Murano Cross Cabriolet Z51 (2012 year). Manual — part 45

HAC-58

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

B263D, B263E, B263F INTAKE DOOR MOTOR

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-78, "Removal and Installation"

.

NO

>> Repair harness or connector.

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M304

3

M50

10

Existed

Revision: 2013 February

2012 Murano CrossCabriolet

B2661, B2662, B2663 UPPER VENTILATOR DOOR MOTOR

HAC-59

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

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M

A

B

HAC

N

O

P

B2661, B2662, B2663 UPPER VENTILATOR DOOR MOTOR

DTC Logic

INFOID:0000000007563441

DTC DETECTION LOGIC

NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

HAC-

36, "DTC Logic"

.

• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010.

HAC-37,

"DTC Logic"

.

• If all of door motors DTC (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"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1.

Turn ignition switch ON.

2.

Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.

3.

Check DTC.

Is DTC detected?

YES

>> Refer to

HAC-59, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000007563442

1.

CHECK UPPER VENTILATOR DOOR MOTOR POWER SUPPLY

1.

Turn ignition switch ON.

2.

Check voltage between upper vent door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

CHECK UPPER VENTILATOR DOOR MOTOR GROUND CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect upper vent door motor and A/C auto amp. connector.

3.

Check continuity between upper vent door motor harness connector and ground.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B2661

UPPER VENT DOOR MOT

When the malfunctioning upper ventila-
tor door position is detected at OPEN
position

• Harness or connectors

(Upper ventilator door motor circuit is
open or shorted)

• Upper ventilator door motor system in-

stallation condition

• Upper ventilator door motor
• A/C auto amp.

B2662

When the malfunctioning upper ventila-
tor door position is detected at middle
position

B2663

When the malfunctioning upper ventila-
tor door position is detected at shut po-
sition

+

−

Voltage

(Approx.)

Upper vent door motor

Connector

Terminal

M308

1

Ground

12 V

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-60

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

B2661, B2662, B2663 UPPER VENTILATOR DOOR MOTOR

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK UPPER VENTILATOR DOOR MOTOR LAN SIGNAL

1.

Connect upper vent door motor and A/C auto amp. connector.

2.

Turn ignition switch ON.

3.

Confirm output waveform between upper vent door motor harness connector and ground using oscillo-
scope.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 6.

4.

CHECK INSTALLATION OF UPPER VENTILATOR DOOR MOTOR

Check upper ventilator door motor is properly installed. Refer to

HAC-85, "Exploded View"

.

Is the inspection result normal?

YES

>> Replace upper ventilator door motor. Refer to

HAC-87, "UPPER VENTILATOR DOOR MOTOR :

Removal and Installation"

.

NO

>> Repair or replace malfunctioning part.

5.

CHECK UPPER VENTILATOR DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect upper vent door motor and A/C auto amp. connector.

3.

Check continuity between upper vent door motor harness connector and A/C auto amp. harness connec-
tor.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-78, "Removal and Installation"

.

NO

>> Repair harness or connector.

6.

CHECK UPPER VENTILATOR DOOR MOTOR LAN SIGNAL CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect upper vent door motor and A/C auto amp. connector.

3.

Check continuity between upper vent door motor harness connector and A/C auto amp. harness connec-
tor.

Upper vent door motor

—

Continuity

Connector

Terminal

M308

2

Ground

Existed

+

−

Output waveform

Upper vent door motor

Connector

Terminal

M308

3

Ground

SJIA1453J

Upper vent door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M308

1

M50

11

Existed

Revision: 2013 February

2012 Murano CrossCabriolet

B2661, B2662, B2663 UPPER VENTILATOR DOOR MOTOR

HAC-61

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

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E

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A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-78, "Removal and Installation"

.

NO

>> Repair harness or connector.

Upper vent door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M308

3

M50

10

Existed

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-62

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

A/C AUTO AMP.

A/C AUTO AMP. : Diagnosis Procedure

INFOID:0000000007563443

1.

CHECK SYMPTOM

Check symptom (A or B).

Which symptom is detected?

A

>> GO TO 2.

B

>> GO TO 5.

