Infiniti G35 (V35). Manual — part 102
TROUBLE DIAGNOSIS
ATC-79
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Blower Speed Compensation
Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The low speed will vary depending on the sunload. During conditions of low or no sunload, the blower
low speed is at duty ratio 25%. During high sunload conditions, the display and A/C auto amp. raise the blower
speed (duty ratio 49%).
Fan Speed Control Specification
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.
DIAGNOSIS PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning.
RJIA1609E
ZHA152H
RJIA3509E
ATC-80
TROUBLE DIAGNOSIS
1.
CHECK POWER SUPPLY FOR BLOWER MOTOR
1.
Disconnect blower motor connector.
2.
Turn ignition switch ON.
3.
Check voltage between blower motor harness connector M62
terminal 1 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check power supply circuit and 15A fuses [Nos. 10 and
11, located in the fuse block (J/B)]. Refer to
"FUSE BLOCK - JUNCTION BOX (J/B)"
.
●
If fuses are OK, check harness for open circuit. Repair or replace if necessary.
●
If fuses are NG, check harness for short circuit and replace fuse.
2.
CHECK GROUND CIRCUIT FOR BLOWER MOTOR
1.
Turn ignition switch OFF.
2.
Check continuity between blower motor harness connector M62
terminal 3 and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
3.
CHECK CIRCUIT CONTINUITY BLOWER MOTOR AND DISPLAY AND A/C AUTO AMP.
1.
Disconnect display and A/C auto amp. connector.
2.
Check continuity between blower motor harness connector M62
terminal 2 and display and A/C auto amp. harness connector
M31 terminal 25.
OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector.
1 – Ground
: Battery voltage
RJIA1997E
3 – Ground
: Continuity should exist.
RJIA1998E
2 – 25
: Continuity should exist.
RJIA3510E
TROUBLE DIAGNOSIS
ATC-81
C
D
E
F
G
H
I
K
L
M
A
B
ATC
4.
CHECK DISPLAY AND A/C AUTO AMP. OUTPUT SIGNAL
1.
Reconnect blower motor connector and display and A/C auto
amp. connector.
2.
Turn ignition switch ON.
3.
Change the fan speed from Lo to Hi, and check the duty ratios
between blower motor harness connector M62 terminal 2 and
ground by using an oscilloscope. Normal terminal 2 drive signal
duty ratios are shown in the table below.
OK or NG
OK
>> Replace blower motor after confirming the fan air flow does not change.
NG
>> Replace display and A/C auto amp.
COMPONENT INSPECTION
Blower Motor
Confirm smooth rotation of the blower motor.
●
Ensure that there are no foreign particles inside the blower unit.
RJIA2000E
RJIA3511E
RJIA0905E
ATC-82
TROUBLE DIAGNOSIS
Magnet Clutch Circuit
NJS0003K
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1
ATC-52, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 1.
*2
ATC-100, "Ambient Sensor Circuit"
*3
ATC-52, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 14.
*4
ATC-83, "DIAGNOSIS PROCE-
DURE FOR MAGNET CLUTCH"
*5
ATC-93, "TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE"
*6
*7
ATC-52, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 5 to 7.
*8
*9
ATC-109, "Intake Sensor Circuit"
RJIA3512E
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