Infiniti G37 Coupe. Manual — part 773
BLOWER MOTOR
HAC-81
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Blower motor circuit
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Function Check
INFOID:0000000001675710
1.
CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK
1.
Start engine and warm it up to normal operating temperature.
2.
Press fan (UP: +) switch. Blower should operate on low speed.
3.
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-81, "WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM : Diagnosis Procedure"
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL
SYSTEM : Diagnosis Procedure
INFOID:0000000001675711
1.
PERFORM SELF-DIAGNOSIS STEP-4
Perform self-diagnosis STEP-4. Refer to
HAC-48, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
, see Nos. 1 to 5.
Does blower motor speed change according to each code No.?
YES
>> END.
NO
>> GO TO 2.
2.
CHECK POWER SUPPLY FOR BLOWER MOTOR
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 3.
NO
>> GO TO 6.
3.
CHECK BLOWER MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between blower motor harness connector and ground.
JSIIA0779GB
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
HAC-82
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
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 and unified meter and A/C amp. harness con-
nector.
3.
Check continuity between blower motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair harness or connector.
5.
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.
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
>> Check blower motor. Refer to
HAC-83, "WITH LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Component Inspection"
NO
>> Replace unified meter and A/C amp.
blower motor
—
Continuity
Connector
Terminal
M109
3
Ground
Existed
blower motor
Unified meter and A/C amp.
Continuity
Connector
Terminal
Connector
Terminal
M109
2
M66
38
Existed
blower motor
—
Continuity
Connector
Terminal
M109
2
ground
Not existed
JSIIA0068GB
BLOWER MOTOR
HAC-83
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
6.
CHECK POWER VOLTAGE OF BLOWER FAN MOTOR
Check the voltage between fuse block connector and ground. Refer to
PG-91, "Fuse, Connector and Terminal
.
Is the inspection result normal?
YES
>> Repair harness or connector [between fuse block (J/B) and blower fan motor].
NO
>> GO TO 7.
7.
CHECK POWER VOLTAGE OF BLOWER RELAY
Check the voltage between fuse block (J/B) connector and ground. Refer to
PG-91, "Fuse, Connector and Ter-
.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 9.
8.
CHECK FUSE
Check fuse 15A [Nos 21 and 22, located in the fuse block (J/B). Refer to
PG-91, "Fuse, Connector and Termi-
Is the inspection result normal?
YES
>> Replace blower relay.
NO
>> Be sure to eliminate cause of malfunction before installing new fuse.
9.
CHECK POWER VOLTAGE OF BLOWER RELAY (BCM)
Check the voltage between fuse block (J/B) connector and ground.
Is the inspection result normal?
YES
>> Repair harness or connector (between BCM and fuse block).
NO
>> Check ignition power supply. Refer to
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Inspection
INFOID:0000000001713995
1.
CHECK BLOWER MOTOR
(+)
(
−
)
Voltage
Fuse block (J/B)
—
Connector
Terminal
M1
3A
Ground
Battery voltage
8A
(+)
(
−
)
Voltage
Fuse block (J/B)
—
Connector
Terminal
E103
6F
Ground
Battery voltage
(+)
(
−
)
Voltage
BCM
—
Connector
Terminal
M122
102
Ground
Battery voltage
HAC-84
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
1.
Remove blower motor (1).
2.
Confirm smooth rotation of the blower motor.
Is the inspection result normal?
YES
>> END.
NO
>> Replace blower motor.
JSIIA0044ZZ
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