In Car Controls; Temperature Demand Switch; Face Level Differential Controller - Aston Martin DB7 Workshop Manual

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Air Conditioning
In Car Controls
In Car Controls
Temperature Demand Switch
In-cartemperatu res are selected by the temperature
demand switch (Fig. 1).
Face Level Differential Controller
The face level differential control alters the
temperature of the air distributed through the face
level vents. The switch is coupled to a 10 K ohm
potentiometersupplied with+5 volts from pin 43 of
the control module (Fig. 3). Temperature, from the
face vents, is decreased by moving the switch anti-
clockwise and increased by moving it clockwise.
6.6 K
lOKQ
Linear
+ 5v
7 Temperature
Differential Signal
10CND
Figure 1.
The switch is coupled to a 590 ohm potentiometer
(Fig. 2) supplied with +5 volts from pin 43 of the
ECM. The output voltage is from zero to 2.885 volts
which represents a range of temperatures from 16
to 38°C. Rotation of the switch is restricted
mechanically to 180° of travel.
Figure 3.
590 Q
Linear
1 GND
.2 Temperature
Demand Signal
•3 +5v
410 Q
Figure 2.
May 1996
8-21