Nissan Cube. Manual — part 554
HAC-54
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
BLOWER MOTOR
BLOWER MOTOR
Description
INFOID:0000000009951000
BLOWER MOTOR
• The blower motor is installed in the RH side of A/C unit assembly.
• The blower motor adopts the forcible air cooling system and one-
touch installation system without any screws.
POWER TRANSISTOR
• The power transistor attached to A/C unit assembly.
• The power transistor controls the transmitting voltage to blower
motor base on the gate voltage from A/C auto amp.
• The power transistor is set for low voltage drop, therefore it dose
not require high relay while transmitting max voltage to blower
motor.
Component Function Check
INFOID:0000000009951001
1.
CHECK OPERATION
1.
Warm up the engine.
2.
Operate the fan control switch. Check that the fan speed and indicator unit are switched for all fan speeds.
Does it operate normally?
YES
>> INSPECTION END
NO
>> Perform the diagnosis for the blower motor. Refer to
Diagnosis Procedure
INFOID:0000000009951002
1.
CHECK FUSE
Check 15A fuses [Nos. 15 and 17, located in the fuse block (J/B)].
NOTE:
Refer to
PG-77, "Fuse, Connector and Terminal Arrangement"
.
Is inspection result normal?
JPIIA1575ZZ
JPIIA1634ZZ
JPIIA1660GB
BLOWER MOTOR
HAC-55
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
YES
>> GO TO 2.
NO
>> Replace the corresponding fuse.
2.
CHECK POWER SUPPLY OF BLOWER MOTOR
1.
Turn the ignition switch OFF.
2.
Disconnect the blower motor connector.
3.
Turn the ignition switch ON.
4.
Check voltage between blower motor harness connector and the ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK BLOWER MOTOR RELAY
1.
Turn the ignition switch OFF.
2.
Check the blower motor relay. Refer to
HAC-57, "Component Inspection"
Is inspection result normal?
YES
>> Repair the harness or connector between blower motor and fuse.
NO
>> Replace the blower motor relay.
4.
CHECK VOLTAGE BETWEEN POWER TRANSISTOR AND GROUND
1.
Connect the blower motor connector.
2.
Disconnect the power transistor connector.
3.
Turn the ignition switch ON.
4.
Check voltage between power transistor harness connector and the ground.
Is inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
CHECK CONTINUITY BETWEEN BLOWER MOTOR AND POWER TRANSISTOR
1.
Turn the ignition switch OFF.
2.
Disconnect the blower motor connector.
3.
Check continuity between blower motor harness connector and power transistor harness connector.
Is the inspection result normal?
YES
>> Replace the blower motor.
NO
>> Repair the harnesses or connectors.
6.
CHECK VOLTAGE BETWEEN POWER TRANSISTOR AND GROUND
Check voltage between power transistor harness connector and the ground.
(+)
(
−
)
Voltage
(Approx.)
Blower motor
—
Connector
Terminal
M39
1
Ground
Battery voltage
(+)
(
−
)
Voltage
(Approx.)
Blower motor
—
Connector
Terminal
M82
1
Ground
Battery voltage
Blower motor
Power transistor
Continuity
Connector
Terminal
Connector
Terminal
M39
2
M82
1
Existed
HAC-56
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
BLOWER MOTOR
Is inspection result normal?
YES
>> GO TO 7.
NO
>> Replace the harness or connector between power transistor and fuse.
7.
CHECK CONTINUITY BETWEEN POWER TRANSISTOR AND GROUND
Check continuity between power transistor harness connector and the ground.
Is inspection result normal?
YES
>> GO TO 8.
NO
>> Repair the harnesses or connectors.
8.
CHECK A/C AUTO AMP. OUTPUT SIGNAL
1.
Connect the blower motor connector and the A/C auto amp. connector.
2.
Turn the ignition switch ON.
3.
Set the mode position to VENT.
4.
Change fan speed from Lo to Hi, and check duty ratios between blower motor harness connector and the
ground by using an oscilloscope.
NOTE:
Calculate the drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
CHECK CONTINUITY BETWEEN POWER TRANSISTOR AND A/C AUTO AMP.
1.
Turn the ignition switch OFF.
2.
Disconnect the power transistor connector.
3.
Disconnect the A/C auto amp. connector.
4.
Check continuity between power transistor harness connector and A/C auto amp. harness connector.
(+)
(
−
)
Voltage
(Approx.)
Power transistor
—
Connector
Terminal
M82
4
Ground
Battery voltage
Blower motor
—
Continuity
Connector
Terminal
M82
3
Ground
Existed
(+)
(
−
)
Condition
Duty ratio
(Approx.)
Output waveform
Blower motor
—
Connector
Terminal
Fan speed (manual,
VENT mode)
M82
2
Ground
1st
26%
2nd
34%
3rd
41%
4th
51%
5th
62%
6th
73%
7th
82%
JPIIA1646GB
BLOWER MOTOR
HAC-57
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Is the inspection result normal?
YES
>> Replace the A/C auto amp.
NO
>> Repair the harnesses or connectors.
10.
CHECK CONTINUITY POWER TRANSISTOR SUB HARNESS
Check the sub harness continuity with the following figure.
Is the inspection result normal?
YES
>> Replace the power transistor.
NO
>> Repair the harnesses or connectors.
Component Inspection
INFOID:0000000009951003
BLOWER MOTOR
1.
CHECK BLOWER MOTOR
1.
Remove the blower motor. Refer to
2.
Check that there is not any mixing foreign object in the blower motor.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the blower motor.
2.
CHECK BLOWER MOTOR
Check that there is not breakage or damage in the blower motor.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace the blower motor.
3.
CHECK BLOWER MOTOR
Check that the blower motor turns smoothly.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace the blower motor.
BLOWER MOTOR RELAY
Power transistor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M82
2
M51
36
Existed
JPIIA1746GB
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