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Nissan Pathfinder (2012 year). Manual - part 411

HAC-10

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

A/C Auto amp. M49, M50

In-vehicle sensor M32

Intake sensor M146

Intake door motor M58

Variable blower control (front)
M122

Air mix door motor (driver) M147

Mode door motor (front) M142

Air mix door motor (passenger)
M143

Optical sensor M145

⇐

:Front

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2012 Pathfinder

FUNCTION INFORMATION

HAC-11

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

REAR PASSENGER COMPARTMENT

Symptom Table

INFOID:0000000007356337

Rear air control (front) R2

Rear air control (rear) M208

Rear blower motor B501

Variable blower control (rear) B133

Air mix door motor (rear) B155

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Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-90

A/C system display is malfunctioning (with
NAVI).

Go to Navigation System.

AV-335

A/C system display is malfunctioning (without
NAVI).

Go to Mid-level Audio System.

AV-163

A/C system cannot be controlled.

Go to Self-diagnosis Function.

HAC-24

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

HAC-27

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

HAC-31

Air mix door motor is malfunctioning.

August 2012

2012 Pathfinder

HAC-12

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

HAC-39

Intake door motor is malfunctioning.

Front blower motor operation is malfunction-
ing.

Go to Trouble Diagnosis Procedure for Front Blower Motor.

HAC-42

Rear blower motor operation is malfunction-
ing.

Go to Trouble Diagnosis Procedure for Rear Blower Motor.

HAC-48

Rear discharge air temperature and/or air
outlet does not change.

Go to Trouble Diagnosis Procedure for Rear Air Control circuit.

HAC-57

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-69

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-112

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-120

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-122

Self-diagnosis cannot be performed.

Go to Trouble Diagnosis Procedure for Self-diagnosis.

HAC-90

Memory function does not operate.

Go to Trouble Diagnosis Procedure for Memory Function.

HAC-124

Symptom

Reference Page

August 2012

2012 Pathfinder

REFRIGERATION SYSTEM

HAC-13

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

REFRIGERATION SYSTEM

Refrigerant Cycle

INFOID:0000000007356338

REFRIGERANT FLOW

The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,

through the front and rear evaporators, and back to the compressor. The refrigerant evaporation through the

evaporator coils are controlled by front and rear externally equalized expansion valves, located inside the front

and rear evaporator cases.

FREEZE PROTECTION

The compressor cycles on and off to maintain the evaporator temperature within a specified range. When the

evaporator coil temperature falls below a specified point, the intake sensor interrupts the compressor opera-

tion. When the evaporator coil temperature rises above the specification, the intake sensor allows compressor

operation.

Refrigerant System Protection

INFOID:0000000007356339

REFRIGERANT PRESSURE SENSOR

WJIA1342E

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HAC-14

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

REFRIGERATION SYSTEM

The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-

sor, located on the condenser. If the system pressure rises above or falls below the specifications, the refriger-

ant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM.

The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high
pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm

, 398 psi), or below

about 120 kPa (1.22 kg/cm

, 17.4 psi).

PRESSURE RELIEF VALVE

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.

When the pressure of refrigerant in the system increases to an abnormal level [more than 2,990 kPa (30.5 kg/
cm

, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into

the atmosphere.

August 2012

2012 Pathfinder

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-15

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

AUTOMATIC AIR CONDITIONER SYSTEM

Control System Diagram

INFOID:0000000007356340

CONTROL SYSTEM

The control system consists of input sensors, switches, the A/C auto amp. (microcomputer) and outputs.

The relationship of these components is shown in the figure below:

Control System Description

INFOID:0000000007356341

CONTROL OPERATION

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HAC-16

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

A/C Auto Amp.

DISPLAY SCREEN

Displays the operational status of the system.

AUTO SWITCH

• Pressing the AUTO switch will illuminate the LED and "Auto" will be visible on the display. The A/C indicator

will illuminate.

• The A/C 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 oper-

ator.

• When pressing AUTO switch, air inlet, air outlet, blower speed, and discharge air temperature are automati-

cally controlled.

• A partial AUTO mode can be achieved by only changing the blower speed or by changing the mode position.

If both the blower speed and the mode positions are changed, the AUTO mode will be cancelled.

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 foot 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

When switch is ON, rear window and door mirrors are defogged.

OFF SWITCH

The A/C 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.

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 SWITCH

Controls the air discharge outlets.

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AUTOMATIC AIR CONDITIONER SYSTEM

HAC-17

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

FRONT BLOWER CONTROL SWITCHES

Manually control the blower speed.

Rear Air Controls

TEMPERATURE CONTROL DIAL (TEMPERATURE AND MODE CONTROL)

The temperature increases or decreases the set temperature. The mode also changes from foot at full hot set-

ting, to foot/vent at mid-range (warm) setting, and then to vent at full cold setting.

REAR BLOWER CONTROL DIAL (FRONT)

When the REAR CTRL switch is in the off (indicator off) the rear air control (front) controls the rear blower

motor speed regardless of the rear air control (rear) blower control dial (rear) position. The rear air control

(front) controls the blower motor speed.

REAR BLOWER CONTROL DIAL (REAR)

When the REAR CTRL switch is on (indicator on) the rear air control (rear) controls the rear blower motor

speed regardless of the rear air control (front) blower control dial (front) position. The rear air control (rear)

controls the blower motor speed.

MAGNET CLUTCH CONTROL

When A/C switch or DEF switch is pressed, A/C auto amp. inputs compressor ON signal to BCM.

BCM sends compressor ON signal to ECM and A/C auto amp., via CAN communication line.

AWIIA0224ZZ

Rear air control (front)

Rear air control (rear)

AWIIA0089GB

August 2012

2012 Pathfinder

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