2012 Infiniti M56 Service & Repair Manual Software
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HAC-1
VENTILATION, HEATER & AIR CONDITIONER
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SECTION HAC
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HAC
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CONTENTS
HEATER & AIR CONDITIONING CONTROL SYSTEM
AUTOMATIC AIR CONDITIONING
PRECAUTION .............................................. 6
PRECAUTIONS .................................................. 6
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................. 6
SYSTEM DESCRIPTION ............................. 7
COMPONENT PARTS ....................................... 7
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) .................................................. 7
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Component Parts Location
...... 7
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Component Description ...... 9
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) ........................................ 10
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Component Parts Lo-
cation ...................................................................... 10
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Component Descrip-
tion ......................................................................... 12
FOREST AIR SYSTEM ............................................. 13
FOREST AIR SYSTEM : Component Parts Loca-
tion ......................................................................... 14
FOREST AIR SYSTEM : Component Description .... 15
BLOWER UNIT ......................................................... 16
BLOWER UNIT : Aroma Motor .............................. 16
BLOWER UNIT : Blower Motor .............................. 16
BLOWER UNIT : Intake Door Motor ...................... 16
BLOWER UNIT : Power Transistor ........................ 16
HEATER & COOLING UNIT ASSEMBLY ................ 17
HEATER & COOLING UNIT ASSEMBLY : Air Mix
Door Motor (Driver Side) ........................................17
HEATER & COOLING UNIT ASSEMBLY : Air Mix
Door Motor (Passenger Side) .................................17
HEATER & COOLING UNIT ASSEMBLY : Aspira-
tor ...........................................................................17
HEATER & COOLING UNIT ASSEMBLY : Mode
Door Motor (Driver Side) ........................................17
HEATER & COOLING UNIT ASSEMBLY : Mode
Door Motor (Passenger side) .................................17
HEATER & COOLING UNIT ASSEMBLY : Rear
Mode Door Motor ....................................................18
HEATER & COOLING UNIT ASSEMBLY : Upper
Ventilator Door Motor .............................................18
HEATER & COOLING UNIT ASSEMBLY : Upper
Ventilator Door Motor (Driver Side) ........................18
HEATER & COOLING UNIT ASSEMBLY : Upper
Ventilator Door Motor (Passenger Side) .................18
Refrigerant Pressure Sensor ..................................18
SYSTEM ............................................................ 19
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) ................................................19
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : System Diagram ................19
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : System Description ...........19
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Air Flow Control .................20
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Air Inlet Control ..................21
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Air Outlet Control ...............22
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Compressor Control ..........22
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Door Control ......................22
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Temperature Control .........25
Revision: 2013 September 2012 M
HAC-2
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Intelligent Key Interlock
Function ................................................................. 25
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Fail-safe ............................ 26
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) ........................................ 26
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : System Diagram ....... 26
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : System Description ... 27
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Air Flow Control ........ 28
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Air Inlet Control ......... 29
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Air Outlet Control ...... 29
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Compressor Control ... 30
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Door Control .............. 30
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Temperature Control ... 33
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Intelligent Key Inter-
lock Function ......................................................... 33
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Fail-safe .................... 34
FOREST AIR SYSTEM ............................................ 34
FOREST AIR SYSTEM : System Diagram ............ 35
FOREST AIR SYSTEM : System Description ....... 35
FOREST AIR SYSTEM : Air Flow Control (Inside
Odor Detecting Mechanism) .................................. 36
FOREST AIR SYSTEM : Aroma Diffuser Control ... 36
FOREST AIR SYSTEM : Automatic Defogging
Control ................................................................... 37
FOREST AIR SYSTEM : Automatic Intake Control
(Exhaust Gas / Outside Odor Detecting Mecha-
nism) ...................................................................... 37
FOREST AIR SYSTEM : Breezy Air Control ......... 37
FOREST AIR SYSTEM : Plasmacluster Control ... 38
FOREST AIR SYSTEM : Intelligent Key Interlock
Function ................................................................. 38
