2011 INFINITI QX56 air condition

HAC-34
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
OPERATION
DUAL switch Turns left and right ventilation temperature separately control (switch indicator) between ON
⇔
OFF each time.
 When DUAL switch indicator is ON, the driver side and passenger side temperatures can each be set independently.
 When DUAL switch indicator is OFF, the driver side outlet and setting temperature is applied to both
sides.
 Left and right ventilation temperature separately control is cancelled by turning the DEF mode ON.
NOTE:
When front air conditioning system is in the OFF position, left and right ventilation temperature sepa-
rately control can be selected only while front air conditioning system state (when MODE switch is
pressed) is indicated on the display.
Fan switch (UP/DOWN) Blower fan speed is manually controlled with these switches. Seven speeds are available for manual
control (as shown on the display screen)
NOTE:
 When fan switch is pressed while front air conditioning system is in OFF, front air conditioning sys-
tem is activated. (Compressor control state returns to the previous state before front air condition-
ing system OFF.)
 When fan switch is pressed while front air conditioning system is in automatic control (“AUTO” is
indicated), automatic control is released (“AUTO” turns OFF).
FRE switch  Air inlet is selected to fresh air intake (FRE) by pressing this switch.
- FRE indicator: ON
- REC indicator: OFF
 When FRE indicator is ON, pressing the FRE switch for approximately 1.5 seconds or more, and
then the FRE and REC switch indicators blink twice and the system is switched to the automatic
control.
NOTE:
When front air conditioning system is in the OFF position, air inlet can be selected.
MODE switch Selects air outlet sequentially from VENT
⇒ B/L ⇒ FOOT ⇒ D/F ⇒ VENT each time.
NOTE:
 When front air conditioning system is in the OFF position, air outlet can be selected.
 When MODE switch is pressed while front air conditioning system is in automatic control (“AUTO” is indicated), automatic control is released (“AUTO” turns OFF).
OFF switch  Turns front air conditioning system OFF.
 When front air conditioning system turns OFF, air inlet and air outlet become the automatic control.
REC switch  Air inlet is selected to fresh air intake (REC) by pressing this switch.
- REC indicator: ON
- FRE indicator: OFF
 When REC indicator is ON, pressing the REC switch for approximately 1.5 seconds or more, and
then the FRE and REC switch indicators blink twice and the system is switched to the automatic
control.
NOTE:
 When front air conditioning system is in the OFF position, air inlet can be selected.
 When MODE switch and DEF switch is in the D/F or DEF position, air inlet cannot be selected to recirculation (REC).
Temperature control dial
(driver side)  Selects set temperature within a range between 18.0
°C (60 °F) – 32.0 °C (90 °F) at a rate of 0.5 °C
(1.0 °F) each time the dial is rotated.
- Clockwise rotation: Set temperature increases.
- Counterclockwise rotation: Set temperature decreases.
NOTE:
When front air conditioning system is in the OFF position, set temperature can be selected only while
front air conditioning system state (when MODE switch is pressed) is indicated on the display.
Revision: 2010 May2011 QX56

OPERATIONHAC-35
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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REAR AUTOMATIC AIR CONDITIONING SYSTEM
REAR AUTOMATIC AIR CONDITIONING SY STEM : Switch Name and Function
INFOID:0000000006275882
FRONT CONTOLLER OPERATION
A/C Display
 Rear air conditioning system state is indicated on the front display.
 When REAR switch is pressed while air conditioning syst em is in the ON position, the front display changes
to state indication display (rear contro l mode) of rear air conditioning system.
Display screen
Controller (Preset Switch)
With ACCS (advanced climate control system)
Temperature control dial
(passenger side)  Selects set temperature within a range between 18.0
°C (60 °F) – 32.0 °C (90 °F) at a rate of 0.5 °C
(1.0 °F) each time the dial is rotated.
- Clockwise rotation: Set temperature increases.
- Counterclockwise rotation: Set temperature decreases.
 When the temperature control dial is turned, DUAL switch indicator turns ON.
NOTE:
When front air conditioning system is in the OFF position, set temperature can be selected only while
front air conditioning system state (when MODE switch is pressed) is indicated on the display.
Upper ventilator switch Turns the upper ventila
tor control (switch indicator) between ON ⇔ OFF each time while front blower
fan is activated.
NOTE:
 When front air conditioning system is in the OFF position and air outlet is DEF position, upper ven- tilator control cannot be activated.
