Infiniti G35 (V35) Sedan. Manual - part 777

HAC-80

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE DOOR MOTOR

INTAKE DOOR MOTOR

Description

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COMPONENT DESCRIPTION

Intake Door Motor

The intake door motor (1) is attached to the blower unit. It rotates so
that air is drawn from inlets set by the unified meter and A/C amp.
Motor rotation is conveyed to a lever which activates the intake door.

Component Function Check

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1.

CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.

Press intake switch.

2.

REC indicator should illuminate.

3.

Listen for intake door position change (Slight change of blower sound can be heard.).

4.

Press intake switch again.

5.

FRE indicator should illuminate.

Is the inspection result normal?

YES

>> END.

NO

>> Go to diagnosis procedure. Refer to 

HAC-80, "Diagnosis Procedure"

.

Diagnosis Procedure

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1.

PERFORM SELF-DIAGNOSIS STEP-2

Perform self-diagnosis STEP-2. Refer to 

HAC-44, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-

TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (Without left and right ventilation tempera-

ture separately control system) or 

HAC-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (With left and right ventilation temperature sepa-

rately control system), see No. 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-44, "WITHOUT LEFT AND RIGHT

VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

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

HAC-50, "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-4

Perform self-diagnosis STEP-4. Refer to 

HAC-44, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-

TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (Without left and right ventilation tempera-

ture separately control system) or 

HAC-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

SEPARATELY CONTROL SYSTEM : Diagnosis Description"

 (With left and right ventilation temperature sepa-

rately control system), see No. 1 to 5.
Is it operated normally?

YES

>> END.

NO

>> GO TO 3.

3.

CHECK INTAKE DOOR CONTROL LINKAGE

:

Vehicle front

JSIIA0007GB

INTAKE DOOR MOTOR

HAC-81

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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HAC

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Check intake door control linkage.

Is it installed normally?

YES

>> GO TO 4.

NO

>> Repair or adjust control linkage.

4.

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

1.

Turn ignition switch ON.

2.

Check voltage between unified meter and A/C amp. harness connector M67 terminal 70 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace unified meter and A/C amp.

5.

CHECK SIGNAL FOR UNIFIED METER AND A/C AMP. 

Confirm A/C LAN signal between unified meter and A/C amp. harness connector M67 terminal 69 and ground
using an oscilloscope.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace unified meter and A/C amp.

6.

CHECK POWER SUPPLY FOR INTAKE DOOR MOTOR

Check voltage between intake door motor harness connector M254 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK SIGNAL FOR INTAKE DOOR MOTOR

Confirm A/C LAN signal between intake door motor harness connector M254 terminal 3 and ground using an
oscilloscope.

(+)

(

−

)

Voltage

Unified meter and A/C amp.

—

Connector

Terminal

M67

70

Ground

Battery voltage

(+)

(

−

)

Voltage

Unified meter and A/C amp.

—

Connector

Terminal

M67

69

Ground

SJIA1453J

(+)

(

−

)

Voltage

Intake door motor

—

Connector

Terminal

M254

1

Ground

Battery voltage

HAC-82

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE DOOR MOTOR

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair harness or connector.

8.

CHECK INTAKE DOOR MOTOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect intake door motor connector.

3.

Check continuity between intake door motor harness connector M254 terminal 2 and ground.

Is the inspection result normal?

YES

>> Replace intake door motor.

NO

>> Repair harness or connector.

(+)

(

−

)

Voltage

Intake door motor

—

Connector

Terminal

M254

3

Ground

SJIA1453J

(+)

(

−

)

Continuity

Intake door motor

—

Connector

Terminal

M254

2

Ground

Continuity should exist

BLOWER MOTOR

HAC-83

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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BLOWER MOTOR

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY
CONTROL SYSTEM

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

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COMPONENT DESCRIPTION

Brush-less Motor

The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness is improved over previous motors where the brush was
the point of contact and the coil rotated.

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : Component Function Check

INFOID:0000000000959941

1.

CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.

Turn fan control dial clockwise. Blower should operate on low speed.

2.

Turn fan control dial clockwise, and continue checking blower speed and fan symbol until all speeds
checked.

Is the inspection result normal?

YES

>> END.

NO

>> Go to diagnosis procedure. Refer to 

HAC-83, "WITHOUT LEFT AND RIGHT VENTILATION TEM-

PERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Procedure"

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

INFOID:0000000000959942

1.

PERFORM SELF-DIAGNOSIS STEP-2

Perform self-diagnosis STEP-2. Refer to 

HAC-44, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-

TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

, see No. 1 to 2.

Is there any malfunction displayed?

YES

>> Go to appropriate malfunctioning sensor circuit. Refer to 

HAC-44, "WITHOUT LEFT AND RIGHT

VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

,

see to No. 11.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS STEP-4

Perform self-diagnosis STEP-4. Refer to 

HAC-44, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-

TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

, see No. 1 to 5.

Does blower motor speed change according to each code No.?

YES

>> GO TO 3.

NO

>> GO TO 5.

ZHA152H

Code  No.

41

42

43

44

45

46

Blower motor duty ratio

37%

91%

65%

91%