Infiniti G35 (V35) Sedan. Manual - part 778

HAC-84

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR

3.

CHECK ENGINE COOLANT TEMPERATURE

Check engine coolant temperature.
Is engine coolant temperature below 56

°

C (133

°

F)?

YES

>> GO TO 4.

NO

>> Blower motor operation is normal.

4.

CHECK BLOWER MOTOR OPERATING

Check blower motor operating.

Is blower motor operation under starting blower speed control?

YES

>> END.

NO

>> GO TO 5.

5.

CHECK POWER SUPPLY FOR BLOWER MOTOR

1.

Disconnect blower motor connector.

2.

Turn ignition switch ON.

3.

Check voltage between blower motor harness connector M109 terminal 1 and ground.

Is the inspection result normal?

OK

>> GO TO 6.

NG

>> GO TO 9.

6.

CHECK BLOWER MOTOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between blower motor harness connector M109 terminal 3 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

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 M109 terminal 2 and unified meter and A/C
amp. harness connector M66 terminal 38.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair harness or connector.

8.

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.

(+)

(

−

)

Voltage

Blower motor

—

Connector

Terminal

M109

1

Ground

Battery voltage

(+)

(

−

)

Continuity

blower motor

—

Connector

Terminal

M109

3

Ground

Continuity should exist

(+)

(

−

)

Continuity

blower motor

Unified meter and A/C amp.

Connector

Terminal

Connector

Terminal

M109

2

M66

38

Continuity should exist

BLOWER MOTOR

HAC-85

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

3.

Set MODE switch to VENT position.

4.

Change fan speed from Lo to Hi, and check duty ratios between blower motor harness connector M109
terminal 2 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.

9.

CHECK POWER VOLTAGE OF BLOWER FAN MOTOR

1.

Turn ignition switch OFF.

2.

Remove blower fan motor relay. Refer to 

PG-93, "Fuse, Connector and Terminal Arrangement"

.

3.

Turn ignition switch ON.

4.

Check the voltage between blower fan motor relay fuse block terminals 1, 3 and body ground. Refer to

PG-91, "Description"

 for relay terminal assignment.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 10.

10.

CHECK IGNITION SWITCH

Check ignition switch.
Is the inspection result normal?

YES

>> Repair harness or connector.

NG

>> Replace ignition switch.

11.

CHECK BLOWER FAN MOTOR RELAY

1.

Turn ignition switch OFF.

2.

Install blower fan motor relay. Refer to 

PG-93, "Fuse, Connector and Terminal Arrangement"

.

3.

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

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace blower fan motor relay.

12.

CHECK FUSE

JSIIA0068GB

(+)

(

−

)

Voltage

Blower fan motor relay

—

 Fuse block terminal

1

Ground

Battery voltage

3

HAC-86

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR

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

PG-93, "Fuse, Connector and Termi-

nal Arrangement"

.

Is the inspection result normal?

YES

>> Repair harness or connector.

NG

>> Replace fuse.

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

INFOID:0000000000959943

Confirm smooth rotation of the blower motor (1).

WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM

WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL 
SYSTEM : Description

INFOID:0000000000959944

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.

WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL 
SYSTEM : Component Function Check

INFOID:0000000000959945

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

>> END.

NO

>> Go to diagnosis procedure. Refer to 

HAC-86, "WITH LEFT AND RIGHT VENTILATION TEMPER-

ATURE SEPARATELY CONTROL SYSTEM : Diagnosis Procedure"

.

WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL 
SYSTEM : Diagnosis Procedure

INFOID:0000000000959946

1.

PERFORM SELF-DIAGNOSIS STEP-2

JSIIA0044ZZ

ZHA152H

BLOWER MOTOR

HAC-87

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Perform self-diagnosis STEP-2. Refer to 

HAC-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

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-50, "WITH LEFT AND RIGHT VEN-

TILATION 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-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

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.

3.

CHECK ENGINE COOLANT TEMPERATURE

Check engine coolant temperature.

Is engine coolant temperature below 56

°

C (133

°

F)?

YES

>> GO TO 4.

NO

>> Blower motor operation is normal.

4.

CHECK BLOWER MOTOR OPERATING

Check blower motor operating.
Is blower motor operation under starting blower speed control?

YES

>> END.

NO

>> GO TO 5.

5.

CHECK POWER SUPPLY FOR BLOWER MOTOR

1.

Disconnect blower motor connector.

2.

Turn ignition switch ON.

3.

Check voltage between blower motor harness connector M109 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 9.

6.

CHECK BLOWER MOTOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between blower motor harness connector M109 terminal 3 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

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

(+)

(

−

)

Continuity

blower motor

—

Connector

Terminal

M109

3

Ground

Continuity should exist