OPERATION ..................................................... 39
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) ............................................... 39
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Switch Name and Function
... 39
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Menu Displayed by Press-
ing Each Switch ..................................................... 41
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) ........................................ 41
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Switch Name and
Function ................................................................. 41
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Menu Displayed by
Pressing Each Switch ............................................ 44
FOREST AIR SYSTEM ............................................ 45
FOREST AIR SYSTEM : Switch Name and Func-
tion ......................................................................... 45
FOREST AIR SYSTEM : Menu Displayed by
Pressing Each Switch ............................................ 48
DIAGNOSIS SYSTEM (A/C AUTO AMP.) ....... 50
Description ............................................................. 50
CONSULT Function ............................................... 50
ECU DIAGNOSIS INFORMATION ............. 54
A/C AUTO AMP. ............................................... 54
Reference Value .................................................... 54
Fail-safe ................................................................. 62
DTC Index .............................................................. 62
ECM, IPDM E/R ................................................ 64
List of ECU Reference ........................................... 64
WIRING DIAGRAM .................................... 65
AUTOMATIC AIR CONDITIONING SYSTEM ... 65
Wiring Diagram ...................................................... 65
BASIC INSPECTION .................................. 68
DIAGNOSIS AND REPAIR WORK FLOW ....... 68
Work Flow .............................................................. 68
OPERATION INSPECTION .............................. 71
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) ................................................ 71
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Work Procedure ................ 71
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) ........................................ 73
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Work Procedure ........ 73
FOREST AIR SYSTEM ............................................ 75
FOREST AIR SYSTEM : Work Procedure ............. 75
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT (A/C AUTO AMP.) ................ 78
Description ............................................................. 78
Work Procedure ..................................................... 78
CONFIGURATION (HVAC) .............................. 79
Description ............................................................. 79
Work Procedure ..................................................... 79
SYSTEM SETTING ........................................... 80
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HAC-3
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AUTOMATIC AIR CONDITIONING SYSTEM .......... 80
AUTOMATIC AIR CONDITIONING SYSTEM :
Temperature Setting Trimmer ................................ 80
AUTOMATIC AIR CONDITIONING SYSTEM : In-
let Port Memory Function (REC) ............................ 80
AUTOMATIC AIR CONDITIONING SYSTEM : In-
let Port Memory Function (FRE) ............................ 81
AUTOMATIC AIR CONDITIONING SYSTEM :
Foot Position Setting Trimmer ................................ 81
FOREST AIR SYSTEM ............................................. 81
FOREST AIR SYSTEM : Aroma Fragrance Inten-
sity Setting .............................................................. 81
FOREST AIR SYSTEM : Aroma Fragrance Type
Setting .................................................................... 81
FOREST AIR SYSTEM : Air Flow Control (Inside
Odor Detecting Mechanism) Setting ...................... 82
FOREST AIR SYSTEM : Aroma Diffuser Pres-
ence Setting ........................................................... 82
DTC/CIRCUIT DIAGNOSIS ........................ 83
U1000 CAN COMM CIRCUIT ............................83
Description ............................................................. 83
DTC Logic .............................................................. 83
Diagnosis Procedure .............................................. 83
U1010 CONTROL UNIT (CAN) .........................84
Description ............................................................. 84
DTC Logic .............................................................. 84
Diagnosis Procedure .............................................. 84
B2578, B2579 IN-VEHICLE SENSOR ..............85
DTC Logic .............................................................. 85
Diagnosis Procedure .............................................. 85
Component Inspection ........................................... 86
B257B, B257C AMBIENT SENSOR .................88
DTC Logic .............................................................. 88
Diagnosis Procedure .............................................. 88
Component Inspection ........................................... 89
B2581, B2582 INTAKE SENSOR .....................91
DTC Logic .............................................................. 91
Diagnosis Procedure .............................................. 91
Component Inspection ........................................... 92
B262A, B262B, B2657, B2658 EXHAUST
GAS/OUTSIDE ODOR DETECTING SENSOR
....94
DTC Logic .............................................................. 94
Diagnosis Procedure .............................................. 94
B2630, B2631 SUNLOAD SENSOR .................98
DTC Logic .............................................................. 98
Diagnosis Procedure .............................................. 98