2.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 10A fuse (No. 3 and 19, located in fuse block (J/B)].
NOTE:
Refer to

PG-34, "Fuse, Connector and Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

3.

CHECK A/C AUTO AMP. IGNITION POWER SUPPLY AND ACC POWER SUPPLY

1.

Disconnect A/C auto amp. connector.

2.

Turn ignition switch ON.

3.

Check voltage between A/C auto amp. harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector between A/C auto amp. and fuse.

4.

CHECK A/C AUTO AMP. GROUND CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Check continuity between A/C auto amp. harness connector and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-78, "Removal and Installation"

.

NO

>> Repair harness or connector.

Symptom

A

• Air conditioning does not activate.
• Air conditioning cannot be controlled.
• Operation status of air conditioning is not indicated on display.

B

• Memory function does not operate normally.
• The setting is not maintained. (It returns to the initial condition)

+

−

Voltage

A/C auto amp.

Connector

Terminal

M50

17

Ground

Battery voltage

20

A/C auto amp.

—

Continuity

Connector

Terminal

M50

19

Ground

Existed

39

Revision: 2013 February

2012 Murano CrossCabriolet

POWER SUPPLY AND GROUND CIRCUIT

HAC-63

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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5.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 10A fuse (No. 6, located in fuse block (J/B)].
NOTE:
Refer to

PG-34, "Fuse, Connector and Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

6.

CHECK A/C AUTO AMP. BATTERY POWER SUPPLY

1.

Disconnect A/C auto amp. connector.

2.

Check voltage between A/C auto amp. harness connector and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-78, "Removal and Installation"

.

NO

>> Repair harness or connector between A/C auto amp. and fuse.

+

−

Voltage

A/C auto amp.

Connector

Terminal

M50

40

Ground

Battery voltage

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-64

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

DOOR MOTOR

DOOR MOTOR

Diagnosis Procedure

INFOID:0000000007563444

NOTE:
Check this circuit when all of door motors DTC (B2632, B2633, B2634, B2635, B2636, B2637, B2638, B2639,
B263D, B263E, B263F, B2654, B2655, B2661, B2662, and B2663) are detected.

1.

CHECK DOOR MOTOR POWER SUPPLY

1.

Turn ignition switch ON.

2.

Check voltage between intake door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 7.

2.

CHECK DOOR MOTOR GROUND CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect intake door motor and A/C auto amp. connector.

3.

Check continuity between intake door motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK DOOR MOTOR LAN SIGNAL

1.

Connect A/C auto amp. and intake door motor connector.

2.

Turn ignition switch ON.

3.

Confirm output waveform between A/C auto amp. harness connector and ground using oscilloscope.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 6.

4.

CHECK DOOR MOTOR LAN SIGNAL CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. and intake door motor connector.

+

−

Voltage

(Approx.)

Intake door motor

Connector

Terminal

M304

1

Ground

12 V

Intake door motor

—

Continuity

Connector

Terminal

M304

2

Ground

Existed

+

−

Output waveform

A/C auto amp.

Connector

Terminal

M50

5

Ground

SJIA1453J

Revision: 2013 February

2012 Murano CrossCabriolet

DOOR MOTOR

HAC-65

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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B

HAC

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3.

Check continuity between A/C auto amp. harness connector and intake door motor harness connector.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

5.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to

GI-40, "Intermittent Incident"

.

>> INSPECTION END

6.

CHECK DOOR MOTOR LAN SIGNAL CIRCUIT FOR SHORT

1.

Turn ignition switch OFF.

2.

Disconnect following connectors.

-

A/C auto amp.

-

Air mix door motor LH

-

Air mix door motor RH

-

Mode door motor

-

Intake door motor

3.

Check continuity between A/C auto amp. harness connector and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-78, "Removal and Installation"

.

NO

>> Repair harness or connector.

7.

CHECK DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect intake door motor and A/C auto amp. connector.

3.

Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair harness or connector.

8.

CHECK DOOR MOTOR POWER SUPPLY CIRCUIT FOR SHORT

1.

Disconnect following connectors.

-

A/C auto amp.

-

Air mix door motor LH

-

Air mix door motor RH

-

Mode door motor

2.

