INFINITI QX56 2011 Factory Service Manual

OPERATION INSPECTIONHAC-65
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONING]
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2. Check that discharge air temperature changes.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 8.
5.CHECK WITH TEMPERAT URE SETTING LOWERED
1. Operate temperature control dial (drive r side) and lower the set temperature to 18°C (60 °F).
2. Check that cool air blows from the air outlets.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 8.
6.CHECK TEMPERATURE INCREASE
1. Operate temperature control dial (drive r side) and raise the set temperature to 32°C (90 °F).
2. Check that warm air blows from the air outlets.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 8.
7.CHECK AUTO MODE
1. Press AUTO switch.
2. Operate temperature control dial (driver side) to check that fan speed or air outlet changes (the air outlet
or fan speed varies depending on the ambient temperatur e, in-vehicle temperature (rear side), set tem-
perature, and etc.).
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 8.
8.CHECK SELF-DIAGNOSIS WITH CONSULT-III
1. Perform self-diagnosis with CONSULT-III.
2. Check that any DTC is detected.
Is any DTC detected?
YES >> Refer to HAC-45, "DTC Index" and perform the appropriate diagnosis.
NO >> Refer to HAC-135, "
Diagnosis Chart By Symptom" and perform the appropriate diagnosis.
Rear A/C Control Operation
1.CHECK REAR BLOWER MOTOR
1. Press AUTO switch.
2. Operate fan switch.
3. Check that fan speed changes. C heck operation for all fan speeds.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 7.
2.CHECK DISCHARGE AIR
1. Operate fan switch to set the fan speed to maximum speed.
2. Operate MODE switch.
3. Check that air outlets change according to each indica ted air outlet by placing a hand in front of the out-
lets. Refer to VTL-7, "
VENTILATION SYSTEM (REAR AIR CONDI TIONING) : System Description".
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 7.
3.CHECK DISCHARGE AIR TEMPERATURE
1. Operate temperature control switch.
2. Check that discharge air temperature changes.
Is the inspection result normal?
Revision: 2010 May2011 QX56

HAC-66
< BASIC INSPECTION >[AUTOMATIC AIR CONDITIONING]
OPERATION INSPECTION
YES >> GO TO 4.
NO >> GO TO 7.
4.CHECK WITH TEMPERATURE SETTING LOWERED
1. Operate temperature control switch and lower the set temperature to 18°C.
2. Check that cool air blows from the air outlets.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 7.
5.CHECK TEMPERATURE INCREASE
1. Operate temperature control switch and raise the set temperature to 32°C.
2. Check that warm air bl ows from the air outlets.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 7.
6.CHECK AUTO MODE
1. Press AUTO switch.
2. Operate temperature control switch to check that fan speed or air outlet changes (the air outlet or fan
speed varies depending on the ambient temperature, in-v ehicle temperature (rear side), set temperature,
and etc.).
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 7.
7.CHECK SELF-DIAGNOSIS WITH CONSULT-III
1. Perform self-diagnosis with CONSULT-III.
2. Check that any DTC is detected.
Is any DTC detected?
YES >> Refer to HAC-45, "DTC Index" and perform the appropriate diagnosis.
NO >> Refer to HAC-135, "
Diagnosis Chart By Symptom" and perform the appropriate diagnosis.
ACCS (ADVANCED CLIM ATE CONTROL SYSTEM)
ACCS (ADVANCED CLIMATE CONT ROL SYSTEM) : Work ProcedureINFOID:0000000006275894
DESCRIPTION
The purpose of the operational check is to che ck that the individual system operates normally.
NOTE:
Check that front automatic air conditi oning system operates normally. Refer to HAC-62, "
FRONT AUTOMATIC
AIR CONDITIONING SYSTEM : Work Procedure".
OPERATION INSPECTION
1.CHECK PLASMACLUSTER™ CONTROL
Check the ionizer operation sound (whirring sound) in the duc t by putting an ear to the center ventilator grille
(driver side) outlet while pressing fan switch and OFF switch alternately.
NOTE:
 Plasmacluster
™ ion technology developed by Sharp Corporation is installed in this item.
 Plasmacluster
™ is a trademark of Sharp Corporation.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK PLASMACLUSTER™ CONTROL OPERATION STATUS
Check condition : Engine running
Revision: 2010 May2011 QX56

