Nissan Leaf. Manual — part 793
BLOWER MOTOR
HAC-175
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
BLOWER MOTOR
Component Function Check
INFOID:0000000010121879
1.
CHECK BLOWER MOTOR
With CONSULT
1. Turn power switch OFF.
2. Set the vehicle to READY.
3. Using CONSULT, perform “HVAC TEST” in “Active Test” of “HVAC”. Refer to
4. When the test items are being conducted, check that the blower motor operates normally for each mode.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Refer to
HAC-175, "Diagnosis Procedure"
Diagnosis Procedure
INFOID:0000000010121880
Regarding Wiring Diagram information, refer to
1.
CHECK FUSE
1. Turn power switch OFF.
2. Check 15A fuses [Nos. 14 and 16, located in fuse block (J/B)].
NOTE:
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the blown fuse after repairing the affected circuit.
2.
CHECK BLOWER MOTOR POWER SUPPLY
1. Disconnect blower motor connector.
2. Turn power switch ON.
3. Check voltage between blower motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK BLOWER RELAY
1. Turn power switch OFF.
2. Check blower relay. Refer to
HAC-178, "Component Inspection (Blower Relay)"
.
Is the inspection result normal?
YES
>> Repair harness or connector between blower motor and fuse.
NO
>> Replace blower relay.
4.
CHECK BLOWER MOTOR CONTROL CIRCUIT
1. Turn power switch OFF.
2. Connect blower motor connector.
3. Disconnect power transistor connector.
4. Turn power switch ON.
5. Check voltage between power transistor harness connector and ground.
+
−
Voltage
(Approx.)
Blower motor
Connector
Terminal
M39
1
Ground
Battery voltage
HAC-176
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
BLOWER MOTOR
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
CHECK BLOWER MOTOR CONTROL CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect blower motor connector.
3. Check continuity between power transistor harness connector and blower motor harness connector.
Is the inspection result normal?
YES
>> Replace blower motor. Refer to
VTL-22, "Removal and Installation"
.
NO
>> Repair harness or connector.
6.
CHECK POWER TRANSISTOR POWER SWITCH POWER SUPPLY
Check voltage between power transistor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector between power transistor and fuse.
7.
CHECK POWER TRANSISTOR GROUND CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Check continuity between power transistor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
8.
CHECK POWER TRANSISTOR CONTROL SIGNAL
1. Connect blower motor connector and A/C auto amp. connector.
2. Turn power switch ON.
3. Set air outlet to VENT.
4. Change fan speed from 1st – 7th, and check duty ratios between blower motor harness connector and
ground by using an oscilloscope.
NOTE:
Calculate the drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms
+
−
Voltage
(Approx.)
Power transistor
Connector
Terminal
M144
1
Ground
Battery voltage
Power transistor
Blower motor
Continuity
Connector
Terminal
Connector
Terminal
M144
1
M39
2
Yes
+
−
Voltage
(Approx.)
Power transistor
Connector
Terminal
M144
3
Ground
Battery voltage
Power transistor
—
Continuity
Connector
Terminal
M144
4
Ground
Yes
BLOWER MOTOR
HAC-177
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Is the inspection result normal?
YES
>> Replace power transistor. Refer to
HAC-199, "Removal and Installation"
.
NO
>> GO TO 9.
9.
CHECK POWER TRANSISTOR CONTROL SIGNAL CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect power transistor connector and A/C auto amp. connector.
3. Check continuity between power transistor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair harness or connector.
10.
CHECK POWER TRANSISTOR CONTROL SIGNAL CIRCUIT FOR SHORT
Check continuity between power transistor harness connector and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-187, "Removal and Installation"
.
NO
>> Repair harness or connector.
Component Inspection (Blower Motor)
INFOID:0000000010121881
1.
CHECK BLOWER MOTOR
1. Remove blower motor. Refer to
VTL-22, "Removal and Installation"
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 blower motor. Refer to
VTL-22, "Removal and Installation"
.
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 blower motor. Refer to
VTL-22, "Removal and Installation"
.
+
−
Condition
Duty ratio
(Approx.)
Output waveform
Power transistor
Connector
Terminal
Fan speed (manual)
Air outlet: VENT
M144
2
Ground
1st
26%
2nd
34%
3rd
41%
4th
51%
5th
62%
6th
73%
7th
82%
JPIIA1646GB
Power transistor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M144
2
M55
12
Yes
Power transistor
—
Continuity
Connector
Terminal
M144
2
Ground
No
HAC-178
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
BLOWER MOTOR
3.
CHECK BLOWER MOTOR
Check that blower motor turns smoothly.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace blower motor. Refer to
VTL-22, "Removal and Installation"
.
Component Inspection (Blower Relay)
INFOID:0000000010121882
1.
CHECK BLOWER RELAY
1. Remove blower relay. Refer to
2. Check continuity between blower relay terminal 3 and 5 when
the voltage is supplied between terminal 1 and 2.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace blower relay.
Terminal
Voltage
Continuity
3
5
ON
Yes
OFF
No
JSIIA1551ZZ
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