Murano Cross Cabriolet Z51 (2013 year). Manual - part 45

GW-34

< REMOVAL AND INSTALLATION >

DOOR REGULATOR

3.

Reinstall door glass while fitting the corner piece assembly to the protective tape as shown in the figure
above.

Fitting between door glass and quarter window glass

1.

Fully close door glass and quarter window glass.

2.

Check that both upper edges of door glass and quarter window glass are at the same level.

3.

Check that the distance between door glass and quarter window glass sash is 8.5 mm (0.335 in).

Inclination Adjustment

• Check that door glass is fitted securely into the sash groove.
• Lower the glass slightly [approximately 10 to 20 mm (0.394 to 0.787 in)] and check that the clearance to the

body side weather-strip is parallel. Loosen the regulator mounting bolts, guide rail mounting bolts, and glass
and guide rail mounting bolts to correct the glass position if the clearance between door glass and body side
weather-strip is not parallel.

• Raise door glass fully and adjust door glass top end and body side weather-strip with adjusting bolt (B), (C),

or (D) as shown in the figure above.

• Always start at adjusting with bolt (B). If the desired angle is not achieved, then proceed to adjusting bolt (C)

and (D) respectively.

• Turn the adjusting bolt clockwise to move the door glass upper end outward.
• Turn the adjusting bolt counterclockwise to move the door glass upper end inward.
• Adjustment process with adjusting bolt (C) is the inverse of adjusting bolt (B) and (D).
• When adjusting with adjusting bolt (D), turn the adjusting bolt clockwise to move the door glass upper end

inward, then counterclockwise to move the door glass upper end outward.

JMKIA8598ZZ

1.

Door glass assembly

2.

Quarter window glass sash

3.

Quarter window glass

B

: 8.5 (0.335)

Unit: mm (in)

JMKIA8396ZZ

Revision: 2012 October

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HAC-1

VENTILATION, HEATER & AIR CONDITIONER

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CONTENTS

HEATER & AIR CONDITIONING CONTROL SYSTEM

AUTOMATIC AIR CONDITIONING

PRECAUTION ...............................................

4

PRECAUTIONS ...................................................

4

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................

4

Precaution for Battery Service  ..................................

4

Service Procedure Precautions for Models with a 
Pop-up Roll Bar .........................................................

4

SYSTEM DESCRIPTION  ..............................

5

COMPONENT PARTS  ........................................

5

Component Parts Location ........................................

5

Component Description .............................................

7

BLOWER UNIT ASSEMBLY  .......................................

7

BLOWER UNIT ASSEMBLY : Intake Door Motor ......

7

BLOWER UNIT ASSEMBLY : Blower Motor .............

8

HEATER & COOLING UNIT ASSEMBLY ...................

8

HEATER & COOLING UNIT ASSEMBLY : Aspira-
tor ..............................................................................

8

HEATER & COOLING UNIT ASSEMBLY : Intake 
Sensor .......................................................................

8

HEATER & COOLING UNIT ASSEMBLY : Air Mix 
Door Motor (Driver side) ............................................

8

HEATER & COOLING UNIT ASSEMBLY : Air Mix 
Door Motor (Passenger side)  ....................................

9

HEATER & COOLING UNIT ASSEMBLY : Mode 
Door Motor  ................................................................

9

HEATER & COOLING UNIT ASSEMBLY : Upper 
Ventilator Door Motor  ................................................

9

A/C Auto Amp.  ..........................................................

9

Ambient Sensor .........................................................

9

In-vehicle Sensor  ......................................................

9

Sunload Sensor .........................................................

9

Refrigerant Pressure Sensor .....................................

9

Magnet Clutch  .........................................................

10

SYSTEM ............................................................

11

System Diagram  ......................................................

11

System Description ..................................................

11

Temperature Control  ...............................................

12

Air Outlet Control  .....................................................

13

Air Flow Control  .......................................................

13

Air Inlet Control ........................................................

14

Compressor Control  ................................................

14

Door Control  ............................................................

15

Fail-safe ...................................................................

16

OPERATION .....................................................

18

Switch Name and Function ......................................

18

DIAGNOSIS SYSTEM (A/C AUTO AMP.)  ........

21

Description ...............................................................

21

CONSULT Function .................................................

