2009 INFINITI QX56 Factory Service Manual

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Page 2337 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-24
< FUNCTION DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
SELF-DIAGNOSIS FUNCTION
• Press the “BACK” switch and the “UP” switch within 10 seconds
after turning the ignition switch from OFF to

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INFINITI QX56 2009 Factory Service Manual MODE DOOR MOTORHAC-25
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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COMPONENT DIAGNOSIS
MODE DOOR MOTOR
System DescriptionINFOID:0000000003775343
SYSTEM DESCRIP

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INFINITI QX56 2009 Factory Service Manual HAC-26
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
The mode door motor (front) is attached to the heater & cooling unit
assembly. It rotates so that air is discharged from the o

HAC-26
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
The mode door motor (front) is attached to the heater & cooling unit
assembly. It rotates so that air is discharged from the outlet as indi-
cated by the A/C auto amp. Motor rotation is conveyed to a link
which activates the mode door.
Mode Door Motor (Front)
Component Function CheckINFOID:0000000003775344
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OP ERATIONAL CHECK - DISCHARGE AIR
1. Press mode switch four times and then press the (DEF) switch. Each position indicator should change shape (on display).
2. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-16, "
Discharge
Air Flow (Front)".
NOTE:
Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when DEF ( ) or D/F ( ) is selected.
Can a symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to HAC-4, "
Operational Check
(Front)".
Can a symptom be duplicated?
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 MODE DOOR OPERATION
Check and verify mode door mechanism for smooth operation in each mode.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair as necessary.
5.PERFORM A/C AUTO AMP. SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to HAC-23, "
A/C Auto Amp. Self-Diagnosis".
Are any self-diagnosis codes present?
YES >> Refer to HAC-24, "A/C System Self-Diagnosis Code Chart".
NO >> GO TO 6.
6.PERFORM A/C AND AV SWITCH ASSEMBLY SELF-DIAGNOSIS
Perform self-diagnosis to check the A/C and AV switch assembly. Refer to HAC-23, "
A/C and AV Switch
Assembly Self-Diagnosis".
Is the inspection result normal?
YES >> Replace A/C and AV switch assembly. Refer to VTL-7, "Removal and Installation".
NO >> GO TO 7.
WJIA0587E
Revision: December 20092009 QX56

Page 2340 of 4171

INFINITI QX56 2009 Factory Service Manual MODE DOOR MOTORHAC-27
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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7.CHECK THE MODE DOOR MOTOR (FRONT) PBR CIRCUIT
Perform diagnostic procedure for the mode d

MODE DOOR MOTORHAC-27
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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7.CHECK THE MODE DOOR MOTOR (FRONT) PBR CIRCUIT
Perform diagnostic procedure for the mode door motor (front). Refer to HAC-26, "
Mode Door Motor (Front)
Component Function Check".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair PBR circuit or replace motor. Refer to HAC-27, "
Mode Door Motor (Front) Diagnosis Pro-
cedure".
8.RECHECK FOR CODES
Perform A/C auto amp. self-diagnosis. Refer to HAC-23, "
A/C Auto Amp. Self-Diagnosis".
Are any self-diagnostic codes present?
YES >> Refer to HAC-24, "A/C System Self-Diagnosis Code Chart".
NO >> GO TO 9.
9.RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to HAC-4, "
Operational Check
(Front)".
Does another symptom exist?
YES >> Repair as necessary.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
Mode Door Motor (Front) Diagnosis ProcedureINFOID:0000000003775345
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Press the mode switch to the B/L ( ) mode.
3. Check voltage between A/C auto amp. harness connector M49 terminal 19 and terminal 20 while pressing the mode switch to
the floor ( ) mode.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 19, 20 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
ConnectorTe r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 20
19Press
mode
switch Battery
voltage
AWIIA0095ZZ
19 - Ground : Continuity should not exist.
20 - Ground : Continuity should not exist.
AWIIA0096ZZ
Revision: December 20092009 QX56

Page 2341 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-28
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
NO >> Repair or replace harness as necessary.
3.CHECK A/C AUTO AMP. FOR GROUND AND POWER
1. Press the mode switch to the D/F

Page 2342 of 4171

INFINITI QX56 2009 Factory Service Manual MODE DOOR MOTORHAC-29
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7.CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. D

Page 2343 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-30
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness

Page 2344 of 4171

INFINITI QX56 2009 Factory Service Manual AIR MIX DOOR MOTORHAC-31
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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AIR MIX DOOR MOTOR
System DescriptionINFOID:0000000003775346
SYSTEM DESCRIPTION
SYMPTOM:�

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