Infiniti G20 (P11). Manual — part 422
Overview of Control System
=NCHA0015
The control system consists of input sensors, switches, the automatic amplifier (microcomputer) and outputs.
The relationship of these components is shown in the diagram below:
SHA170F
Control Operation
NCHA0016
RHA452G
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
DESCRIPTION
AUTO
Overview of Control System
HA-19
DISPLAY SCREEN
NCHA0016S01
Displays the operational status of the system.
AUTO SWITCH
NCHA0016S02
The compressor, intake doors, air mix door, outlet doors, and blower speed are automatically controlled so
that the in-vehicle temperature will reach, and be maintained at the set temperature selected by the operator.
ECON SWITCH
NCHA0016S03
By pressing the ECON switch, the display should indicate ECON and the compressor always turns OFF. With
the compressor OFF, the system will not remove heat (cool) or de-humidify. The system will maintain the in-
vehicle temperature at the set temperature when the set temperature is above the ambient (outside) tempera-
ture. The system will set the intake doors to the outside air position.
TEMPERATURE SWITCH (POTENTIO TEMPERATURE CONTROL)
NCHA0016S04
Increases or decreases the set temperature.
OFF SWITCH
NCHA0016S05
The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet
doors are set to the foot (80% foot and 20% defrost) position.
FAN SWITCH
NCHA0016S06
Manual control of the blower speed. Four speeds are available for manual control (as shown on the display
screen):
low
, medium low
, medium high
, high
RECIRCULATION (REC) SWITCH
NCHA0016S07
OFF position: Outside air is drawn into the passenger compartment.
ON position: Interior air is recirculated inside the vehicle.
DEFROSTER (DEF) SWITCH
NCHA0016S08
Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position.
MODE SWITCH
NCHA0016S09
Controls the air discharge outlets.
DESCRIPTION
AUTO
Control Operation (Cont’d)
HA-20
Discharge Air Flow
NCHA0017
RHA042H
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
DESCRIPTION
AUTO
Discharge Air Flow
HA-21
RHA044G
Position or
switch
MODE SW
DEF SW
AUTO
SW
ECON
SW
REC SW
Temperature SW
VENT
B/L
FOOT
D/F
ON
OFF
ON
OFF
Door
18.0°C
(65°F)
—
32.0°C
(85°F)
Ventilator
door
A
B
C
C
C
—
AUTO
AUTO
—
—
Foot door
A
B
D
C
A
—
—
Defroster
door
A
A
B
C
D
—
—
Air mix
door
—
—
—
A
AUTO
B
Intake door
—
C
A
AUTO*1
—
*1: Automatically controlled when REC switch is OFF.
DESCRIPTION
AUTO
Discharge Air Flow (Cont’d)
HA-22
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