Infiniti EX35. Manual - part 934

HAC-132

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR CONDITIONER CONTROL

SYMPTOM DIAGNOSIS

AIR CONDITIONER CONTROL

Diagnosis Chart By Symptom

INFOID:0000000003545649

Symptom

Reference

A/C system does not activate.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-104, "Diagnosis Proce-

dure"

A/C system cannot be controlled.

Go to Preset Switch System.

AV-148, "Symptom Table"

 

(BASE AUDIO WITHOUT 

NAVIGATION), 

AV-403, 

"Symptom Table"

 (BOSE AU-

DIO WITHOUT NAVIGATION) 

or 

AV-889, "Symptom Table"

 

(BOSE AUDIO WITH NAVIGA-

TION)

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor. 
(LAN)

HAC-70, "Diagnosis Proce-

dure"

Mode door motor does not operate 
normally.

Discharge air temperature does not 
change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor. 
(LAN)

HAC-73, "WITHOUT LEFT 

AND RIGHT VENTILATION 

TEMPERATURE SEPARATE-

LY CONTROL SYSTEM : Diag-

nosis Procedure"

 (Without left 

and right ventilation tempera-

ture separately control system) 

or 

HAC-75, "WITH LEFT AND 

RIGHT VENTILATION TEM-

PERATURE SEPARATELY 

CONTROL SYSTEM : Diagno-

sis Procedure"

 (With left and 

right ventilation temperature 

separately control system)

Air mix door motor does not operate 
normally.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor. 
(LAN)

HAC-78, "Diagnosis Proce-

dure"

Intake door motor does not operate 
normally.

Blower motor operation is malfunc-
tioning.

Go to Trouble Diagnosis Procedure for Blower Motor.

HAC-81, "WITHOUT LEFT 

AND RIGHT VENTILATION 

TEMPERATURE SEPARATE-

LY CONTROL SYSTEM : Diag-

nosis Procedure"

 (Without left 

and right ventilation tempera-

ture separately control system) 

or 

HAC-84, "WITH LEFT AND 

RIGHT VENTILATION TEM-

PERATURE SEPARATELY 

CONTROL SYSTEM : Diagno-

sis Procedure"

 (With left and 

right ventilation temperature 

separately control system)

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-88, "Diagnosis Proce-

dure"

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-134, "Inspection proce-

dure"

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

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-137, "Inspection proce-

dure"

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

AIR CONDITIONER CONTROL

HAC-133

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-139, "Inspection proce-

dure"

Self-diagnosis cannot be per-
formed.

Go to Trouble Diagnosis Procedure for Self-diagnosis.

HAC-141, "Inspection proce-

dure"

Memory function does not operate.

Go to Trouble Diagnosis Procedure for Memory Function.

HAC-142, "Inspection proce-

dure"

Symptom

Reference

HAC-134

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INSUFFICIENT COOLING

INSUFFICIENT COOLING

Description

INFOID:0000000003545650

Symptom

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

Inspection procedure

INFOID:0000000003545651

1.

CHECK WITH A GAUGE OF RECOVERY/RECYCLING RECHARGING EQUIPMENT

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

Is there refrigerant?

YES

>> GO TO 2.

NO-1

>> Check for refrigerant leakages with the refrigerant leakage detecting fluorescent leak detector.

Refer to 

HA-35, "Inspection"

.

NO-2

>> GO TO 2 after repairing or replacing the parts according to the inspection results.

2.

CHECK CHARGED REFRIGERANT AMOUNT

1.

Connect recovery/recycling recharging equipment to the vehicle and discharge the refrigerant.

2.

Recharge with the proper amount of refrigerant and perform the inspection with the refrigerant leakage
detecting fluorescent leak detector. Refer to 

HA-35, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Refill the refrigerant and repair or replace the parts according to the inspection results.

3.

CHECK REFRIGERANT CYCLE PRESSURE

Connect recovery/recycling recharging equipment to the vehicle and perform the performance test. Refer to

HA-33, "Performance Chart"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Perform the diagnosis with the gauge pressure. Refer to 

HA-7, "Trouble Diagnosis For Unusual

Pressure"

.

4.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER

Check the setting of temperature setting trimmer. Refer to 

HAC-8, "WITHOUT LEFT AND RIGHT VENTILA-

TION TEMPERATURE SEPARATELY CONTROL SYSTEM : Temperature Setting Trimmer"

 (Without left and

right ventilation temperature separately control system) or 

HAC-13, "WITH LEFT AND RIGHT VENTILATION

TEMPERATURE SEPARATELY CONTROL SYSTEM : Temperature Setting Trimmer"

 (With left and right ven-

tilation temperature separately control system).
1.

Check that the temperature setting trimmer is set to “+ direction”. 
NOTE:
The control temperature can be set with the setting of temperature setting trimmer.

2.

Set temperature control dial to “0”.

Are the symptoms solved?

YES

>> Perform the setting separately if necessary. END.

NO

>> GO TO 5.

5.

PERFORM SELF-DIAGNOSIS STEP-2

Perform self-diagnosis STEP-2. Refer to 

HAC-57, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-

TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (Without left and right ventilation tempera-

ture separately control system) or 

HAC-63, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (With left and right ventilation temperature sepa-

rately control system), see Nos. 1 to 2.

Does code No. 20 appear on the display?

YES

>> GO TO 6.

INSUFFICIENT COOLING

HAC-135

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

NO

>> Go to appropriate malfunctioning sensor circuit. Refer to 

HAC-57, "WITHOUT LEFT AND RIGHT

VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

(Without left and right ventilation temperature separately control system) or 

HAC-63, "WITH LEFT

AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis
Description"

 (With left and right ventilation temperature separately control system), see No. 11.

6.

PERFORM SELF-DIAGNOSIS STEP-4

Perform self-diagnosis STEP-4. Refer to 

HAC-57, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-

TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (Without left and right ventilation tempera-

ture separately control system) or 

HAC-63, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (With left and right ventilation temperature sepa-

rately control system), see Nos.1 to 5.
Is it operated normally?

YES

>> GO TO 7.

NO

>> Perform the diagnosis applicable to each output device. 

7.

PERFORM SELF-DIAGNOSIS STEP-5

Perform self-diagnosis STEP-5. Refer to 

HAC-57, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-

TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (Without left and right ventilation tempera-

ture separately control system) or 

HAC-63, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (With left and right ventilation temperature sepa-

rately control system), see Nos.1 to 10.
Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Go to appropriate malfunctioning sensor circuit. Refer to 

HAC-57, "WITHOUT LEFT AND RIGHT

VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

(Without left and right ventilation temperature separately control system) or 

HAC-63, "WITH LEFT

AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis
Description"

 (With left and right ventilation temperature separately control system).

8.

CHECK DRIVE BELT

Check tension of the drive belt. Refer to 

EM-13, "Checking"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Adjust or replace drive belt.

9.

CHECK AIR LEAKAGE FROM DUCT

Check duct and nozzle, etc. of A/C system for air leakage.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair or replace parts according to the inspection results.

10.

CHECK POWER SUPPLY FOR ECV (ELECTRIC CONTROL VALVE)

1.

Disconnect compressor (ECV) connector.

2.

Turn ignition switch ON.

3.

Check voltage between compressor (ECV) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 11.

11.

CHECK FUSE

(+)

(

−

)

Voltage

Compressor (ECV)

—

Connector

Terminal

F44

2

Ground

Battery voltage