Fiat Bravo Service Manual page 599

Auxiliary units
Additional heater
50.
The second piece of information is the electrical power available and is obtained from the battery voltage
value; of the voltage is above 12.8 V, the operation of the heater plugs is enabled, below this figure one,
t w o or all three heater plugs are gradually deactivated.
This parameter is checked every 10 seconds in order to keep the power absorbed constantly under c o n -
trol so that the battery is not run down.
The information concerning the engine speed is used to prevent the operation of the heater plugs w i t h
the engine switched off, the enabling takes place at around 660 rpm.
The supply of one, t w o or three heater plugs is operated by t w o relays:
1 st level is activated by the first relay.
2nd level is activated by the second relay.
3rd level is activated by both relays.
There is a third relay/remote control safety switch which interrupts the supply for the heater plugs if the
earth contact is not correct; the metal device containing the heater plugs is, in effect, connected to the
engine earth by means of a special cable loom; if this connection is interrupted, the relay stops the cur-
rent supply to the heater plugs.
28 XI-98 - Update
Bravo-Brava ^fy™
98 range
Print no. 506.670/17