Nissan Sentra. Manual — part 560
HAC-88
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER FAN ON SIGNAL
BLOWER FAN ON SIGNAL
Component Function Check
INFOID:0000000009757685
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:0000000009757686
Regarding Wiring Diagram information, refer to
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-105, "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?
Monitor item
Condition
Status
FAN ON SIG
Blower motor
ON
On
OFF
OFF
+
−
Output waveform
A/C auto amp.
Connector
Terminal
M34
14
Ground
PKIB4960J
A/C auto amp.
BCM
Continuity
Connector
Terminal
Connector
Terminal
M34
14
M84
28
Yes
BLOWER FAN ON SIGNAL
HAC-89
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR SHORT
Check continuity between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES
>> Replace BCM. Refer to
BCS-73, "Removal and Installation"
NO
>> Repair harness or connector.
A/C auto amp.
—
Continuity
Connector
Terminal
M34
14
Ground
No
HAC-90
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
BLOWER MOTOR
Diagnosis Procedure
INFOID:0000000009757687
Regarding Wiring Diagram information, refer to
1.
CHECK FUSE
1. Turn ignition switch OFF.
2. Check following fuses.
-
10A fuse [No. 21, located in fuse block (J/B)]
-
15A fuses [Nos. 20 and 22, 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 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-93, "Component Inspection (Blower Motor 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 variable blower control connector.
4. Turn ignition switch ON.
5. Check voltage between variable blower control 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
+
−
Voltage
Blower motor
Connector
Terminal
M62
1
Ground
Battery voltage
+
−
Voltage
Variable blower control
Connector
Terminal
M52
1
Ground
Battery voltage
BLOWER MOTOR
HAC-91
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Disconnect blower motor connector.
3. Check continuity between variable blower control harness connector and blower motor harness connec-
tor.
Is the inspection result normal?
YES
>> Replace blower motor. Refer to
VTL-10, "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 VARIABLE BLOWER CONTROL IGNITION POWER SUPPLY
Check voltage between variable blower control harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector between variable blower control and fuse.
8.
CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Check continuity between variable blower control harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair harness or connector.
9.
CHECK VARIABLE BLOWER CONTROL CONTROL SIGNAL
1. Connect variable blower control connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Set air outlet to VENT.
Variable blower control
Blower motor
Continuity
Connector
Terminal
Connector
Terminal
M52
1
M62
2
Existed
+
−
Voltage
A/C auto amp.
Connector
Terminal
M34
21
Ground
Battery voltage
+
−
Voltage
Variable blower control
Connector
Terminal
M52
4
Ground
Battery voltage
Variable blower control
—
Continuity
Connector
Terminal
M52
3
Ground
Yes
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