21

ECU DIAGNOSIS INFORMATION ..............

24

A/C AUTO AMP.  ...............................................

24

Reference Value ......................................................

24

Fail-safe ...................................................................

25

DTC Index  ...............................................................

26

ECM, IPDM E/R .................................................

27

List of ECU Reference .............................................

27

WIRING DIAGRAM  ......................................

28

AUTOMATIC AIR CONDITIONING SYSTEM ...

28

Wiring Diagram ........................................................

28

BASIC INSPECTION  ...................................

30

DIAGNOSIS AND REPAIR WORK FLOW  .......

30

Work Flow ................................................................

30

OPERATION INSPECTION  ..............................

33

Work Procedure .......................................................

33

SYSTEM SETTING ...........................................

35

Temperature Setting Trimmer  .................................

35

Revision: 2012 October

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HAC-2

Inlet Port Memory Function (REC)  .........................

35

Inlet Port Memory Function (FRE)  ..........................

36

Foot Position Setting Trimmer  ................................

36

DTC/CIRCUIT DIAGNOSIS .........................

37

U1000 CAN COMM CIRCUIT  ............................

37

Description ..............................................................

37

DTC Logic ...............................................................

37

Diagnosis Procedure  ..............................................

37

U1010 CONTROL UNIT (CAN)  .........................

38

Description ..............................................................

38

DTC Logic ...............................................................

38

Diagnosis Procedure  ..............................................

38

B2578, B2579 IN-VEHICLE SENSOR ...............

39

DTC Logic ...............................................................

39

Diagnosis Procedure  ..............................................

39

Component Inspection ............................................

40

B257B, B257C AMBIENT SENSOR  .................

41

DTC Logic ...............................................................

41

Diagnosis Procedure  ..............................................

41

Component Inspection ............................................

42

B2581, B2582 INTAKE SENSOR ......................

43

DTC Logic ...............................................................

43

Diagnosis Procedure  ..............................................

43

Component Inspection ............................................

44

B2630, B2631 SUNLOAD SENSOR  .................

45

DTC Logic ...............................................................

45

Diagnosis Procedure  ..............................................

45

Component Inspection ............................................

46

B2632, B2633 AIR MIX DOOR MOTOR 
(DRIVER SIDE)  ..................................................

48

DTC Logic ...............................................................

48

Diagnosis Procedure  ..............................................

48

B2634, B2635 AIR MIX DOOR MOTOR (PAS-
SENGER SIDE) ..................................................

51

DTC Logic ...............................................................

51

Diagnosis Procedure  ..............................................

51

B2636, B2637, B2638, B2639, B2654, B2655 
MODE DOOR MOTOR  ......................................

54

DTC Logic ...............................................................

54

Diagnosis Procedure  ..............................................

54

B263D, B263E, B263F INTAKE DOOR MO-
TOR ....................................................................

57

DTC Logic ...............................................................

57

Diagnosis Procedure  ..............................................

57

B2661, B2662, B2663 UPPER VENTILATOR 
DOOR MOTOR  ..................................................

60

DTC Logic ...............................................................

60

Diagnosis Procedure  ..............................................

60

POWER SUPPLY AND GROUND CIRCUIT  .....

63

A/C AUTO AMP. ........................................................

63

A/C AUTO AMP. : Diagnosis Procedure  .................

63

DOOR MOTOR  ..................................................

65

Diagnosis Procedure ...............................................

65

BLOWER MOTOR .............................................

68

Diagnosis Procedure ...............................................

68

Component Inspection (Blower Motor)  ...................

69

Component Inspection (Blower Relay)  ...................

70

MAGNET CLUTCH  ............................................

71

Component Function Check  ...................................

71

Diagnosis Procedure ...............................................

71

SYMPTOM DIAGNOSIS  ............................

72

AUTOMATIC AIR CONDITIONING SYSTEM ...

72

Symptom Table .......................................................

72

INSUFFICIENT COOLING .................................

74

Description ..............................................................

74

Diagnosis Procedure ...............................................

74

INSUFFICIENT HEATING  .................................

76

Description ..............................................................

76

Diagnosis Procedure ...............................................

76

COMPRESSOR DOES NOT OPERATE  ...........

77

Description ..............................................................

77

Diagnosis Procedure ...............................................

