2011 INFINITI QX56 Factory Service Manual

buttons immobilizer fuel tank removal tires brake pads timing belt

Page 3121 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMHAC-15
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
C
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G H
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M A
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HAC
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- HAC-17, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Air Outlet Control"
-HAC-17, "FRONT AUTOMATIC A

SYSTEMHAC-15
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
C
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G H
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M A
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HAC
N
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- HAC-17, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Air Outlet Control"
-HAC-17, "FRONT AUTOMATIC AIR CONDITIONIN G SYSTEM : Compressor Control"
-HAC-18, "FRONT AUTOMATIC AIR CONDITION ING SYSTEM : Door Control"
-HAC-21, "FRONT AUTOMATIC AIR CONDITIONIN G SYSTEM : Temperature Control"
- Correction for input value of each sensor
Ambient sensor (setting temperature correction) A/C auto amp. controls passenger room temperature so that the optimum level always matches the temper-
ature level that passenger may feel. Correction is applied to the target temperature that is set using temper-
ature control dial, according to ambient temperature detected by ambient sensor.
Front in-vehicle sensor [in-vehicle temperature (front side) correction]
Passenger room temperature (front side) detected by front in-vehicle sensor is corrected for each front air
conditioning control (driver side and passenger side)
Intake sensor (intake temperature correction)
A/C auto amp. performs correction to change recognition intake temperature of A/C auto amp. quickly when
difference is large between recognition intake temperat ure and intake temperature detected by intake tem-
perature sensor. The correction is performed to change recognition intake temperature slowly when differ-
ence is small.
Sunload sensor (sunload amount correction) Sunload amount detected by sunload sensor is correc ted for each air conditioning control (driver side and
passenger side).
A/C auto amp. performs correction to change recogni tion sunload amount of A/C auto amp. slowly when
sunload amount changes quickly, for exampl e when entering or exiting a tunnel.
Control by ECM
- Cooling fan control
Refer to EC-41, "
COOLING FAN CONTROL : System Description".
- Air conditioning cut control.
Refer to EC-47, "
AIR CONDITIONING CUT CONTRO L : System Description".
Control by IPDM E/R- Relay control
Refer to PCS-5, "
RELAY CONTROL SYSTEM : System Description".
- Cooling fan control
Refer to PCS-8, "
POWER CONTROL SYSTEM : System Description".
Front A/C control (preset switch) transmits the co mmands for front automatic air conditioning system opera-
tion to AV control unit via communication line, then AV control unit transmits the commands to A/C auto amp.
via CAN communication. A/C auto amp. transmits each indication information to AV control unit via CAN
communication. AV control unit displays each indication information that is received.
FRONT AUTOMATIC AIR CONDITIONIN G SYSTEM : Air Flow ControlINFOID:0000000006275862
DESCRIPTION
A/C auto amp. changes duty ratio of blower motor dr ive signal and controls air flow continuously. When air
flow is increased, duty ratio of front blower moto r control signal gradually increases to prevent a sudden
increase in air flow.
In addition to manual control and automatic control, air flow control is consist of starting fan speed control,
low coolant temperature starting control, high in-vehi cle temperature starting control and fan speed control at
door motor operation
AUTOMATIC AIR FLOW CONTROL
A/C auto amp. decides target air flow depending on target front air mix door opening angle.
A/C auto amp. changes duty ratio of front blower moto r control signal and controls the air flow continuously
so that air flow matches to target air flow.
Revision: 2010 May2011 QX56

Page 3122 of 5598

INFINITI QX56 2011 Factory Service Manual
HAC-16
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
SYSTEM
When air outlet is VENT or B/L, the minimum air flow is changed
depending on sunload.
STARTING AIR FLOW CONTROL
When front blower

Page 3123 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMHAC-17
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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G H
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M A
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HAC
N
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FRONT AUTOMATIC AIR CONDITIONIN G SYSTEM : Air Outlet ControlINFOID:0000000006275864
While air out

