air condition INFINITI QX56 2011 Factory Service Manual

REFRIGERANTHA-19
< BASIC INSPECTION >
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Never look directly into UV lamp light source.
NOTE:
 For continuous operating time of UV lamp, fo llow the manufacturer operating instructions.
 Illuminate piping joints from different angles us ing UV lamp and check that there is no leakage.
 Use a mirror in area that is difficult to see to check refrigerant leakage.
 Refrigerant leakage from evaporator can be detected by soaking cotton swab or a similar material with
drain hose water and illuminating it using UV lamp.
 Dust, dirt, and packing materials adhesive used for condenser, evaporator, and other locations may flu- oresce. Be careful not to misidentify leakage.
5. Repair or replace parts where refrigerant leak age occurs and wipe off fluorescent leak detection dye.
NOTE:
Completely wipe off fluorescent leak detection dy e from gaps between parts, screw threads, and others
using a cotton swab or similar materials.
6. Use a UV lamp to check that no fluorescent leak detection dye remains after finishing work. WARNING:
Never look directly into UV lamp light source.
NOTE:
 For continuous operating time of UV lamp, fo llow the manufacturer operating instructions.
 Dust, dirt, and packing materials adhesive used for condenser, evaporator, and other locations may flu-
oresce. Be careful not to misidentify leakage.
CHECK REFRIGERANT LEAKAGE USIN G ELECTRICAL LEAK DETECTOR
WARNING:
Never check refrigerant leakage while the engine is running.
CAUTION:
Be careful of the following items so that in accurate checks or misidentifications are avoided.
 Never allow refrigerant vapor, shop chemical vapors, cigarette smoke, or others around the vehicle.
 Always check refrigerant leakage in a low air flow environment so that refrigerant may not disperse
when leakage occurs.
1. Stop the engine.
2. Connect recovery/recycling/recharging equipment or manifold gauge set to A/C service valve.
3. Check that A/C refrigerant pressure is 345 kPa (3.52 kg/cm
2, 50 psi) or more when temperature is 16 °C
(61 °F) or more. When pressure is lower than the spec ified value, recycle refrigerant completely and fill
refrigerant to the specified level.
NOTE:
Leakages may not be detected if A/C refri gerant pressure is 345 kPa (3.52 kg/cm
2, 50 psi) or less when
temperature is less than 16 °C (61 °F).
4. Clean area where refrigerant leakage check is per formed, and check refrigerant leakage along all sur-
faces of pipe connections and A/C system com ponents using electrical leak detector probe.
CAUTION:
 Continue checking when a leakage is found. Always continue and complete checking along all
pipe connections and A/C system co mponents for additional leakage.
 When a leakage is detected, clean leakage area using compressed air and check again.
 When checking leakage of cooling unit inside, al ways clean inside of drain hose so that the
probe surface may not be exposed to water or dirt.
NOTE:
 Always check leakage starting from high-pressure side and continue to low-pressure side.
 When checking leakage of cooling unit inside, operate blower fan motor for 15 minutes or more at the maximum fan speed while the engine is stopped, and then insert electrical leak detector probe into drain
hose and hold for 10 minutes or more.
 When disconnecting shut-off valve that is connected to A/C service valve, always evacuate remaining
refrigerant so that misidentification can be avoided.
5. Repair or replace parts where refrigerant leak age is detected. (Leakage is detected but leakage area is
unknown. GO TO 6.)
6. Start the engine and set A/C control in the following conditions.  A/C switch ON
 Air flow: VENT (ventilation)
 Intake door position: Recirculation
Revision: 2010 May2011 QX56

