Infiniti FX35, FX50 (S51). Manual - part 1170

INTAKE DOOR MOTOR

HAC-77

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

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 and ground.

Is the inspection result normal?

YES

>> Replace intake door motor.

NO

>> Repair harness or connector.

5.

CHECK INTAKE DOOR CONTROL LINKAGE

Check intake door control linkage is properly installed. Refer to 

HAC-187, "Exploded View"

.

Is it installed normally?

YES

>> INSPECTION END

NO

>> Repair or adjust control linkage.

WITH ACCS

WITH ACCS : Description

INFOID:0000000005246263

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.

WITH ACCS : Component Function Check

INFOID:0000000005246264

1.

CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.

Press AUTO switch. AUTO INTAKE indicator and REC indicator turns ON (auto intake mode).

(+)

(

−

)

Voltage

Intake door motor

—

Connector

Terminal

M254

3

Ground

SJIA1453J

Intake door motor

—

Continuity

Connector

Terminal

M254

2

Ground

Existed

:

Vehicle front

JSIIA0007GB

HAC-78

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE DOOR MOTOR

2.

Press intake switch. AUTO INTAKE indicator and REC indicator turns OFF (fixed FRE mode).

3.

Press intake switch again. REC indicator turns ON (fixed REC mode).

4.

Press intake switch again. AUTO INTAKE indicator and REC indicator turns ON (auto intake mode).

5.

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

NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and the intake door position is at
FRE when D/F or DEF is selected.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to diagnosis procedure. Refer to 

HAC-78, "WITH ACCS : Diagnosis Procedure"

.

WITH ACCS : Diagnosis Procedure

INFOID:0000000005246265

1.

PERFORM SELF-DIAGNOSIS

Perform self-diagnosis function. Refer to 

HAC-62, "WITH ACCS : Diagnosis Description"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY FOR INTAKE DOOR MOTOR

Check voltage between intake door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK SIGNAL FOR INTAKE DOOR MOTOR

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

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 and ground.

(+)

(

−

)

Voltage

(Approx.)

Intake door motor

—

Connector

Terminal

M254

1

Ground

12 V

(+)

(

−

)

Voltage

Intake door motor

—

Connector

Terminal

M254

3

Ground

SJIA1453J

INTAKE DOOR MOTOR

HAC-79

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> Replace intake door motor.

NO

>> Repair harness or connector.

5.

CHECK INTAKE DOOR CONTROL LINKAGE

Check intake door control linkage is properly installed. Refer to 

HAC-187, "Exploded View"

.

Is it installed normally?

YES

>> INSPECTION END

NO

>> Repair or adjust control linkage.

Intake door motor

—

Continuity

Connector

Terminal

M254

2

Ground

Existed

HAC-80

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR

BLOWER MOTOR

Description

INFOID:0000000005246266

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.

Component Function Check

INFOID:0000000005246267

1.

CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.

Press fan (UP: +) switch. Blower should operate on low speed.

2.

Press fan (UP: +) switch, and continue checking blower speed and fan symbol until all speeds checked.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to diagnosis procedure. Refer to 

HAC-80, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005246268

1.

PERFORM SELF-DIAGNOSIS

Perform self-diagnosis function STEP-4. Refer to 

HAC-57, "WITHOUT ACCS : Diagnosis Description"

 (WITH-

OUT ACCS) or 

HAC-62, "WITH ACCS : Diagnosis Description"

 (WITH ACCS).

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

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY FOR BLOWER MOTOR

1.

Disconnect blower motor connector.

2.

Turn ignition switch ON.

3.

Check voltage between blower motor harness connector and ground.

RJIA2467J

ZHA152H

Code  No.

41

42

43

44

45

46

Blower motor duty ratio

37%

91%

65%

91%