Fiat 1996 Brava Service Manual page 579

Auxiliary units
Climate control
Bravo-Brava
98 range
50.
1
R1 R2 R3 R4 R5 R6 R7
Wiring diagram
(-)
(+)
for
in
1 2 3 4 5 6
□ C3 □ O □ □
7 8 9 X) 11 12
□ D a □ n □
P4A08CH02
7. Recirculation function switch
2. Compressor enablement switch
3. Passenger compartment temperature
sensor
Terminal
1
2
3
4
5
6
FUNCTION
Motor for ventilated sensor (+)
Motor for ventilated sensor (-)
Earth for passenger compartment temperature sensor
Signal for passenger compartment temperature sensor
MAX-DEF
N.C.
Requested air flow rate potentiometer
This potentiometer is connected to the air
ventilation knob and detects the various an­
gular positions, sending a signal to the elec­
tronic control unit: there are.four possible air
flow rates which are set manually ( 1 , 2, 3 e
4), plus an "AUTO" position and "0".
It receives a 5V supply from the control unit
and has a controlled earth and gives off a sig­
nal corresponding to the position of the
knob:
Rl-R7=1500Ohm±l%
Recirculation function switch
Pressing this switch engages the recircula­
tion function which is managed completely
manually:
Compressor enablement switch (air refrig­
eration circuit)
Pressing this switch enables the operation of
the compressor (air refrigeration circuit).
Passenger compartment temperature sen­
sor
This is located in the climate control control
panel between the recirculation and com­
pressor switches.
It consists of an NTC sensor (R at 25°C = 2.2
kOhm), with an operating range of between
+5°C and + 4 5 X . The sensor is "ventilatat-
ed", in other words it incorporates a small fan
which is always supplied so that the temper­
ature reading is not affected by stagnant air
inside the dashboard giving a misleading pic­
ture.
These last three components make up a sin­
gle element which is connected by a single
connector.
Terminal
7
8
9
10
11
12
FUNCTION
Compressor operation
Warning lights operation (NC)
+ 15
Ideogram lights ( + )
Ideogram lights (-)
Recirculation control
8
Print no. 506.670/16