PERFORMANCE TESTHA-25
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PERFORMANCE TEST
InspectionINFOID:0000000006276158
INSPECTION PROCEDURE
1. Connect recovery/recycling/recharging equipment (for HFC-134a) or manifold gauge.
2. Start the engine, and set to the following condition.
Test condition
3. Maintain test condition until A/C system becomes stable. (Approximately 10 minutes)
4. Check that test results of “recirculating-to-disc harge air temperature” and “ambient air temperature-to-
operating pressure” are within the specified value.
5. When test results are within the specified value, inspection is complete. If any of test result is out of the specified value, perform diagnosis by gauge pressure. Refer to HA-27,
"Symptom Table".
RECIRCULATING-TO-DISCHARGE AIR TEMPERATURE TABLE
FRONT
REAR
Surrounding condition Indoors or in the shade (in a well-ventilated place)
Vehicle conditionDoor Closed
Door glass Full open
Hood Open
Engine speed Idle speed
A/C condition (front/rear) Temperature control switch or dial Full cold
A/C switch ON
Air outlet VENT (ventilation)
Intake door position Recirculation
Fan speed Maximum speed set
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature from center ventilator
°C ( °F)
Relative humidity
% Air temperature
°C ( °F)
50 – 60 20 (68) 6.8 - 8.8 (44 - 48)
25 (77) 10.4 -
12.9 (51 - 55)
30 (86) 13.9 - 16.9 (57 - 63)
35 (95) 17.3 - 20.8 (63 - 70)
60 – 70 20 (68) 8.8 - 10.8 (48 - 52)
25 (77) 12.9 -
15.4 (55 - 60)
30 (86) 16.9 - 19.9 (63 - 68)
35 (95) 20.8 - 24.3 (70 - 76)
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature from rear ventilator grille A RH*
°C ( °F)
Relative humidity
% Air temperature
°C ( °F)
50 – 60 20 (68) 11.4 -
13.4 (53 - 56)
25 (77) 15.8 - 18.3 (60 - 65)
30 (86) 20.9 - 23.9 (70 - 75)
35 (95) 25.9 - 29.4 (79 - 85)
Revision: 2010 May2011 QX56

HAC-1
VENTILATION, HEATER & AIR CONDITIONER
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CONTENTS
HEATER & AIR CONDITIONING CONTROL SYSTEM
AUTOMATIC AIR CONDITIONING
PRECAUTION ................ ...............................
5
PRECAUTIONS .............................................. .....5
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
5
SYSTEM DESCRIPTION ..............................6
COMPONENT PARTS ................................... .....6
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ......
6
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Component Parts Location .............................
6
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Component Description ..................................
7
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ......
8
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Component Parts Location .............................
9
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Component Description ................................
10
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) ...................................................................... ....
10
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : Component Parts Location ..........................
11
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : Component Description ...............................
11
Aspirator ..................................................................12
Front Blower Motor ..................................................12
Rear Blower Motor ..................................................13
Refrigerant Pressure Sensor ...................................13
SYSTEM .............................................................14
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ....
14
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : System Diagram ...........................................
14
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : System Description .......................................
14
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Flow Control ............................................
15
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Inlet Control .............................................
16
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Outlet Control ..........................................
17
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Compressor Control ......................................
17
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Door Control ..................................................
18
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Temperature Control .....................................
21
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Fail-safe ........................................................
21
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ....
22
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : System Diagram ...........................................
23
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : System Description .......................................
23
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Flow Control ............................................
24
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Outlet Control ..........................................
25
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Door Control ..................................................
26
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Temperature Control .....................................
27
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) ....................................................................... ....
27
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : System Diagram ..........................................
28
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : System Description ......................................
28
Revision: 2010 May2011 QX56

