Nissan Titan. Manual — part 377
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-13
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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AUTOMATIC AIR CONDITIONER SYSTEM
Control System Diagram
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CONTROL SYSTEM
The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.
The relationship of these components is shown in the figure below:
Control System Description
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CONTROL OPERATION
AWIIA0356GB
HAC-14
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
AUTOMATIC AIR CONDITIONER SYSTEM
Front air control
AUTO SWITCH
• The compressor, intake door, air mix doors, 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.
• When pressing AUTO switch, air inlet, air outlet, blower speed, and discharge air temperature are automati-
cally controlled.
TEMPERATURE CONTROL DIAL (DRIVER)
Increases or decreases the set temperature.
TEMPERATURE CONTROL DIAL (PASSENGER)
Increases or decreases the set temperature.
RECIRCULATION (
) SWITCH
• When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.
• When REC switch is turned OFF, or when compressor is turned from ON to OFF, REC switch is automati-
cally turned OFF. REC mode can be re-entered by pressing REC switch again.
• REC switch is not operated when DEF switch is turned ON, at the D/F position, or in floor position.
DEFROSTER (
) SWITCH
Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position,
and turns A/C compressor ON.
REAR WINDOW DEFOGGER SWITCH (CREW CAB)
When switch is ON, rear window and door mirrors are defogged.
OFF SWITCH
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 (75% foot and 25% defrost) position.
BLOWER CONTROL DIAL
The blower speed is manually controlled with this dial.
A/C SWITCH
The compressor is ON or OFF.
(Pressing the A/C switch when the AUTO switch is ON will turn off the A/C switch and compressor.)
MODE SWITCHES
Controls the air discharge outlets.
DUAL SWITCH
• When the DUAL switch indicator is illuminated, the driver and passenger temperature can each be set inde-
pendently.
• When the DUAL switch indicator is not illuminated, the driver temperature setting is applied to both sides.
AWIIA0937ZZ
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-15
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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MAGNET CLUTCH CONTROL
When A/C switch or DEF switch is pressed, front air control inputs compressor ON signal to BCM.
BCM sends compressor ON signal to ECM and front air control, via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sen-
sor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON sig-
nal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
Discharge Air Flow
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WJIA2197E
Mode door position
Air outlet/distribution
Vent
Foot
Defroster
95%
5%
—
60%
40%
—
—
70%
30%
—
60%
40%
—
10%
90%
WJIA0540E
HAC-16
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
AUTOMATIC AIR CONDITIONER SYSTEM
Switches And Their Control Function
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AWIIA0572GB
AWIIA0359GB
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