2011 Infiniti M37 Service & Repair Manual
What's Included?
Lifetime Access
Fast Download Speeds
Offline Viewing
Access Contents & Bookmarks
Full Search Facility
Print one or all pages of your manual
HAC-1
VENTILATION, HEATER & AIR CONDITIONER
C
D
E
F
G
H
J
K
L
M
SECTION HAC
A
B
HAC
N
O
P
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: 2010 June 2011 M37/M56
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 (HVAC) ......................... 50
Description ............................................................. 50
CONSULT-III 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 .................................. 80
DIAGNOSIS AND REPAIR WORK FLOW ....... 80
Work Flow .............................................................. 80
OPERATION INSPECTION .............................. 82
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) ................................................ 82
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) : Work Procedure ................ 82
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) ........................................ 84
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) : Work Procedure ........ 84
FOREST AIR SYSTEM ............................................ 86
FOREST AIR SYSTEM : Work Procedure ............. 86
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT (A/C AUTO AMP.) ................ 89
Description ............................................................. 89
Work Procedure ..................................................... 89
CONFIGURATION (HVAC) .............................. 90
Description ............................................................. 90
Work Procedure ..................................................... 90
SYSTEM SETTING ........................................... 91
Revision: 2010 June 2011 M37/M56
HAC-3
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
AUTOMATIC AIR CONDITIONING SYSTEM .......... 91
AUTOMATIC AIR CONDITIONING SYSTEM :
Temperature Setting Trimmer ................................ 91
AUTOMATIC AIR CONDITIONING SYSTEM : In-
let Port Memory Function (REC) ............................ 91
AUTOMATIC AIR CONDITIONING SYSTEM : In-
let Port Memory Function (FRE) ............................ 92
AUTOMATIC AIR CONDITIONING SYSTEM :
Foot Position Setting Trimmer ................................ 92
FOREST AIR SYSTEM ............................................. 92
FOREST AIR SYSTEM : Aroma Fragrance Inten-
sity Setting .............................................................. 92
FOREST AIR SYSTEM : Aroma Fragrance Type
Setting .................................................................... 92
FOREST AIR SYSTEM : Air Flow Control (Inside
Odor Detecting Mechanism) Setting ...................... 93
FOREST AIR SYSTEM : Aroma Diffuser Pres-
ence Setting ........................................................... 93
DTC/CIRCUIT DIAGNOSIS ........................ 94
U1000 CAN COMM CIRCUIT ............................94
Description ............................................................. 94
DTC Logic .............................................................. 94
Diagnosis Procedure .............................................. 94
U1010 CONTROL UNIT (CAN) .........................95
Description ............................................................. 95
DTC Logic .............................................................. 95
Diagnosis Procedure .............................................. 95
B2578, B2579 IN-VEHICLE SENSOR ..............96
DTC Logic .............................................................. 96
Diagnosis Procedure .............................................. 96
Component Inspection ........................................... 97
B257B, B257C AMBIENT SENSOR .................99
DTC Logic .............................................................. 99
Diagnosis Procedure .............................................. 99
Component Inspection ......................................... 100
B2581, B2582 INTAKE SENSOR ................... 102
DTC Logic ............................................................ 102
Diagnosis Procedure ............................................ 102
Component Inspection ......................................... 103
B262A, B262B, B2657, B2658 EXHAUST
GAS/OUTSIDE ODOR DETECTING SENSOR
.. 105
DTC Logic ............................................................ 105
Diagnosis Procedure ............................................ 105
B2630, B2631 SUNLOAD SENSOR ............... 109
DTC Logic ............................................................ 109
Diagnosis Procedure ............................................ 109
Component Inspection ......................................... 111
B2750, B2751, B2752 AIR MIX DOOR MO-
TOR (DRIVER SIDE) ....................................... 112
DTC Logic ............................................................ 112
Diagnosis Procedure ............................................ 112
Component Inspection (Motor) ............................. 115
Component Inspection (PBR) ............................... 116
B2753, B2754, B2755 AIR MIX DOOR MO-
TOR (PASSENGER SIDE) .............................. 117
DTC Logic ............................................................. 117
Diagnosis Procedure ............................................ 117
Component Inspection (Motor) ............................. 120
Component Inspection (PBR) ............................... 121
B2756, B2757, B2758 MODE DOOR MOTOR
(DRIVER SIDE) ............................................... 122
DTC Logic ............................................................. 122
Diagnosis Procedure ............................................ 122
Component Inspection (Motor) ............................. 125
Component Inspection (PBR) ............................... 126
B2759, B275A, B275B MODE DOOR MOTOR
