Murano Cross Cabriolet Z51 (2012 year). Manual — part 42

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:0000000007563391

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: 2013 February

2012 Murano CrossCabriolet

SYSTEM

HAC-11

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

SYSTEM

System Diagram

INFOID:0000000007563392

System Description

INFOID:0000000007563393

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

−

C (–4

F).

JSIIA1542GB

Revision: 2013 February

2012 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:0000000007563394

• 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

JPIIA0633GB

Revision: 2013 February

2012 Murano CrossCabriolet

SYSTEM

HAC-13

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

Air Outlet Control

INFOID:0000000007563395

• 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:0000000007563396

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: 2013 February

2012 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:0000000007563397

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:0000000007563398

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

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

• 0.12 MPa (1.2 kg/cm

, 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: 2013 February

2012 Murano CrossCabriolet

SYSTEM

HAC-15

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

Door Control

INFOID:0000000007563399

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: 2013 February

2012 Murano CrossCabriolet

HAC-16

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

*: Inlet status is displayed by indicator during activating automatic control

AIR DISTRIBUTION

Fail-safe

INFOID:0000000007563400

FAIL-SAFE FUNCTION

Switch/Dial position

Door position

Mode door

r ve

ila

r do

Air mix door

tila

r do

. co

ol do

fros

r do

(Driver side)

(Pa

sse

er s

)

AUTO switch

AUTO

—

MODE switch

DEF switch

Intake switch

—

UPPER VENT switch

—

A – B

Temperature control
dial (Driver side)

DUAL
switch:
OFF

—

F – 89

AUTO

DUAL
switch:
ON

—

F – 89

AUTO

Temperature control dial (Passen-
ger side)

—

F – 89

AUTO

ON·OFF switch

OFF

—

Discharge air flow

MODE/DEF

set position

Condition

Air outlet/distribution

Ventilator

Foot

Defroster

Front

Upper

Rear

Front

Rear

Center

Side

• DUAL

switch:
OFF

• UPPER

VENT
switch:
ON

40%

41%

11%

—

18%

24%

10%

17%

23%

—

12%

15.5%

27.5%

12%

21%

—

11%

14%

24%

11%

29%

—

11%

10.5%

12.5%

—

66%

Revision: 2013 February

2012 Murano CrossCabriolet

SYSTEM

HAC-17

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

When a communication error between A/C auto amp. and AV control unit and preset switch continued for
approximately 30 seconds or more, air conditioning is controlled under the following conditions.

Set temperature

: Setting before communication error occurs

Air outlet

: Automatic control

Air flow

: Automatic control

Air inlet

: Fresh air intake (FRE)

A/C switch

: ON

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-18

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

OPERATION

OPERATION

Switch Name and Function

INFOID:0000000007563401

OPERATION AND DISPLAY OF AUTOMATIC AIR CONDITIONING SYSTEM

Display: Display unit

BOSE audio with navigation

BOSE audio without navigation

• Air conditioning operation status is indicated on display in display unit.
• When “STATUS” on multifunction switch is pressed while air conditioning is in the ON position the display

changes to state indication display of air conditioning system. When air conditioning is operated while navi-
gation system or audio system is displayed, air conditioning state is indicated in the lower portion of display
for several seconds.

• When MODE switch is pressed while air conditioning is in the OFF position, state indication display is indi-

cated for several seconds.

Operation: Preset switch

JMIIA1887GB

JMIIA1888GB

Temperature control dial (driver side) 2.

AUTO switch

DEF switch

ON·OFF switch

DUAL switch

Temperature control dial (passenger
side)

JMIIA1889ZZ

Revision: 2013 February

2012 Murano CrossCabriolet

OPERATION

HAC-19

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

MODE switch

UPPER VENT switch

Fan control dial

10. Intake switch

11.

A/C switch

Switch name

Function

Temperature control
dial (driver side)

Setting temperature can be set according to dial operation within a range between 60

F – 90

F at a rate

of 1

F per adjustment.

