Infiniti G35 (V35) Sedan. Manual - part 768

HAC-44

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (AUTO AMP.)

DIAGNOSIS SYSTEM (AUTO AMP.)

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY
CONTROL SYSTEM

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : Diagnosis Description

INFOID:0000000000959917

SELF-DIAGNOSIS SYSTEM

The self-diagnosis system is built into the unified meter and A/C amp. to quickly locate the cause of malfunc-
tions.

SELF-DIAGNOSIS FUNCTION

The self-diagnosis system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from normal control to the self-diagnosis system is accomplished by
starting the engine (turning the ignition switch ON) and pressing OFF switch for at least 5 seconds. The OFF
switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system
will be canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step is
accomplished by means of turning temperature control dial, as required.

DIAGNOSIS SYSTEM (AUTO AMP.)

HAC-45

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of turning fan control dial clock-
wise.

CONFORMATION METHOD

1.

SET IN SELF-DIAGNOSIS MODE

1.

Turn ignition switch ON.

2.

Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.

NOTE:
• If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a

result, the system may generate an error even when operation is normal. To avoid this, start engine before
performing this diagnosis.

• Former STEP-1 (LEDs and display screen are checked) does not exist in this self-diagnosis function.
• OFF switch may not be recognized according to the timing of pressing it. Operate OFF switch after turning

the intake switch LEDs (REC/FRE) ON.

>> GO TO 2.

2.

STEP-2: SENSOR AND DOOR MOTOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT

JSIIA0119GB

HAC-46

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (AUTO AMP.)

Does code No. 20 appear on the display?

YES

>> GO TO 3.

NO

>> GO TO 11.

3.

STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED

Turn temperature control dial clockwise.

Does code No. 30 appear on the display?

YES

>> GO TO 4.

NO

>> GO TO 12.

4.

STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED

1.

Turn temperature control dial clockwise.

2.

Press 

 (DEF) switch. Code No. of each door motor test is

indicated on the display.

>> GO TO 5.

5.

CHECK ACTUATORS

Refer to the following chart and check discharge air flow, air temperature, blower motor duty ratio and com-
pressor operation.
Without rear ventilation

SJIA1778E

SJIA1779E

SJIA1780E

JSIIA0242GB

DIAGNOSIS SYSTEM (AUTO AMP.)

HAC-47

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

With rear ventilation

Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper
operation.
Is the inspection result normal?

YES

>> GO TO 6.

NO-1

>> Air outlet does not change. Go to Mode Door Motor Circuit. Refer to 

HAC-69, "Diagnosis Proce-

dure"

.

NO-2

>> Intake door does not change. Go to Intake Door Motor Circuit. Refer to 

HAC-80, "Diagnosis Pro-

cedure"

.

NO-3

>> Discharge air temperature does not change. Go to Air Mix Door Motor Circuit. Refer to 

HAC-72,

"WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYS-
TEM : Diagnosis Procedure"

.

NO-4

>> Blower motor operation is malfunctioning. Go to Blower Motor Circuit. Refer to 

HAC-83, "WITH-

OUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM :
Diagnosis Procedure"

.

NO-5

>> Magnet clutch does not engage. Go to Magnet Clutch Circuit. Refer to 

HAC-90, "Diagnosis Proce-

dure"

.

6.

STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED

1.

Turn temperature control dial clockwise.

2.

Code No. 51 appears on the display.

>> GO TO 7.

7.

CHECK AMBIENT SENSOR

JSIIA0243GB

Code  No.

41

42

43

44

45

46

Mode door position

VENT

B/L 1

B/L 2

FOOT

D/F

DEF

Intake door position

REC

REC

20% FRE

FRE

FRE

FRE

Air mix door position

FULL COOL

FULL COOL

FULL HOT

FULL HOT

FULL HOT

FULL HOT

Blower motor duty ratio

37%

91%

65%

65%

65%

91%

Compressor

ON

ON

OFF

OFF

ON

ON

Electronic control valve 
(ECV) duty ratio

100%

100%

0%

0%

50%

100%