OPERATION INSPECTIONHAC-67
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONING]
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Operate fan switch. Visually check that status indica tor in front display changes in accordance with the follow-
ing table.
NOTE:
 Plasmacluster
™ ion technology developed by Sharp Corporation is installed in this item.
 Plasmacluster
™ is a trademark of Sharp Corporation.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 4.
3.CHECK AUTOMATIC INTAKE CONTROL (EXHAUST GAS / OUTSIDE ODOR DETECTING MECHANISM)
1. Operate fan switch to set the fan speed to maximum speed.
2. Press auto intake switch to set the air inlet to recirculation. The auto intake switch indicator and intake switch indicator turn ON.
3. Listen to intake sound and confirm air inlets change.
4. Wait approximately for 5 minutes until ai r inlet switches to fresh air intake.
5. Apply cigarette smoke or similar substance to exhaust gas / outside odor detecting sensor portion.
6. Listen to intake sound and confirm air inlets change to recirculation.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 4.
4.CHECK SELF-DIAGNOSIS WITH CONSULT-III
1. Perform self-diagnosis with CONSULT-III.
2. Check that any DTC is detected.
Is any DTC detected?
YES >> Refer to HAC-45, "DTC Index" and perform the appropriate diagnosis.
NO >> Refer to HAC-135, "
Diagnosis Chart By Symptom" and perform the appropriate diagnosis.
Fan speed Front display (ion indicator)
2nd CLEAN
5th QUICK CLEAN
Revision: 2010 May2011 QX56

HAC-68
< BASIC INSPECTION >[AUTOMATIC AIR CONDITIONING]
SYSTEM SETTING
SYSTEM SETTING
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
FRONT AUTOMATIC AIR CONDITIONING SYST
EM : Temperature Setting Trimmer
(Front)
INFOID:0000000006275896
DESCRIPTION
If the temperature felt by the customer is different from the front air flow temperature controlled by the temper-
ature setting, the A/C auto amp. control temperature can be adjusted to compensate for the temperature set-
ting.
HOW TO SET
With CONSULT-III
Perform “TEMP SET CORRECT” of HVAC work support item.
NOTE:
 When −3.0 °C ( −6 °F) is corrected on the temperature setting set as 25.0 °C (77 °F) the temperature controlled
by A/C auto amp. is 25.0 °C (77 °F) −3.0 °C ( −6 °F) = 22.0 °C (72 °F) and the temperature becomes lower than
the temperature setting.
 When the battery cable is disconnected from the negativ e terminal or when the battery voltage becomes 10
V or less, the setting of the difference between t he set temperature and control temperature may be can-
celled.
FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Foot Position Setting Trimmer
INFOID:0000000006275897
DESCRIPTION
In FOOT mode, the air blowing to DEF can change ON/OFF.
HOW TO SET
With CONSULT-III
Perform the “BLOW SET” of HVAC work support item.
Work support items Display ( °C) Display ( °F)
TEMP SET CORRECT 3.0 6
2.5 5
2.0 4
1.5 3
1.0 2
0.5 1
0 (initial status) 0 (initial status) −0.5 −1
− 1.0 −2
− 1.5 −3
− 2.0 −4
− 2.5 −5
− 3.0 −6
Work support items Display Defroster door position
Auto control Manual control
BLOW SET Mode1 OPEN CLOSE
Mode2 (initial status) OPEN OPEN
Mode3 CLOSE OPEN
Mode4 CLOSE CLOSE
Revision: 2010 May2011 QX56

