Subaru SVX 1992 Manual page 952

4-7 [M4071 AUTOMATIC AIR CONDITIONING SYSTEM
7. AUTO A/C CONTROL UNIT
The auto A/C control unit is composed of a control
panel and auto amplifier .
P\ ni~,&
\ ,
------- Auto A/C
_ -
control unit
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f J ! / C4-398
I J
Fig. 37
1) Control panel
The control panel is composed of push-button type
switches and a display . An electric signal is sent from an
operated switch to the auto amplifier, which is indicated
by the switch LED illuminating .
S i h O i
Illumination
w tc perat on
OFF ON
AUTO, ECON, DEF,
OFF - Green
VENT, LO, HI, CIRC
ON Amber Amber
I OFF, OUT . TEMP - - Green
2) Auto amplifier
The auto amplifier performs computation based on the
signals sent from each switch, sensor and engine con-
trol unit. It compares the computed results and P .B.R .
signal, and issues signals to the door motor, fan control
amplifier, and compressor solenoid actuator . This
method automatically controls the air outlet position, air
suction position, air outlet temperature, outlet air quan-
tity and compressor delivery.
In addition, the self-diagnosis function is provided for
facilitating trouble diagnosis .
P.B .R . (Potentiometric balance resistor) is a variable
resistor which converts air mix door and mode door
opening to a voltage.
rig. as
8. IN-VEHICLE SENSOR
This sensor is installed on the left side of the control
panel. It detects the temperature of interior air drawn in
by the aspirator and converts the temperature into a
resistance value which is then sent to the auto amplifier .
In-Vehicle
sensor
C4-400
Fig. 39
rig. 4u
18