HAC-2
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : Automatic Intake Control (Exhaust Gas /
Outside Odor Detecting Mechanism) .....................
28
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : Plasmacluster Control .................................
29
OPERATION ......................................................30
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ...
30
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Switch Name and Function ....................... ...
30
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ...
35
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Switch Name and Function ....................... ...
35
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) ....................................................................... ...
37
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : Switch Name and Function .........................
37
DIAGNOSIS SYSTEM (HVAC) ..........................39
Description ........................................................... ...39
CONSULT-III Function ...........................................39
ECU DIAGNOSIS INFORMATION ..............42
A/C AUTO AMP. ............................................. ...42
Reference Value .................................................. ...42
Fail-safe ..................................................................45
DTC Index ..............................................................45
ECM, IPDM E/R .................................................47
List of ECU Reference ......................................... ...47
WIRING DIAGRAM .....................................48
AUTOMATIC AIR CONDITIONING SYSTEM ...48
Wiring Diagram .................................................... ...48
BASIC INSPECTION ...................................60
DIAGNOSIS AND REPAIR WORK FLOW ..... ...60
Work Flow ............................................................ ...60
OPERATION INSPECTION ............................ ...62
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ...
62
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Work Procedure ........................................ ...
62
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ...
64
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Work Procedure ........................................ ...
64
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) ....................................................................... ...
66
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : Work Procedure ..........................................
66
SYSTEM SETTING ............................................68
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ...
68
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Temperature Setting Trimmer (Front) ..........
68
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Foot Position Setting Trimmer ......................
68
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Inlet Port Memory Function (FRE) ................
69
FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Inlet Port Memory Function (REC) ...............
69
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM ........................................................................ ...
69
REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Temperature Setting Trimmer (Rear) ...........
69
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) ....................................................................... ...
70
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : Exhaust Gas / Outside Odor Detecting
Sensor Sensitivity Adjustment Function ..................
70
ACCS (ADVANCED CLIMATE CONTROL SYS-
TEM) : Auto Intake Switch Interlocking Movement
Change Function .....................................................
70
DTC/CIRCUIT DIAGNOSIS ........................72
U1000 CAN COMM CIRCUIT ......................... ...72
Description ........................................................... ...72
DTC Logic ...............................................................72
Diagnosis Procedure ...............................................72
U1010 CONTROL UNIT (CAN) .........................73
Description ........................................................... ...73
DTC Logic ...............................................................73
Diagnosis Procedure ...............................................73
B2578, B2579 FRONT IN-VEHICLE SENSOR ...74
DTC Logic ............................................................ ...74
Diagnosis Procedure ...............................................74
Component Inspection ............................................75
B257B, B257C AMBIENT SENSOR .................77
DTC Logic ............................................................ ...77
Diagnosis Procedure ...............................................77
Component Inspection ............................................78
B2581, B2582 INTAKE SENSOR .....................80
DTC Logic ............................................................ ...80
Diagnosis Procedure ...............................................80
Component Inspection ............................................81
B262A, B262B, B2657, B2658 EXHAUST
GAS/OUTSIDE ODOR DETECTING SENSOR
...
83
DTC Logic ............................................................ ...83
Diagnosis Procedure ...............................................83
Revision: 2010 May2011 QX56

HAC-4
FRONT AUTOMATIC AIR CONDITIONING
SYSTEM .......................................................... .
133
Diagnosis Chart By Symptom .............................. ..133
REAR AUTOMATIC AIR CONDITIONING
SYSTEM .......................................................... .
135
Diagnosis Chart By Symptom .............................. ..135
ACCS (ADVANCE CLIMATE CONTROL
SYSTEM) .........................................................
137
Symptom Table ................................................... ..137
INSUFFICIENT COOLING ...............................138
FRONT AIR CONDITIONER .................................. ..138
FRONT AIR CONDITIONER : Description ............138
FRONT AIR CONDITIONER : Diagnosis Proce-
dure .......................................................................
138
REAR AIR CONDITIONER .................................... ..139
REAR AIR CONDITIONER : Description ...............139
REAR AIR CONDITIONER : Diagnosis Procedure
..
139
INSUFFICIENT HEATING .............................. .140
FRONT AIR CONDITIONER .................................. ..140
FRONT AIR CONDITIONER : Description ............140
FRONT AIR CONDITIONER : Diagnosis Proce-
dure .......................................................................
140
REAR AIR CONDITIONER .................................... ..140
REAR AIR CONDITIONER : Description ...............141
REAR AIR CONDITIONER : Diagnosis Procedure
..
141
COMPRESSOR DOSE DOT OPERATE ........ .142
Description ........................................................... ..142
Diagnosis Procedure .............................................142
REMOVAL AND INSTALLATION ..............144
FRONT A/C CONTROL .................................. .144
Removal and Installation ..................................... ..144
REAR A/C CONTROL .....................................145
Removal and Installation ..................................... ..145
A/C AUTO AMP. ..............................................146
Removal and Installation ..................................... ..146
AMBIENT SENSOR ..........................................147
Removal and Installation ...................................... .147
IN-VEHICLE SENSOR ......................................148
FRONT A/C UNIT ASSEMBLY ...............................148
FRONT A/C UNIT ASSEMBLY : Removal and In-
stallation ............................................................... .
148
REAR A/C UNIT ASSEMBLY .................................148
REAR A/C UNIT ASSEMBLY : Removal and In-
stallation ............................................................... .
148
SUNLOAD SENSOR ........................................149
Removal and Installation ...................................... .149
INTAKE SENSOR .............................................150
Exploded View ..................................................... .150
Removal and Installation .......................................150
EXHAUST GAS/OUTSIDE ODOR SENSOR ...151
Removal and Installation ...................................... .151
DOOR MOTOR .................................................152
Exploded View ..................................................... .152
MODE DOOR MOTOR ........................................... .153
MODE DOOR MOTOR : Removal and Installation .153
AIR MIX DOOR MOTOR ........................................ .153
AIR MIX DOOR MOTOR : Removal and Installa-
tion ....................................................................... .
153
INTAKE DOOR MOTOR ........................................ .153
INTAKE DOOR MOTOR : Removal and Installa-
tion ........................................................................
153
UPPER VENTILATOR DOOR MOTOR ..................154
UPPER VENTILATOR DOOR MOTOR : Removal
and Installation ..................................................... .
154
REAR MODE DOOR MOTOR ................................ .154
REAR MODE DOOR MOTOR : Removal and In-
stallation ................................................................
154
REAR AIR MIX DOOR MOTOR ............................. .154
REAR AIR MIX DOOR MOTOR : Removal and In-
stallation ................................................................
154
IONIZER ............................................................155
Exploded View ..................................................... .155
Removal and Installation .......................................155
Revision: 2010 May2011 QX56

