Infiniti EX35. Manual — part 920
HAC-76
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
Check installation of air mix door motor (driver side). Refer to
.
Is it installed normally?
YES
>> GO TO 4.
NO
>> Repair or replace air mix door motor (driver side).
4.
CHECK POWER SUPPLY FOR AIR MIX DOOR MOTOR (DRIVER SIDE)
Check voltage between air mix door motor (driver side) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair harness or connector.
5.
CHECK SIGNAL FOR AIR MIX DOOR MOTOR (DRIVER SIDE)
Confirm A/C LAN signal between air mix door motor (driver side) harness connector and ground using an
oscilloscope.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect air mix door motor (driver side) connector.
3.
Check continuity between air mix door motor (driver side) harness connector and ground.
Is the inspection result normal?
YES
>> Replace air mix door motor (driver side).
NO
>> Repair harness or connector.
7.
CHECK INSTALLATION OF AIR MIX DOOR MOTOR (PASSENGER SIDE)
Check installation of air mix door motor (passenger side). Refer to
.
Is it installed normally?
YES
>> GO TO 8.
NO
>> Repair or replace air mix door motor (passenger side).
8.
CHECK POWER SUPPLY FOR AIR MIX DOOR MOTOR (PASSENGER SIDE)
(+)
(
−
)
Voltage
Air mix door motor (driver side)
—
Connector
Terminal
M252
1
Ground
Battery voltage
(+)
(
−
)
Voltage
Air mix door motor (driver side)
—
Connector
Terminal
M252
3
Ground
SJIA1453J
Air mix door motor (driver side)
—
Continuity
Connector
Terminal
M252
2
Ground
Existed
AIR MIX DOOR MOTOR
HAC-77
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Check voltage between air mix door motor (passenger side) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair harness or connector.
9.
CHECK SIGNAL FOR AIR MIX DOOR MOTOR (PASSENGER SIDE)
Confirm A/C LAN signal between air mix door motor (passenger side) harness connector and ground using an
oscilloscope.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair harness or connector.
10.
CHECK AIR MIX DOOR MOTOR (PASSENGER SIDE) GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect air mix door motor (passenger side) connector.
3.
Check continuity between air mix door motor (passenger side) harness connector and ground.
Is the inspection result normal?
YES
>> Replace air mix door motor (passenger side).
NO
>> Repair harness or connector.
(+)
(
−
)
Voltage
Air mix door motor (passenger side)
—
Connector
Terminal
M255
1
Ground
Battery voltage
(+)
(
−
)
Voltage
Air mix door motor (passenger side)
—
Connector
Terminal
M255
3
Ground
SJIA1453J
Air mix door motor (passenger side)
—
Continuity
Connector
Terminal
M255
2
Ground
Existed
HAC-78
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
INTAKE DOOR MOTOR
Description
INFOID:0000000003545612
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor (1) is attached to the blower unit. It rotates so
that air is drawn from inlets set by the unified meter and A/C amp.
Motor rotation is conveyed to a lever which activates the intake door.
Component Function Check
INFOID:0000000003545613
1.
CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK
1.
Press intake switch.
2.
REC indicator turns ON.
3.
Listen for intake door position change (Slight change of blower sound can be heard.).
4.
Press intake switch again.
5.
FRE indicator turns ON.
Is the inspection result normal?
YES
>> END.
NO
>> Go to diagnosis procedure. Refer to
Diagnosis Procedure
INFOID:0000000003545614
1.
PERFORM SELF-DIAGNOSIS STEP-2
Perform self-diagnosis STEP-2. Refer to
HAC-57, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-63, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature sepa-
rately control system), see Nos. 1 to 2.
Does code No. 20 appear on the display?
YES
>> GO TO 2.
NO
>> Go to appropriate malfunctioning sensor circuit. Refer to
HAC-57, "WITHOUT LEFT AND RIGHT
VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation temperature separately control system) or
AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis
Description"
(With left and right ventilation temperature separately control system), see No. 11.
2.
PERFORM SELF-DIAGNOSIS STEP-4
Perform self-diagnosis STEP-4. Refer to
HAC-57, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-63, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature sepa-
rately control system), see Nos. 1 to 5.
Is it operated normally?
YES
>> END.
NO
>> GO TO 3.
3.
CHECK INTAKE DOOR CONTROL LINKAGE
:
Vehicle front
JSIIA0007GB
INTAKE DOOR MOTOR
HAC-79
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Check intake door control linkage.
Is it installed normally?
YES
>> GO TO 4.
NO
>> Repair or adjust control linkage.
4.
CHECK POWER SUPPLY FOR INTAKE DOOR MOTOR
Check voltage between intake door motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair harness or connector.
5.
CHECK SIGNAL FOR INTAKE DOOR MOTOR
Confirm A/C LAN signal between intake door motor harness connector and ground using an oscilloscope.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK INTAKE DOOR MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect intake door motor connector.
3.
Check continuity between intake door motor harness connector and ground.
Is the inspection result normal?
YES
>> Replace intake door motor.
NO
>> Repair harness or connector.
(+)
(
−
)
Voltage
Intake door motor
—
Connector
Terminal
M254
1
Ground
Battery voltage
(+)
(
−
)
Voltage
Intake door motor
—
Connector
Terminal
M254
3
Ground
SJIA1453J
Intake door motor
—
Continuity
Connector
Terminal
M254
2
Ground
Existed
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