Infiniti G35 (V35) Sedan. Manual — part 778
HAC-84
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
3.
CHECK ENGINE COOLANT TEMPERATURE
Check engine coolant temperature.
Is engine coolant temperature below 56
°
C (133
°
F)?
YES
>> GO TO 4.
NO
>> Blower motor operation is normal.
4.
CHECK BLOWER MOTOR OPERATING
Check blower motor operating.
Is blower motor operation under starting blower speed control?
YES
>> END.
NO
>> GO TO 5.
5.
CHECK POWER SUPPLY FOR BLOWER MOTOR
1.
Disconnect blower motor connector.
2.
Turn ignition switch ON.
3.
Check voltage between blower motor harness connector M109 terminal 1 and ground.
Is the inspection result normal?
OK
>> GO TO 6.
NG
>> GO TO 9.
6.
CHECK BLOWER MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between blower motor harness connector M109 terminal 3 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
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 M109 terminal 2 and unified meter and A/C
amp. harness connector M66 terminal 38.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
8.
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.
(+)
(
−
)
Voltage
Blower motor
—
Connector
Terminal
M109
1
Ground
Battery voltage
(+)
(
−
)
Continuity
blower motor
—
Connector
Terminal
M109
3
Ground
Continuity should exist
(+)
(
−
)
Continuity
blower motor
Unified meter and A/C amp.
Connector
Terminal
Connector
Terminal
M109
2
M66
38
Continuity should exist
BLOWER MOTOR
HAC-85
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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
>> Replace blower motor after confirming the fan air flow does not change.
NO
>> Replace unified meter and A/C amp.
9.
CHECK POWER VOLTAGE OF BLOWER FAN MOTOR
1.
Turn ignition switch OFF.
2.
Remove blower fan motor relay. Refer to
PG-93, "Fuse, Connector and Terminal Arrangement"
3.
Turn ignition switch ON.
4.
Check the voltage between blower fan motor relay fuse block terminals 1, 3 and body ground. Refer to
for relay terminal assignment.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 10.
10.
CHECK IGNITION SWITCH
Check ignition switch.
Is the inspection result normal?
YES
>> Repair harness or connector.
NG
>> Replace ignition switch.
11.
CHECK BLOWER FAN MOTOR RELAY
1.
Turn ignition switch OFF.
2.
Install blower fan motor relay. Refer to
PG-93, "Fuse, Connector and Terminal Arrangement"
3.
Check operation sound of the blower fan motor relay after switching ignition switch ON.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Replace blower fan motor relay.
12.
CHECK FUSE
JSIIA0068GB
(+)
(
−
)
Voltage
Blower fan motor relay
—
Fuse block terminal
1
Ground
Battery voltage
3
HAC-86
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
Check fuse 15A [Nos 21 and 22, located in the fuse block (J/B). Refer to
PG-93, "Fuse, Connector and Termi-
Is the inspection result normal?
YES
>> Repair harness or connector.
NG
>> Replace fuse.
WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : Component Inspection
INFOID:0000000000959943
Confirm smooth rotation of the blower motor (1).
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL
SYSTEM : Description
INFOID:0000000000959944
COMPONENT DESCRIPTION
Brush-less Motor
The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness is improved over previous motors where the brush was
the point of contact and the coil rotated.
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Function Check
INFOID:0000000000959945
1.
CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK
1.
Press fan (UP: +) switch. Blower should operate on low speed.
2.
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-86, "WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM : Diagnosis Procedure"
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL
SYSTEM : Diagnosis Procedure
INFOID:0000000000959946
1.
PERFORM SELF-DIAGNOSIS STEP-2
JSIIA0044ZZ
ZHA152H
BLOWER MOTOR
HAC-87
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Perform self-diagnosis STEP-2. Refer to
HAC-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
, see No. 1 to 2.
Is there any malfunction displayed?
YES
>> Go to appropriate malfunctioning sensor circuit. Refer to
HAC-50, "WITH LEFT AND RIGHT VEN-
TILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
, see to
No. 11.
NO
>> GO TO 2.
2.
PERFORM SELF-DIAGNOSIS STEP-4
Perform self-diagnosis STEP-4. Refer to
HAC-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
, see No. 1 to 5.
Does blower motor speed change according to each code No.?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
CHECK ENGINE COOLANT TEMPERATURE
Check engine coolant temperature.
Is engine coolant temperature below 56
°
C (133
°
F)?
YES
>> GO TO 4.
NO
>> Blower motor operation is normal.
4.
CHECK BLOWER MOTOR OPERATING
Check blower motor operating.
Is blower motor operation under starting blower speed control?
YES
>> END.
NO
>> GO TO 5.
5.
CHECK POWER SUPPLY FOR BLOWER MOTOR
1.
Disconnect blower motor connector.
2.
Turn ignition switch ON.
3.
Check voltage between blower motor harness connector M109 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 9.
6.
CHECK BLOWER MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between blower motor harness connector M109 terminal 3 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
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
(+)
(
−
)
Continuity
blower motor
—
Connector
Terminal
M109
3
Ground
Continuity should exist
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