77

REMOVAL AND INSTALLATION ..............

78

PRESET SWITCH ..............................................

78

Exploded View  ........................................................

78

Removal and Installation .........................................

78

A/C AUTO AMP. ................................................

79

Exploded View  ........................................................

79

Removal and Installation .........................................

79

AMBIENT SENSOR ...........................................

80

Exploded View  ........................................................

80

Removal and Installation .........................................

80

IN-VEHICLE SENSOR .......................................

81

Exploded View  ........................................................

81

Removal and Installation .........................................

81

SUNLOAD SENSOR  .........................................

82

Exploded View  ........................................................

82

Removal and Installation .........................................

82

INTAKE SENSOR ..............................................

83

Exploded View  ........................................................

83

Removal and Installation .........................................

83

REFRIGERANT PRESSURE SENSOR  ............

85

Exploded View  ........................................................

85

Removal and Installation .........................................

85

Revision: 2012 October

2013 Murano CrossCabriolet

HAC-3

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DOOR MOTOR  ...................................................

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Exploded View  ........................................................

86

AIR MIX DOOR MOTOR  ...........................................

86

AIR MIX DOOR MOTOR : Removal and Installa-
tion ..........................................................................

86

MODE DOOR MOTOR  ..............................................

87

MODE DOOR MOTOR : Removal and Installation 

....

87

INTAKE DOOR MOTOR  ............................................

87

INTAKE DOOR MOTOR : Removal and Installa-
tion ...........................................................................

88

UPPER VENTILATOR DOOR MOTOR  .....................

88

UPPER VENTILATOR DOOR MOTOR : Removal 
and Installation  ........................................................

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Revision: 2012 October

2013 Murano CrossCabriolet

HAC-4

< PRECAUTION >

[AUTOMATIC AIR CONDITIONING]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

INFOID:0000000008460609

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.

Precaution for Battery Service

INFOID:0000000008460610

Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.

Service Procedure Precautions for Models with a Pop-up Roll Bar

INFOID:0000000008460611

WARNING:

Always observe the following items for preventing accidental activation.
• Risk of passenger injury or death may increase if the pop-up roll bar does not deploy during a roll

over collision. In order to reduce the chance of an incident where the pop-up roll bar is inoperative,
all maintenance must be performed by a NISSAN or INFINITI dealer.

• Before removing and installing the pop-up roll bar component parts and harness, always turn the

ignition switch OFF, disconnect the battery negative terminal, and wait for 3 minutes or more. (The
purpose of this operation is to discharge electricity that is accumulated in the auxiliary power supply
circuit in the air bag diagnosis sensor unit.)

• When repairing, removing, and installing a pop-up roll bar, always refer to SRS AIR BAG and SRS

AIR BAG CONTROL warnings in the Service Manual.

Revision: 2012 October

2013 Murano CrossCabriolet

COMPONENT PARTS

HAC-5

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000008460612

ENGINE COMPARTMENT

JPIIA0607ZZ

Revision: 2012 October

2013 Murano CrossCabriolet

HAC-6

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

PASSENGER COMPARTMENT

1.

Refrigerant pressure sensor

2.

Compressor (magnet clutch)

3.

Ambient sensor

1.

Intake door motor

2.

Upper ventilator door motor

3.

Air mix door motor (passenger side)

4.

Air mix door motor (driver side)

5.

Mode door motor

6.

Sunload sensor

JPIIA0608ZZ

Revision: 2012 October

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COMPONENT PARTS

HAC-7

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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Component Description

INFOID:0000000008460613

BLOWER UNIT ASSEMBLY

BLOWER UNIT ASSEMBLY : Intake Door Motor

INFOID:0000000008460614

• Intake door motor consists of motor that drives door, PBR (Potentio Balance Register) that detects door

position and LCU (Local Control Unit) that performs multiplex communication control (LAN) with A/C auto
amp. Refer to 

HAC-15, "Door Control"

.

7.

In-vehicle sensor

8.

A/C auto amp.

9.

