Nissan Pathfinder (2010 year). Manual - part 441

HAC-4

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

How to Perform Trouble Diagnosis For Quick And Accurate Repair

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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-123, "Operational Check"

. 

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-172, "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-24, "A/C Auto Amp. Self-Diagnosis"

.

>> If any diagnostic trouble codes set. Refer to 

HAC-25, "A/C System Self-Diagnosis Code Chart"

.

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

HAC-123, "Operational Check"

.

2010 Pathfinder

INSPECTION AND ADJUSTMENT

HAC-5

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

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INSPECTION AND ADJUSTMENT

Operational Check (Front)

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

CHECKING MEMORY FUNCTION

1. Set the temperature to 32

°

C (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-119, "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-147, "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-18, "Discharge

Air Flow (Front)"

.

Mode door position is checked in the next step.

If NG, go to trouble diagnosis procedure for 

HAC-137, "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 FOOT, 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-144, "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 FOOT, 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

2010 Pathfinder

HAC-6

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

INSPECTION AND ADJUSTMENT

If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for 

HAC-173,

"Component Function Check"

. If air mix door motor appears to be malfunctioning, go to 

HAC-32, "Air Mix Door

Motor (Driver) Component Function Check"

. 

If OK, continue the check.

CHECKING TEMPERATURE INCREASE

1. Rotate temperature control dial clockwise (drive or passenger) until 32

°

C (90

°

F) is displayed.

2. Check for hot air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for 

HAC-181,

"Component Function Check"

. If air mix door motor appears to be malfunctioning, go to 

HAC-32, "Air Mix Door

Motor (Driver) Component Function Check"

.  

If OK, continue with next check.

CHECK A/C SWITCH

1. Press A/C switch when AUTO switch is ON, or in manual mode.
2. A/C switch indicator will turn ON.

• Confirm that the compressor clutch engages (sound or visual inspection).

NOTE:

If current mode setting is DEF or D/F, compressor clutch will already be engaged and cannot be turned off.

If NG, go to trouble diagnosis procedure for 

HAC-153, "Magnet Clutch Diagnosis Procedure"

.

If OK, continue with next check.

CHECKING AUTO MODE

1. Press AUTO switch.
2. Display should indicate AUTO.

• If ambient temperature is warm, and selected temperature is cool, confirm that the compressor clutch

engages (sound or visual inspection). (Discharge air and blower speed will depend on ambient, in-vehi-

cle, and set temperatures.)

If NG, go to trouble diagnosis procedure for 

HAC-160, "Front Air Control Power and Ground Diagnosis Proce-

dure"

, then if necessary, trouble diagnosis procedure for  

HAC-153, "Magnet Clutch Diagnosis Procedure"

.

If all operational checks are OK (symptom cannot be duplicated), go to malfunction Simulation Tests in  

HAC-

122, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"

 and perform tests as outlined to sim-

ulate driving conditions environment. If symptom appears. Refer to 

HAC-172, "Symptom Matrix Chart"

, and

perform applicable trouble diagnosis procedures.

Operational Check (Rear)

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

CHECKING REAR BLOWER MOTOR

1. Turn the ignition switch ON.
2. Rotate rear air control (front) blower control dial to low speed.
3. Rotate the blower control dial clockwise and continue checking blower speed until all speeds are checked.
4. Leave blower on maximum speed.
5. Press the REAR CTRL switch from the rear air control (front).
6. Rotate rear air control (rear) blower control dial to low speed.
7. Rotate the blower control dial clockwise and continue checking blower speed until all speeds are checked.
8. Leave blower on maximum speed.
If NG, go to trouble diagnosis procedure for 

HAC-50, "Rear Blower Motor Component Function Check"

.

If OK, continue with next check.

CHECKING REAR TEMPERATURE DECREASE

1. Press the REAR CTRL switch (indicator off).
2. Rotate the rear air control (front) temperature control dial counterclockwise to maximum cold.
3. Check for cold air at appropriate discharge air outlets.

Conditions

: Engine running and at normal operating temperature

2010 Pathfinder

INSPECTION AND ADJUSTMENT

HAC-7

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

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4. Press the REAR CTRL switch (indicator on) from the rear air control (front).
5. Rotate the rear air control (rear) temperature control dial counterclockwise to maximum cold.
6. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for 

HAC-140,

"Air Mix Door Motor Component Function Check"

. If air mix door motor appears to be malfunctioning, go to

HAC-62, "Rear Air Control (Rear) Diagnosis Procedure"

.

If OK, continue with next check.

CHECKING REAR TEMPERATURE INCREASE

1. Press the REAR CTRL switch (indicator off).
2. Rotate the rear air control (front) temperature control dial clockwise to maximum heat.
3. Check for hot air at appropriate discharge air outlets.
4. Press the REAR CTRL switch (indictor on) from the rear air control (front).
5. Rotate the rear air control (rear) temperature control dial clockwise to maximum heat.
6. Check for hot air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for 

HAC-115,

"Component Function Check"

. If air mix door motor appears to be malfunctioning, go to 

HAC-62, "Rear Air

Control (Rear) Diagnosis Procedure"

.

If NG, go to trouble diagnosis procedure for 

HAC-181, "Component Function Check"

.

If all operational checks are OK (symptom cannot be duplicated), go to 

HAC-122, "How to Perform Trouble

Diagnosis For Quick And Accurate Repair"

 and perform tests as outlined. If symptom appears, refer to 

HAC-

172, "Symptom Matrix Chart"

 and perform applicable trouble diagnosis procedures.

2010 Pathfinder

HAC-8

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

FUNCTION DIAGNOSIS

FUNCTION INFORMATION

Component Part Location

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ENGINE COMPARTMENT

VQ40DE

WJIA2270E

1.

Heater pump relay E144

2.

Refrigerant pressure sensor E48 
(View with battery removed)

⇐

: Front  

3.

Ambient sensor E1 (View with grille 
removed)

4.

A/C compressor F3

5.

Heater pump E141

2010 Pathfinder

FUNCTION INFORMATION

HAC-9

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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VK56DE

PASSENGER COMPARTMENT

AWIIA0220ZZ

1.

Refrigerant pressure sensor E50 
(View with battery removed)

⇐

: Front  

2.

Ambient sensorE1 (View with grille 
removed)

3.

A/C compressor F3

4.

Water valve F68

2010 Pathfinder

HAC-10

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

1.

A/C Auto amp. M49, M50

2.

In-vehicle sensor M32

3.

Intake sensor M146

4.

Intake door motor M58

5.

Variable blower control (front) 
M122

6.

Air mix door motor (driver) M147

7.

Mode door motor (front) M142

8.

Air mix door motor (passenger) 
M143

9.

Optical sensor M145

⇐

:Front

AWIIA0221ZZ

2010 Pathfinder

FUNCTION INFORMATION

HAC-11

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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REAR PASSENGER COMPARTMENT

Symptom Table

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1.

Rear air control (front) R2

2.

Rear air control (rear) M208

3.

Rear blower motor B501

4.

Variable blower control (rear) B133

5. 

Air mix door motor (rear) B155

AWIIA0222ZZ

Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-86

A/C system display is malfunctioning (with 
NAVI).

Go to Navigation System.

AV-372

A/C system display is malfunctioning (without 
NAVI).

Go to Mid-level Audio System.

AV-194

A/C system cannot be controlled.

Go to Self-diagnosis Function.

HAC-24

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

HAC-27

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

HAC-32

Air mix door motor is malfunctioning.

2010 Pathfinder