Check continuity between A/C auto amp. harness connector and ground.

A/C auto amp.

Intake door motor

Continuity

Connector

Terminal

Connector

Terminal

M50

10

M304

3

Existed

A/C auto amp.

—

Continuity

Connector

Terminal

M50

10

Ground

Not existed

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M304

1

M50

11

Existed

A/C auto amp.

—

Continuity

Connector

Terminal

M50

11

Ground

Not existed

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-66

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

DOOR MOTOR

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-78, "Removal and Installation"

.

NO

>> Repair harness or connector.

Revision: 2013 February

2012 Murano CrossCabriolet

BLOWER MOTOR

HAC-67

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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HAC

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BLOWER MOTOR

Diagnosis Procedure

INFOID:0000000007563445

1.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 15A fuse [No. 21 and 22, located in fuse block (J/B)].
NOTE:
Refer to

PG-34, "Fuse, Connector and Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

2.

CHECK BLOWER MOTOR POWER SUPPLY

1.

Disconnect blower motor connector.

2.

Turn ignition switch ON.

3.

Check voltage between blower motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 6.

3.

CHECK BLOWER MOTOR GROUND CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Check continuity between blower motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK BLOWER MOTOR CONTROL SIGNAL CIRCUIT FOR OPEN

1.

Disconnect A/C auto amp. connector.

2.

Check continuity between blower motor harness connector and A/C auto amp. harness connector.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

5.

CHECK BLOWER MOTOR CONTROL SIGNAL

1.

Reconnect blower motor connector and A/C auto amp. connector.

2.

Turn ignition switch ON.

3.

Operate MODE switch to set air outlet to VENT position.

4.

Change fan speed from Lo to Hi, and check duty ratios between blower motor harness connector and
ground by using an oscilloscope.

+

−

Voltage

Blower motor

Connector

Terminal

M98

1

Ground

Battery voltage

Blower motor

—

Continuity

Connector

Terminal

M98

3

Ground

Existed

Blower motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M98

2

M50

32

Existed

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-68

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

BLOWER MOTOR

NOTE:
Calculate drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms

Is the inspection result normal?

YES

>> Replace blower motor. Refer to

VTL-21, "Removal and Installation"

.

NO

>> Replace A/C auto amp. Refer to

HAC-78, "Removal and Installation"

.

6.

CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect fuse block (J/B) connector.

3.

Check continuity between fuse block (J/B) harness connector and blower motor harness connector.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK BLOWER RELAY GROUND CIRCUIT FOR OPEN

Check continuity between fuse block (J/B) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair harness or connector.

8.

CHECK BLOWER RELAY

Check blower relay. Refer to

HAC-69, "Component Inspection (Blower Relay)"

.

Is the inspection result normal?

YES

>> Check blower relay power supply circuit. Refer to

PG-11, "Wiring Diagram - BATTERY POWER

SUPPLY -"

and

PG-28, "Wiring Diagram - IGNITION POWER SUPPLY -"

.

NO

>> Replace blower relay.

Component Inspection (Blower Motor)

INFOID:0000000007563446

1.

CHECK BLOWER MOTOR-I

1.

Remove blower motor. Refer to

VTL-21, "Removal and Installation"

.

Blower motor

Condition

Duty ratio

(Approx.)

Connector

Terminal

Fan speed (manual)

VENT mode

M98

2

1st

25 %

2nd

33 %

3rd

41 %

4th

51 %

5th

61 %

6th

69 %

7th

81 %

JPLIA1210GB

Fuse block (J/B)

Blower motor

Continuity

Connector

Terminal

Connector

Terminal

M1

3A

M98

3

Existed

8A

Fuse block (J/B)

—

Continuity

Connector

Terminal

M3

7C

Ground

Existed

Revision: 2013 February

2012 Murano CrossCabriolet

BLOWER MOTOR

HAC-69

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

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A

B

HAC

N

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2.

Check that there is not any mixing foreign object in the blower motor.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace blower motor. Refer to

VTL-21, "Removal and Installation"

.

2.