Intake sensor

10. Blower motor

Component

Description

Blower unit assembly

Intake door motor

HAC-7, "BLOWER UNIT ASSEMBLY : Intake Door Motor"

Blower motor

HAC-8, "BLOWER UNIT ASSEMBLY : Blower Motor"

Heater & cooling unit 
assembly

Aspirator

HAC-8, "HEATER & COOLING UNIT ASSEMBLY : Aspirator"

Intake sensor

HAC-8, "HEATER & COOLING UNIT ASSEMBLY : Intake Sensor"

Air mix door motor 
(driver side)

HAC-8, "HEATER & COOLING UNIT ASSEMBLY : Air Mix Door Motor (Driver side)"

Air mix door motor 
(passenger side)

HAC-9, "HEATER & COOLING UNIT ASSEMBLY : Air Mix Door Motor (Passenger 
side)"

Mode door motor

HAC-9, "HEATER & COOLING UNIT ASSEMBLY : Mode Door Motor"

Upper ventilator 
door motor

HAC-9, "HEATER & COOLING UNIT ASSEMBLY : Upper Ventilator Door Motor"

Preset switch

Preset switch is integrated with A/C controller and AV operation switch. A/C switch op-
eration signal is transmitted from preset switch to AV control unit via communication 
line.
Refer to 

AV-10, "Component Parts Location"

 (BOSE audio without navigation) or 

AV-

126, "Component Parts Location"

 (BOSE audio with navigation) for detailed installation 

location.

Display unit

Display unit indicates operation status of air conditioning.
Refer to 

AV-10, "Component Parts Location"

 (BOSE audio without navigation) or 

AV-

126, "Component Parts Location"

 (BOSE audio with navigation) for detailed installation 

location.

AV control unit

AV control unit transmits A/C switch operation signal to A/C auto amp. via CAN com-
munication line.
Refer to 

AV-10, "Component Parts Location"

 (BOSE audio without navigation) or 

AV-

126, "Component Parts Location"

 (BOSE audio with navigation) for detailed installation 

location.

A/C auto amp.

HAC-9, "A/C Auto Amp."

ECM

ECM, when receiving A/C ON signal and blower fan ON signal from A/C auto amp., 
transmits A/C compressor request signal to IPDM E/R via CAN communication ac-
cording to status of the engine and refrigerant pressure.
ECM transmits engine coolant temperature signal to A/C auto amp. via CAN commu-
nication line.
Refer to 

EC-15, "ENGINE CONTROL SYSTEM : Component Parts Location"

 for de-

tailed installation location.

IPDM E/R

A/C relay is integrated in IPDM E/R. IPDM E/R operates A/C relay when receiving A/
C compressor request signal from ECM via CAN communication line.
Refer to 

PCS-4, "Component Parts Location"

 for detailed installation location.

Ambient sensor

HAC-9, "Ambient Sensor"

In-vehicle sensor

HAC-9, "In-vehicle Sensor"

Sunload sensor

HAC-9, "Sunload Sensor"

Refrigerant pressure sensor

HAC-9, "Refrigerant Pressure Sensor"

Magnet clutch

HAC-10, "Magnet Clutch"

Revision: 2012 October

2013 Murano CrossCabriolet

HAC-8

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

• Rotation of motor is transmitted to intake door, then air inlet is switched.

BLOWER UNIT ASSEMBLY : Blower Motor

INFOID:0000000008460615

• The blower motor utilizes a brush-less motor with a rotating mag-

net. Quietness is improved over previous motors that rotates coil
while brush functions as contact points.

• Rotation speed is changed according to blower motor control sig-

nal (duty ratio) from A/C auto amp.

HEATER & COOLING UNIT ASSEMBLY

HEATER & COOLING UNIT ASSEMBLY : Aspirator

INFOID:0000000008460616

The aspirator generates the vacuum by the air blown from the heater
& cooling unit case and draws the air of the passenger room to the
in-vehicle sensor area via the aspirator duct.

HEATER & COOLING UNIT ASSEMBLY : Intake Sensor

INFOID:0000000008460617

Intake sensor measures evaporator fin temperature. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

HEATER & COOLING UNIT ASSEMBLY : Air Mix Door Motor (Driver side)

INFOID:0000000008460618

• Air mix door motor (driver side) consists of motor that drives door, PBR (Potentio Balance Register) that

detects door position and LCU (Local Control Unit) that performs multiplex communication control (LAN) with
A/C auto amp. Refer to 

HAC-15, "Door Control"

.

