Infiniti QX4 (R50). Manual — part 456
Fan Speed Control
NBHA0014S0804
Blower speed is automatically controlled based on temperature setting, ambient temperature, in-vehicle
temperature, intake temperature, amount of sunload and air mix door position.
With FAN switch set to “AUTO”, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
Intake Door Control
NBHA0014S0805
The intake doors are automatically controlled by: The temperature setting, ambient temperature, in-vehicle
temperature, intake temperature, amount of sunload and ON-OFF operation of the compressor.
Outlet Door Control
NBHA0014S0806
The outlet door is automatically controlled by: The temperature setting, ambient temperature, in-vehicle
temperature, intake temperature and amount of sunload.
Magnet Clutch Control
NBHA0014S0807
The ECM controls compressor operation using input signals from the throttle position sensor and auto ampli-
fier.
Self-diagnostic System
NBHA0014S0808
The self-diagnostic system is built into the auto amplifier (LCU) to quickly locate the cause of problems.
DESCRIPTION
Features (Cont’d)
HA-22
Overview of Control System
=NBHA0015
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:
RHA856H
Control Operation
NBHA0016
RHA452GA
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
DESCRIPTION
Overview of Control System
HA-23
RHA328HA
DISPLAY SCREEN
NBHA0016S01
Displays the operational status of the system.
AUTO SWITCH
NBHA0016S02
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
NBHA0016S03
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) WITHOUT NAVIGATION
SYSTEM
NBHA0016S04
Increases or decreases the set temperature.
OFF SWITCH
NBHA0016S05
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
NBHA0016S06
Manually controls 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
NBHA0016S07
OFF position: Outside air is drawn into the passenger compartment.
ON position: Interior air is recirculated inside the vehicle.
DEFROSTER (DEF) SWITCH
NBHA0016S08
Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position.
MODE SWITCH
NBHA0016S09
Controls the air discharge outlets.
TEMPERATURE DIAL (POTENTIO TEMPERATURE CONTROL) WITH NAVIGATION SYSTEM
NBHA0016S10
Increases or decreases the set temperature.
AMB (AMBIENT) SWITCH (WITH NAVIGATION SYSTEM)
NBHA0016S11
Shows the ambient (outside) air temperature on the display screen for 5 seconds.
DESCRIPTION
Control Operation (Cont’d)
HA-24
Discharge Air Flow
NBHA0017
RHA043G
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
DESCRIPTION
Discharge Air Flow
HA-25
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