The relay T8 of the engine compartment junction
unit
B1
controls the circuit for engaging the first resistance
for the additional heater.
The relay supply arrives from the line of
maxifuse CVM located on the battery, connector
B99
, via
the line of special fuse F8 of engine bay control unit
B1
.
The supply for the coil for relay T8 arrives
from the line controlled by the ignition (INT/A) protected by fuse
F31 of the junction unit under the dashboard
B2
.
The climate control unit
M70 sends the
enabling signal for engaging the first resistance O25A from pin
8: this signal energizes relay T8 of control unit B1.
The relay
J36
controls the engagement
of the other two resistances for the additional heater.
The supply for relay arrives from the line
for maxifuse PTC2, located on the battery, connector
B99
.
The climate control unit
M70 sends a
signal for enabling the engagement of the two resistances O25B and
O25C from pin 9: this signal energizes the relay J36.