• Clock wise rotation: Setting temperature increases
• Counterclockwise rotation: Setting temperature decreases
NOTE:
When air conditioning is OFF, setting temperature can be set only while air conditioning status screen
(only when MODE switch is pressed) is indicated.

AUTO switch

• AUTO switch indicator turns ON and air conditioning becomes the following status, when this switch is

pressed while air conditioning is ON.

- Air outlet: Automatic control
- Air flow: Automatic control
- Air inlet: Automatic control
- A/C switch: ON
• Air conditioning turns ON and operates according to the following status, when this switch is pressed

while air conditioning is OFF. (AUTO switch indicator turns ON)

- Air outlet: Automatic control
- Air flow: Automatic control
- Air inlet: Automatic control
- A/C switch: ON
NOTE:
When air outlet or air flow is manually operated while AUTO switch indicator is ON, AUTO switch indica-
tor turns OFF. However, automatic control continues for other functions than air outlet or air flow.

DEF switch

DEF mode (switch indicator) changes between ON

⇔

OFF each time switch is pressed.

• When this switch is pressed while air conditioning is ON
- Air conditioning becomes the following status when DEF mode is turned ON.
• Air outlet: DEF
• Air flow: Settings set before DEF mode is turned ON
• Air inlet: Fresh air intake
• A/C switch: ON
- Air conditioning becomes the following status when DEF mode is turned OFF.
• Air outlet: Settings set before DEF mode is turned ON
• Air flow: Settings set before DEF mode is turned OFF
• Air inlet: Settings set before DEF mode is turned OFF
• A/C switch: Settings set before DEF mode is turned OFF
• When this switch is pressed while air conditioning is OFF
- Air conditioning turns ON and operates in the following status, when DEF mode is turned ON.
• Air outlet: DEF
• Air flow: Automatic control
• Air inlet: Fresh air intake
• A/C switch: ON
- Air conditioning becomes the following status when DEF mode is turned OFF.
• Air outlet: Automatic control
• Air flow: Settings set before DEF mode is turned OFF
• Air inlet: Settings set before DEF mode is turned OFF
• A/C switch: Settings set before DEF mode is turned OFF
NOTE:
When DEF mode is turned ON while AUTO switch indicator is turned ON, AUTO switch indicator turns
OFF. However, automatic air flow control continues.

ON·OFF switch

Air conditioning turns ON

⇔

OFF each time this switch is pressed.

• When this switch is pressed while air conditioning is ON
- Air conditioning turns OFF and becomes the following status, when this switch is pressed.
• Air outlet: FOOT
• Air flow: OFF
• Air inlet: Fresh air intake
• A/C switch: OFF
• When this switch is pressed while air conditioning is OFF
- Air conditioning turns ON and operates according to the settings set before air conditioning is turned

OFF, when this switch is pressed.

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-20

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

OPERATION

DUAL switch

Left and right ventilation temperature separately control (switch indicator) changes between ON

⇔

OFF

each time this switch is pressed while blower motor is operated.
NOTE:
• Setting temperature for passenger side is the same as that for driver side when left and right ventilation

temperature separately control is OFF.

• DUAL switch operation is not accepted when DEF mode is ON.

Temperature control
dial (passenger side)

• Left and right ventilation temperature separately control (DUAL switch indicator) turns ON according

to dial operation. Air flow temperature of passenger side can be changed without changing air flow
temperature of driver side.

• Setting temperature can be set according to dial operation within a range between 60

F – 90

F at a

rate of 1

F per adjustment.

- Clock wise rotation: Setting temperature increases
- Counterclockwise rotation: Setting temperature decreases
NOTE:
• When air conditioning is OFF, setting temperature can be set only while air conditioning status screen

(only when MODE switch is pressed) is indicated.

• Temperature control dial (passenger side) operation is not accepted when DEF mode is ON.

MODE switch

Air outlet changes from VENT

⇒

B/L

⇒

FOOT

⇒

D/F

⇒

VENT each time this switch is pressed.

