Nissan Juke F15. Instruction — part 861
BLOWER FAN ON SIGNAL
HAC-79
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
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HAC
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BLOWER FAN ON SIGNAL
Component Function Check
INFOID:0000000012200067
1.
CHECK BLOWER FAN ON SIGNAL
With CONSULT
1. Turn ignition switch ON.
2. Select “AIR CONDITIONER” of “BCM” using CONSULT.
3. Select “FAN ON SIG” in “DATA MONITOR” mode.
4. Check blower fan ON signal when the fan control dial is operated.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Refer to
Diagnosis Procedure
INFOID:0000000012200068
1.
CHECK BLOWER FAN ON SIGNAL
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. harness connector.
3. Turn ignition switch ON.
4. Check output waveform between A/C auto amp. and ground with using oscilloscope.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-93, "Removal and Installation"
NO
>> GO TO 2.
2.
CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity A/C auto amp. harness connector and BCM harness connector.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR SHORT
Monitor item
Condition
Status
FAN ON SIG
Blower motor
ON
On
OFF
OFF
+
−
Output waveform
A/C auto amp.
Connector
Terminal
M50
14
Ground
PKIB4960J
A/C auto amp.
BCM
Continuity
Connector
Terminal
Connector
Terminal
M50
14
M68
28
Existed
HAC-80
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
BLOWER FAN ON SIGNAL
Check continuity between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES
>> Replace BCM. Refer to
BCS-94, "Removal and Installation"
NO
>> Repair harness or connector.
A/C auto amp.
—
Continuity
Connector
Terminal
M50
14
Ground
Not existed
BLOWER MOTOR
HAC-81
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
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G
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A
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HAC
N
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BLOWER MOTOR
Diagnosis Procedure
INFOID:0000000012200069
1.
CHECK FUSE
1. Turn ignition switch OFF.
2. Check following fuses.
-
10A fuse [No. 15, located in fuse block (J/B)]
-
15A fuses [Nos. 14 and 16, located in fuse block (J/B)]
NOTE:
PG-80, "Fuse, Connector and Terminal Arrangement"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.
CHECK BLOWER MOTOR POWER SUPPLY
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 4.
NO
>> GO TO 3.
3.
CHECK BLOWER RELAY
1. Turn ignition switch OFF.
2. Check blower relay. Refer to
HAC-84, "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 ignition switch OFF.
2. Connect blower motor connector.
3. Disconnect power transistor connector.
4. Turn ignition switch ON.
5. Check voltage between power transistor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
CHECK BLOWER MOTOR CONTROL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect blower motor connector.
3. Check continuity between power transistor harness connector and blower motor harness connector.
+
−
Voltage
(Approx.)
Blower motor
Connector
Terminal
M39
1
Ground
Battery voltage
+
−
Voltage
(Approx.)
Power transistor
Connector
Terminal
M344
1
Ground
Battery voltage
HAC-82
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
BLOWER MOTOR
Is the inspection result normal?
YES
>> Replace blower motor. Refer to
VTL-14, "Removal and Installation"
.
NO
>> Repair harness or connector.
6.
CHECK A/C AUTO AMP. IGNITION POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp.
3. Turn ignition switch ON.
4. Check voltage between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector between A/C auto amp. and fuse.
7.
CHECK POWER TRANSISTOR IGNITION POWER SUPPLY
Check voltage between power transistor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector between power transistor and fuse.
8.
CHECK POWER TRANSISTOR GROUND CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Check continuity between power transistor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair harness or connector.
9.
CHECK POWER TRANSISTOR CONTROL SIGNAL
1. Connect blower motor connector and A/C auto amp. connector.
2. Turn ignition 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
Power transistor
Blower motor
Continuity
Connector
Terminal
Connector
Terminal
M344
1
M39
2
Existed
+
−
Voltage
(Approx.)
A/C auto amp.
Connector
Terminal
M50
21
Ground
Battery voltage
+
−
Voltage
(Approx.)
Power transistor
Connector
Terminal
M344
4
Ground
Battery voltage
Power transistor
—
Continuity
Connector
Terminal
M344
3
Ground
Existed
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