Nissan March K13. Manual - part 402

HAC-142

< DTC/CIRCUIT DIAGNOSIS >

[HEATER AND VENTILATION]

BLOWER FAN ON SIGNAL

BLOWER FAN ON SIGNAL

Component Function Check

INFOID:0000000006024180

1.

CHECK BLOWER FAN ON SIGNAL

With CONSULT-III

1.

Turn the ignition switch ON.

2.

Select the “FAN ON SIG” on “DATA MONITOR” in BCM.

3.

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

Is inspection result normal?

YES

>> INSPECTION END

NO

>> Refer to 

HAC-142, "Diagnosis Procedure"

.

Diagnosis Procedure

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1.

CHECK BLOWER FAN ON SIGNAL OUTPUT

1.

Turn the ignition switch OFF.

2.

Disconnect the heater control connector.

3.

Turn the ignition switch ON.

4.

Check output waveform between heater control harness connector and the ground with using oscillo-
scope.

Is inspection result normal?

YES

>> Replace the heater control.

NO

>> GO TO 2.

2.

CHECK CONTINUITY BETWEEN HEATER CONTROL AND BCM

1.

Turn the ignition switch OFF.

2.

Disconnect the BCM connector.

3.

Check continuity between heater control harness connector and BCM harness connector.

Is inspection result normal?

YES

>> GO TO 3.

NO

>> Repair the harness or connector.

Monitor item

Condition

Status

FAN ON SIG

Fan control dial

OFF position

Off

Except OFF position

On

(+)

(

−

)

Output waveform

Heater control

—

Connector

Terminal

M28

5

Ground

Approx. 1.5

∼

2.0 V

PIIB7730J

Heater control

BCM

Continuity

Connector

Terminal

Connector

Terminal

M28

5

M65

28

Existed

BLOWER FAN ON SIGNAL

HAC-143

< DTC/CIRCUIT DIAGNOSIS >

[HEATER AND VENTILATION]

C

D

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J

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HAC

N

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3.

CHECK CONTINUITY BETWEEN HEATER CONTROL AND GROUND

Check continuity between heater control harness connector and the ground.

Is inspection result normal?

YES

>> Replace the BCM. Refer to 

XX-XX, "*****"

.

NO

>> Repair the harness or connector.

Heater control

—

Continuity

Connector

Terminal

M28

Ground

Not existed

HAC-144

< SYMPTOM DIAGNOSIS >

[HEATER AND VENTILATION]

HEATER AND VENTILATION CONTROL SYSTEM

SYMPTOM DIAGNOSIS

HEATER AND VENTILATION CONTROL SYSTEM

Diagnosis Chart By Symptom

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CAUTION:

Perform the self-diagnosis with CONSULT-III before performing the symptom diagnosis. If any mal-
function result or DTC is detected, perform the corresponding diagnosis.

*: Manual heater models

Symptom

Corresponding malfunction part

Check item/Reference

Blower motor operation is malfunctioning.

• Blower  motor
• Power supply system of blower mo-

tor

• The circuit between blower motor 

and fan switch.

• The circuit between blower motor 

and blower fan resistor.

• Blower fan resistor.
• Fan switch (Heater control).

HAC-139, "Diagnosis Proce-
dure"

 

• Insufficient heating

*

• No warm air comes out. (Air flow volume is normal.)

*

• Engine cooling system
• Heater hose
• Heater core
• Air leakage from each duct

HAC-145, "Diagnosis Proce-
dure"

Noise is heard when the heater system operates.

• Mixing any foreign object in blower 

motor

• Blower motor fan breakage
• Blower motor rotation inferiority

HAC-140, "Component Inspec-
tion"

Air inlet dose not change.

• Heater control
• Intake door cable
• Intake door

Check the intake door installa-
tion and door operation

Discharge air temperature dose not change.

*

• Heater control
• Air mix door cable
• Air mix door

Check the air mix door installa-
tion and door operation

Air outlet dose not change.

• Heater control
• Mode door cable
• Mode door

Check the mode door installa-
tion and door operation

INSUFFICIENT HEATING

HAC-145

< SYMPTOM DIAGNOSIS >

[HEATER AND VENTILATION]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

INSUFFICIENT HEATING

Description

INFOID:0000000006024188

Symptom

• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)

Diagnosis Procedure

INFOID:0000000006024189

CAUTION:

Perform the self-diagnosis with CONSULT-III before performing symptom diagnosis. If any malfunc-
tion result or DTC is detected, perform the corresponding diagnosis.

1.

CHECK COOLING SYSTEM

1.

Check the engine coolant level and check for leakage. Refer to 

XX-XX, "*****"

.

2.

Check the radiator cap. Refer to 

XX-XX, "*****"

.

3.

Check the water flow sounds of the engine coolant. Refer to 

XX-XX, "*****"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refill the engine coolant and repair or replace the parts depending on the inspection results.

2.

CHECK HEATER HOSE

Check the installation of heater hose by visually or touching.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace parts depending on the inspection results.

3.

CHECK HEATER CORE

1.

Check the temperature of inlet hose and outlet hose of heater core.

2.

Check that the inlet side of heater core is hot and the outlet side is slightly lower than/almost equal to the
inlet side.

CAUTION:

Always perform the temperature inspection in a short period of time because the engine coolant
temperature is very hot.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace the heater core. Refer to 

XX-XX, "*****"

.

4.

CHECK AIR LEAKAGE FROM EACH DUCT

Check duct and nozzle, etc. of the air conditioner system for air leakage.

Is the inspection result normal?

YES

>> Check the air mix door cable installation and air mix door operation.

NO

>> Repair or replace parts depending on the inspection results.