Nissan Xterra. Manual - part 453

HAC-10

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

MANUAL AIR CONDITIONER SYSTEM

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 defogger is activated.

OFF SWITCH (BLOWER SPEED DIAL)

When the blower speed dial is turned all the way counter-clockwise, the compressor and blower are OFF.

A/C SWITCH 

Sends a signal to the BCM requesting the A/C compressor be turned ON or OFF.

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

MODE SWITCHES

Controls the air discharge outlets.

FRONT BLOWER CONTROL DIAL

Sends a fan ON signal to the BCM and manually controls the blower speed.

MAGNET CLUTCH CONTROL

In order for the IPDM E/R to complete a compressor ON request, the following conditions must be met:

• The blower speed dial is in one of the fan speed positions. This allows the front air control to send a fan ON

signal to the BCM. 

• The A/C switch is pressed. The A/C switch LED illuminates and the front air control outputs a compressor

ON signal to the BCM. Any mode control button may be selected. 

• If the A/C switch is OFF, and the MAX A/C button is pressed, the A/C switch LED will automatically illuminate

and the front air control outputs a compressor ON signal to the BCM. 

• If the A/C switch is OFF, and the mode buttons for either D/F or DEF are selected, the front air control will

send a compressor ON signal to the BCM, but it does not illuminate the A/C switch LED

• The intake temperature value must be within the specified range.

Once the front air control conditions are met and the fan ON and compressor ON signals are detected by the

BCM:

• The BCM sends a compressor ON signal to the ECM, via CAN communication line.

AWIIA1399GB

MANUAL AIR CONDITIONER SYSTEM

HAC-11

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

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• The ECM judges whether the compressor can be turned ON, based on each sensor status (refrigerant pres-

sure sensor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compres-

sor ON signal 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 the

compressor.

Defrost latching logic

If the compressor was engaged by pressing the D/F or DEF mode buttons, and the time spent in either mode

exceeds 1 minute, then the compressor stays requested, even when modes other than D/F or DEF are

selected, until either:

1. The ignition switch is turned OFF.

2. The blower speed dial is turned completely counter-clockwise to the OFF position.

3. The A/C switch is manually turned OFF.

In other words, the compressor ON request cannot be turned off in D/F or DEF modes.

Discharge Air Flow

INFOID:0000000009482461

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

HAC-12

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

MANUAL AIR CONDITIONER SYSTEM

Switches And Their Control Function

INFOID:0000000009482462

SWITCHES AND THEIR CONTROL FUNCTION

AWIIA1650GB

AWIIA1393GB

DIAGNOSIS SYSTEM (HVAC)

HAC-13

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

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DIAGNOSIS SYSTEM (HVAC)

CONSULT Function (HVAC)

INFOID:0000000010264874

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

DATA MONITOR

Display Item List

Diagnostic mode

Description

DATA MONITOR

Displays Front air control input/output data in real time.

CAN DIAG SUPPORT MNTR

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

ECU IDENTIFICATION

Front air control part number can be read.

Monitor item

Value

Contents

BATT VIA CAN

"V"

Displays battery voltage signal.

IGN VIA CAN 

"ON/OFF"

Displays ignition switch signal.

EVAP TEMP SEN

"

°C"

Displays intake sensor signal.

MODE FDBCK

"V"

Displays mode door motor feedback signal.

DVR MIX FDBCK

"V"

Displays air mix door motor (driver) feedback signal.

RECIRC

"ON/OFF"

Displays recirculation switch signal.

DEFROST

"ON/OFF"

Displays defrost switch signal.

A/C

"ON/OFF"

Displays A/C switch signal.

RR DEFOG

"ON/OFF"

Displays rear window defogger switch signal.

MODE SELECT

"DTNT"

Displays mode switch signal.