Workshop Manual

1A–84
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Mode (Blow Port) Control
The A/C control unit receives temperature setting data as
well as temperature and solar radiation level data from the
various sensors. Based on this data, the control unit
compiles a composite TMO signal. The TMO signal
allows the outlet positions to be changed in a set pattern
(VENT→BI-LEVEL→FOOT→DEFROST/FOOT).
The mode actuator acts in response to mode position. It
compares data signals received from the target mode, the
door position, and mode door position to determine the
direction of rotation.
If the temperature is set to 18°C (65°F), cool air is
discharged from the head outlets. If t he temperature is
set to 32°C (90°F), warm air is discharged from the foot
outlets.
In manual mode, existing air outlet settings remain
unchanged when the temperature is set to 18°C (65°F) or
32°C (90°F).
<Mode switch operation>
Press the mode switch to change to the outlet mode.
Blower operation (outlet mode position) can now be
switched between the VENT, BI-LEVEL, FOOT, and DEF
positions.
<Defroster switch operation>
The DEF position can be selected from the outlet mode.
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Intake (Fresh air/interior air switching)
Control
During automatic operation, the A/C control unit responds
to the temperature setting signal together with signals
from the various sensors to generate a general signal that
controls operation in a prescribed pattern.
If either or both the fan and the cooler are off, air intake is
from outside the vehicle.
If the temperature control switch is set to either 18°C
(65°F) or 32°C (90°F), the air inside the vehicle is
recirculated.
1. Manual switch operation
Press the intake switch to change between outside air
intake and recirculated inside air.
2. Defrost switch operation
Air intake is from outside the vehicle.
3. Mode switch operation
During automatic operation, outside air intake or
recirculated inside air is selected as appropriate.
During manual operation or when the DEF mode is
selected, air intake is from outside the vehicle.
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