Component Inspection ......................................... 100
B2750, B2751, B2752 AIR MIX DOOR MO-
TOR (DRIVER SIDE) ....................................... 101
DTC Logic ............................................................ 101
Diagnosis Procedure ............................................ 101
Component Inspection (Motor) ............................. 104
Component Inspection (PBR) ............................... 105
B2753, B2754, B2755 AIR MIX DOOR MO-
TOR (PASSENGER SIDE) .............................. 106
DTC Logic ............................................................. 106
Diagnosis Procedure ............................................ 106
Component Inspection (Motor) ............................. 109
Component Inspection (PBR) ............................... 110
B2756, B2757, B2758 MODE DOOR MOTOR
(DRIVER SIDE) ............................................... 111
DTC Logic ............................................................. 111
Diagnosis Procedure ............................................ 111
Component Inspection (Motor) ............................. 114
Component Inspection (PBR) ............................... 115
B2759, B275A, B275B MODE DOOR MOTOR
(PASSENGER SIDE) ...................................... 116
DTC Logic ............................................................. 116
Diagnosis Procedure ............................................ 116
Component Inspection (Motor) ............................. 120
Component Inspection (PBR) ............................... 120
B275C, B275D, B275E INTAKE DOOR MO-
TOR ................................................................. 121
DTC Logic ............................................................. 121
Diagnosis Procedure ............................................ 121
Component Inspection (Motor) ............................. 125
Component Inspection (PBR) ............................... 125
B275F, B2760, B2761 UPPER VENTILATOR
DOOR MOTOR ................................................ 126
DTC Logic ............................................................. 126
Diagnosis Procedure ............................................ 126
Component Inspection (Motor) ............................. 129
Component Inspection (PBR) ............................... 130
B275F, B2760, B2761 UPPER VENTILATOR
DOOR MOTOR (DRIVER SIDE) ..................... 131
DTC Logic ............................................................. 131
Diagnosis Procedure ............................................ 131
Component Inspection (Motor) ............................. 134
Component Inspection (PBR) ............................... 135
B2762, B2763, B2764 REAR MODE DOOR
MOTOR ........................................................... 136
DTC Logic ............................................................. 136
Diagnosis Procedure ............................................ 136
Component Inspection (Motor) ............................. 139
Component Inspection (PBR) ............................... 140
B2765, B2766, B2767 UPPER VENTILATOR
DOOR MOTOR (PASSENGER SIDE) ............ 141
DTC Logic ............................................................. 141
Diagnosis Procedure ............................................ 141
Component Inspection (Motor) ............................. 144
Component Inspection (PBR) ............................... 145
Revision: 2013 September 2012 M
HAC-4
B2768, B2769, B276A AROMA MOTOR ....... 146
DTC Logic ............................................................. 146
Diagnosis Procedure ............................................ 146
Component Inspection (Motor) ............................. 149
Component Inspection (PBR) ............................... 150
B276B, B276C, B276D HUMIDITY SENSOR . 151
DTC Logic ............................................................. 151
Diagnosis Procedure ............................................ 151
Component Inspection .......................................... 154
POWER SUPPLY AND GROUND CIRCUIT .. 156
A/C AUTO AMP. ..................................................... 156
A/C AUTO AMP. : Diagnosis Procedure .............. 156
DOOR MOTOR PBR (WITH FOREST AIR) ............ 156
DOOR MOTOR PBR (WITH FOREST AIR) : Diag-
nosis Procedure .................................................... 156
DOOR MOTOR PBR (WITHOUT FOREST AIR) .... 158
DOOR MOTOR PBR (WITHOUT FOREST AIR) :
Diagnosis Procedure ............................................ 158
BLOWER MOTOR .......................................... 161
Diagnosis Procedure ............................................ 161
Component Inspection (Blower Motor) ................. 165
Component Inspection (Blower Relay) ................. 165
ECV (ELECTRICAL CONTROL VALVE) ....... 166
Diagnosis Procedure ............................................ 166
Component Inspection .......................................... 167
INSIDE ODOR DETECTING SENSOR ........... 168
Component Function Check ................................. 168
Diagnosis Procedure ............................................ 168
Component Inspection .......................................... 170
IONIZER .......................................................... 172
Component Function Check ................................. 172
Diagnosis Procedure ............................................ 172
MAGNET CLUTCH ......................................... 175
Component Function Check ................................. 175
Diagnosis Procedure ............................................ 175
SYMPTOM DIAGNOSIS ........................... 176
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) ...................................... 176
Symptom Table .................................................... 176
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) .............................. 179
Symptom Table .................................................... 179
FOREST AIR SYSTEM ................................... 181
Symptom Table .................................................... 181
