Infiniti FX35, FX50 (S51). Manual - part 1167

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

HAC-65

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

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Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper
operation. Refer to 

VTL-5, "System Description"

.

Is this inspection result normal?

YES

>> GO TO 6.

NO-1

>> Air outlet does not change. Refer to 

HAC-70, "Diagnosis Procedure"

.

NO-2

>> Intake door does not change. Refer to 

HAC-78, "WITH ACCS : Diagnosis Procedure"

.

NO-3

>> Discharge air temperature (driver side) does not change. Refer to 

HAC-72, "Diagnosis Proce-

dure"

.

NO-4

>> Discharge air temperature (passenger side) does not change. Refer to 

HAC-74, "Diagnosis Pro-

cedure"

.

NO-5

>> Blower motor operation is malfunctioning. Refer to 

HAC-80, "Diagnosis Procedure"

.

NO-6

>> Magnet clutch does not engage. Refer to 

HAC-84, "Diagnosis Procedure"

.

NO-7

>> Plasmacluster system does not operate. Refer to 

HAC-102, "Diagnosis Procedure"

.

6.

STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED

1.

Turn temperature control dial (driver side) 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 this 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

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 this inspection result normal?

YES

>> GO TO 9.

NO

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

HAC-91, "Diag-

nosis Procedure"

.

9.

CHECK INTAKE SENSOR

Ionizer

ON

ON

ON

ON

ON

OFF

Ion mode

CLEAN

QUICK CLEAN

QUICK CLEAN

QUICK CLEAN

QUICK CLEAN

OFF

Code  No.

41

42

43

44

45

46

PJIA0151E

PJIA0152E

HAC-66

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

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 this 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-49,

"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 motors malfunction.)
(Corresponding code Nos. indicates 0.5 second each if two door motors malfunction.)

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

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-91, "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 (Driver side)

HAC-72, "Diagnosis Procedure"

27 / 

−

27

Air mix door motor PBR (Passenger side)

HAC-74, "Diagnosis Procedure"

28 / 

−

28

Gas sensor

HAC-99, "Diagnosis Procedure"

29 / 

−

29

Harness of gas sensor

SJIA1781E

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

HAC-67

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

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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

WITH ACCS : CONSULT-III Function

INFOID:0000000005246246

CONSULT-III APPLICATION ITEMS

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

DATA MONITOR

Display Item List

Code No. 

*1 *2

Mode or intake door position

Reference

31

VENT

Mode door motor

HAC-70, "Diagnosis Procedure"

32

DEF

37

FRE

Intake door motor

HAC-78, "WITH ACCS : Diagnosis Proce-

dure"

38

20% FRE

39

REC

SJIA1782E

System part

Check item, diagnosis mode

Description

ECM

Data monitor

Displays ECM input data in real time.

Monitor Item

Condition

Value/Status

IGNITION SW

Ignition switch OFF 

→

 ON

Off 

→

 On

HEATER FAN SW

Ignition switch ON

Blower fan motor switch ON

On

Blower fan motor switch OFF

Off

AIR COND SIG

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

HAC-68

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

POWER SUPPLY AND GROUND CIRCUIT

DTC/CIRCUIT DIAGNOSIS

POWER SUPPLY AND GROUND CIRCUIT

UNIFIED METER AND A/C AMP.

UNIFIED METER AND A/C AMP. : Diagnosis Procedure

INFOID:0000000005246247

1.

CHECK FUSE

Check 10A fuses [Nos. 3, 6 and 19, located in the fuse block (J/B)].
NOTE:
Refer to 

PG-156, "Fuse, Connector and Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check harness for short circuit and replace fuse.

2.

CHECK POWER SUPPLY CIRCUIT FOR UNIFIED METER AND A/C AMP.

1.

Disconnect unified meter and A/C amp. connector.

2.

Check voltage between unified meter and A/C amp. harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK GROUND CIRCUIT FOR UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

Check continuity between unified meter and A/C amp. harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

(+)

(

−

)

Voltage

Unified meter and A/C amp.

—

Ignition switch position

Connector

Terminal

OFF

ACC

ON

M67

41

Ground

Approx. 0 V

Battery voltage

Battery voltage

53

Approx. 0 V

Approx. 0 V

Battery voltage

54

Battery voltage

Battery voltage

Battery voltage

Unified meter and A/C amp.

—

Continuity

Connector

Terminal

M67

55

Ground

Existed

71