Nissan Pathfinder (2011 year). Manual - part 459

REFRIGERATION SYSTEM

HAC-135

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

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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

2

, 398 psi), or below

about 120 kPa (1.22 kg/cm

2

, 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

2

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

the atmosphere.

2011 Pathfinder

HAC-136

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

MANUAL AIR CONDITIONER SYSTEM

MANUAL AIR CONDITIONER SYSTEM

Control System Diagram

INFOID:0000000006243699

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

INFOID:0000000006243700

CONTROL OPERATION

Front air control

AWIIA0592GB

WJIA1510E

2011 Pathfinder

MANUAL AIR CONDITIONER SYSTEM

HAC-137

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

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TEMPERATURE CONTROL DIAL (TEMPERATURE CONTROL)

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, or at the D/F or FOOT position.

DEFROSTER (

) SWITCH

Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position.

REAR WINDOW DEFOGGER SWITCH

When switch is ON, rear window is defogged.

OFF SWITCH (BLOWER SPEED SET TO 0)

The compressor and blower are OFF.

A/C SWITCH

The compressor is ON or OFF.

(Pressing the A/C switch will turn off the A/C switch and compressor.)

MODE DIAL

Controls the air discharge outlets.

FRONT BLOWER CONTROL DIAL

Manually controls the four blower speeds.

MAGNET CLUTCH CONTROL

When the A/C switch is pressed, or the mode dial is turned to the DEF or D/F position, the front air control out-

puts a compressor ON signal to BCM.

The BCM then sends a compressor ON signal to ECM, 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.

1.

Temperature control dial

2.

Blower control dial

3.

A/C switch

4.

Rear window defogger switch

5.

Recirculation switch

6.

Mode dial

WJIA1293E

2011 Pathfinder

HAC-138

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

MANUAL AIR CONDITIONER SYSTEM

Discharge Air Flow

INFOID:0000000006243701

Switches And Their Control Function

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SWITCHES AND THEIR CONTROL FUNCTION

Mode door position

Air outlet/distribution

Vent

Foot

Defroster

95%

5%

—

60%

40%

—

20%

55%

25%

15%

50%

35%

7%

15%

78%

Airflow always present at driver and passenger side demisters

WJIA1296E

AWIIA0271GB

2011 Pathfinder

MANUAL AIR CONDITIONER SYSTEM

HAC-139

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

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WJIA1497E

2011 Pathfinder

HAC-140

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

DIAGNOSIS SYSTEM (BCM)

DIAGNOSIS SYSTEM (BCM)

COMMON ITEM
COMMON ITEM : CONSULT-III Function (BCM - COMMON ITEM)

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APPLICATION ITEM

CONSULT-III performs the following functions via CAN communication with BCM.

SYSTEM APPLICATION

BCM can perform the following functions.

Direct Diagnostic Mode

Description

Ecu Identification

The BCM part number is displayed.

Self Diagnostic Result

The BCM self diagnostic results are displayed.

Data Monitor

The BCM input/output data is displayed in real time.

Active Test

The BCM activates outputs to test components.

Work support

The settings for BCM functions can be changed.

Configuration

• The vehicle specification can be read and saved.
• The vehicle specification can be written when replacing BCM.

CAN Diag Support Mntr

The result of transmit/receive diagnosis of CAN communication is displayed.

System

Sub System

Direct Diagnostic Mode

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Door lock

DOOR LOCK

×

×

×

×

Rear window defogger

REAR DEFOGGER

×

×

Warning chime

BUZZER

×

×

Interior room lamp timer

INT LAMP

×

×

×

Remote keyless entry system

MULTI REMOTE ENT

×

×

×

Exterior lamp

HEAD LAMP

×

×

×

Wiper and washer

WIPER

×

×

×

Turn signal and hazard warning lamps FLASHER

×

×

Air conditioner

AIR CONDITIONER

×

Intelligent Key system

INTELLIGENT KEY

×

Combination switch

COMB SW

×

BCM

BCM

×

×

×

×

×

Immobilizer

IMMU

×

×

×

Interior room lamp battery saver

BATTERY SAVER

×

×

×

Back door open

TRUNK

×

×

Vehicle security system

THEFT ALM

×

×

×

RAP system

RETAINED PWR

×

×

×

Signal buffer system

SIGNAL BUFFER

×

×

TPMS

AIR PRESSURE MONITOR

×

×

×

×

Panic alarm system

PANIC ALARM

×

2011 Pathfinder

DIAGNOSIS SYSTEM (BCM)

HAC-141

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

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AIR CONDITIONER
AIR CONDITIONER : CONSULT-III Function (BCM - AIR CONDITIONER)

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DATA MONITOR

Monitor Item [Unit]

Description

IGN ON SW [On/Off]

Indicates condition of ignition switch ON position.

FAN ON SIG [On/Off]

Indicates condition of fan switch.

AIR COND SW [On/Off]

Indicates condition of A/C switch.

2011 Pathfinder

HAC-142

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MODE DOOR MOTOR

DTC/CIRCUIT DIAGNOSIS

MODE DOOR MOTOR

System Description

INFOID:0000000006243705

SYSTEM DESCRIPTION

Component Parts

Mode door control system components are:

• Front air control

• Mode door motor

• PBR (built into mode door motor)

• Intake sensor

System Operation

The mode door position (vent, B/L, foot, D/F, and defrost) is set by the front air control by means of the mode

door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of

the mode door motor while ground is applied to the other circuit, causing the mode door motor to rotate. The

direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied

to it. The front air control monitors the mode door position by measuring the voltage signal on the PBR circuit.

COMPONENT DESCRIPTION

Mode Door Motor

The mode door motor is attached to the heater and cooling unit

assembly. It rotates so that air is discharged from the outlet as indi-

cated by the front air control. Motor rotation is conveyed to a link

which activates the mode door.

Mode Door Motor (Front) Component Function Check

INFOID:0000000006243706

SYMPTOM:

• Air outlet does not change.

• Mode door motor does not operate normally.

WJIA1314E

WJIA1484E

2011 Pathfinder