Nissan Pathfinder. Manual — part 690
SYSTEM
HAC-21
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
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HAC
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• When front blower motor is activated, A/C auto amp. gradually
increases duty ratio of front blower motor control signal to prevent
a sudden increase in discharge air flow.
• It takes approximately 8 seconds for air flow to reach HI from LOW.
LOW COOLANT TEMPERATURE STARTING CONTROL
If the engine coolant temperature is 56
°C (133°F) or less, to prevent
a cold discharged air flow, A/C auto amp. suspends front blower
motor activation for the maximum 150 seconds depending on target
air mix door (front) opening angle. After this, front blower motor con-
trol signal is increased gradually, and front blower motor is activated.
HIGH IN-VEHICLE TEMPERATURE STARTING CONTROL
When front evaporator fin temperature is high [intake sensor value is 35
°C (95°F) or more], to prevent a hot
discharged air flow, A/C auto amp. suspends front blower motor activation for approximately 3 seconds so that
front evaporator is cooled by refrigerant.
FAN SPEED CONTROL AT DOOR MOTOR OPERATION
When mode door motor (front) is activated while air flow is more than the specified value, A/C auto amp.
reduces fan speed temporarily so that mode door (front) moves smoothly.
FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Air Inlet Control
INFOID:0000000009176785
The intake door is automatically controlled by the temperature set-
ting, ambient temperature, in-vehicle temperature, intake tempera-
ture, amount of sunload and ON/OFF operation of the compressor.
Intake door automatic control selects FRE, 20% FRE, or REC
depending on a target air mix door (front) opening angle, based on
in-vehicle temperature, ambient temperature, and sunload.
FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Air Outlet Control
INFOID:0000000009176786
• While air outlet is in automatic control, A/C auto amp. selects the
mode door (front) position depending on a target air mix door
(front) angle and outlet air temperature calculated from sunload.
• If ambient temperature is excessively low, D/F is selected to pre-
vent windshield fogging when air outlet is set to FOOT.
JMIIA0736GB
JMIIA0737GB
JMIIA0732GB
JMIIA0730GB
HAC-22
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
SYSTEM
FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control
INFOID:0000000009176787
DESCRIPTION
• When the compressor activation condition is satisfied while blower motor is activated, A/C auto amp. trans-
mits A/C ON signal and blower fan ON signal to ECM via CAN communication.
• ECM judges that the compressor can be activated depending on each sensors state (refrigerant pressure
sensor signal and others) and transmits A/C compressor request signal to IPDM E/R via CAN communica-
tion.
• IPDM E/R turns A/C relay ON and activates the compressor depending on request from ECM.
COMPRESSOR PROTECTION CONTROL AT PRESSURE MALFUNCTION
When high-pressure side value that is detected by refrigerant pressure sensor is as per the following state,
ECM requests IPDM E/R to turn A/C relay OFF and stops the compressor.
• 3.12 MPa (31.82 kg/cm
2
, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
• 2.74 MPa (27.95 kg/cm
2
, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
• 0.14 MPa (1.43 kg/cm
2
, 20.3 psi) or less
COMPRESSOR OIL CIRCULATION CONTROL
When the engine starts while the engine coolant temperature is 56
°C (133°F) or less, ECM activates the com-
pressor for approximately 6 seconds and circulates the compressor lubricant once.
LOW TEMPERATURE PROTECTION CONTROL
• When intake sensor detects that front evaporator fin temperature is
2.5
°C (37°F) or less, A/C auto amp. requests ECM to turn com-
pressor OFF, and stops the compressor.
• When the front evaporator fin temperature returns to 5.0
°C (41°F)
or more, the compressor is activated.
OPERATING RATE CONTROL
When set temperature is other than fully cold or air outlet is “VENT”, “B/L” or “FOOT” A/C auto amp. controls
the compressor activation depending on ambient temperature.
AIR CONDITIONING CUT CONTROL
When set engine is running is excessively high load condition, ECM requests IPDM E/R to turn A/C relay OFF,
and stops the compressor. Refer to
EC-36, "AIR CONDITIONING CUT CONTROL : System Description"
for
details.
JMIIA0742GB
SYSTEM
HAC-23
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
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FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Door Control
INFOID:0000000009176788
DOOR MOTOR CONTROL
• LCU (Local Control Unit) is built into each door motor, and detects door position by PBR (Potentio Balance
Resistor).
• A/C auto amp. communicates with each LCU via communication line and receives each door position feed-
back signal from each LCU.
• Each LCU controls each door to the appropriate position depending on the control signal from A/C auto amp.
• Each LCU transmits the signal of door movement completion to A/C auto amp., when the door movement is
completed.
SWITCH AND THEIR CONTROL FUNCTION
ALIIA0580GB
JMIIA1778ZZ
HAC-24
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
SYSTEM
*: Inlet status is displayed by indicator during activating automatic control
AIR DISTRIBUTION
1.
Intake door
2.
Front blower motor
3.
In-cabin microfilter
4.
Front evaporator
5.
Air mix door (front)
6.
Front heater core
7.
Foot door
8.
Ventilator door
9.
Defroster door
10. Max. cool door
Fresh air
Recirculation air
Discharge air
Defroster
Center ventilator
Side ventilator
Front foot
Rear foot
Switch position
Door position
Mode door (front)
In
ta
ke
do
or
Air mix door (front)
V
e
nti
lat
or d
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r
Ma
x.
co
ol
do
or
De
fr
os
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r do
or
Fo
ot
do
or
(Driver side)
(P
as
se
ng
er s
id
e)
AUTO switch
AUTO
MODE switch
A
A
A
A
—
—
—
B
B
A
B
C
C
B
B
C
B
B
B
DEF switch
C
A
C
C
Intake switch
*
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—
—
—
A
B
Temperature control
switch (Driver side)
DUAL
switch:
OFF
Full cold
[18
°C (60°F)]
—
A
18.5
°C – 31.5°C
(61
°F – 89 °F)
AUTO
Full hot
[32
°C (90°F)]
B
Temperature control
switch (Driver side)
DUAL
switch:
ON
Full cold
[18
°C (60°F)]
A
—
18.5
°C – 31.5°C
(61
°F – 89 °F)
AUTO
Full hot
[32
°C (90°F)]
B
Temperature control
switch (Passenger
side)
Full cold
[18
°C (60°F)]
—
A
18.5
°C – 31.5°C
(61
°F – 89 °F)
AUTO
Full hot
[32
°C (90°F)]
B
ON·OFF switch
OFF
C
C
B
B
B
—
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