Infiniti G37 Coupe. Manual - part 764

 

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Infiniti G37 Coupe. Manual - part 764

 

 

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

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-67, "Diagnosis Proce-

dure"

.

NO-2

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

HAC-75, "Diagnosis Pro-

cedure"

.

NO-3

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

HAC-70,

"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-77, "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-85, "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

Press DEF (

) switch one time. Temperature detected by ambient

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

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Go to Ambient Sensor Circuit. Refer to 

HAC-88, "Diag-

nosis Procedure"

.

8.

CHECK IN-VEHICLE SENSOR

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 (Magnet 
clutch)

ON

ON

OFF

OFF

ON

ON

Electronic control valve 
(ECV) duty ratio

100%

100%

0%

0%

50%

100%

PJIA0151E

HAC-46

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (AUTO AMP.)

Press DEF (

) switch for the second time. Temperature detected

by in-vehicle sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display
greatly differs from the actual temperature, and then check sensor.
Is the inspection result normal?

YES

>> GO TO 9.

NO

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

HAC-92, "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:
Check sensor circuit first if the temperature indicated on the display
greatly differs from the actual temperature, and then check sensor.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Go to Intake Sensor Circuit. Refer to 

HAC-97, "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. (The display of each error will blink twice for 0.5 second
intervals if plural errors occur.)

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to CAN communication (Unified meter and A/C amp.

- AV control unit). Refer to 

MWI-41,

"Diagnosis Procedure"

.

11.

CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR

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

*: Perform self-diagnosis STEP-2 under sunshine.

PJIA0152E

PJIA0153E

JSIIA0138GB

Code No.

Malfunctioning sensor and door motor (Including circuits)

Reference

21 / 

21

Ambient sensor

HAC-88, "Diagnosis Procedure"

22 / 

22

In-vehicle sensor

HAC-92, "Diagnosis Procedure"

24 / 

24

Intake sensor

HAC-97, "Diagnosis Procedure"

25 / 

25

Sunload sensor 

*

HAC-94, "Diagnosis Procedure"

26 / 

26

Air mix door motor PBR

HAC-70, "WITHOUT LEFT AND RIGHT VEN-

TILATION TEMPERATURE SEPARATELY 

CONTROL SYSTEM : Diagnosis Procedure"

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

When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code No. 25 indicates
despite that sunload sensor is functioning normally.

>> INSPECTION END

12.

CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH

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

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

32

Return to 31

*2: The following display pattern will appear if intake door motor harness connector is disconnected.
37

38

39

Return to 37

>> INSPECTION END

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

INFOID:0000000001675683

CONSULT-III APPLICATION ITEMS

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

DATA MONITOR

SJIA1781E

Code No. 

*1 *2

Mode or intake door position

Reference

31

VENT

Mode door motor

HAC-67, "Diagnosis Procedure"

32

DEF

37

FRE

Intake door motor

HAC-75, "Diagnosis Procedure"

38

20% FRE

39

REC

SJIA1782E

System part

Check item, diagnosis mode

Description

ECM

Data monitor

Displays ECM input data in real time.

HAC-48

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (AUTO AMP.)

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:0000000001675684

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
is 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.

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

 

 

 

 

 

 

 

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