Nissan Tiida C11. Manual — part 864
HAC-120
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
BLOWER MOTOR CONTROL SYSTEM
YES
>> GO TO 7.
NO
>> Repair as necessary.
7.
CHECK INTAKE SENSOR CIRCUIT
Perform diagnostic procedure for the intake sensor circuit. Refer to
HAC-139, "Intake Sensor Diagnosis Pro-
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair as necessary.
8.
RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to
Does another symptom exist?
YES
>> Repair as necessary.
NO
>> Replace front air control. Refer to .
Front Blower Motor Diagnosis Procedure
INFOID:0000000001547419
SYMPTOM: Front blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Front blower motor operation is malfunctioning.
1.
CHECK POWER SUPPLY FOR FRONT BLOWER MOTOR
1.
Disconnect front blower motor connector M62.
2.
Turn ignition switch ON.
3.
Check voltage between front blower motor harness connector
M62 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>>
Check power supply circuit and 15A fuses [Nos. 15 and 17, located in the fuse block (J/B)].
• If fuses are OK, check harness for open circuit. Repair or replace if necessary.
• If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
2.
CHECK CIRCUIT POWER SUPPLY FOR VARIABLE BLOWER CONTROL
AWIIA0298GB
Terminals
Voltage
(Approx.)
(+)
(
−
)
Connector
Terminal
Ground
Front blower motor:
M62
1
Battery voltage
SJIA0794E
BLOWER MOTOR CONTROL SYSTEM
HAC-121
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1.
Turn ignition switch OFF.
2.
Connect front blower motor connector M62.
3.
Disconnect variable blower control connectors M90, M91.
4.
Turn ignition switch ON.
5.
Check voltage between variable blower control harness connec-
tor M91 (A) terminal 1, M90 (B) terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> • Terminal 1 - Ground: Repair harness or connector.
• Terminal 6 - Ground: GO TO 5.
3.
CHECK GROUND CIRCUIT FOR VARIABLE BLOWER CONTROL
1.
Turn ignition switch OFF.
2.
Check continuity between variable blower control harness con-
nector M91 terminal 2 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK FOR FRONT AIR CONTROL OUTPUT
1.
Reconnect variable blower control connector M91.
2.
Turn ignition switch ON.
Terminals
Voltage
(Approx.)
(+)
(
−
)
Connector
Terminal
A
Variable blower con-
trol: M91
1
Ground
Battery voltage
B
Variable blower con-
trol: M90
6
AWIIA0286ZZ
Connector
Terminal
Ground
Continuity
Variable blower control:
M91
2
Yes
AWIIA0299ZZ
AWIIA0300ZZ
HAC-122
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
BLOWER MOTOR CONTROL SYSTEM
3.
Change the blower motor speed from Lo to Hi, and confirm the duty ratios between variable blower control
harness connector M90 terminal 4 and ground using an oscilloscope. Usual terminal 4 drive signal duty
ratios are shown in the table below.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> • Blower motor speed is stuck at speed 4: GO TO 7.
• Blower motor speed is stuck at speed 1: GO TO 8.
5.
CHECK FRONT BLOWER MOTOR
1.
Turn ignition switch OFF.
2.
Disconnect front blower motor connector M62.
3.
Check continuity between front blower motor terminals.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace front blower motor. Refer to XX.
6.
CHECK CIRCUIT CONTINUITY BETWEEN FRONT BLOWER MOTOR AND VARIABLE BLOWER CON-
TROL
Check continuity between front blower motor harness connector
M62 (A) terminal 2 and variable blower control harness connector
M90 (B) terminal 6.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK CIRCUIT CONTINUITY BETWEEN FRONT AIR CONTROL AND VARIABLE BLOWER CONTROL
AWIIA0488ZZ
Terminal
Continuity
1
2
Yes
SJIA0798E
A
B
Continuity
Connector
Terminal
Connector
Terminal
Front blower mo-
tor: M62
2
Variable blower
control: M90
6
Yes
AWIIA0302ZZ
BLOWER MOTOR CONTROL SYSTEM
HAC-123
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector M50.
3.
Check continuity between front air control harness connector
M33 (A) terminal 15 and variable blower control harness con-
nector M64 (B) terminal 8.
Is the inspection result normal?
YES
>> Replace variable blower control Refer to XX.
NO
>> Repair harness or connector.
8.
CHECK FOR FRONT AIR CONTROL OUT PUT 2
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector M50.
3.
Turn ignition switch ON.
4.
Check output signal between front air control harness connector
M50 terminal 15 and ground.
Is the inspection result normal?
YES
>> Replace front air control. Refer to XX.
NO
>> Replace variable blower control. Refer to XX.
Front Blower Motor Component Inspection
INFOID:0000000001547420
COMPONENT INSPECTION
Blower Motor
Confirm smooth rotation of the blower motor (1).
• Ensure that there are no foreign particles inside the A/C unit
assembly.
A
B
Continuity
Connector
Terminal
Connector
Terminal
Front air control:
M50
15
Variable blower
control: M90
4
Yes
AWIIA0303ZZ
Terminals
Condition
Voltage
(Approx.)
(+)
(
−
)
Connector
Terminal
Ground
Front air
control:
M50
15
Blower mo-
tor speed:
1st
SJIA0801E
ZJIA0863J
SJIA0735E
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