• Rotation of motor is transmitted to air mix door (driver side), then air flow temperature (driver side) is

switched.

RJIA2467J

ZHA152H

RJIA1804E

Revision: 2012 October

2013 Murano CrossCabriolet

COMPONENT PARTS

HAC-9

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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HEATER & COOLING UNIT ASSEMBLY : Air Mix Door Motor (Passenger side)

INFOID:0000000008460619

• Air mix door motor (passenger side) consists of motor that drives door, PBR (Potentio Balance Register) that

detects door position and LCU (Local Control Unit) that performs multiplex communication control (LAN) with
A/C auto amp. Refer to 

HAC-15, "Door Control"

.

• Rotation of motor is transmitted to air mix door (passenger side), then air flow temperature (passenger side)

is switched.

HEATER & COOLING UNIT ASSEMBLY : Mode Door Motor

INFOID:0000000008460620

• Mode door motor consists of motor that drives door, PBR (Potentio Balance Register) that detects door posi-

tion and LCU (Local Control Unit) that performs multiplex communication control (LAN) with A/C auto amp.
Refer to 

HAC-15, "Door Control"

.

• Rotation of motor is transmitted to mode door (ventilator door, max. cool door, defroster door and foot door)

by lever, link, and rod, then air outlet is switched.

HEATER & COOLING UNIT ASSEMBLY : Upper Ventilator Door Motor

INFOID:0000000008460621

• Upper ventilator door motor consists of motor that drives door, PBR (Potentio Balance Register) that detects

door position and LCU (Local Control Unit) that performs multiplex communication control (LAN) with A/C
auto amp. Refer to 

HAC-15, "Door Control"

.

• Rotation of motor is transmitted to upper ventilator door by lod and lever, then air outlet (upper ventilator) is

switched.

A/C Auto Amp.

INFOID:0000000008460622

A/C auto amp. controls automatic air conditioning system, by receiving and calculating signal from each sen-
sor and switch. A/C auto amp. has self-diagnosis function. Diagnosis of air conditioning system can be per-
formed quickly.

Ambient Sensor

INFOID:0000000008460623

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.

In-vehicle Sensor

INFOID:0000000008460624

In-vehicle sensor measures temperature of intake air that flows through aspirator to passenger room. The sen-
sor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

Sunload Sensor

INFOID:0000000008460625

Sunload sensor measures sunload amount. This sensor converts sunload amount to voltage signal by photo-
diode and transmits it to A/C auto amp.

Refrigerant Pressure Sensor

INFOID:0000000008460626

DESCRIPTION

• The refrigerant pressure sensor converts high-pressure side refrigerant pressure into voltage and transmits

it to ECM.

• ECM operates cooler cycle protection and cooling fan speed control according to voltage value that is input.

PBIB2657E

Revision: 2012 October

2013 Murano CrossCabriolet

HAC-10

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

STRUCTURE AND OPERATION

• The refrigerant pressure sensor is a capacitance type sensor. It consists of a pressure detection area and a

signal processing area.

• The pressure detection area, which is a variable capacity condenser, changes internal static capacitance

according to pressure force.

• The signal processing area detects the static capacitance of the pressure detection area, converts the static

capacitance into a voltage value, and transmits the voltage value to ECM.

Magnet Clutch

INFOID:0000000008460627

DESCRIPTION

Compressor is driven by the magnet clutch which is magnetized by electric power supply.

STRUCTURE AND OPERATION

• Magnet clutch consists of pulley, clutch disc, and field coil.
- Pulley is connected with crankshaft pulley of engine via drive belt

and is always rotated while engine is running.

- Clutch disc is connected with drive shaft of compressor.
- Field coil, which becomes a strong electric magnet when electricity

is supplied, strongly pulls clutch disc and presses it to pulley.

• When A/C relay integrated in IPDM E/R turns ON, electricity is

supplied to field coil, clutch disc is pressed to pulley, and engine
rotational movement is transmitted from crankshaft pulley 

⇒

 drive

belt 

⇒

 pulley 

⇒

 clutch disc 

⇒

 drive shaft. Compressor is operated.

When A/C relay turns OFF, electricity is not supplied to field coil,
and clutch disc is released from pulley. Compressor is not oper-
ated.