 When front air conditioning system is in the OFF position, upper ventilator control can be selected only while front air conditioning system state (when MODE switch is pressed) is indicated on the
display.
JMIIA0720ZZ
JMIIA0825ZZ
1. AUTO switch 2. Temperature control dial (Driver
side)3. MODE switch
4. REAR switch 5. OFF switch 6. Fan switch
Revision: 2010 May2011 QX56

HAC-36
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
OPERATION
Without ACCS (advanced
climate control system)
Switch Operation
REAR CONTROLLER OPERATION
Controller (Rear A/C Control)
JMIIA0824ZZ
1. AUTO switch 2. Temperature control dial (Driver
side)3. MODE switch
4. REAR switch 5. OFF switch 6. Fan switch
AUTO switch Turns the switch indicator lamp and "AUTO" indicator on the front display ON, and then rear air con-
ditioning system becomes the following state.
 Air outlet: Automatic control
 Blower fan: Automatic control
 Compressor: ON
Fan switch (UP/DOWN) Blower fan speed is manually controlled with these switches. Seven speeds are available for manual
control (as shown on the display screen)
NOTE:
When fan switch is pressed while air conditioning system is in automatic control (“AUTO” is indicated),
automatic control is rele
ased (“AUTO” turns OFF).
MODE switch Selects air outlet sequentially from VENT
⇒ B/L ⇒ FOOT ⇒ VENT each time.
NOTE:
When MODE switch is pressed while air conditioning system is in automatic control (“AUTO” is indi-
cated), automatic control is released (“AUTO” turns OFF).
OFF switch  Turns rear air conditioning system OFF. (When rear control mode is ON)
 When rear air conditioning system turns OFF, air outlet become the automatic control.
REAR switch  Turns the switch indicator lamp and rear control mode on the front display ON, and then rear air
conditioning system becomes the following state.
- Air outlet: Automatic control
- Blower fan: Automatic control
- Compressor: ON
 Rear control mode is released when switch is pressed again (rear air conditioning system operates continuously).
Temperature control dial
(driver side)  Selects set temperature within a range between 18.0
°C (60 °F) – 32.0 °C (90 °F) at a rate of 0.5 °C
(1.0 °F) each time the dial is rotated.
- Clockwise rotation: Set temperature increases.
- Counterclockwise rotation: Set temperature decreases.
Revision: 2010 May2011 QX56

OPERATIONHAC-37
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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Switch Operation
ACCS (ADVANCED CLIMATE CONTROL SYSTEM)
ACCS (ADVANCED CLIMATE CONTROL SY
STEM) : Switch Name and Function
INFOID:0000000006275883
OPERATION AND DISPLAY
Plasmacluster™ ion display
 Plasmacluster™ control state is indicated on the front display.
 Plasmacluster
™ ion display is switched as shown in the figure depending on air flow.
NOTE:
 Plasmacluster
™ ion technology developed by Sharp Corporation is installed in this item.
 Plasmacluster
™ is a trademark of Sharp Corporation.
1. OFF switch 2. Fan switch 3. Display
4. Temperature control switch 5. MODE switch 6. AUTO switch
JMIIA0718ZZ
AUTO switch Turns the switch indicator lamp and "AUTO" indicator on the display ON, and then rear air condition-
ing system becomes the following state.
 Air outlet: Automatic control
 Blower fan: Automatic control
 Compressor: ON
Fan switch (UP/DOWN) Blower fan speed is manually controlled with these switches. Seven speeds are available for manual
control (as shown on the display screen)
NOTE:
When fan switch is pressed while air conditioning system is in automatic control (“AUTO” is indicated),
automatic control is rele
ased (“AUTO” turns OFF).
MODE switch Selects air outlet sequentially from VENT
⇒ B/L ⇒ FOOT ⇒ VENT each time.
NOTE:
When MODE switch is pressed while air conditioning system is in automatic control (“AUTO” is indi-
cated), automatic control is released (“AUTO” turns OFF).
OFF switch  Turns rear air conditioning system OFF.
 When rear air conditioning system turns OFF, air outlet become the automatic control.
Temperature control
switch Setting temperature is selected using this switch with in a range between 18.0
°C (60 °F) – 32.0 °C
(90 °F) at a rate of 0.5 °C (1.0 °F) per adjustment.
 : Press: Set temperature increases.
