
sends an earth signal to the fan 2nd
speed relay
J31
which energizes the coil. The relay then
sends an earth signal directly to the fan
N11
which rotates
at the maximum speed.