Infiniti G35 (V35) Sedan. Manual - part 769

HAC-48

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (AUTO AMP.)

Press 

 (DEF) switch one time. Temperature detected by ambient

sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.
Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Go to Ambient Sensor Circuit. Refer to 

HAC-93, "Diag-

nosis Procedure"

.

8.

CHECK IN-VEHICLE SENSOR

Press 

 (DEF) switch for the second time. Temperature detected

by in-vehicle sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Go to In-vehicle Sensor Circuit. Refer to 

HAC-97, "Diag-

nosis Procedure"

.

9.

CHECK INTAKE SENSOR

Press 

 (DEF) switch for the third time. Temperature detected by

intake sensor is indicated on the display.
NOTE:
If the temperature indicated on the display greatly differs from the
actual temperature, check sensor circuit first, and then check sensor.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Go to Intake Sensor Circuit. Refer to 

HAC-102, "Diagno-

sis Procedure"

.

10.

CHECK CAN COMMUNICATION ERROR

1.

Press intake switch.

2.

CAN communication error between each unit that uses the uni-
fied meter and A/C amp. can be detected as self-diagnosis
results. (If plural errors occur, the display of each error will blink
twice for 0.5 second intervals.)

Is the inspection result normal?

YES

>> INSPECTION END

NO

>>

Go to CAN communication. Refer to 

MWI-40,

"Diagnosis Procedure"

.

• Unified meter and A/C amp. - AV control unit

11.

CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR

Refer to the following chart for malfunctioning code No.
(If two or more sensors and door motor malfunction, corresponding code Nos. indicates 1 second each.)

PJIA0151E

PJIA0152E

PJIA0153E

JSIIA0138GB

Code No.

Malfunctioning sensor and door motor (Including circuits)

Reference page

21 / 

−

21

Ambient sensor

HAC-93, "Diagnosis Procedure"

22 / 

−

22

In-vehicle sensor

HAC-97, "Diagnosis Procedure"

 

DIAGNOSIS SYSTEM (AUTO AMP.)

HAC-49

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

*: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code No. 25 will indicate
despite that sunload sensor is functioning properly.

>> INSPECTION END

12.

CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH

Mode and/or intake door motor PBR(s) is/are malfunctioning.

(If two or more mode or intake door motors malfunction, corresponding code Nos. indicates 1 second each.)
*1: If mode door motor harness connector is disconnected, the following display pattern will appear.
31

→

32

→

Return to 31

*2: If intake door motor harness connector is disconnected, the following display pattern will appear.
37

→

38

→

39

→

Return to 37

>> INSPECTION END

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : CONSULT-III Function

INFOID:0000000000959918

CONSULT-III APPLICATION ITEMS

CONSULT-III can display each diagnosis item using the diagnosis test modes shown following.

24 / 

−

24

Intake sensor

HAC-102, "Diagnosis Procedure"

25 / 

−

25

Sunload sensor 

*

HAC-99, "Diagnosis Procedure"

26 / 

−

26

Air mix door motor PBR

HAC-72, "WITHOUT LEFT AND RIGHT VEN-

TILATION TEMPERATURE SEPARATELY 

CONTROL SYSTEM : Diagnosis Procedure"

Code No.

Malfunctioning sensor and door motor (Including circuits)

Reference page

SJIA1781E

Code No. 

*1 *2

Mode or intake door position

Reference page

31

VENT

Mode door motor

HAC-69, "Diagnosis Procedure"

32

DEF

37

FRE

Intake door motor

HAC-80, "Diagnosis Procedure"

38

20% FRE

39

REC

SJIA1782E

HAC-50

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (AUTO AMP.)

DATA MONITOR

Display Item List

WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM

WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL 
SYSTEM : Diagnosis Description

INFOID:0000000000959919

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 (driver side), as required.

System part

Check item, diagnosis mode

Description

ECM

Data monitor

Displays ECM input data in real time.

Monitor Item

Condition

Value/Status

IGN ON SW

Ignition switch OFF 

→

 ON

OFF 

→

 ON

FAN ON SIG

Ignition switch ON

Blower fan motor switch ON

ON

Blower fan motor switch OFF

OFF

AIR COND SW

Ignition switch ON

Compressor ON

ON

Compressor OFF

OFF

REFRIGERANT PRESSURE 
SENSOR

• Engine is running
• Warm-up condition
• Both A/C switch and blower fan motor switch: ON (Compressor 

operates)

1.0 - 4.0 V

DIAGNOSIS SYSTEM (AUTO AMP.)

HAC-51

< 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 pressing fan (UP:+) switch.

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

JSIIA0059GB