2009 INFINITI QX56 Factory Service Manual

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Page 2353 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-40
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect the air mix door motor (passenger) harness connec-
tor and A/C auto amp. harness

Page 2354 of 4171

INFINITI QX56 2009 Factory Service Manual INTAKE DOOR MOTORHAC-41
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
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F
G H
J
K L
M A
B
HAC
N
O P
INTAKE DOOR MOTOR
System DescriptionINFOID:0000000003775350
SYSTEM DESCRIPTION
SYMTOM:•

Page 2355 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-42
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
COMPONENT DESCRIPTION
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is draw

Page 2356 of 4171

INFINITI QX56 2009 Factory Service Manual INTAKE DOOR MOTORHAC-43
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
Intake Door Motor Diagnosis ProcedureINFOID:0000000003775352
SYMPTOM:
• Intake door does

Page 2357 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-44
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. ha

Page 2358 of 4171

INFINITI QX56 2009 Factory Service Manual DEFROSTER DOOR MOTOR CIRCUITHAC-45
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
DEFROSTER DOOR MOTOR CIRCUIT
System DescriptionINFOID:0000000003775353
SYSTEM D

Page 2359 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-46
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
DEFROSTER DOOR MOTOR CIRCUIT
Defroster Door Motor Component Function Check
INFOID:0000000003775354
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFOR

HAC-46
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
DEFROSTER DOOR MOTOR CIRCUIT
Defroster Door Motor Component Function Check
INFOID:0000000003775354
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OP ERATIONAL CHECK - DEFROSTER DOOR
1. Press the mode switch and select vent ( ).
2. Press the defrost switch ( ). Defroster indicator should illuminate (on display).
3. Listen for defroster door position c hange (blower sound should change slightly).
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to HAC-4, "
Operational Check (Front)".
Does another symptom exist?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> SYSTEM OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK DEFROSTER DOOR MOTOR
Perform diagnostic procedure for defroster door motor. Refer to HAC-46, "
Defroster Door Motor Component
Function Check".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair PBR circuit or replace defroster door motor. Refer to VTL-21, "
Removal and Installation".
5.CHECK DEFROSTER DOOR OPERATION
Check and verify defroster door mechanism for smooth operation.
Is the inspection result normal?
YES >> Replace defroster door motor. Refer to VTL-21, "Removal and Installation".
NO >> Repair defroster door mechanism.
Defroster Door Motor Diagnosis ProcedureINFOID:0000000003775355
SYMPTOM:
• Defroster door does not change.
• Defroster door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR DEFROSTER DOOR MOTOR
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Press the defroster switch ( ).
3. Check voltage between A/C auto amp. harness connector M49 terminal 24 and terminal 23 and pr ess the defroster switch ( )
again.
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 24 23 Press de-
froster switch Battery
voltage
AWIIA0152ZZ
Revision: December 20092009 QX56

Page 2360 of 4171

INFINITI QX56 2009 Factory Service Manual DEFROSTER DOOR MOTOR CIRCUITHAC-47
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK DEFROST

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