NOTE:
• Air outlet can be changed when air conditioning is in OFF status.
• Automatic air outlet control is cancelled (AUTO switch indicator turns OFF), when MODE switch is

pressed while AUTO switch indicator is ON.

UPPER VENT switch

Upper ventilator control (switch indicator) changes between ON

⇔

OFF each time this switch is pressed

while blower motor is operated.
NOTE:
• When air conditioning is OFF, upper ventilator control can be changed only while air conditioning status

screen (only when MODE switch is pressed) is indicated.

• UPPER VENT switch operation is not accepted when DEF mode is ON.

Fan control dial

• Air flow can be set within a range between 1st – 7th speed according to dial operation.
- Clock wise rotation: Air flow increases
- Counterclockwise rotation: Air flow decreases
• Air conditioning turns ON and operates according to the following status, when this switch is pressed

while air conditioning is OFF.

- Air outlet: Automatic control
- Air flow: Automatic control
- Air inlet: Settings set before fan control dial is operated
- A/C switch: Settings set before air conditioning is turned OFF
NOTE:
Automatic air flow control is cancelled (AUTO switch indicator turns OFF), when fan control dial is oper-
ated while AUTO switch indicator is ON.

Intake switch

• Air inlet changes between recirculation (REC)

⇔

fresh air intake (FRE) each time this switch is

pressed.

- Switch indicator ON: Recirculation
- Switch indicator OFF: Fresh air intake
• Switch indicator blinks 2 times and air inlet is set to automatic control when switch is pressed and held

for 2 seconds or more. (Switch indicator indicates air inlet status during automatic control)

NOTE:
• Air inlet can be changed when air conditioning is in OFF status.
• REC switch operation is not accepted when air outlet is D/F or DEF.
• A/C switch turns ON when REC switch is turned ON while A/C switch is OFF.

A/C switch

Compressor control (switch indicator) changes between ON

⇔

OFF each time this switch is pressed

while blower motor is operated.
NOTE:
• A/C switch cannot be turned ON when blower motor is OFF.
• A/C switch cannot be turned OFF when air outlet is D/F or DEF.
• Air inlet changes to fresh air intake when A/C switch is turned OFF while air inlet is set to recirculation.

Switch name

Function

Revision: 2013 February

2012 Murano CrossCabriolet

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

HAC-21

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

Description

INFOID:0000000007563402

Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings
using diagnosis function of each control unit.

CONSULT Function

INFOID:0000000007563403

CONSULT performs the following functions via CAN communication with A/C auto amp.

NOTE:
Diagnosis should be performed with engine running. Door motor operation speeds become slower and NO
results may be returned even for normal operation if battery voltage drops below 12 V during self-diagnosis.

ECU IDENTIFICATION

Part number of A/C auto amp. can be checked.

SELF-DIAGNOSIS RESULTS

Diagnosis result that is judged by A/C auto amp. can be checked. Refer to

HAC-25, "DTC Index"

DATA MONITOR

Input/output signal of A/C auto amp. can be checked.

Display item list

ECU

Diagnostic item

(CONSULT)

A/C auto amp.

HVAC

Self Diagnostic Result

Data Monitor

Active Test

Work support

AV control unit

MULTI AV

Self Diagnostic Result

Multi AV system on board diagnosis function

ECM

ENGINE

Self Diagnostic Result

Data Monitor

IPDM E/R

Self Diagnostic Result

Data Monitor

Auto active test

Diagnostic mode

Description

Ecu Identification

Displays the part number of A/C auto amp.

Self Diagnostic Result

Displays the diagnosis results judged by A/C auto amp.

Data Monitor

Displays the input/output signal of A/C auto amp.

Active Test

The signals used to activate each device are forcibly supplied from A/C auto amp.

Work support

Changes the setting for each setting function.

