2011 INFINITI QX56 climate control

HAC-12
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
COMPONENT PARTS
Aspirator
INFOID:0000000006275856
The aspirator generates the vacuum by the air blown from the heater
& cooling unit and draws the air of the passenger room to the front
in-vehicle sensor area via the aspirator duct.
Front Blower MotorINFOID:0000000006275857
The front blower motor utilizes a brush-less motor with a rotating
magnet. Quietness is improved comparing to a conventional motor
(brush motor) that rotates coil while brush functions as contact
points.
Front display Front display indicates operation status of ACCS (advanced climate control
system).
Heater & cooling unit as-
sembly Ionizer Ionizer generates an approximately equal proportional amount of positive
and negative ions in the air.
Preset switch Preset switch is integrated with front A/C control and AV operation switch.
Front A/C control operation signal is transmitted from preset switch to AV
control unit via communication line.
Component Description
RJIA1804E
RJIA2467J
ZHA152H
Revision: 2010 May2011 QX56

HAC-18
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
SYSTEM
FRONT AUTOMATIC AIR CONDITION ING SYSTEM : Door Control
INFOID:0000000006275866
DOOR MOTOR CONTROL
 LCU (Local Control Unit) is built in to each door moto r. And detects door position by PBR (Potentio Balance
Resistor).
 A/C auto amp. communicates with each LCU via comm unication line. And receives each door position feed
back signal from each LCU.
 Each LCU controls each door to the appropriate pos ition depending on the control signal from A/C auto amp.
when the door movement is complete, transmits the signal of door movement completion to A/C auto amp.
SWITCHES AND THEIR CONTROL FUNCTION
With ACCS (Advanced Climate Control System)
JMIIA0817GB
JMIIA0727ZZ
Revision: 2010 May2011 QX56

SYSTEMHAC-19
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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G H
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K L
M A
B
HAC
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*: Inlet status is displayed by indi cator when activating automatic control
Without ACCS (Advanced Climate Control System)
1. Intake door 2. In-cabin microfilter 3. Blower motor
4. Evaporator 5. Air mix door (Driver side/Passenger
side)6. Heater core
7. Foot door 8. Ventilator door 9. Upper ventilator door
10. Defroster door Fresh air intake Recirculation air
Center ventilator Side ventilator Upper ventilator
Foot Rear foot Defroster
Switch/Dial position Door position
Ventilator door Foot
doorDefroster
door Intake
door Upper
ventilator
door Air mix
door
(Driver side) Air mix
door
(Passen-
ger
side)
AUTO switch AUTO — AUTO
MODE switch VENT H E N —
B/L I F N —
FOOT J G O — D/F J G O B —
DEF switch J E P B K —
Intake switch
*FRE — B —
REC — A —
Upper ventila- tor switch ON — L – M —
OFF — K —
Temperature control dial
(Driver side) DUAL
switch:
OFF18.0
°C (60 °F) — C
18.5 °C (61 °F) ⇔
31.5 °C (89 °F) —AUTO
32.0 °C (90 °F) — D
Temperature control dial
(Driver side) DUAL
switch:
ON18.0
°C (60 °F) — C —
18.5 °C (61 °F) ⇔
31.5 °C (89 °F) —AUTO—
32.0 °C (90 °F) — D —
Temperature control dial
(Passenger side) 18.0
°C (60 °F) — C
18.5 °C (61 °F) ⇔
31.5 °C (89 °F) —AUTO
32.0 °C (90 °F) — D
OFF switch AUTO —
Revision: 2010 May2011 QX56

SYSTEMHAC-27
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
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K L
M A
B
HAC
N
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AIR DISTRIBUTION
REAR AUTOMATIC AIR CONDITIONING SYSTEM : Temperature ControlINFOID:0000000006275874
 When ignition switch is in the ON position, A/C auto amp. always
automatically controls temperatur e regardless of rear air condition-
ing operational state.
 A/C auto amp. calculates the target rear air mix door opening
angle depending on set temperature, in-vehicle temperature (rear
side), ambient temperature, and sunload.
 Rear air mix door is controlled depending on the comparison of
current rear air mix door opening angle and target front air mix
door opening angle.
 Regardless of in-vehicle temperature (rear side), ambient tempera-
ture, and sunload, rear air mix door is fixed at the fully cold position
when set temperature is 18.0 °C (60 °F), and at the fully hot position
when set temperature is 32.0 °C (90 °F).
ACCS (ADVANCED CLIMATE CONTROL SYSTEM)
MODE switch VENT C —
B/L D —
FOOT E —
Temperature control dial (front A/C control)
Temperature control switch (rear A/C control) 18.0
°C (60 °F) — A
18.5 °C (61 °F) ⇔
31.5 °C (89 °F) —AUTO
32.0 °C (90 °F) — B
OFF switch AUTO —
Switch/Dial position
Door position
Rear mode door Rear air mix door
Discharge air flow
Mode position Air outlet/distribution
VENT FOOT
100% —
62% 38%
—100%
JMIIA0734GB
Revision: 2010 May2011 QX56

