Nissan Pathfinder. Instruction - part 721

FRONT AUTOMATIC AIR CONDITIONING SYSTEM

HAC-145

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

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HAC

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• Insufficient cooling.
• No cool air comes out. (Air flow volume is normal.)

• Magnet clutch control system
• Drive belt slipping
• Refrigerant cycle
• Air leakage from each duct
• A/C auto amp. connection recogni-

tion signal circuit

• Temperature setting trimmer (front)

HAC-147, "FRONT AIR CONDI-
TIONER : Diagnosis Procedure"

• Insufficient heating.
• No warm air comes out. (Air flow volume is nor-

mal.)

• Engine cooling system
• Heater hose
• Heater core
• Air leakage from each duct
• Temperature setting trimmer (front)

HAC-149, "FRONT AIR CONDI-
TIONER : Diagnosis Procedure"

Noise is heard when front 
air conditioning system op-
erates.

During compressor 
operation

Refrigerant cycle

HA-18, "Symptom Table"

During front blower 
motor operation

• Mixing any foreign object in front 

blower motor

• Front blower motor fan breakage
• Front blower motor rotation inferiori-

ty

HAC-131, "Component Inspection 
(Front Blower Motor)"

• Memory function does not operate.
• Setting temperature is not memorized.

• Battery power supply system of A/C 

auto amp.

• A/C auto amp.

HAC-112, "A/C AUTO AMP. : Diag-
nosis Procedure"

Intelligent Key interlock function does not operate.

• Door lock system
• CAN communication circuit
• A/C auto amp.

HAC-151, "Diagnosis Procedure"

Symptom

Corresponding malfunction part

Reference

HAC-146

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

REAR AUTOMATIC AIR CONDITIONING SYSTEM

REAR AUTOMATIC AIR CONDITIONING SYSTEM

Diagnosis Chart By Symptom

INFOID:0000000009176882

NOTE:

• Perform the self-diagnoses with CONSULT before performing the symptom diagnosis. If DTC is detected,

perform the corresponding diagnosis.

• The following table is based on the condition that front automatic air conditioning system operates normally.

Symptom

Corresponding malfunction part

Reference

• Rear air conditioning cannot be controlled by front 

A/C control.

• Operation status of rear air conditioning is not indi-

cated on front A/C control display.

A/C auto amp.

Replace A/C auto amp. Refer to 

HAC-157, "Removal and Installa-
tion"

.

Rear air conditioning can-
not be controlled by rear air 
control.

Operation status of 
rear air conditioning is 
indicated on rear air 
control display.

Communication signal (rear air control 
→ A/C auto amp.)

Refer to 

HAC-109, "Diagnosis Pro-

cedure"

.

Operation status of 
rear air conditioning is 
not indicated on rear 
air control display.

Communication signal (A/C auto amp. 
→ rear air control)

Refer to 

HAC-109, "Diagnosis Pro-

cedure"

.

Rear air control power supply circuit

Refer to 

HAC-121, "REAR A/C 

CONTROL : Diagnosis Procedure"

.

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

• Circuit between mode door motor 

(rear) and A/C auto amp. 

• Mode door motor (rear) control link-

age

• Mode door motor (rear)
• A/C auto amp.

HAC-116, "MODE DOOR MOTOR 
(REAR) : Diagnosis Procedure"

• Discharge air temperature does not change.
• Air mix door motor (rear) does not operate normal-

ly.

• Circuit between air mix door motor 

(rear) and A/C auto amp. 

• Air mix door motor (rear) installation 

condition

• Air mix door motor (rear)
• A/C auto amp.

HAC-114, "AIR MIX DOOR MO-
TOR (REAR) : Diagnosis Proce-
dure"

Rear blower motor operation is malfunctioning.

• Power supply system of rear blower 

motor

• Circuit between rear blower motor 

and A/C auto amp.

• Rear blower motor
• A/C auto amp.

HAC-138, "Diagnosis Procedure"

• Insufficient cooling.
• No cool air comes out. (Air flow volume is normal.)

• A/C auto amp.
• Refrigerant cycle
• Air leakage from each duct
• Temperature setting trimmer (rear)

HAC-112, "A/C AUTO AMP. : Diag-
nosis Procedure"

• Insufficient heating.
• No warm air comes out. (Air flow volume is nor-

mal.)