 : Press: Set temperature decreases.
Revision: 2010 May2011 QX56

HAC-38
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
OPERATION
- When air flow is small
- When air flow is large
Controller (Preset Switch)
JMIIA0410ZZ
JMIIA0411ZZ
1. Auto intake switch
Switch name Function
Auto intake switch  Automatic intake control (exhaust gas / outside odor detecting mechanism) mode (switch indicator)
changes between ON ⇔ OFF each time when auto intake switch is pressed while front blower mo-
tor is activated.
 When auto intake switch turns ON, front air conditioning system becomes the following status.
- A/C switch: ON
- Air inlet: Recirculation [After approximately 5 minutes, air inlet is switched to automatic intake con- trol (exhaust gas / outside odor detecting mechanism).]
 When auto intake switch turns ON ⇒ OFF, air inlet becomes the fresh air intake.
NOTE:
 Interlocking condition of A/C switch can be changed. Refer to HAC-70, "
ACCS (ADVANCED CLI-
MATE CONTROL SYSTEM) : Auto Intake Switch Interlocking Movement Change Function".
 Auto intake switch does not turn ON during the following status.
- Air outlet: DEF
- Ambient temperature: −2 °C (28 °F) or less
JMIIA0826ZZ
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (HVAC)HAC-39
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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DIAGNOSIS SYSTEM (HVAC)
DescriptionINFOID:0000000006275884
Air conditioning system performs self-diagnosis, operat ion check, function diagnosis, and various settings
using diagnosis function of each control unit.
CONSULT-III FunctionINFOID:0000000006275885
CONSULT-III performs the following functions via CAN communication with A/C auto amp.
NOTE:
Diagnosis should be performed with engine running. D oor motor operation speeds become slower and NO
results may be returned even for normal operation if battery voltage drops below 12 V during self-diagnosis.
SELF-DIAGNOSIS RESULTS
Refer to HAC-45, "DTC Index".
DATA MONITOR
Display item list
ECU Diagnostic item
(CONSULT-III)
A/C auto amp. HVACSelf Diagnostic Result
Data Monitor
Active Test
Work support
AV c o n t r o l u n i t MULTI AV
Self Diagnostic Result
Multi AV system on board diagnosis function
ECM ENGINESelf Diagnostic Result
Data Monitor
IPDM E/R IPDM E/RSelf Diagnostic Result
Data Monitor
Auto active test
Diagnostic mode Description
Self diagnostic result Displays the diagnosis results judged by A/C auto amp.
Data monitor Displays the input/output signal of A/C auto amp.
Active test The signals used to activate each device are forcibly supplied from A/C auto amp.
Work support Changes the setting for each setting function.
ECU identification Displays the part number of A/C auto amp.
Monitor item [Unit] Description
AMB TEMP SEN [ °C ( °F)] Ambient sensor value converted from ambient sensor signal received from ambient sen-
sor
IN-VEH TEMP [ °C ( °F)] Front in-vehicle sensor value converted from front in-vehicle sensor signal received from
front in-vehicle sensor
INT TEMP SEN [ °C ( °F)] Intake sensor value converted from intake sensor signal received from intake sensor
SUNLOAD SEN [w/m
2]Sunload sensor value converted from sunload sensor signal (driver side) received from
sunload sensor
AMB SEN CAL [ °C ( °F)] Ambient temperature value calculated by A/C auto amp.
IN-VEH CAL [ °C ( °F)] In-vehicle temperature (front side) value calculated by A/C auto amp.
INT TEMP CAL [ °C ( °F)] Front evaporator fin temperature value calculated by A/C auto amp.
SUNL SEN CAL [w/m
2]Sunload value (driver side) calculated by A/C auto amp.
Revision: 2010 May2011 QX56

HAC-40
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
DIAGNOSIS SYSTEM (HVAC)
ACTIVE TEST
Check each output device
COMP REQ SIG [On/Off] Displays A/C switch ON/OFF status transmitted to other units via CAN communication
FAN REQ SIG [On/Off]Displays front blower motor ON/OFF status transmitted to other units via CAN commu-
nication
FAN DUTY Duty ratio of front blower motor judged by A/C auto amp.
XM Target discharge front air temperature (driver side) judged by A/C auto amp. depending
on the temperature setting and the value from each sensor
PASS SUNL CAL [w/m
2]Sunload value (passenger side) calculated by A/C auto amp.
