Index Infiniti Infiniti QX56 (JA60) - service repair manual 2010 year

Content .. 584 585 586 587 ..

Infiniti QX56 (JA60). Manual - part 586

HAC-1

VENTILATION, HEATER & AIR CONDITIONER

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SECTION

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CONTENTS

HEATER & AIR CONDITIONING CONTROL SYSTEM

AUTOMATIC AIR CONDITIONER

BASIC INSPECTION ....................................

DIAGNOSIS AND REPAIR WORKFLOW ..........

How to Perform Trouble Diagnosis For Quick And
Accurate Repair ........................................................

INSPECTION AND ADJUSTMENT .....................

Operational Check (Front) .........................................

Operational Check (Rear) .........................................

FUNCTION DIAGNOSIS ...............................

FUNCTION INFORMATION ................................

Component Part Location .........................................

Symptom Table .........................................................

REFRIGERATION SYSTEM ..............................

Refrigerant Cycle ....................................................

Refrigerant System Protection ................................

AUTOMATIC AIR CONDITIONER SYSTEM .....

Control System Diagram .........................................

Control System Description .....................................

Discharge Air Flow (Front) ......................................

Discharge Air Flow (Rear) .......................................

Switches And Their Control Function (Front) ..........

Switches And Their Control Function (Rear) ...........

DIAGNOSIS SYSTEM (HVAC) ..........................

CONSULT-III Function (HVAC) ...............................

DIAGNOSIS SYSTEM (BCM) ............................

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

CONSULT-III Function (BCM - AIR CONDITION-
ER) ..........................................................................

SELF-DIAGNOSIS FUNCTION ..........................

A/C Auto Amp. Self-Diagnosis ................................

A/C and AV Switch Assembly Self-Diagnosis .........

A/C System Self-Diagnosis Code Chart ..................

COMPONENT DIAGNOSIS .........................

MODE DOOR MOTOR ......................................

System Description ..................................................

Mode Door Motor (Front) Component Function
Check ......................................................................

Mode Door Motor (Front) Diagnosis Procedure ......

AIR MIX DOOR MOTOR ...................................

System Description ..................................................

Air Mix Door Motor (Driver) Component Function
Check ......................................................................

Air Mix Door Motor (Driver) Diagnosis Procedure ....

Air Mix Door Motor (Passenger) Component
Function Check ........................................................

Air Mix Door Motor (Passenger) Diagnosis Proce-
dure .........................................................................

INTAKE DOOR MOTOR ...................................

System Description ..................................................

Intake Door Motor Component Function Check ......

Intake Door Motor Diagnosis Procedure .................

DEFROSTER DOOR MOTOR CIRCUIT ...........

System Description ..................................................

Defroster Door Motor Component Function Check

Defroster Door Motor Diagnosis Procedure ............

BLOWER MOTOR CONTROL SYSTEM ..........

System Description ..................................................

Front Blower Motor Component Function Check ....

Front Blower Motor Diagnosis Procedure ................

Front Blower Motor Component Inspection .............

Rear Blower Motor Description ................................

Rear Blower Motor Component Function Check .....

Rear Air Control (Front) Diagnosis Procedure #1 ....

Rear Air Control (Rear) Diagnosis Procedure #2 ....

Rear Blower Motor Component Inspection ..............

REAR AIR CONTROL SYSTEM .......................

Rear Air Control System Description .......................

HAC-2

Rear Air Control Component Function Check ........

Air Mix Door Motor (Rear) Diagnosis Procedure ....

Mode Door Motor (Rear) Diagnosis Procedure ......

MAGNET CLUTCH ............................................

System Description .................................................

Magnet Clutch Component Function Check ...........

Magnet Clutch Diagnosis Procedure ......................

WATER VALVE CIRCUIT ..................................

Description ..............................................................

Water Valve Diagnosis Procedure ..........................

AMBIENT SENSOR ...........................................

Component Description ..........................................

Ambient Sensor Diagnosis Procedure ....................

Ambient Sensor Component Inspection .................

IN-VEHICLE SENSOR .......................................

Component Description ..........................................

In-Vehicle Sensor Diagnosis Procedure .................

In-Vehicle Sensor Component Inspection ..............

OPTICAL SENSOR ...........................................

Component Description ..........................................

Optical Sensor Diagnosis Procedure ......................

INTAKE SENSOR ..............................................

System Description .................................................

Intake Sensor Diagnosis Procedure .......................

Intake Sensor Component Inspection ....................

POWER SUPPLY AND GROUND CIRCUIT
FOR CONTROLLER ..........................................

Component Description ..........................................

