Infiniti EX35. Manual - part 921

HAC-80

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR

BLOWER MOTOR

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY
CONTROL SYSTEM

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

INFOID:0000000003545615

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.

Blower motor circuit

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

INFOID:0000000003545616

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.

RJIA2467J

ZHA152H

RJIA4071E

BLOWER MOTOR

HAC-81

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

NO

>> Go to diagnosis procedure. Refer to 

HAC-81, "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:0000000003545617

1.

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"

, see Nos. 1 to 5.

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

YES

>> 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.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 6.

3.

CHECK BLOWER MOTOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between blower motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND UNIFIED METER AND A/C AMP.

1.

Disconnect unified meter and A/C amp. connector.

2.

Check continuity between blower motor harness connector and unified meter and A/C amp. harness con-
nector.

3.

Check continuity between blower motor harness connector and ground.

Code  No.

41

42

43

44

45

46

Blower motor duty ratio

37%

91%

65%

91%

(+)

(

−

)

Voltage

Blower motor

—

Connector

Terminal

M109

1

Ground

Battery voltage

blower motor

—

Continuity

Connector

Terminal

M109

3

Ground

Existed

blower motor

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

M109

2

M66

38

Existed

HAC-82

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

5.

CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL

1.

Reconnect blower motor connector and unified meter and A/C amp. connector.

2.

Turn ignition switch ON.

3.

Set MODE switch to VENT position.

4.

Change fan speed from Lo to Hi, and check duty ratios between blower motor harness connector and
ground by using an oscilloscope. Normal terminal 2 drive signal duty ratios are shown in the table below.

Is the inspection result normal?

YES

>> Replace blower motor after confirming the fan air flow does not change.

NO

>> Replace unified meter and A/C amp.

6.

CHECK POWER VOLTAGE OF BLOWER RELAY

1.

Turn ignition switch OFF.

2.

Remove blower relay. Refer to 

PG-98, "Fuse, Connector and Terminal Arrangement"

.

3.

Turn ignition switch ON.

4.

Check the voltage between blower relay fuse block terminals and ground. Refer to 

PG-96, "Description"

for relay terminal assignment.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Check ignition power supply circuit. Refer to 

PG-51, "Wiring Diagram - IGNITION POWER SUP-

PLY -"

.

7.

CHECK BLOWER RELAY

1.

Turn ignition switch OFF.

2.

Install blower relay. Refer to 

PG-98, "Fuse, Connector and Terminal Arrangement"

.

3.

Check operation sound of the blower relay after switching ignition switch ON.

blower motor

—

Continuity

Connector

Terminal

M109

2

ground

Not existed

JSIIA0068GB

(+)

(

−

)

Voltage

Blower relay

—

1

Ground

Battery voltage

3

BLOWER MOTOR

HAC-83

< COMPONENT 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 8.

NO

>> Replace blower relay.

8.

CHECK FUSE

Check fuse 15A [Nos 21 and 22, located in the fuse block (J/B). Refer to 

PG-98, "Fuse, Connector and Termi-

nal Arrangement"

.

Is the inspection result normal?

YES

>> Repair harness or connector.

NO

>> Be sure to eliminate cause of malfunction before installing new fuse.

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

INFOID:0000000003545618

1.

CHECK BLOWER MOTOR

1.

Remove blower motor (1). Refer to 

VTL-33, "Exploded View"

.

2.

Confirm smooth rotation of the blower motor.

Is the inspection result normal?

YES

>> END.

NO

>> Replace blower motor.

WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM

WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL 
SYSTEM : Description

INFOID:0000000003545619

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.

JSIIA1074ZZ

RJIA2467J