COMPRESSOR DOES NOT OPERATE ........ 183
Description ............................................................ 183
Diagnosis Procedure ............................................ 183
INSUFFICIENT COOLING ............................... 185
Description ........................................................... 185
Diagnosis Procedure ............................................ 185
INSUFFICIENT HEATING ............................... 186
Description ........................................................... 186
Diagnosis Procedure ............................................ 186
INTELLIGENT KEY INTERLOCK FUNCTION
DOES NOT OPERATE .................................... 187
Description ........................................................... 187
Diagnosis Procedure ............................................ 187
NORMAL OPERATING CONDITION .............. 188
Description ........................................................... 188
REMOVAL AND INSTALLATION ............. 189
MULTIFUNCTION SWITCH ............................ 189
Removal and Installation ...................................... 189
A/C AUTO AMP. .............................................. 190
Exploded View ..................................................... 190
Removal and Installation ...................................... 190
AMBIENT SENSOR ......................................... 191
Removal and Installation ...................................... 191
IN-VEHICLE SENSOR ..................................... 192
Removal and Installation ...................................... 192
SUNLOAD SENSOR ....................................... 193
Removal and Installation ...................................... 193
HUMIDITY SENSOR ........................................ 194
Exploded View ..................................................... 194
Removal and Installation ...................................... 194
INTAKE SENSOR ............................................ 195
Exploded View ..................................................... 195
Removal and Installation ...................................... 195
INSIDE ODOR DETECTING SENSOR ........... 196
Exploded View ..................................................... 196
Removal and Installation ...................................... 196
EXHAUST GAS/OUTSIDE ODOR SENSOR .. 197
Removal and Installation ...................................... 197
DOOR MOTOR ................................................ 198
Exploded View ..................................................... 198
MODE DOOR MOTOR ........................................... 198
MODE DOOR MOTOR : Removal and Installation . 198
AIR MIX DOOR MOTOR ........................................ 199
AIR MIX DOOR MOTOR : Removal and Installa-
tion ....................................................................... 199
INTAKE DOOR MOTOR ........................................ 199
INTAKE DOOR MOTOR : Removal and Installa-
tion ....................................................................... 199
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HAC-5
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UPPER VENTILATOR DOOR MOTOR .................. 199
UPPER VENTILATOR DOOR MOTOR : Removal
and Installation ..................................................... 199
REAR MODE DOOR MOTOR ................................ 200
REAR MODE DOOR MOTOR : Removal and In-
stallation ............................................................... 200
POWER TRANSISTOR ................................... 201
Exploded View ..................................................... 201
Removal and Installation ...................................... 201
IONIZER .......................................................... 202
Exploded View ...................................................... 202
Removal and Installation ...................................... 202
AROMA UNIT ASSY ....................................... 203
Exploded View ...................................................... 203
AROMA UNIT .......................................................... 203
AROMA UNIT : Removal and Installation ............. 203
AROMA CARTRIDGE ............................................. 203
AROMA CARTRIDGE : Removal and Installation .. 203
Revision: 2013 September 2012 M
HAC-6
< PRECAUTION >
[AUTOMATIC AIR CONDITIONING]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER" INFOID:0000000006885435
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity 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:
Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.
• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-
vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, never 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: 2013 September 2012 M
COMPONENT PARTS
HAC-7
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
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SYSTEM DESCRIPTION
COMPONENT PARTS
AUTOMATIC AIR CONDITIONING SYSTEM (WITH FOREST AIR)
AUTOMATIC AIR CONDITIONING SYSTEM (WITH FOREST AIR) : Component Parts
Revision: 2013 September 2012 M
HAC-8
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
COMPONENT PARTS
Location INFOID:0000000006885436
JMIIA0763ZZ
Revision: 2013 September 2012 M
COMPONENT PARTS
HAC-9
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
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AUTOMATIC AIR CONDITIONING SYSTEM (WITH FOREST AIR) : Component De-
scription INFOID:0000000006885437
1. AV control unit
Refer to AV-127, " Component Parts
Location " .
2. IPDM E/R
Refer to PCS-5, " IPDM E/R : Compo-
nent Parts Location " .
3. ECM
VQ37VHR: Refer to EC-38, " EN-
GINE CONTROL SYSTEM : Com-
ponent Parts Location " .
VK56VD: Refer to EC-990, " EN-
GINE CONTROL SYSTEM : Com-
ponent Parts Location " .
4. Refrigerant pressure sensor 5. Ambient sensor 6. BCM
BCS-4, " BODY CONTROL SYS-
TEM : Component Parts Location " .
7. Combination meter
Refer to MWI-6, " METER SYSTEM :
Component Parts Location " .
