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
INFOID:0000000006024181
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
E
F
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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
INFOID:0000000006024187
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.
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