(PASSENGER SIDE) ...................................... 127
DTC Logic ............................................................. 127
Diagnosis Procedure ............................................ 127
Component Inspection (Motor) ............................. 131
Component Inspection (PBR) ............................... 131
B275C, B275D, B275E INTAKE DOOR MO-
TOR ................................................................. 132
DTC Logic ............................................................. 132
Diagnosis Procedure ............................................ 132
Component Inspection (Motor) ............................. 136
Component Inspection (PBR) ............................... 136
B275F, B2760, B2761 UPPER VENTILATOR
DOOR MOTOR ................................................ 137
DTC Logic ............................................................. 137
Diagnosis Procedure ............................................ 137
Component Inspection (Motor) ............................. 140
Component Inspection (PBR) ............................... 141
B275F, B2760, B2761 UPPER VENTILATOR
DOOR MOTOR (DRIVER SIDE) ..................... 142
DTC Logic ............................................................. 142
Diagnosis Procedure ............................................ 142
Component Inspection (Motor) ............................. 145
Component Inspection (PBR) ............................... 146
B2762, B2763, B2764 REAR MODE DOOR
MOTOR ........................................................... 147
DTC Logic ............................................................. 147
Diagnosis Procedure ............................................ 147
Component Inspection (Motor) ............................. 150
Component Inspection (PBR) ............................... 151
B2765, B2766, B2767 UPPER VENTILATOR
DOOR MOTOR (PASSENGER SIDE) ............ 152
DTC Logic ............................................................. 152
Diagnosis Procedure ............................................ 152
Component Inspection (Motor) ............................. 155
Component Inspection (PBR) ............................... 156
Revision: 2010 June 2011 M37/M56
HAC-4
B2768, B2769, B276A AROMA MOTOR ....... 157
DTC Logic ............................................................. 157
Diagnosis Procedure ............................................ 157
Component Inspection (Motor) ............................. 160
Component Inspection (PBR) ............................... 161
B276B, B276C, B276D HUMIDITY SENSOR . 162
DTC Logic ............................................................. 162
Diagnosis Procedure ............................................ 162
Component Inspection .......................................... 165
POWER SUPPLY AND GROUND CIRCUIT .. 167
A/C AUTO AMP. ..................................................... 167
A/C AUTO AMP. : Diagnosis Procedure .............. 167
DOOR MOTOR PBR (WITH FOREST AIR) ............ 167
DOOR MOTOR PBR (WITH FOREST AIR) : Diag-
nosis Procedure .................................................... 167
DOOR MOTOR PBR (WITHOUT FOREST AIR) .... 169
DOOR MOTOR PBR (WITHOUT FOREST AIR) :
Diagnosis Procedure ............................................ 169
BLOWER MOTOR .......................................... 172
Diagnosis Procedure ............................................ 172
Component Inspection (Blower Motor) ................. 176
Component Inspection (Blower Relay) ................. 176
ECV (ELECTRICAL CONTROL VALVE) ....... 177
Diagnosis Procedure ............................................ 177
Component Inspection .......................................... 178
INSIDE ODOR DETECTING SENSOR ........... 179
Component Function Check ................................. 179
Diagnosis Procedure ............................................ 179
Component Inspection .......................................... 181
IONIZER .......................................................... 183
Component Function Check ................................. 183
Diagnosis Procedure ............................................ 183
MAGNET CLUTCH ......................................... 186
Component Function Check ................................. 186
Diagnosis Procedure ............................................ 186
SYMPTOM DIAGNOSIS ........................... 187
AUTOMATIC AIR CONDITIONING SYSTEM
(WITH FOREST AIR) ...................................... 187
Symptom Table .................................................... 187
AUTOMATIC AIR CONDITIONING SYSTEM
(WITHOUT FOREST AIR) .............................. 190
Symptom Table .................................................... 190
FOREST AIR SYSTEM ................................... 192
Symptom Table .................................................... 192
COMPRESSOR DOSE DOT OPERATE ........ 194
Description ............................................................ 194
Diagnosis Procedure ............................................ 194
INSUFFICIENT COOLING ............................... 196
Description ........................................................... 196
Diagnosis Procedure ............................................ 196
INSUFFICIENT HEATING ............................... 197
Description ........................................................... 197
Diagnosis Procedure ............................................ 197
INTELLIGENT KEY INTERLOCK FUNCTION
DOES NOT OPERATE .................................... 198
Description ........................................................... 198
Diagnosis Procedure ............................................ 198
NORMAL OPERATING CONDITION .............. 199
Description ........................................................... 199
REMOVAL AND INSTALLATION ............. 200
MULTIFUNCTION SWITCH ............................ 200
