Nissan Pathfinder (2009 year). Manual - part 467

REFRIGERATION SYSTEM

HAC-131

< FUNCTION DIAGNOSIS >

[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.

2009 Pathfinder

HAC-132

< FUNCTION DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MANUAL AIR CONDITIONER SYSTEM

MANUAL 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

Front air control

AWIIA0592GB

WJIA1510E

2009 Pathfinder

MANUAL AIR CONDITIONER SYSTEM

HAC-133

< FUNCTION DIAGNOSIS >

[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

2009 Pathfinder

HAC-134

< FUNCTION DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MANUAL AIR CONDITIONER SYSTEM

Discharge Air Flow

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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

2009 Pathfinder

MANUAL AIR CONDITIONER SYSTEM

HAC-135

< FUNCTION DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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WJIA1497E

2009 Pathfinder

HAC-136

< FUNCTION DIAGNOSIS >

[MANUAL AIR CONDITIONER]

DIAGNOSIS SYSTEM (BCM)

DIAGNOSIS SYSTEM (BCM)

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 for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.

1: With remote keyless entry system

2: With Intelligent Key

CONSULT-III Function (BCM - AUTO AIR CONDITIONER)

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DATA MONITOR

Diagnosis mode

Function Description

WORK SUPPORT

Changes the setting for each system function.

SELF-DIAG RESULTS

Displays the diagnosis results judged by BCM. Refer to 

BCS-54, "DTC Index"

.

CAN DIAG SUPPORT MNTR

Monitors the reception status of CAN communication viewed from BCM.

DATA MONITOR

The BCM input/output signals are displayed.

ACTIVE TEST

The signals used to activate each device are forcibly supplied from BCM.

ECU IDENTIFICATION

The BCM part number is displayed.

CONFIGURATION

• Enables to read and save the vehicle specification.
• Enables to write the vehicle specification when replacing BCM.

System

Sub system selection item

Diagnosis mode

WORK SUPPORT

DATA MONITOR

ACTIVE TEST

BCM

BCM

×

Door lock

DOOR LOCK

×

×

×

Rear window defogger

REAR DEFOGGER

×

Warning chime

BUZZER

×

×

Interior room lamp timer

INT LAMP

×

×

×

Remote keyless entry system

1

MULTI REMOTE ENT

×

×

×

Exterior lamp

HEAD LAMP

×

×

×

Wiper and washer

WIPER

×

×

×

Turn signal and hazard warning lamps

FLASHER

×

×

Air conditioner

AIR CONDITONER

×

Intelligent Key system

2

INTELLIGENT KEY

×

Combination switch

COMB SW

×

Immobilizer

IMMU

×

×

Interior room lamp battery saver

BATTERY SAVER

×

×

×

Back door open

TRUNK

×

×

RAP (retained accessory power)

RETAINED PWR

×

×

×

Signal buffer system

SIGNAL BUFFER

×

×

TPMS (tire pressure monitoring sys-
tem)

AIR PRESSURE MONITOR 

×

×

×

Vehicle security system

PANIC ALARM

×

2009 Pathfinder

DIAGNOSIS SYSTEM (BCM)

HAC-137

< FUNCTION DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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Monitor Item

[Unit]

Contents

IGN ON SW [ON/OFF]

Display [ignition switch position (On)/(Off), ACC position (Off)] status as judged from ignition 
switch signal

FAN ON SIG [ON/OFF]

Display [FAN (On)/FAN (Off)] status as judged form blower fan motor switch signal

AIR COND SW [ON/OFF]

Display [COMP (On)/COMP (Off)] status as judged form air conditioner switch signal

2009 Pathfinder

HAC-138

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MODE DOOR MOTOR

COMPONENT DIAGNOSIS

MODE DOOR MOTOR

System Description

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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

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SYMPTOM:

• Air outlet does not change.
• Mode door motor does not operate normally.

WJIA1314E

WJIA1484E

2009 Pathfinder