Relays
J36
and
J37
control
the engagement of the resistors
O25
.
The power supply to heating coils
O25
arrives from the battery from the maxifuse HEAT line, located directly
on the battery A1 connector D.
The relay
J36 controls the engagement
of the first additional heater coil: the relay power supply is received
from shunt fuse B38A;
The climate control unit
M70 sends
the enabling signal for engaging the first resistance O25A from
pin 12 of connector A: this signal energizes relay J36.
The relay
J37 controls the engagement
of the other two additional heater coils. The relay power supply
is received from shunt fuse B38B
The control unit
M70 sends
a signal for enabling the engagement of the two resistances O25B
and O25C from pin 40 of connector A: this signal energizes the relay
J37.