HAC-28
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
SYSTEM
ACCS (ADVANCED CLIMATE CONT ROL SYSTEM) : System Diagram
INFOID:0000000006275875
ACCS (ADVANCED CLIMATE CONTROL SYSTEM) : System DescriptionINFOID:0000000006275876
 ACCS (advanced climate control system) controls pass enger room air. It maintains the cleanliness of the
passenger room air using an in-cabin microfilter and a combination of each of the following functions.
- HAC-28, "
ACCS (ADVANCED CLIMATE CONT ROL SYSTEM) : Automatic Intake Control (Exhaust Gas /
Outside Odor Detecting Mechanism)"
-HAC-29, "ACCS (ADVANCED CLIMATE CONTROL SYSTEM) : Plasmacluster Control"
NOTE:
 Plasmacluster
™ ion technology developed by Sharp Corporation is installed in this item.
 Plasmacluster
™ is a trademark of Sharp Corporation.
 Various operations of ACCS (advanced climate contro l system) are transmitted from preset switch to AV
control unit via communication line and from AV contro l unit to A/C auto amp. via CAN communication. A/C
auto amp. sends each indication information to AV c ontrol unit via CAN communication. AV control unit dis-
plays each indication information that is received.
ACCS (ADVANCED CLIMATE CONTROL SYSTE M) : Automatic Intake Control (Ex-
haust Gas / Outside Odor Detecting Mechanism)
INFOID:0000000006275877
DESCRIPTION
In addition to air inlet automatic control of front automatic air conditioning system, A/C auto amp. controls
automatically air inlet according to signal from ex haust gas / outside odor detecting sensor, so that unpleasant
outside odor does not enter in passenger room.
OPERATION DESCRIPTION
 When pressing auto intake switch while front blower motor is operated and DEF switch is OFF, auto intake switch indicator lamp and intake switch indicator lamp turn ON. Air inlet is fixed to recirculation for approxi-
mately 5 minutes, and then is switched to automatic intake control (exhaust gas / outside odor detecting
mechanism).
 Air inlet switches to recirculation when exhaust gas or outside odor is detected while automatic intake control
(exhaust gas / outside odor detecting mechanism) is operated. After that, air inlet switches to fresh air intake
when exhaust gas or outside odor becomes not detectable.
NOTE:
JMIIA0819GB
Revision: 2010 May2011 QX56

SYSTEMHAC-29
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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HAC
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 Sensitivity of exhaust gas / out side odor detecting sensor can be changed by “GAS SENSOR ADJUST-
MENT” in “WORK SUPPORT” mode of CONSULT-III. Refer to HAC-70, "
ACCS (ADVANCED CLIMATE
CONTROL SYSTEM) : Exhaust Gas / Outside Odor Detecting Sensor Sensitivity Adjustment Function".
 Automatic intake control (exhaust gas / outside odor detecting mechanism) does not operate when ambient
temperature is −2 °C (28 °F) or less. In this case, control is only for control of automatic air inlet of automatic
air conditioning system.
ACCS (ADVANCED CLIMATE CONTROL SYSTEM) : Plasmacluster Control
INFOID:0000000006275878
DESCRIPTION
Plasmacluster™ control eliminates microbes and reduces odor on interior surface by including high density
Plasmacluster
™ ion in air conditioning outlet air flow.
OPERATION DESCRIPTION
 Plasmacluster™ control operates by interlocking to blower motor. Plasmacluster™ control operates when
blower motor operates.
 Control status is displayed on front air conditioning system display screen. Refer to HAC-37, "
ACCS
(ADVANCED CLIMATE CONTROL SYSTEM) : Switch Name and Function".
NOTE:
 Plasmacluster
™ ion technology developed by Sharp Corporation is installed in this item.
 Plasmacluster
™ is a trademark of Sharp Corporation.
Revision: 2010 May2011 QX56

HAC-30
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
OPERATION
OPERATION
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
FRONT AUTOMATIC AIR CONDITIONING S
YSTEM : Switch Name and Function
INFOID:0000000006275881
WITH ACCS (ADVANCED CLIMATE CONTROL SYSTEM)
A/C Display
 Front air conditioning system state is indicated on the display.
 When “STATUS” on multifunction switch is pressed while front air conditioning system is in the ON position,
the display changes to state indication display of fr ont air conditioning system. When front air conditioning
system is operated while navigation system or audio system is displayed, front air conditioning system state
is indicated in the lower portion of display for several seconds.
 When MODE switch is pressed while front air conditioni ng system is in the OFF position, state indication dis-
play is indicated for several seconds.
Display Screen
Controller (Preset Switch)
Switch Operation
JMIIA0821GB
1. AUTO switch 2. Temperature control dial (Driver
side)3. MODE switch
4. OFF switch 5. A/C switch 6. Upper ventilator switch
7. Temperature control dial (passenger side) 8. DUAL switch 9. Intake switch
10. Fan switch 11. DEF switch
JMIIA0823ZZ
Revision: 2010 May2011 QX56

HAC-32
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
OPERATION
WITHOUT ACCS (ADVANCED CLIMATE CONTROL SYSTEM)
A/C Display
 Front air conditioning system state is indicated on the display.
 When “STATUS” on multifunction switch is pressed while
front air conditioning system is in the ON position,
the display changes to state indication display of fr ont air conditioning system. When front air conditioning
system is operated while navigation system or audio system is displayed, front air conditioning system state
is indicated in the lower portion of display for several seconds.
 When MODE switch is pressed while front air conditioni ng system is in the OFF position, state indication dis-
play is indicated for several seconds.
Display Screen
Controller (Preset Switch)
Intake switch Air inlet changes between recirculation (REC)
⇔ fresh air intake (FRE) each time this switch is
pressed.
 Intake switch indicator ON: Recirculation
 Intake switch indicator OFF: Fresh air intake
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.
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 ventilator 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.
JMIIA0719GB
Revision: 2010 May2011 QX56