CHECK BLOWER MOTOR-II

Check that there is not breakage or damage in the blower motor.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace blower motor. Refer to

VTL-21, "Removal and Installation"

.

3.

CHECK BLOWER MOTOR-III

Check that blower motor turns smoothly.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace blower motor. Refer to

VTL-21, "Removal and Installation"

.

Component Inspection (Blower Relay)

INFOID:0000000007563447

1.

CHECK BLOWER RELAY

1.

Remove blower relay. Refer to

PG-34, "Fuse, Connector and Terminal Arrangement"

.

2.

Check continuity between blower relay terminal 3 and 5 when
voltage is supplied between terminal 1 and 2.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace blower relay.

Terminal

Voltage

Continuity

3

5

ON

Existed

OFF

Not existed

JSIIA1551ZZ

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-70

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

MAGNET CLUTCH

MAGNET CLUTCH

Component Function Check

INFOID:0000000007563448

1.

CHECK MAGNET CLUTCH OPERATION

Perform auto active test of IPDM E/R. Refer to

PCS-10, "Diagnosis Description"

.

Does it operate normally?

YES

>> INSPECTION END

NO

>> Refer to

HAC-70, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000007563449

1.

CHECK MAGNET CLUTCH

1.

Turn ignition switch OFF.

2.

Disconnect compressor connector.

3.

Directly apply battery voltage to the magnet clutch. Check for operation visually and by sound.

Does it operate normally?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK FUSE

Check 10A fuse (No. 49, located in IPDM E/R).
NOTE:
Refer to

PG-36, "Fuse, Connector and Terminal Arrangement"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

3.

CHECK MAGNET CLUTCH POWER SUPPLY CIRCUIT FOR OPEN

1.

Disconnect IPDM E/R connector.

2.

Check continuity between IPDM E/R harness connector and compressor harness connector.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to

PCS-31, "Removal and Installation"

.

NO

>> Repair harness or connector.

4.

CHECK MAGNET CLUTCH GROUND CIRCUIT FOR OPEN

Check continuity between compressor harness connector and ground.

Is the inspection result normal?

YES

>> Replace magnet clutch. Refer to

HA-31, "MAGNET CLUTCH : Removal and Installation of Com-

pressor Clutch"

.

NO

>> Repair harness or connector.

IPDM E/R

Compressor

Continuity

Connector

Terminal

Connector

Terminal

F12

48

F18

1

Existed

Compressor

—

Continuity

Connector

Terminal

F18

2

Ground

Existed

Revision: 2013 February

2012 Murano CrossCabriolet

AUTOMATIC AIR CONDITIONING SYSTEM

HAC-71

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

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B

HAC

N

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SYMPTOM DIAGNOSIS

AUTOMATIC AIR CONDITIONING SYSTEM

Symptom Table

INFOID:0000000007563450

NOTE:
Perform self-diagnoses with CONSULT before performing the symptom diagnosis. If any DTC is detected,
perform the corresponding diagnosis.

Symptom

Corresponding malfunction part

Check item/Reference

• Air conditioning does not ac-

tivate.

• Air conditioning cannot be

controlled.

• Operation status of air condi-

tioning is not indicated on
display.

Fail-safe activates

Multi AV system

• BOSE audio without naviga-

tion:

AV-95, "Symptom Table"

• BOSE audio with navigation:

AV-224, "Symptom Table"

Fail-safe does not acti-
vate

• A/C auto amp. ignition power supply

circuit and ACC power supply circuit

• A/C auto amp.

HAC-62, "A/C AUTO AMP. : Di-
agnosis Procedure"

• Memory function does not operate normally.
• The setting is not maintained. (It returns to initial condi-

tion)

• A/C auto amp. battery power supply

circuit

• A/C auto amp.

HAC-62, "A/C AUTO AMP. : Di-
agnosis Procedure"

Discharge air temperature (driver side) does not change.

Air mix door motor (driver side) system
installation condition

Check air mix door motor (driver
side) system is properly in-
stalled. Refer to

HAC-85, "Ex-

ploded View"

.

Discharge air temperature (passenger side) does not
change.

Air mix door motor (passenger side)
system installation condition

Check air mix door motor (pas-
senger side) system is properly
installed. Refer to

HAC-85, "Ex-

ploded View"

.