Monitor item [Unit]

Description

AMB TEMP SEN

[

C (

F)]

Ambient temperature value converted from ambient sensor signal received from ambi-
ent sensor

IN-VEH TEMP

[

C (

F)]

In-vehicle temperature value converted from in-vehicle sensor signal received from in-
vehicle sensor

INT TEMP SEN

[

C (

F)]

Evaporator fin temperature value converted from intake sensor signal received from in-
take sensor

SUNLOAD SEN

[w/m

]

Sunload value converted from sunload sensor signal received from sunload sensor

AMB SEN CAL

[

C (

F)]

Ambient temperature value calculated by A/C auto amp.

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-22

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

ACTIVE TEST

The signals used to activate each device forcibly supplied from A/C auto amp. operation check of air condi-
tioning system can be performed.

Check each output device

*: Position of mode door motor is set to the status of automatic control that is selected by foot position setting
trimmer. Refer to

HAC-35, "Foot Position Setting Trimmer"

NOTE:
Perform the inspection of each output device after starting the engine because the compressor is operated.

WORK SUPPORT

Setting change of each setting functions and automatic adjustment of components can be performed.

NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of WORK SUPPORT may be cancelled.

IN-VEH CAL

[

C (

F)]

In-vehicle temperature value calculated by A/C auto amp.

INT TEMP CAL

[

C (

F)]

Evaporator fin temperature value calculated by A/C auto amp.

SUNL SEN CAL

[w/m

]

Sunload value calculated by A/C auto amp.

COMP REQ SIG

[On/Off]

Displays A/C ON signal ON/OFF status transmitted to ECM.

FAN REQ SIG

[On/Off]

Displays blower fan ON signal ON/OFF status transmitted to ECM.

FAN DUTY

Duty ratio of blower motor judged by A/C auto amp.

Target discharge air temperature judged by A/C auto amp. depending on the tempera-
ture setting and the value from each sensor

ENG COOL TEMP

[

C (

F)]

Engine coolant temperature signal value received from ECM via CAN communication

VEHICLE SPEED

[km/h

(mph)]

Vehicle speed signal value received from combination meter via CAN communication

Monitor item [Unit]

Description

Test item

Description

HVAC TEST

The operation check of air conditioning system can be performed by selecting the mode.
Refer to the following table for the conditions of each mode.

Test item

MODE 1

MODE 2

MODE 3

MODE 4

MODE 5

MODE 6

MODE 7

Mode door motor position

VENT

B/L

FOOT

D/F

DEF

Intake door motor position

REC

20% FRE

FRE

Air mix door motor (driver side/
passenger side) position

FULL COLD

FULL HOT

FULL COLD

FULL HOT

Blower motor (duty ratio)

35%

61%

91%

35%

Magnet clutch

OFF

Upper ventilator door motor
position

OPEN

Work item

Description

Refer to

TEMP SET CORRECT

Setting change of temperature setting trimmer can be performed.

HAC-34, "Temperature
Setting Trimmer"

REC MEMORY SET

Setting change of inlet port memory function (REC) can be per-
formed.

HAC-34, "Inlet Port Mem-
ory Function (REC)"

FRE MEMORY SET

Setting change of inlet port memory function (FRE) can be per-
formed.

HAC-35, "Inlet Port Mem-
ory Function (FRE)"

BLOWER SET

Setting change of foot position setting trimmer can be performed.

HAC-35, "Foot Position
Setting Trimmer"

Revision: 2013 February

2012 Murano CrossCabriolet

A/C AUTO AMP.

HAC-23

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONING]

HAC

ECU DIAGNOSIS INFORMATION

A/C AUTO AMP.