• PTC heater
• Air leakage from each duct
• Temperature setting trimmer (rear)

HAC-136, "Diagnosis Procedure"

Noise is heard when rear blower motor operates.

• Mixing any foreign object in rear 

blower motor

• Rear blower motor fan breakage
• Rear blower motor rotation inferiori-

ty

HAC-142, "Component Inspection 
(Rear Blower Motor)"

INSUFFICIENT COOLING

HAC-147

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

INSUFFICIENT COOLING

FRONT AIR CONDITIONER
FRONT AIR CONDITIONER : Description

INFOID:0000000009176883

Symptom

• Insufficient cooling

• No cool air comes out. (Air flow volume is normal.)

FRONT AIR CONDITIONER : Diagnosis Procedure

INFOID:0000000009176884

NOTE:

Perform self-diagnoses with CONSULT before performing symptom diagnosis. If any DTC is detected, per-

form the corresponding diagnosis.

1.

CHECK MAGNET CLUTCH OPERATION

1. Turn ignition switch ON.

2. Operate fan switch.

3. Press A/C switch.

4. Check that A/C indicator turns ON. Check visually and by sound that compressor operates.

5. Press A/C switch again.

6. Check that A/C indicator turns OFF. Check that compressor stops.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform diagnosis of “COMPRESSOR DOES NOT OPERATE” in “SYMPTOM DIAGNOSIS”.

Refer to 

HAC-152, "Diagnosis Procedure"

.

2.

CHECK DRIVE BELT

Check tension of drive belt. Refer to 

EM-12, "Checking Drive Belt"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Adjust or replace drive belt depending on the inspection results.

3.

CHECK REFRIGERANT CYCLE

Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.

Refer to 

HA-18, "Symptom Table"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace parts depending on the inspection results.

4.

CHECK AIR LEAKAGE FROM EACH DUCT

Check duct and nozzle, etc. of the front air conditioning system for leakage.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace parts depending on the inspection results.

5.

CHECK AMBIENT TEMPERATURE DISPLAY

Check that there is not much difference between actual ambient temperature and indicated temperature on

information display in combination meter.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Perform diagnosis for the A/C auto amp. connection recognition signal circuit. Refer to 

HAC-86,

"Diagnosis Procedure"

.

6.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)

1. Check setting value of temperature setting trimmer (front). Refer to 

HAC-78, "FRONT AUTOMATIC AIR

CONDITIONING SYSTEM : Temperature Setting Trimmer (Front)"

. 

2. Check that temperature setting trimmer (front) is set to “+ direction”. 

HAC-148

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

INSUFFICIENT COOLING

NOTE:

The control temperature can be set with the setting of the temperature setting trimmer (front).

3. Set difference between set temperature and control temperature to “0”.
Is inspection result normal?

YES

>> Inspection End.

NO

>> Replace A/C auto amp. Refer to 

HAC-157, "Removal and Installation"

.

REAR AIR CONDITIONER
REAR AIR CONDITIONER : Description

INFOID:0000000009176885

Symptom

• Insufficient cooling

• No cool air comes out. (Air flow volume is normal.)

REAR AIR CONDITIONER : Diagnosis Procedure

INFOID:0000000009176886

NOTE:

Perform self-diagnoses with CONSULT before performing symptom diagnosis. If any DTC is detected, per-

form the corresponding diagnosis.

1.

CHECK REFRIGERANT CYCLE

Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.

Refer to 

HA-18, "Symptom Table"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace parts depending on the inspection results.

2.

CHECK AIR LEAKAGE FROM EACH DUCT

Check duct and nozzle, etc. of the rear air conditioning system for leakage.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace parts depending on the inspection results.

3.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER (REAR)

1. Check setting value of temperature setting trimmer (rear). Refer to 

HAC-79, "REAR AUTOMATIC AIR

CONDITIONING SYSTEM : Temperature Setting Trimmer (Rear)"

. 

2. Check that temperature setting trimmer (rear) is set to “+ direction”. 

NOTE:

The control temperature can be set with the setting of the temperature setting trimmer (rear).

3. Set difference between set temperature and control temperature to “0”.
Is inspection result normal?

YES

>> Inspection End.

NO

>> Replace A/C auto amp. Refer to 

HAC-157, "Removal and Installation"

.