PASS SUNLOAD SEN [w/m
2]Sunload sensor value converted from sunload sensor signal (passenger side) received
from sunload sensor
PA TARGET A/TEMP Target discharge front air temperature (passenger side) judged by A/C auto amp. de-
pending on the temperature setting and the value from each sensor
RRIN TEMP SEN [ °C ( °F)] Rear in-vehicle sensor value converted from rear in-vehicle sensor signal received from
rear in-vehicle sensor.
RRIN TEMP CAL [ °C ( °F)] In-vehicle temperature (rear side) value calculated by A/C auto amp.
RR INT TMP CL [ °C ( °F)] Rear evaporator fin temperature value calculated by A/C auto amp.
RRFAN REQ SIG [On/Off] Displays rear blower motor ON/OFF status transmitted to other units via CAN communi-
cation
RR FAN DUTY Duty ratio of rear blower motor judged by A/C auto amp.
RR XM Target discharge rear air temperature (driver side) judged by A/C auto amp. depending
on the temperature setting and the value from each sensor
ENG COOL TEMP [ °C ( °F)] Engine coolant temperature signal value received from ECM via CAN communication
VEHICLE SPEED [km/h
(mph)] Vehicle speed signal value received from combination meter via CAN communication
Monitor item [Unit] Description
Te s t i t e m D e s c r i p t i o n
HVAC TEST The operation check of air conditioning system can be performed by selecting the mode.
Refer to the following table for the conditions of each mode.
Te s t i t e m
MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7
Front mode door motor posi-
tion VENT VENT B/L B/L FOOT D/F DEF
Intake door motor position REC REC 20% FRE 20% FRE FRE FRE FRE
Front air mix door motor (driver
side) position FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Front air mix door motor (pas-
senger side) position FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Front blower motor control sig-
nal duty ratio 35% 35% 59% 59% 89% 89% 35%
Magnet clutch ON ON ON ON OFF OFF ON
Upper ventilator door motor
position OPEN CLOSE OPEN CLOSE CLOSE CLOSE CLOSE
Rear mode door motor posi-
tion VENT VENT B/L B/L FOOT FOOT FOOT
Rear air mix door motor posi-
tion FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Rear blower motor control sig-
nal duty ratio 35% 35% 59% 59% 89% 89% 35%
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (HVAC)HAC-41
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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*: With ACCS (advanced climate control system)
NOTE:
Perform the inspection of each output device after starting the engine because the compressor is operated.
WORK SUPPORT
*: With ACCS (advanced climate control system)
NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of WORK SUPPORT may be cancelled.
Rear A/C relay ON ON ON ON OFF OFF ON
Ionizer
*ON ON ON ON ON ON OFF
Front display (Ion mode)
*CLEAN CLEAN QUICK
CLEAN QUICK
CLEAN QUICK
CLEAN QUICK
CLEAN OFF
Te s t i t e m
MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7
Work item Description Refer to
TEMP SET CORRECT Setting change of temperature setting trimmer (front) can be per-
formed. HAC-68, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM :
Temperature Setting Trim-
mer (Front)"
BLOWER SET Setting change of foot position setting trimmer can be performed.
HAC-68, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM : Foot
Position Setting Trimmer"
REC MEMORY SET
Setting change of inlet port memory function (REC) can be per-
formed. HAC-69, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM : Inlet Port
Memory Function (REC)"
FRE MEMORY SET
Setting change of inlet port memory function (FRE) can be per-
formed. HAC-69, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM : Inlet Port
Memory Function (FRE)"
GAS SENSOR ADJUSTMENT*Setting change of exhaust gas / outside odor detecting sensor sensi-
tivity adjustment function can be performed. HAC-70, "
ACCS (AD-
VANCED CLIMATE CON-
TROL SYSTEM) :
Exhaust Gas / Outside
Odor Detecting Sensor
Sensitivity Adjustment
Function"
CLEAN SW SET*Setting change of auto intake switch interlocking movement change
function can be performed.
HAC-70, "
ACCS (AD-
VANCED CLIMATE CON-
TROL SYSTEM) : Auto
Intake Switch Interlocking
Movement Change Func-
tion"
REAR TEMP SET CORRECT
Setting change of temperature setting trimmer (rear) can be per-
formed. HAC-68, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM :
Temperature Setting Trim-
mer (Front)"
Revision: 2010 May2011 QX56