Nissan Juke F15. Manual - part 861

BLOWER FAN ON SIGNAL

HAC-79

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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BLOWER FAN ON SIGNAL

Component Function Check

INFOID:0000000012200067

1.

CHECK BLOWER FAN ON SIGNAL

With CONSULT

1. Turn ignition switch ON.

2. Select “AIR CONDITIONER” of “BCM” using CONSULT.

3. Select “FAN ON SIG” in “DATA MONITOR” mode.

4. Check blower fan ON signal when the fan control dial is operated.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Refer to 

HAC-79, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000012200068

1.

CHECK BLOWER FAN ON SIGNAL

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. harness connector.

3. Turn ignition switch ON.

4. Check output waveform between A/C auto amp. and ground with using oscilloscope.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-93, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect BCM connector.

3. Check continuity A/C auto amp. harness connector and BCM harness connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR SHORT

Monitor item

Condition

Status

FAN ON SIG

Blower motor

ON

On

OFF

OFF

+

−

Output waveform

A/C auto amp.

Connector

Terminal

M50

14

Ground

PKIB4960J

A/C auto amp.

BCM

Continuity

Connector

Terminal

Connector

Terminal

M50

14

M68

28

Existed

HAC-80

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

BLOWER FAN ON SIGNAL

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

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-94, "Removal and Installation"

.

NO

>> Repair harness or connector.

A/C auto amp.

—

Continuity

Connector

Terminal

M50

14

Ground

Not existed

BLOWER MOTOR

HAC-81

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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BLOWER MOTOR

Diagnosis Procedure

INFOID:0000000012200069

1.

CHECK FUSE

1. Turn ignition switch OFF.

2. Check following fuses.

-

10A fuse [No. 15, located in fuse block (J/B)]

-

15A fuses [Nos. 14 and 16, located in fuse block (J/B)]

NOTE:

Refer to 

PG-80, "Fuse, Connector and Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

2.

CHECK BLOWER MOTOR POWER SUPPLY

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 4.

NO

>> GO TO 3.

3.

CHECK BLOWER RELAY

1. Turn ignition switch OFF.

2. Check blower relay. Refer to 

HAC-84, "Component Inspection (Blower Relay)"

.

Is the inspection result normal?

YES

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

NO

>> Replace blower relay.

4.

CHECK BLOWER MOTOR CONTROL CIRCUIT

1. Turn ignition switch OFF.

2. Connect blower motor connector.

3. Disconnect power transistor connector.

4. Turn ignition switch ON.

5. Check voltage between power transistor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK BLOWER MOTOR CONTROL CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect blower motor connector.

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

+

−

Voltage

(Approx.)

Blower motor

Connector

Terminal

M39

1

Ground

Battery voltage

+

−

Voltage

(Approx.)

Power transistor

Connector

Terminal

M344

1

Ground

Battery voltage

HAC-82

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

BLOWER MOTOR

Is the inspection result normal?

YES

>> Replace blower motor. Refer to 

VTL-14, "Removal and Installation"

.

NO

>> Repair harness or connector.

6.

CHECK A/C AUTO AMP. IGNITION POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp.

3. Turn ignition switch ON.

4. Check voltage between A/C auto amp. harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector between A/C auto amp. and fuse.

7.

CHECK POWER TRANSISTOR IGNITION POWER SUPPLY

Check voltage between power transistor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair harness or connector between power transistor and fuse.

8.

CHECK POWER TRANSISTOR GROUND CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Check continuity between power transistor harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair harness or connector.

9.

CHECK POWER TRANSISTOR CONTROL SIGNAL

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

2. Turn ignition switch ON.

3. Set air outlet to VENT. 

4. Change fan speed from 1st – 7th, and check duty ratios between blower motor harness connector and

ground by using an oscilloscope. 

NOTE:

Calculate the drive signal duty ratio as shown in the figure.

T2 = Approx. 1.6 ms

Power transistor

Blower motor

Continuity

Connector

Terminal

Connector

Terminal

M344

1

M39

2

Existed

+

−

Voltage

(Approx.)

A/C auto amp.

Connector

Terminal

M50

21

Ground

Battery voltage

+

−

Voltage

(Approx.)

Power transistor

Connector

Terminal

M344

4

Ground

Battery voltage

Power transistor

—

Continuity

Connector

Terminal

M344

3

Ground

Existed