SYSTEM SETTINGHAC-69
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONING]
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NOTE:
When the battery cable is disconnect ed from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of the discharge air mix ratio in FOOT mode may be cancelled.
FRONT AUTOMATIC AIR CONDITIONING SYS TEM : Inlet Port Memory Function
(FRE)
INFOID:0000000006275898
DESCRIPTION
 If the ignition switch is turned to the OFF position while t he intake switch is set to OFF (fresh air intake), “Per-
form the memory” or “Do not perform the memory” of in take switch OFF (fresh air intake) condition can be
selected.
 If “Perform the memory” was set, the intake switch will be OFF (fresh air intake) when turning the ignition
switch to the ON position again.
 If “Do not perform the memory” was set, the air inlets will be controlled automatically when turning the igni-
tion switch to the ON position again.
HOW TO SET
With CONSULT-III
Perform the “FRE MEMORY SET” of HVAC work support item.
NOTE:
When the battery cable is disconnect ed from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of the FRE memory function may be cancelled.
FRONT AUTOMATIC AIR CONDITIONING SYS TEM : Inlet Port Memory Function
(REC)
INFOID:0000000006275899
DESCRIPTION
 If the ignition switch is turned to the OFF position while the intake switch is set to ON (recirculation), “Per-
form the memory” or “Do not perform the memory” of intake switch ON (recirculation) condition can be
selected.
 If “Perform the memory” was set, the intake switch will be ON (recirculation) when turning the ignition switch
to the ON position again.
 If “Do not perform the memory” was set, the air inlets will be controlled automatically when turning the igni-
tion switch to the ON position again.
HOW TO SET
With CONSULT-III
Perform the “REC MEMORY SET” of HVAC work support item.
NOTE:
When the battery cable is disconnect ed from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of the REC memory function may be cancelled.
REAR AUTOMATIC AIR CONDITIONING SYSTEM
REAR AUTOMATIC AIR CONDITIONING SYST EM : Temperature Setting Trimmer
(Rear)
INFOID:0000000006275900
DESCRIPTION
Work support items Display Setting
FRE MEMORY SET WITHOUT Perform the memory of manual FRE
WITH (initial status) Do not perform the memory of manual FRE (auto control)
Work support items Display Setting
REC MEMORY SET WITHOUT (initial status) Perform the memory of manual REC
WITH Do not perform the memory of manual REC (auto control)
Revision: 2010 May2011 QX56

HAC-70
< BASIC INSPECTION >[AUTOMATIC AIR CONDITIONING]
SYSTEM SETTING
If the temperature felt by the customer is different from
the rear air flow temperature controlled by the temper-
ature setting, the A/C auto amp. control temperature can be adjusted to compensate for the temperature set-
ting.
HOW TO SET
With CONSULT-III
Perform “REAR TEMP SET CORRECT” of HVAC work support item.
NOTE:
 When −3.0 °C ( −6 °F) is corrected on the temperature setting set as 25.0 °C (77 °F) the temperature controlled
by A/C auto amp. is 25.0 °C (77 °F) −3.0 °C ( −6 °F) = 22.0 °C (72 °F) and the temperature becomes lower than
the temperature setting.
 When the battery cable is disconnected from the negativ e terminal or when the battery voltage becomes 10
V or less, the setting of the difference between t he set temperature and control temperature may be can-
celled.
ACCS (ADVANCED CLIM ATE CONTROL SYSTEM)
ACCS (ADVANCED CLIMATE CONTROL SYSTE M) : Exhaust Gas / Outside Odor
Detecting Sensor Sensitiv ity Adjustment Function
INFOID:0000000006275901
DESCRIPTION
According to customer’s sense of smell, exhaust gas / outside odor detecting sensor sensitivity can be
changed.
HOW TO SET
With CONSULT-III
Perform the “GAS SENSOR ADJUSTME NT” of HVAC work support item.
NOTE:
When the battery cable is disconnected from the negativ e terminal or when the battery voltage becomes 10 V
or less, the setting of WORK SUPPORT may be cancelled.
ACCS (ADVANCED CLIMATE CONTROL SYSTEM) : Auto Intake Switch Interlocking
Work support items Display ( °C) Display ( °F)
REAR TEMP SET CORRECT 3.0 6
2.5 5
2.0 4
1.5 3
1.0 2
0.5 1
0 (initial status) 0 (initial status) −0.5 −1
− 1.0 −2
− 1.5 −3
− 2.0 −4
− 2.5 −5
− 3.0 −6
Work support items Display Setting
GAS SENSOR ADJUSTMENT 2 Less sensitive setting than display 1 (REC later than display 1.)
1 Less sensitive setting than normal setting (REC later than normal operation.)
0 (initial status) Normal −1 More sensitive setting than normal setting (REC earlier than normal operation.)
− 2 More sensitive setting than display −1 (REC earlier than display −1.)
Revision: 2010 May2011 QX56