Removal and Installation ...................................... 200
A/C AUTO AMP. .............................................. 201
Exploded View ..................................................... 201
Removal and Installation ...................................... 201
AMBIENT SENSOR ......................................... 202
Removal and Installation ...................................... 202
IN-VEHICLE SENSOR ..................................... 203
Removal and Installation ...................................... 203
SUNLOAD SENSOR ....................................... 204
Removal and Installation ...................................... 204
HUMIDITY SENSOR ........................................ 205
Exploded View ..................................................... 205
Removal and Installation ...................................... 205
INTAKE SENSOR ............................................ 206
Exploded View ..................................................... 206
Removal and Installation ...................................... 206
INSIDE ODOR DETECTING SENSOR ........... 207
Exploded View ..................................................... 207
Removal and Installation ...................................... 207
EXHAUST GAS/OUTSIDE ODOR SENSOR .. 208
Removal and Installation ...................................... 208
DOOR MOTOR ................................................ 209
Exploded View ..................................................... 209
MODE DOOR MOTOR ........................................... 209
MODE DOOR MOTOR : Removal and Installation . 209
AIR MIX DOOR MOTOR ........................................ 210
AIR MIX DOOR MOTOR : Removal and Installa-
tion ....................................................................... 210
INTAKE DOOR MOTOR ........................................ 210
INTAKE DOOR MOTOR : Removal and Installa-
tion ....................................................................... 210
Revision: 2010 June 2011 M37/M56
HAC-5
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
UPPER VENTILATOR DOOR MOTOR .................. 211
UPPER VENTILATOR DOOR MOTOR : Removal
and Installation ..................................................... 211
REAR MODE DOOR MOTOR ................................ 211
REAR MODE DOOR MOTOR : Removal and In-
stallation ............................................................... 211
POWER TRANSISTOR ................................... 212
Exploded View ..................................................... 212
Removal and Installation ...................................... 212
IONIZER .......................................................... 213
Exploded View ...................................................... 213
Removal and Installation ...................................... 213
AROMA UNIT ASSY ....................................... 214
Exploded View ...................................................... 214
Removal and Installation ...................................... 214
Revision: 2010 June 2011 M37/M56
HAC-6
< PRECAUTION >
[AUTOMATIC AIR CONDITIONING]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER" INFOID:0000000005905830
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:
• 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 the “SRS AIR BAG”.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified 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 June 2011 M37/M56
COMPONENT PARTS
HAC-7
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
SYSTEM DESCRIPTION
COMPONENT PARTS
AUTOMATIC AIR CONDITIONING SYSTEM (WITH FOREST AIR)
AUTOMATIC AIR CONDITIONING SYSTEM (WITH FOREST AIR) : Component Parts
Revision: 2010 June 2011 M37/M56
HAC-8
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
COMPONENT PARTS
Location INFOID:0000000005905635
JMIIA0763ZZ
Revision: 2010 June 2011 M37/M56
COMPONENT PARTS
HAC-9
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
AUTOMATIC AIR CONDITIONING SYSTEM (WITH FOREST AIR) : Component De-
scription INFOID:0000000005905636
1. AV control unit
Refer to AV-144, " Component Parts
Location " .
2. IPDM E/R
Refer to PCS-5, " IPDM E/R : Compo-
nent Parts Location " .
3. ECM
VQ37VHR: Refer to EC-24, " EN-
GINE CONTROL SYSTEM : Com-
ponent Parts Location " .
VK56VD: Refer to EC-548, " 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: 2010 June 2011 M37/M56
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: 2010 June 2011 M37/M56
You're Reading a Preview
What's Included?
Lifetime Access
Fast Download Speeds
Offline Viewing
Access Contents & Bookmarks
Full Search Facility
Print one or all pages of your manual
$36.99
Viewed 16 Times Today
Secure transaction
What's Included?
Lifetime Access
Fast Download Speeds
Offline Viewing
Access Contents & Bookmarks
Full Search Facility
Print one or all pages of your manual
$36.99
If you are in need of a repair manual for your 2011 Infiniti M37, look no further. Our accessible repair manual is perfect for both professional mechanics and DIY enthusiasts. In the past, traditional service manuals in book format were costly and inconvenient. Our repair manual provides the same information at a much lower cost and in a more convenient format.
Whether you need to fix the brakes, replace suspension components, get the engine running, or perform standard maintenance, this repair manual for the Infiniti M37 has you covered. It includes comprehensive service information for the brakes, engine, suspension, steering, drivetrain, electrical systems, heating, air conditioning, and more.
By utilizing this 2011 Infiniti M37 repair manual , you can save a significant amount of money on vehicle repairs. Mechanics often charge high fees for their services, making a DIY approach a cost-effective alternative. The manual is compatible with Windows, Mac computers, smartphones, and tablets, ensuring ease of use for all users.