A/C Auto Amp. Component Function Check ..........

A/C Auto Amp Power and Ground Diagnosis Pro-
cedure .....................................................................

ECU DIAGNOSIS .......................................

AIR CONDITIONER CONTROL ........................

A/C Auto Amp. Terminals Reference Values ..........

Wiring Diagram .......................................................

SYMPTOM DIAGNOSIS ...........................

AIR CONDITIONER CONTROL .......................

Symptom Matrix Chart .........................................

INSUFFICIENT COOLING ................................

Component Function Check .................................

Diagnostic Work Flow ...........................................

Performance Chart ................................................

Trouble Diagnoses for Abnormal Pressure ...........

INSUFFICIENT HEATING ................................

Component Function Check .................................

NOISE ...............................................................

Component Function Check .................................

MEMORY FUNCTION DOES NOT OPERATE ..

Memory Function Check .......................................

PRECAUTION ...........................................

PRECAUTIONS ................................................

Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...............................................................

Working with HFC-134a (R-134a) .........................

Precaution for Service Equipment ........................

DIAGNOSIS AND REPAIR WORKFLOW

HAC-3

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

How to Perform Trouble Diagnosis For Quick And Accurate Repair

INFOID:0000000005147668

WORK FLOW

1.

LISTEN TO CUSTOMER COMPLAINT

Listen to customer complaint. Get detailed information about the conditions and environment when the symp-

tom occurs.

>> GO TO 2

2.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 3.

3.

VERIFY THE SYMPTOM WITH OPERATIONAL CHECK

Verify the symptom with operational check. Refer to

HAC-4, "Operational Check (Front)"

Can a symptom be duplicated?

YES

>> GO TO 4

NO

>> GO TO 5

4.

GO TO APPROPRIATE TROUBLE DIAGNOSIS

Go to appropriate trouble diagnosis. Refer to

HAC-107, "Symptom Matrix Chart"

Can a symptom be duplicated?

>> GO TO 5.

5.

PERFORM THE A/C AUTO AMP SELF-DIAGNOSIS

Perform A/C auto amp. self-diagnosis. Refer to

HAC-23, "A/C Auto Amp. Self-Diagnosis"

.

>> If any diagnostic trouble codes set. Refer to

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

.

>> Confirm the repair by performing operational check. Refer to

HAC-4, "Operational Check (Front)"

.

HAC-4

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

INSPECTION AND ADJUSTMENT

INSPECTION AND ADJUSTMENT

Operational Check (Front)

INFOID:0000000005147669

The purpose of the operational check is to confirm that the system operates properly.

CHECKING MEMORY FUNCTION

1. Set the temperature to 32

° (90°F).

2. Press the OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.

5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous temperature.

7. Press the OFF switch.
If NG, go to trouble diagnosis procedure for

HAC-120, "Memory Function Check"

If OK, continue with next check.

CHECKING BLOWER

1. Press the blower speed control switch (+) once, blower should operate on low speed. The fan display

should have one bar lit (on display).

2. Press the blower speed control switch (+) again, and continue checking blower speed and fan display until

all speeds are checked.

3. Leave blower on maximum speed.
If NG, go to trouble diagnosis procedure for

HAC-48, "Front Blower Motor Diagnosis Procedure"

.

If OK, continue with next check.

CHECKING DISCHARGE AIR

1. Press MODE switch four times and the DEF

switch.

2. Each position indicator should change shape (on display).

3. Confirm that discharge air comes out according to the air distribution table. Refer to

HAC-16, "Discharge

Air Flow (Front)"

Mode door position is checked in the next step.

If NG, go to trouble diagnosis procedure for

HAC-26, "Mode Door Motor (Front) Diagnosis Procedure"

.

If OK, continue the check.

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at

fresh when the DEF or D/F is selected.

CHECKING RECIRCULATION ( , ONLY)

1. Press recirculation (

) switch one time. Recirculation indicator should illuminate.

2. Press recirculation (

) switch one more time. Recirculation indicator should go off.

3. Listen for intake door position change (blower sound should change slightly).
If NG, go to trouble diagnosis procedure for

HAC-40, "Intake Door Motor Diagnosis Procedure"

.

If OK, continue the check.

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF or D/F is selected. REC (

) is not allowed in DEF (

) D/F (

) or FOOT (

).

CHECKING TEMPERATURE DECREASE

1. Rotate temperature control dial (drive or passenger) counterclockwise until 18

°C (60°F) is displayed.

2. Check for cold air at appropriate discharge air outlets.

Conditions

: Engine running and at normal operating temperature

Content .. 584 585 586 587 ..