8. Multifunction switch 9. Display
10. Sunload sensor 11. ECV (Electrical Control Valve) 12. Magnet clutch
13. Magnet clutch 14. ECV (Electrical Control Valve) 15. In-vehicle sensor
16. Aspirator 17. Intake sensor 18. Air mix door motor (Driver side)
19. Rear mode door motor 20. Mode door motor (Driver side) 21. Upper ventilator door motor (Driver
side)
22. Upper ventilator door motor (Passen-
ger side)
23. Mode door motor (Passenger side) 24. Air mix door motor (Passenger side)
25. Intake door motor 26. Power transistor 27. Blower motor
28. A/C auto amp.
A. Compressor (VQ37VHR) B. Compressor (VK56VD) C. Lower instrument panel LH is re-
moved
D. Left side of heater & cooling unit as-
sembly
E. Right side of heater & cooling unit as-
sembly
F. Rear side of blower unit
G. Instrument lower panel RH is re-
moved
Component parts Description
Blower unit
Blower motor Refer to HAC-16 .
Intake door motor Refer to HAC-16 .
Power transistor Refer to HAC-16 .
Compressor
ECV (Electrical Control Valve)
ECV (electrical control valve) is installed on the compressor and controls it
for emitting appropriate amount of refrigerant when necessary.
Magnet clutch
• 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 magnetized by elec-
tric power supply.
Revision: 2013 September 2012 M
HAC-10
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
COMPONENT PARTS
AUTOMATIC AIR CONDITIONING SYSTEM (WITHOUT FOREST AIR)
AUTOMATIC AIR CONDITIONING SYSTEM (WITHOUT FOREST AIR) : Component
Heater & cooling unit
assembly
Air mix door motor (Driver side) Refer to HAC-17 .
Air mix door motor (Passenger
side)
Refer to HAC-17 .
Aspirator Refer to HAC-17 .
Intake sensor
Intake sensor measures evaporator fin temperature. This sensor uses ther-
mistor that decreases electrical resistance as temperature increases.
Mode door motor (Driver side) Refer to HAC-17 .
Mode door motor (Passenger
side)
Refer to HAC-17 .
Rear mode door motor Refer to HAC-18 .
Upper ventilator door motor
(Driver side)
Refer to HAC-18 .
Upper ventilator door motor
(Passenger side)
Refer to HAC-18 .
Ambient sensor
Ambient sensor measures ambient air temperature. This sensor uses ther-
mistor that decreases electrical resistance as temperature increases.
AV control unit
AV control unit transmits A/C switch operation signal to A/C auto amp. via
CAN communication line.
A/C auto amp.
A/C auto amp. controls air conditioning system by inputting and calculating
signals from each sensor and each switch. A/C auto amp. has self-diagno-
sis function. Diagnosis of air conditioning system can be performed quickly.
BCM BCM transmits key ID signal to A/C auto amp. via CAN communication line.
Display
Display indicates operation status of air conditioning system. Display has
touch panel function that can be used to control air conditioning system.
ECM ECM controls compressor according to status of engine and refrigerant.
Engine coolant temperature sensor
Engine coolant temperature sensor measures engine coolant temperature.
This sensor uses thermistor that decreases electrical resistance as temper-
ature increases.
In-vehicle sensor
In-vehicle sensor measures temperature of intake air through aspirator to
passenger room. This sensor uses thermistor that decreases electrical re-
sistance as temperature increases.
IPDM E/R
A/C relay is integrated in IPDM E/R. IPDM E/R operates A/C relay when A/
C compressor request signal is received from ECM via CAN communica-
tion line.
Multifunction switch
Multifunction switch integrates A/C controller and AV operation switch. A/C
switch operation signal is transmitted from multifunction switch to AV con-
trol unit via communication line.
Refrigerant pressure sensor Refer to HAC-18 .
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 parts Description
Revision: 2013 September 2012 M
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If you are in need of a repair manual for your 2012 Infiniti M56, look no further. Our accessible repair manual software is the perfect solution for both professional mechanics and DIY enthusiasts. In the past, traditional service manuals in book format were costly and inconvenient. Our repair manual software provides the same valuable information in a more affordable and convenient digital format.
Whether you are looking to fix the brakes, replace suspension components, address engine issues, or perform standard maintenance, this repair manual software has you covered. It includes comprehensive service information for the brakes, engine, suspension, steering, drivetrain, electrical systems, heating, air conditioning, and more.
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