Nissan Cube. Manual - part 554

HAC-54

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

BLOWER MOTOR

BLOWER MOTOR

Description

INFOID:0000000009951000

BLOWER MOTOR

• The blower motor is installed in the RH side of A/C unit assembly.
• The blower motor adopts the forcible air cooling system and one-

touch installation system without any screws.

POWER TRANSISTOR

• The power transistor attached to A/C unit assembly.

• The power transistor controls the transmitting voltage to blower

motor base on the gate voltage from A/C auto amp.

• The power transistor is set for low voltage drop, therefore it dose

not require high relay while transmitting max voltage to blower
motor.

Component Function Check

INFOID:0000000009951001

1.

CHECK OPERATION

1.

Warm up the engine.

2.

Operate the fan control switch. Check that the fan speed and indicator unit are switched for all fan speeds. 

Does it operate normally?

YES

>> INSPECTION END

NO

>> Perform the diagnosis for the blower motor. Refer to 

HAC-54, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009951002

1.

CHECK FUSE

Check 15A fuses [Nos. 15 and 17, located in the fuse block (J/B)].
NOTE:
Refer to 

PG-77, "Fuse, Connector and Terminal Arrangement"

.

Is inspection result normal?

JPIIA1575ZZ

JPIIA1634ZZ

JPIIA1660GB

BLOWER MOTOR

HAC-55

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

YES

>> GO TO 2.

NO

>> Replace the corresponding fuse.

2.

CHECK POWER SUPPLY OF BLOWER MOTOR

1.

Turn the ignition switch OFF.

2.

Disconnect the blower motor connector. 

3.

Turn the ignition switch ON.

4.

Check voltage between blower motor harness connector and the ground. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK BLOWER MOTOR RELAY

1.

Turn the ignition switch OFF.

2.

Check the blower motor relay. Refer to 

HAC-57, "Component Inspection"

.

Is inspection result normal?

YES

>> Repair the harness or connector between blower motor and fuse.

NO

>> Replace the blower motor relay.

4.

CHECK VOLTAGE BETWEEN POWER TRANSISTOR AND GROUND

1.

Connect the blower motor connector.

2.

Disconnect the power transistor connector.

3.

Turn the ignition switch ON.

4.

Check voltage between power transistor harness connector and the ground.

Is inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK CONTINUITY BETWEEN BLOWER MOTOR AND POWER TRANSISTOR

1.

Turn the ignition switch OFF.

2.

Disconnect the blower motor connector.

3.

Check continuity between blower motor harness connector and power transistor harness connector. 

Is the inspection result normal?

YES

>> Replace the blower motor.

NO

>> Repair the harnesses or connectors.

6.

CHECK VOLTAGE BETWEEN POWER TRANSISTOR AND GROUND

Check voltage between power transistor harness connector and the ground.

(+)

(

−

)

Voltage

(Approx.)

Blower motor

—

Connector

Terminal

M39

1

Ground

Battery voltage

(+)

(

−

)

Voltage

(Approx.)

Blower motor

—

Connector

Terminal

M82

1

Ground

Battery voltage

Blower motor

Power transistor

Continuity

Connector

Terminal

Connector

Terminal

M39

2

M82

1

Existed

HAC-56

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

BLOWER MOTOR

Is inspection result normal?

YES

>> GO TO 7.

NO

>> Replace the harness or connector between power transistor and fuse.

7.

CHECK CONTINUITY BETWEEN POWER TRANSISTOR AND GROUND

Check continuity between power transistor harness connector and the ground. 

Is inspection result normal?

YES

>> GO TO 8.

NO

>> Repair the harnesses or connectors.

8.

CHECK A/C AUTO AMP. OUTPUT SIGNAL

1.

Connect the blower motor connector and the A/C auto amp. connector. 

2.

Turn the ignition switch ON.

3.

Set the mode position to VENT. 

4.

Change fan speed from Lo to Hi, and check duty ratios between blower motor harness connector and the
ground by using an oscilloscope. 
NOTE:
Calculate the drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 9.

9.

CHECK CONTINUITY BETWEEN POWER TRANSISTOR AND A/C AUTO AMP.

1.

Turn the ignition switch OFF.

2.

Disconnect the power transistor connector.

3.

Disconnect the A/C auto amp. connector.

4.

Check continuity between power transistor harness connector and A/C auto amp. harness connector.

(+)

(

−

)

Voltage

(Approx.)

Power transistor

—

Connector

Terminal

M82

4

Ground

Battery voltage

Blower motor

—

Continuity

Connector

Terminal

M82

3

Ground

Existed

(+)

(

−

)

Condition

Duty ratio

(Approx.)

Output waveform

Blower motor

—

Connector

Terminal

Fan speed (manual, 

VENT mode)

M82

2

Ground

1st

26%

2nd

34%

3rd

41%

4th

51%

5th

62%

6th

73%

7th

82%

JPIIA1646GB

BLOWER MOTOR

HAC-57

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> Replace the A/C auto amp.

NO

>> Repair the harnesses or connectors. 

10.

CHECK CONTINUITY POWER TRANSISTOR SUB HARNESS

Check the sub harness continuity with the following figure. 

Is the inspection result normal?

YES

>> Replace the power transistor.

NO

>> Repair the harnesses or connectors.

Component Inspection

INFOID:0000000009951003

BLOWER MOTOR

1.

CHECK BLOWER MOTOR

1.

Remove the blower motor. Refer to 

VTL-13, "Exploded View"

. 

2.

Check that there is not any mixing foreign object in the blower motor. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blower motor.

2.

CHECK BLOWER MOTOR

Check that there is not breakage or damage in the blower motor. 
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace the blower motor.

3.

CHECK BLOWER MOTOR

Check that the blower motor turns smoothly. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the blower motor.

BLOWER MOTOR RELAY

Power transistor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M82

2

M51

36

Existed

JPIIA1746GB