Air outlet does not change.

Mode door motor system installation
condition

Check mode door motor system
is properly installed. Refer to

HAC-85, "Exploded View"

.

Air inlet does not change.

Intake door motor system installation
condition

Check intake door motor system
is properly installed. Refer to

HAC-85, "Exploded View"

.

Blower motor does not operate.

• Blower motor power supply circuit.
• Blower motor control signal circuit
• Blower motor
• A/C auto amp.

HAC-67, "Diagnosis Procedure"

Compressor does not operate.

• Magnet clutch
• The circuit between magnet clutch

and IPDM E/R

• IPDM E/R (A/C relay)
• The circuit between ECM and refrig-

erant pressure sensor

• Refrigerant pressure sensor
• A/C auto amp. output signal (A/C

ON signal and blower fan ON signal)

• A/C auto amp.

HAC-76, "Diagnosis Procedure"

• Insufficient cooling
• No cool air comes out. (Air flow volume is normal.)

• Magnet clutch control system
• Drive belt slipping
• Cooler cycle
• Air leakage from each duct
• A/C auto amp. connection recogni-

tion signal circuit

• Temperature setting trimmer

HAC-73, "Diagnosis Procedure"

Revision: 2013 February

2012 Murano CrossCabriolet

HAC-72

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

AUTOMATIC AIR CONDITIONING SYSTEM

• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)

• Engine cooling system
• Heater hose
• Heater core
• Air leakage from each duct
• Temperature setting trimmer

HAC-75, "Diagnosis Procedure"

Noise is heard when the air
conditioning operates.

During compressor op-
eration

Cooler cycle

HA-28, "Symptom Table"

During blower motor op-
eration

• Mixing any foreign object in blower

motor

• Blower motor fan breakage
• Blower motor rotation inferiority

HAC-68, "Component Inspec-
tion (Blower Motor)"

Symptom

Corresponding malfunction part

Check item/Reference

Revision: 2013 February

2012 Murano CrossCabriolet

INSUFFICIENT COOLING

HAC-73

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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HAC

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INSUFFICIENT COOLING

Description

INFOID:0000000007563451

Symptom

• Insufficient cooling
• No cool air comes out. (Air flow volume is normal.)

Diagnosis Procedure

INFOID:0000000007563452

NOTE:
Perform self-diagnoses with CONSULT before performing symptom diagnosis. If any DTC is detected, per-
form the corresponding diagnosis.

1.

CHECK MAGNET CLUTCH OPERATION

1.

Turn ignition switch ON.

2.

Operate fan control dial.

3.

Press A/C switch.

4.

Check that A/C indicator turns ON. Check visually and by sound that compressor operates.

5.

Press A/C switch again.

6.

Check that A/C indicator turns OFF. Check that compressor stops.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform diagnosis of “COMPRESSOR DOES NOT OPERATE” in “SYMPTOM DIAGNOSIS”.

Refer to

HAC-76, "Diagnosis Procedure"

.

2.

CHECK DRIVE BELT

Check tension of drive belt. Refer to

EM-14, "Checking"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Adjust or replace drive belt depending on the inspection results.

3.

CHECK REFRIGERANT CYCLE PRESSURE

Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.
Refer to

HA-26, "Symptom Table"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace parts depending on the inspection results.

4.

CHECK AIR LEAKAGE FROM EACH DUCT

Check duct and nozzle, etc. of the air conditioning system for leakage.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace parts depending on the inspection results.

5.

CHECK AMBIENT TEMPERATURE DISPLAY

Check that there is not much difference between actual ambient temperature and indicated temperature on
information display in combination meter.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Perform diagnosis for the A/C auto amp. connection recognition signal circuit. Refer to

MWI-59,

"Diagnosis Procedure"

.

6.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER

1.

Check setting value of temperature setting trimmer. Refer to

HAC-34, "Temperature Setting Trimmer"

.

2.

Check that temperature setting trimmer is set to “+ direction”.
NOTE:
The control temperature can be set by setting of the temperature setting trimmer.

Revision: 2013 February

2012 Murano CrossCabriolet