JMIIA1767GB

Revision: 2012 October

2013 Murano CrossCabriolet

SYSTEM

HAC-11

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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SYSTEM

System Diagram

INFOID:0000000008460628

System Description

INFOID:0000000008460629

DESCRIPTION

• Automatic air conditioning system is controlled by each function of A/C auto amp., ECM and IPDM E/R.
• Each operation of air conditioning system can be controlled by preset switch.

CONTROL BY A/C AUTO AMP.

•

HAC-12, "Temperature Control"

•

HAC-13, "Air Outlet Control"

•

HAC-13, "Air Flow Control"

•

HAC-14, "Air Inlet Control"

•

HAC-14, "Compressor Control"

•

HAC-15, "Door Control"

• Correction for input value

Ambient temperature correction

- A/C auto amp. inputs the temperature detected by ambient sensor as the ambient temperature. 
- A/C auto amp. performs the correction of the temperature detected by ambient sensor for air conditioning

control. 

- A/C auto amp. selects and uses the initial value of ambient temperature data depending on the engine cool-

ant temperature when turning the ignition switch from OFF to ON. The detection temperature of the ambient
sensor is used when engine coolant temperature is low [less than approximately 56

°

C (133

°

F)]. The mem-

ory data (before the ignition switch is OFF) when the engine is warmed up [approximately 56

°

C (133

°

F) or

more]. 

- The correction of the ambient temperature is not performed when the detection temperature of the ambient

temperature is less than approximately 

−

20

°

C (–4

°

F). 

JSIIA1542GB

Revision: 2012 October

2013 Murano CrossCabriolet

HAC-12

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

In-vehicle temperature correction

- A/C auto amp. inputs the temperature detected by in-vehicle sensor as the in-vehicle temperature. 
- A/C auto amp. performs the correction of the temperature detected by in-vehicle sensor for air conditioning

control. 

- A/C auto amp. performs the correction so that the recognition passenger room temperature changes

depending on the difference between the detected passenger room temperature and the recognition pas-
senger room temperature. If the difference is large, the changing is early. The changing becomes slow as
the difference becomes small. 

Intake temperature correction

- A/C auto amp. inputs the temperature detected by intake sensor as the intake temperature (evaporator tem-

perature).

- A/C auto amp. performs the correction of the temperature detected by intake sensor for air conditioning con-

trol. 

- A/C auto amp. performs the correction so that the recognition intake temperature changes depending on the

difference between the detected intake temperature and the recognition intake temperature. If the difference
is large, the changing is early. The changing becomes slow as the difference becomes small. 

Sunload amount correction

- A/C auto amp. inputs the sunload amount detected by sunload sensor. 
- A/C auto amp. performs the correction of the sunload amount detected by sunload sensor for air condition-

ing control. 

- When the sunload amount suddenly changes, for example when entering a tunnel, perform the correction so

that the recognition sunload amount of the A/C auto amp. changes slowly. 

Set temperature correction

- A/C auto amp. performs the correction to the target temperature set by the temperature control dial so as to

match the temperature felt by the passengers depending on the ambient temperature detected by ambient
sensor and controls it so that the in-vehicle temperature is always the most suitable. 

CONTROL BY ECM

•

HAC-14, "Compressor Control"

• Cooling fan control. Refer to 

EC-40, "COOLING FAN CONTROL : System Description"

.

CONTROL BY IPDM E/R

•

HAC-14, "Compressor Control"

• Cooling fan control. Refer to 

PCS-5, "RELAY CONTROL SYSTEM : System Description"

.

Temperature Control

INFOID:0000000008460630

• When ignition switch is in the ON position, A/C auto amp. always

automatically controls temperature regardless of air conditioning
system operational state.

• A/C auto amp. calculates the target air mix door opening angle

depending on set temperature, in-vehicle temperature, ambient
temperature, and sunload.

• Air mix door is controlled depending on the comparison of current

air mix door opening angle and target air mix door opening angle.

• Regardless of in-vehicle temperature, ambient temperature, and

sunload, air mix door is fixed at the fully cold position when set
temperature is 60

°

F, and at the fully hot position when set temper-

ature is 90

°

F.

JPIIA0633GB

Revision: 2012 October

2013 Murano CrossCabriolet

SYSTEM

HAC-13

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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Air Outlet Control

INFOID:0000000008460631

• While air outlet is in automatic control, A/C auto amp. selects the

mode door position depending on a target 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.