SYSTEMHAC-17
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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FRONT AUTOMATIC AIR CONDITIONIN G SYSTEM : Air Outlet ControlINFOID:0000000006275864
While air outlet is in automatic control, A/C auto amp. selects the
front mode door position depending on a target front air mix door
angle and outlet air temperature calculated from sunload.
If ambient temperature is excessively low, D/F is selected to pre- vent windshield fogging when air outlet is set to FOOT.
FRONT AUTOMATIC AIR CONDITIONIN G SYSTEM : Compressor Control
INFOID:0000000006275865
DESCRIPTION
When the compressor activation condition is satisfied while blower motor is activated, A/C auto amp. trans-
mits A/C ON signal and blower fan ON signal to ECM via CAN communication.
ECM judges that the compressor can be activated depending on each sensors state (refrigerant pressure sensor signal, and others). And transmits A/C compress or request signal to IPDM E/R via CAN communica-
tion.
IPDM E/R turns A/C relay ON and activates the compressor depending on request from ECM.
COMPRESSOR PROTECTION CONTROL AT PRESSURE MALFUNCTION
When high-pressure side value that is detected by refri gerant pressure sensor is as per the following state,
ECM requests IPDM E/R to turn A/C relay OFF and stops the compressor.
3.12 MPa (31.82 kg/cm
2, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
2.74 MPa (27.95 kg/cm
2, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
0.14 MPa (1.43 kg/cm
2, 20.3 psi) or less
COMPRESSOR OIL CIRCULATION CONTROL
When the engine starts while the engine coolant temperature is 56 °C (133 °F) or less, ECM activates the com-
pressor for approximately 6 seconds and circulates the compressor lubricant once.
LOW TEMPERATURE PROTECTION CONTROL
When intake sensor detects that front evaporator fin temperature is
2.5 °C (37 °F) or less, A/C auto amp. requests ECM to turn com-
pressor OFF, and stops the compressor.
When the front evaporator fin temperature returns to 5.0 °C (41 °F)
or more, the compressor is activated.
OPERATING RATE CONTROL
When set temperature is other than fully cold or air out let is “VENT”, “B/L” or “FOOT” A/C auto amp. controls
the compressor activation depending on ambient temperature.
AIR CONDITIONING CUT CONTROL
When set engine is running is excessively high load conditi on, ECM requests IPDM E/R to turn A/C relay OFF,
and stops the compressor. Refer to EC-47, "
AIR CONDITIONING CUT CONTRO L : System Description" for
details.
JMIIA0730GB
JMIIA0742GB
Revision: 2010 May2011 QX56

Page 3124 of 5598

INFINITI QX56 2011 Factory Service Manual
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

Page 3125 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMHAC-19
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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M A
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HAC
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*: Inlet status is displayed by indi cator when activating automatic control
Without ACCS (Advanced

Page 3126 of 5598

INFINITI QX56 2011 Factory Service Manual
HAC-20
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
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. Fo

Page 3127 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMHAC-21
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
C
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G H
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M A
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HAC
N
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*: Inlet status is displayed by indi cator when activating automatic control
AIR DISTRIBUTION
FRONT

SYSTEMHAC-21
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
C
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G H
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M A
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HAC
N
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*: Inlet status is displayed by indi cator when activating automatic control
AIR DISTRIBUTION
FRONT AUTOMATIC AIR CONDITIONIN G SYSTEM : Temperature Control
INFOID:0000000006275867
When ignition switch is in the ON position, A/C auto amp. always
automatically controls temperatur e regardless of front air condi-
tioning operational state.
A/C auto amp. calculates the target front air mix door opening angle depending on set temperature, in-vehicle temperature (front
side), ambient temperature, and sunload.
Front air mix door is controlled depending on the comparison of current front air mix door opening angle and target front air mix
door opening angle.
Regardless of in-vehicle temperature (front side), ambient temper- ature, and sunload, front air mix door is fixed at the fully cold posi-
tion when set temperature is 18.0 °C (60 °F), and at the fully hot
position when set temperature is 32.0 °C (90 °F).
FRONT AUTOMATIC AIR CONDITI ONING SYSTEM : Fail-safeINFOID:0000000006275868
FAIL-SAFE FUNCTION
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 —
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)
Discharge air flow
Mode position Condition Air outlet/distribution
VENT FOOT DEF
Center Side Front Rear
DUAL and Up-
per ventilator
switch: OFF 50% 50% — — —
30% 30% 26% 14% —
— 14% 36% 23% 27%
— 12% 32% 20% 36%
—11%——89%
JMIIA0731GB
Revision: 2010 May2011 QX56

Page 3128 of 5598

INFINITI QX56 2011 Factory Service Manual
HAC-22
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
SYSTEM
If a communication error exists between the A/C auto
amp., and the AV control unit and preset switch for 30
seconds or longer, air co

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