INFINITI QX56 2011 Factory Service Manual

SYSTEMHAC-25
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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 When rear blower motor is activated, A/C auto amp. gradually increases duty ratio of rear blower motor control signal to prevent a
sudden increase in discharge air flow.
 It takes approximately 8 seconds for air flow to reach HI from LOW.
LOW COOLANT TEMPERATURE STARTING CONTROL
If the engine coolant temperature is 56 °C (133 °F) or less, to prevent
a cold discharged air flow, A/C auto amp. suspends rear blower
motor activation for the maximum 150 seconds depending on target
rear air mix door opening angle. After this, rear blower motor control
signal is increased gradually, and rear blower motor is activated.
HIGH IN-VEHICLE TEMPERATURE STARTING CONTROL
When front evaporator fin temperature is high [intake sensor value is 35°C (95 °F) or more], to prevent a hot
discharged air flow, A/C auto amp. suspends rear blower motor activation for approximately 3 seconds so that
rear evaporator is cooled by refrigerant.
FAN SPEED CONTROL AT DOOR MOTOR OPERATION
When rear mode door motor is activated while air flow is more than the specified value, A/C auto amp.
reduces temporarily fan speed wo t hat rear mode door moves smoothly.
REAR AUTOMATIC AIR CONDITIONING SYSTEM : Air Outlet ControlINFOID:0000000006275872
 While air outlet is in automatic control, A/C auto amp. selects the
rear mode door position depending on a target rear air mix door
angle and outlet air temperature calculated from sunload.
JMIIA0739GB
JMIIA0740GB
JMIIA0733GB
Revision: 2010 May2011 QX56

HAC-26
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
SYSTEM
REAR AUTOMATIC AIR CONDITION ING SYSTEM : Door Control
INFOID:0000000006275873
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
JMIIA0729GB
1. Rear blower motor 2. Rear evaporator 3. Rear air mix door
4. Rear heater core 5. Rear mode door
Recirculation air
Rear ventilator Rear A/C foot
Switch/Dial position Door position
Rear mode door Rear air mix door
AUTO switch Front A/C control
AUTO
Rear A/C control
JMIIA0744ZZ
Revision: 2010 May2011 QX56

SYSTEMHAC-27
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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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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 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

OPERATIONHAC-31
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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AUTO switch Turns the switch indicator lamp and "AUTO" indicator on the display ON, and then front air condition-
ing system becomes the following state.
 Air inlet: Automatic control
 Air outlet: Automatic control
 Blower fan: Automatic control
 Compressor: ON
A/C switch Turns the compressor control (switch indicator) between ON
⇔ OFF each time while front blower fan
is activated.
NOTE:
 When front blower fan is OFF, the compressor control cannot be activated.
 When the compressor control (switch indicator) is in the OFF position, air inlet is fresh air intake (FRE).
Defroster (DEF) switch Turns DEF mode (switch indicator) between ON
⇔ OFF each time.
When DEF switch is pressed while front air conditioning system is in the ON position.
 When DEF mode is turned ON, front air conditioning system becomes the following state.
- Air inlet: Fresh air intake
- Air outlet: DEF
- Blower fan: Automatic control (If fan speed other than AUTO is selected before pressing DEF switch, fan speed is manual control.)
- Compressor: ON
 When DEF mode is turned OFF, front air conditioning system state returns to the previous state before DEF mode is selected. But, the following state is continued.
- Air inlet: Fresh air intake
- Compressor: ON When DEF switch is pressed while front air conditioning system is in the OFF position.
 When DEF mode is turned ON, front air conditioning system becomes the following state.
- Air inlet: Fresh air intake
- Air outlet: DEF
- Blower fan: Automatic control
- Compressor: ON
 When DEF mode is turned OFF, entire front air conditioning system is set to auto mode.
NOTE:
When DEF mode turns ON while front air conditioning system is in automatic control (“AUTO” is indi-
cated), automatic control is released (“AUTO” turns OFF).
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).
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.
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

OPERATIONHAC-33
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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Switch Operation
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. REC switch
10. FRE switch 11. Fan switch 12. DEF switch
JMIIA0822ZZ
AUTO switch Turns the switch indicator lamp and "AUTO" indicator on the display ON, and then front air condition-
ing system becomes the following state.
 Air inlet: Automatic control
 Air outlet: Automatic control
 Blower fan: Automatic control
 Compressor: ON
A/C switch Turns the compressor control (switch indicator) between ON
⇔ OFF each time while front blower fan
is activated.
NOTE:
 When front blower fan is OFF, the compressor control cannot be activated.
 When the compressor control (switch indicator) is in the OFF position, air inlet is fresh air intake (FRE).
Defroster (DEF) switch Turns DEF mode (switch indicator) between ON
⇔ OFF each time.
When DEF switch is pressed while front air conditioning system is in the ON position.
 When DEF mode is turned ON, front air conditioning system becomes the following state.
- Air inlet: Fresh air intake
- Air outlet: DEF
- Blower fan: Automatic control (If fan speed other than AUTO is selected before pressing DEF switch, fan speed is manual control.)
- Compressor: ON
 When DEF mode is turned OFF, front air conditioning system state returns to the previous state
before DEF mode is selected. But, the following state is continued.
- Air inlet: Fresh air intake
- Compressor: ON
When DEF switch is pressed while front air conditioning system is in the OFF position.
 When DEF mode is turned ON, front air conditioning system becomes the following state.
- Air inlet: Fresh air intake
- Air outlet: DEF
- Blower fan: Automatic control
- Compressor: ON
 When DEF mode is turned OFF, entire front air conditioning system is set to auto mode.
NOTE:
When DEF mode turns ON while front air conditioning system is in automatic control (“AUTO” is indi-
cated), automatic control is released (“AUTO” turns OFF).
Revision: 2010 May2011 QX56

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