Reference Value

INFOID:0000000007563404

CONSULT DATA MONITOR REFERENCE VALUES

TERMINAL LAYOUT

PHYSICAL VALUES

Monitor item

Condition

Value/Status

AMB TEMP SEN

Ignition switch ON

Equivalent to ambient tem-
perature

IN-VEH TEMP

Ignition switch ON

Equivalent to in-vehicle tem-
perature

INT TEMP SEN

Ignition switch ON

Equivalent to evaporator fin
temperature

SUNLOAD SEN

Ignition switch ON

Equivalent to sunload
amount

AMB SEN CAL

Ignition switch ON

Equivalent to ambient tem-
perature

IN-VEH CAL

Ignition switch ON

Equivalent to in-vehicle tem-
perature

INT TEMP CAL

Ignition switch ON

Equivalent to evaporator fin
temperature

SUNL SEN CAL

Ignition switch ON

Equivalent to sunload
amount

COMP REQ SIG

Engine: Run at idle after
warming up

A/C switch: ON
(Compressor operation sta-
tus)

A/C switch: OFF

Off

FAN REQ SIG

Engine: Run at idle after
warming up

Blower motor: ON

Blower motor: OFF

Off

FAN DUTY

Engine: Run at idle after
warming up

Blower motor: ON

25 – 81

Blower motor: OFF

Ignition switch ON

Value according to target air
flow temperature

ENG COOL TEMP

Ignition switch ON

Equivalent to engine coolant
temperature

VEHICLE SPEED

Driving

Equivalent to speedometer
reading

JMIIA0690ZZ

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-24

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONING]

A/C AUTO AMP.

Fail-safe

INFOID:0000000007563405

FAIL-SAFE FUNCTION

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

−

Signal name

Input/

Output

(L)

—

CAN-H

Input/

Output

—

(P)

—

CAN-L

Input/

Output

—

(L)

Ground

LAN signal

Input/

Output

Ignition switch ON

(R)

Ground

Door motor power supply

Output

Ignition switch ON

12 V

(O)

Ground

Sunload sensor signal

Input

Ignition switch ON

0 – 4.8 V

Output voltage varies with sun-

load amount

(G)

Ground

Intake sensor signal

Input

Ignition switch ON

0 – 4.8 V

Output voltage varies with evapo-

rator fin temperature

(R)

Ground

ACC power supply

—

Ignition switch ON

Battery voltage

(B)

Ground

—

Ignition switch ON

0 V

(G)

Ground

Ignition power supply

—

Ignition switch ON

Battery voltage

(L)

Ground

Blower motor control signal

Output

• Ignition switch ON
• Fan speed: 1st speed

(manual)

(P)

Ground

A/C auto amp. connection rec-
ognition signal

Output

Ignition switch ON

5 V

(L)

Ground

Ambient sensor signal

Input

Ignition switch ON

0 – 4.8 V

Output voltage varies with ambi-

ent temperature

(LG)

Ground

In-vehicle sensor signal

Input

Ignition switch ON

0 – 4.8 V

Output voltage varies with in-ve-

hicle temperature

(Y)

Ground

Sensor ground

—

Ignition switch ON

0 V

(B)

Ground

—

Ignition switch ON

0 V

(Y)

Ground

Battery power supply

—

Ignition switch OFF

Battery voltage

SJIA1453J

JSIIA0096ZZ

Revision: 2013 February

2012 Murano CrossCabriolet

A/C AUTO AMP.

HAC-25

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONING]

HAC

When a communication error between A/C auto amp. and AV control unit and preset switch continued for
approximately 30 seconds or more, air conditioning is controlled under the following conditions.

DTC Index

INFOID:0000000007563406

*: Perform self-diagnosis under sunshine. When performing indoors, aim a light (more than 60 W) at sunload
sensor, otherwise self-diagnosis indicates even though the sunload sensor is functioning normally.
NOTE:
If all of door motor DTCs (B2632, B2633, B2634, B2635, B2636, B2637, B2638, B2639, B263D, B263E,
B263F, B2654, B2655, B2661, B2662, and B2663) are detected, check “DOOR MOTOR” circuit. Refer to

HAC-64, "Diagnosis Procedure"

Set temperature

: Setting before communication error occurs

Air outlet

: Automatic control

Air flow

: Automatic control

Air inlet

: Fresh air intake (FRE)

A/C switch

: ON

DTC