Air Flow Control

INFOID:0000000008460632

DESCRIPTION

• A/C auto amp. changes duty ratio of blower motor control signal to control air flow continuously. When air

flow is increased, duty ratio of blower motor control signal gradually increases to prevent a sudden increase
in air flow.

• In addition to manual control and automatic control, air flow control is compose of starting air flow control,

low coolant temperature starting control, high in-vehicle 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 air mix door opening angle.
• A/C auto amp. changes duty ratio of blower motor control signal to control air flow continuously so that air

flow matches to target air flow.

• When air outlet is VENT or B/L, the minimum air flow is changed

depending on sunload.

STARTING AIR FLOW CONTROL

When blower motor is activated, A/C auto amp. gradually increases duty ratio of blower motor control signal to
prevent a sudden increase in discharge air flow. It takes approximately 8 seconds for air flow to reach HI from
LOW.
NOTE:
Do not perform the starting air flow control when the discharge outlet
is set to DEF.

LOW COOLANT TEMPERATURE STARTING CONTROL

JMIIA0710GB

JMIIA0712GB

JSIIA1528GB

Revision: 2012 October

2013 Murano CrossCabriolet

HAC-14

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

If the engine coolant temperature is 56

°

C (133

°

F) or less, to prevent

a cold discharged air flow, A/C auto amp. suspends blower motor
activation for the maximum 150 seconds depending on target air mix
door opening angle. After this, blower motor control signal is
increased gradually, and blower motor is activated.

FAN SPEED CONTROL AT DOOR MOTOR OPERATION

When mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces
temporarily fan speed so that mode door moves smoothly.

HIGH IN-VEHICLE TEMPERATURE STARTING CONTROL

When evaporator fin temperature is high [intake air temperature sensor value is 35

°

C (95

°

F) or more], to pre-

vent a hot discharged air flow, A/C auto amp. suspends blower motor activation for approximately 3 seconds
so that evaporator is cooled by refrigerant.

Air Inlet Control

INFOID:0000000008460633

While air inlet is in automatic control, A/C auto amp. selects air inlet
(fresh air intake, 20% fresh air intake, or recirculation) depending on
set temperature, in-vehicle temperature, and ambient temperature.

Compressor Control

INFOID:0000000008460634

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 line.

• ECM judges the conditions of each sensor (refrigerant pressure sensor signal, accelerator position signal,

etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line.

• By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and acti-

vates the compressor. Refer to 

PCS-5, "RELAY CONTROL SYSTEM : System Description"

.

CONTROL BY A/C AUTO AMP.

Low Temperature Protection Control

Turn the A/C relay to OFF and stop the compressor by the signal from the A/C auto amp. according to the
evaporator fin temperature detected by the intake sensor and he ambient temperature detected by the ambi-
ent sensor.

CONTROL BY ECM

Compressor Protection Control at Pressure Malfunction

When the high-pressure side value that is detected by refrigerant 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 (31.8 kg/cm

2

, 452 psi) or more (When the engine speed is less than 1,500 rpm)

• 0.12 MPa (1.2 kg/cm

2

, 17 psi) or less

Air Conditioning Cut Control

When the engine condition is high load, ECM transmit A/C relay OFF request to IPDM E/R, and stops the
compressor. Refer to 

EC-38, "AIR CONDITIONING CUT CONTROL : System Description"

.

JSIIA1529GB

JMIIA0711GB

Revision: 2012 October

2013 Murano CrossCabriolet

SYSTEM

HAC-15

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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Door Control

INFOID:0000000008460635

DOOR MOTOR CONTROL

• LCU (Local Control Unit) is built into each door motor. And detects door position by PBR (Potentio Balance

Resistor). 

• A/C auto amp. communicates with each LCU via communication line. And receives each door position feed-

back signal from each LCU.

• Each LCU controls each door to the appropriate position depending on the control signal from A/C auto amp. 
• Each LCU transmits the signal of door movement completion to A/C auto amp., when the door movement is

completed.

SWITCH AND THEIR CONTROL FUNCTION

JPIIA0495GB

JPIIA0445GB

Revision: 2012 October

2013 Murano CrossCabriolet