PRECAUTIONSHAC-5
< PRECAUTION > [AUTOMATIC AIR CONDITIONING]
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006275847
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision that would result in air ba g inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Revision: 2010 May2011 QX56

HAC-6
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
FRONT AUTOMATIC AIR CONDITIONING
SYSTEM : Component Parts Location
INFOID:0000000006275848
1. Preset switch 2. Engine coolant temperature sensor
Refer to EC-16, "
Component Parts
Location". 3. IPDM E/R
Refer to PCS-4, "
Component Parts
Location".
4. ECM Refer to EC-16, "
Component Parts
Location"
5. Refrigerant pressure sensor 6. Ambient sensor
7. Magnet clutch 8. AV control unit Refer to AV- 9 , "
Component Parts Lo-
cation". 9. Combination meter
Refer to MWI-6, "
METER SYSTEM :
Component Parts Location".
10. Sunload sensor 11. Front display 12. Upper ventilator door motor
JMIIA0812ZZ
Revision: 2010 May2011 QX56

COMPONENT PARTSHAC-7
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Component Description
INFOID:0000000006275849
13. Aspirator 14. Front air mix door motor (Driver side) 15. Intake sensor
16. Front mode door motor 17. Front air mix door motor (Passenger
side)18. Intake door motor
19. Front blower motor 20. A/C auto amp. 21. Front in-vehicle sensor
A. Left side of heater & cooling unit as- sembly B. Right side of heater & cooling unit as-
sembly C. Back side of blower unit assembly
D. Cluster lid C is removed E. Ins trument lower panel LH is re-
moved
Component Description
Ambient sensor Ambient sensor measures ambient air temperature. The sensor uses a
thermistor which is sensitive to the change in temperature. The electrical
resistance of the thermistor decreases as temperature increases.
AV c o n t r o l u n i t AV control unit transmits front A/C control operation signal to A/C auto amp.
via CAN communication line.
A/C auto amp. A/C auto amp. controls front automatic air conditioning system by inputting
and calculating signals from each sensor and each switch. A/C auto amp.
has self-diagnosis function. Diagnosis of front automatic air conditioning
system can be performed quickly.
Blower unit Front blower motor Refer to
HAC-12
.
Intake door motor The LCU (Local Control Unit) is installed to intake door motor so as to per-
form the multiplex commu
nication control (LIN).
Refer to HAC-18, "
FRONT AUTOMATIC AIR CONDITIONING SYSTEM :
Door Control".
Combination meter Combination meter transmits vehicle speed signal to A/C auto amp. via
CAN communication line.
ECM ECM controls compressor according to status of engine and refrigerant.
ECM transmits engine coolant temperature signal to A/C auto amp. via
CAN communication line.
Engine coolant temperature sensor Engine coolant temperature sensor measures engine coolant temperature.
The sensor uses a thermistor which is sensitive to the change in tempera-
ture. The electrical resistance of the thermistor decreases as temperature
increases.
Front display Front display indicates operation status of front automatic air conditioning
system.
Front in-vehicle sensor Front in-vehicle sensor measures temperature of intake air that flows
through aspirator to passenger room. The sensor uses a thermistor which
is sensitive to the change in temperature. The electrical resistance of the
thermistor decreases as temperature increases.
Revision: 2010 May2011 QX56

