Nissan Pathfinder (2008 year). Manual — part 434

HAC-16

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

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.

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Rear air control (front)

2.

Rear air control (rear)

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AUTOMATIC AIR CONDITIONER SYSTEM

HAC-17

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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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 (Front)

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Mode door position

Air outlet/distribution

Vent

Foot

Defroster

100%

0%

—

60%

40%

—

18%

64%

18%

14%

53%

33%

—

13%

87%

LJIA0172E

HAC-18

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

Switches And Their Control Function (Front)

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WJIA1680E

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AUTOMATIC AIR CONDITIONER SYSTEM

HAC-19

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Switches And Their Control Function (Rear)

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HAC-20

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

CAN COMMUNICATION SYSTEM

CAN COMMUNICATION SYSTEM

System Description

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Refer to

LAN-4, "System Description"

.

DIAGNOSIS SYSTEM (HVAC)

HAC-21

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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DIAGNOSIS SYSTEM (HVAC)

CONSULT-III Function (HVAC)

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CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.

SELF-DIAGNOSIS

Display Item List

DATA MONITOR

Display Item List

Diagnostic mode

Description

SELF-DIAG RESULTS

Displays A/C auto amp. self-diagnosis results.

DATA MONITOR

Displays A/C auto amp. input/output data in real time.

CAN DIAG SUPPORT MNTR

The result of transmit/receive diagnosis of CAN communication can be read.

ECU PART NUMBER

A/C auto amp. part number can be read.

DTC

Description

Reference page

B2573

Battery voltage out of range

CHG-4, "Work Flow"

B2578

In-vehicle sensor circuit out of range (low)

HAC-80, "In-Vehicle Sensor Diagnosis Procedure"

B2579

In-vehicle sensor circuit out of range (high)

B257B

Ambient sensor circuit short

HAC-77, "Ambient Sensor Diagnosis Procedure"

B257C

Ambient sensor circuit open

B257F

Optical sensor (Driver) circuit open or short

HAC-83, "Optical Sensor Diagnosis Procedure"

.

B2580

Optical sensor (Passenger) circuit open or short

B2581

Intake sensor circuit short

HAC-85, "Intake Sensor Diagnosis Procedure"

B2582

Intake sensor circuit open

U1000

CAN bus fault

LAN-4, "System Description"

Monitor item

Value

Contents

BATT VIA CAN

"V"

Displays battery voltage signal.

IGN VIA CAN

"ON/OFF"

Displays ignition switch signal.

DVR SUNLD SEN

"w/m2"

Displays optical sensor (driver) signal.

PAS SUNLD SEN

"w/m2"

Displays optical sensor (passenger) signal.

AMB TEMP SEN

"

°

C/

°

F"

Displays ambient sensor signal.

EVAP TEMP SEN

"

°

C/

°

F"

Displays intake sensor signal.

INCAR TMP SEN

"

°

C/

°

F"

Displays in-vehicle sensor signal.

RR TEMPSET FR

"V"

Displays air mix door (front) set point signal.

RR TEMPSET RR

"V"

Displays air mix door (rear) set point signal.

MODE FDBCK

"V"

Displays mode door motor feedback signal.

DVR MIX FDBCK

"V"

Displays air mix door motor (driver) feedback signal.

PAS MIX FDBCK

"V"

Displays air mix door motor (passenger) feedback signal.

RR FDBCK

"V"

Displays air mix door motor (rear) feedback signal.

HAC-22

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (BCM)

DIAGNOSIS SYSTEM (BCM)

CONSULT-III Function (BCM)

INFOID:0000000001366697

CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.

DATA MONITOR

Display Item List

BCM diagnostic

test item

Diagnostic mode

Description

Inspection by part

WORK SUPPORT

Supports inspections and adjustments. Commands are transmitted to the BCM for
setting the status suitable for required operation, input/output signals are received
from the BCM and received data is displayed.

DATA MONITOR

Displays BCM input/output data in real time.

ACTIVE TEST

Operation of electrical loads can be checked by sending drive signal to them.

SELF-DIAG RESULTS

Displays BCM self-diagnosis results.

CAN DIAG SUPPORT MNTR

The result of transmit/receive diagnosis of CAN communication can be read.

ECU PART NUMBER

BCM part number can be read.

CONFIGURATION

Performs BCM configuration read/write functions.

Monitor item name “operation or

unit”

Contents

IGN ON SW

“ON/OFF”

Displays “IGN Position (ON)/OFF, ACC Position (OFF)” status as judged from ignition switch signal.

COMP ON SIG

“ON/OFF”

Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.

FAN ON SIG

“ON/OFF”

Displays “FAN (ON)/FAN (OFF)” status as judged from blower motor switch signal.

SELF-DIAGNOSIS FUNCTION

HAC-23

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[AUTOMATIC AIR CONDITIONER]

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SELF-DIAGNOSIS FUNCTION

A/C Auto Amp. Self-Diagnosis

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A/C SYSTEM SELF-DIAGNOSIS FUNCTION

The self-diagnosis function is built into the A/C auto amp. to quickly locate the cause of malfunctions.

DESCRIPTION

The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on A/C auto amp. Refer to
applicable sections (items) for details. Fault codes (if any are present) will be displayed in the ambient temper-
ature display area. Refer to

HAC-24, "A/C System Self-Diagnosis Code Chart"

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SELF-DIAGNOSTIC MODE

NOTE:
Radio must be OFF.

1.

Turn the ignition switch ON.

2.

On the A/C and AV switch assembly, press the "SETTING" but-
ton and twist the volume knob clockwise and counterclockwise
until the Self-Diagnosis screen shows on the display.

3.

Scroll down to "Confirmation/Adjustment" and press the
"ENTER" button.

4.

Scroll down to "Climate Control" and press the "ENTER" button.

5.

The fan bars will flash on the display during the self-test, and
then the fault codes will display in the ambient temperature area.
They will continue scrolling until diagnostic mode is exited.

6.

Exit by pressing the "BACK" button on A/C and AV switch
assembly until display returns to its normal operation screen.
HVAC system will be OFF or by turning the ignition switch OFF.

The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on A/C auto amp. Refer to
applicable sections (items) for details. Fault codes (if any are present) will be displayed in the ambient temper-
ature display area. Refer to

HAC-24, "A/C System Self-Diagnosis Code Chart"

.

A/C and AV Switch Assembly Self-Diagnosis

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A/C and AV switch assembly self-diagnosis function

The ON/OFF operation (continuity) of each switch in the A/C and AV switch assembly can be checked.

Self-diagnosis mode

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