Infiniti EX35. Manual - part 918

HAC-68

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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

*: 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

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 LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL 

Code No.

Malfunctioning sensor and door motor (Including circuits)

Reference

21 / 

−

21

Ambient sensor

HAC-91, "Diagnosis Procedure"

22 / 

−

22

In-vehicle sensor

HAC-95, "Diagnosis Procedure"

24 / 

−

24

Intake sensor

HAC-100, "Diagnosis Procedure"

25 / 

−

25

Sunload sensor 

*

HAC-97, "Diagnosis Procedure"

26 / 

−

26

Air mix door motor PBR (Driver side)

HAC-75, "WITH LEFT AND RIGHT VENTILA-

TION TEMPERATURE SEPARATELY CON-

TROL SYSTEM : Diagnosis Procedure"

27 / 

−

27

Air mix door motor PBR (Passenger side)

SJIA1781E

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, "Diagnosis Procedure"

38

20% FRE

39

REC

SJIA1782E

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

HAC-69

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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F

G

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J

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A

B

HAC

N

O

P

SYSTEM : CONSULT-III Function

INFOID:0000000003545588

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

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-70

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

COMPONENT DIAGNOSIS

MODE DOOR MOTOR

Description

INFOID:0000000003545603

COMPONENT DESCRIPTION

Mode Door Motor

The mode door motor (1) are attached to the heater & cooling unit
assembly. It rotates so that air is discharged from the outlet set by
the unified meter and A/C amp. Motor rotation is conveyed to a link
which activates the mode door.

Component Function Check

INFOID:0000000003545604

1.

CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.

Press MODE switch(es) and DEF switch.

2.

Each position indicator should change shape.

3.

Confirm that discharge air comes out according to the air distribution table at below. Refer to 

HAC-26,

"WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM :
System Description"

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

HAC-35,

"WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : System
Description"

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

NOTE:
Confirm that the compressor clutch is engaged (Sound or visual inspection) and intake door position is at FRE
when DEF 

 or D/F 

 is selected.

Is the inspection result normal?

YES

>> END.

NO

>> Go to diagnosis procedure. Refer to 

HAC-70, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003545605

1.

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 2.

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.

2.

PERFORM SELF-DIAGNOSIS STEP-3

Perform self-diagnosis STEP-3. 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) 

HAC-63, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

:

Vehicle front

JSIIA0005GB

MODE DOOR MOTOR

HAC-71

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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HAC

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SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (With left and right ventilation temperature sepa-

rately control system), see Nos. 1 to 3.
Does code No. 30 appear on the display?

YES

>> GO TO 6.

NO-1

>> Code No. 31 or 32 appear on the display: GO TO 3.

NO-2

>> Code No. 37, 38 or 39 appear on the display: Go to Intake Door Motor Circuit. Refer to 

HAC-78,

"Diagnosis Procedure"

.

3.

CHECK POWER SUPPLY FOR MODE DOOR MOTOR

Check voltage between mode door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK SIGNAL FOR MODE DOOR MOTOR

Confirm A/C LAN signal between mode door motor harness connector and ground using an oscilloscope.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

5.

CHECK MODE DOOR MOTOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect mode door motor connector.

3.

Check continuity between mode door motor harness connector and ground.

Is the inspection result normal?

YES

>> Replace mode door motor.

NO

>> Repair harness or connector.

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) 

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.

(+)

(

−

)

Voltage

Mode door motor

—

Connector

Terminal

M253

1

Ground

Battery voltage

(+)

(

−

)

Voltage

Mode door motor

—

Connector

Terminal

M253

3

Ground

SJIA1453J

Mode door motor

—

Continuity

Connector

Terminal

M253

2

Ground

Existed