HAC-8
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
COMPONENT PARTS
REAR AUTOMATIC AIR CONDITIONING SYSTEM
Heater & cooling unit
assemblyAspirator Refer to
HAC-12
.
Front air mix door motor (Driver
side) The LCU (Local Control Unit) is installe
d to front air mix door motor (driver
side) so as to perform the multiplex communication control (LIN).
Refer to HAC-18, "
FRONT AUTOMATIC AIR CONDITIONING SYSTEM :
Door Control".
Front air mix door motor (Pas-
senger side) The LCU (Local Control Unit) is installed to front air mix door motor (pas-
senger side) so as to perform the multiplex communication control (LIN).
Refer to
HAC-18, "
FRONT AUTOMATIC AIR CONDITIONING SYSTEM :
Door Control".
Front mode door motor The LCU (Local Control Unit) is installed to front mode door motor so as to
perform the multiplex communication control (LIN).
Refer to
HAC-18, "
FRONT AUTOMATIC AIR CONDITIONING SYSTEM :
Door Control".
Intake sensor Intake sensor measures temperature of front evaporator fin temperature.
The sensor uses a thermistor which is sensitive to the change in tempera-
ture. The electrical resistance of the thermistor decreases as temperature
increases.
Upper ventilator door motor The LCU (Local Control Unit) is installed to upper ventilator door motor so
as to perform the multiplex communication control (LIN).
Refer to
HAC-18, "
FRONT AUTOMATIC AIR CONDITIONING SYSTEM :
Door Control".
IPDM E/R A/C relay is integrated in
IPDM E/R. IPDM E/R op erates A/C relay when A/
C compressor request signal is received from ECM via CAN communica-
tion line.
Magnet clutch The magnet clutch is the device that drives the compressor with the signal
from IPDM E/R. Compressor is driven by the magnet clutch which is mag-
netized by electric power supply. IPDM controls magnet clutch by turning
the built in A/C relay to ON
⇔ OFF according to ECM request.
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.
Refrigerant pressure sensor Refer to HAC-13
.
Sunload sensor Sunload sensor measures sunload amount. This sensor is a dual system
so that sunload for driver side and passenger side are measured separate-
ly. This sensor converts sunload amount to voltage signal by photodiode
and transmits to A/C auto amp..
Component Description
Revision: 2010 May2011 QX56

COMPONENT PARTSHAC-9
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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REAR AUTOMATIC AIR CONDITIONING SY STEM : Component Parts Location
INFOID:0000000006275850
1. Rear A/C control 2. Preset switch 3. Engine coolant temperature sensor
Refer to EC-16, "
Component Parts
Location".
4. ECM Refer to EC-16, "
Component Parts
Location". 5. Ambient sensor 6. AV control unit
Refer to AV- 9 , "
Component Parts Lo-
cation".
7. Combination meter Refer to MWI-6, "
METER SYSTEM :
Component Parts Location". 8. Sunload sensor 9. Front display
10. Rear mode door motor 11. Rear air mix door motor 12. Rear in-vehicle sensor
13. Rear blower motor 14. Rear A/C solenoid valve 15. Rear A/C relay
16. Intake sensor 17. A/C auto amp.
A. Right side of rear A/C unit assembly B. Left side of rear A/C unit assembly C. Back side of engine room (RH)
D. Left side of heater & cooling unit as- sembly E. Cluster lid C is removed
JMIIA0813ZZ
Revision: 2010 May2011 QX56