SYSTEM SETTINGHAC-71
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONING]
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Movement Change FunctionINFOID:0000000006275902
DESCRIPTION
Condition for interlocking movement of auto intake switch and A/C switch can be changed. In addition opera-
tion of the auto intake switch, which activates the aut omatic intake control (exhaust gas / outside odor detect-
ing mechanism), can be set to become available when the A/C switch is ON.
HOW TO SET
With CONSULT-III
Perform the “CLEAN SW SET” of HVAC work support item.
NOTE:
When the battery cable is disconnect ed from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of WO RK SUPPORT may be cancelled.
Work support items Display Setting
CLEAN SW SET Mode1 Initial setting
Mode2 Setting 1
Mode3 Setting 2
Mode4 Setting 3
Initial setting
When the auto intake switch is ON, the A/C switch is al
so turned ON in synchronization with the auto intake
switch.
Control of the auto intake switch is function al even when the A/C switch is turned OFF.
Setting 1 When the auto intake switch is ON, the A/C switch is
not turned ON in synchronization with the auto intake
switch.
Control of the auto intake switch is function al even when the A/C switch is turned OFF.
Setting 2 When the auto intake switch is ON, the A/C switch is al
so turned ON in synchronization with the auto intake
switch.
When the A/C switch is turned OFF, the auto intake switch is turned OFF in synchronization with the A/C
switch.
Setting 3 Auto intake switch can be turned ON only when A/C switch is ON.
When the A/C switch is turned OFF, the auto intake switch is turned OFF in synchronization with the A/C
switch.
Revision: 2010 May2011 QX56

HAC-72
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
U1000 CAN COMM CIRCUIT
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006275903
CAN (Controller Area Network) is a serial communication
system for real time application. It is an on-vehicle
multiplex communication system with high data comm unication speed and excellent error detection ability.
Many electronic control units are equipped onto vehicl es, and each control unit shares information and links
with other control units during operation (not independent ). In CAN communication, control units are con-
nected with two communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission
with less wiring. Each control unit transmits/recei ves data but selectively reads required data only.
CAN Communication Signal Chart. Refer to LAN-28, "
CAN COMMUNICATION SYSTEM : CAN Communica-
tion Signal Chart".
DTC LogicINFOID:0000000006275904
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-.III
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-72, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006275905
1.CHECK CAN COMMUNICATION SYSTEM
Check CAN communication system. Refer to LAN-18, "
Trouble Diagnosis Flow Chart".
>> INSPECTION END
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
U1000 CAN COMM CIRCUIT When A/C auto amp. is not transmitting
or receiving CAN communication signal
for 2 or more seconds.
CAN communication system
Revision: 2010 May2011 QX56

U1010 CONTROL UNIT (CAN)HAC-73
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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U1010 CONTROL UNIT (CAN)
DescriptionINFOID:0000000006275906
Initial diagnosis of A/C auto amp.
DTC LogicINFOID:0000000006275907
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-.III
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-73, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006275908
1.REPLACE A/C AUTO AMP.
Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
>> INSPECTION END
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
U1010 CONTROL UNIT (CAN) When detecting error during the initial diag-
nosis of CAN controller of A/C auto amp.A/C auto amp.
Revision: 2010 May2011 QX56

HAC-74
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B2578, B2579 FRONT IN-VEHICLE SENSOR
B2578, B2579 FRONT IN-VEHICLE SENSOR
DTC LogicINFOID:0000000006275909
DTC DETECTION LOGIC
NOTE:
 If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
HAC-
72, "DTC Logic".
 If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC-
73, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-III.
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-106, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006275910
1.CHECK FRONT IN-VEHICLE SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect front in-vehicle sensor connector.
3. Turn ignition switch ON.
4. Check voltage between front in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK FRONT IN-VEHCLE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between front in-vehicle sensor harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
B2578 IN-VEHICLE SENSOR The front in-vehicle sensor recognition temper-
ature is too high.
 Front in-vehicle sensor
 A/C auto amp.
 Harness or connectors
(The sensor circuit is open or short-
ed.)
B2579
The front in-vehicle sensor recognition temper-
ature is too low.
+
−Voltage
(Approx.)
Front in-vehicle sensor
Connector Terminal M73 1 Ground 5 V
Front in-vehicle sensor —Continuity
Connector Terminal
M73 2 Ground Existed
Revision: 2010 May2011 QX56