air condition INFINITI QX56 2011 Factory Service Manual

HAC-140
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
INSUFFICIENT HEATING
INSUFFICIENT HEATING
FRONT AIR CONDITIONER
FRONT AIR CONDITIONER : DescriptionINFOID:0000000006275990
Symptom Insufficient heating
 No warm air comes out. (Air flow volume is normal.)
FRONT AIR CONDITIONER
: Diagnosis ProcedureINFOID:0000000006275991
NOTE:
Perform self-diagnoses with on board diagnosis and CO NSULT-III before performing symptom diagnosis. If
DTC is detected, perform the corresponding diagnosis.
1.CHECK COOLING SYSTEM
1. Check engine coolant level and check leakage. Refer to CO-8, "
Inspection".
2. Check reservoir tank cap. Refer to CO-11, "
RESERVOIR TANK CAP : Inspection".
3. Check water flow sounds of the engine coolant. Refer to CO-9, "
Refilling".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Refill engine coolant and repair or repl ace parts depending on the inspection results.
2.CHECK HEATER HOSE
Check installation of heater hose by visually or touching.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace parts depending on the inspection results.
3.CHECK FRONT HEATER CORE
1. Check temperature of inlet hose and outlet hose of front heater core.
2. Check that inlet side of front heater core is hot and t he outlet side is slightly lower than/almost equal to the
inlet side.
CAUTION:
Always perform the temperature in spection in a short period of time because the engine coolant
temperature is very hot.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace front heater core. Refer to HA-44, "
HEATER CORE : Removal and Installation".
4.CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of front air conditioning system for air leakage.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace parts depending on the inspection results.
5.CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)
1. Check setting value of temperature setting trimmer (front). Refer to HAC-68, "
FRONT AUTOMATIC AIR
CONDITIONING SYSTEM : Temperature Setting Trimmer (Front)".
2. Check that temperature setting trimmer (front) is set to “ − direction”.
NOTE:
The control temperature can be set by t he temperature setting trimmer (front).
3. Set difference between the set temperature and control temperature to “0”.
Are the symptoms solved?
YES >> INSPECTION END
NO >> Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
REAR AIR CONDITIONER
Revision: 2010 May2011 QX56

INSUFFICIENT HEATINGHAC-141
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REAR AIR CONDITIONER : DescriptionINFOID:0000000006275992
Symptom
 Insufficient heating
 No warm air comes out. (Air flow volume is normal.)
REAR AIR CONDITIONER : Diagnosis ProcedureINFOID:0000000006275993
CAUTION:
Perform the self-diagnoses with on board diagnosi s and CONSULT-III before performing symptom
diagnosis. If any malfunction result or DTC is detected, perform the corresponding diagnosis.
1.CHECK COOLING SYSTEM
1. Check engine coolant level and check leakage. Refer to CO-8, "
Inspection".
2. Check reservoir tank cap. Refer to CO-11, "
RESERVOIR TANK CAP : Inspection".
3. Check water flow sounds of the engine coolant. Refer to CO-9, "
Refilling".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Refill the engine coolant and repair or replace the parts depending on the inspection results.
2.CHECK HEATER HOSE
Check installation of heater hose by visually or touching.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace parts depending on the inspection results.
3.CHECK REAR HEATER CORE
1. Check temperature of inlet hose and outlet hose of rear heater core.
2. Check that the inlet side of rear heater core is hot and the outlet side is slightly lower than/almost equal to
the inlet side.
CAUTION:
Always perform the temperature inspection in a sh ort period of time because the engine coolant
temperature is very hot.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace rear heater core. Refer to HA-48, "
HEATER CORE : Removal and Installation".
4.CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of the rear air conditioning system for air leakage.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace parts depending on the inspection results.
5.CHECK SETTING OF TEMPERATURE SETTING TRIMMER (REAR)
1. Check setting value of temperature setting trimmer (rear). Refer to HAC-69, "
REAR AUTOMATIC AIR
CONDITIONING SYSTEM : Temperature Setting Trimmer (Rear)".
2. Check that the temperature setting trimmer is set to “ − direction”.
NOTE:
The control temperature can be set by the temperature setting trimmer (rear).
3. Set the difference between the set temperature (rear) and control temperature to “0”.
Are the symptoms solved?
YES >> INSPECTION END
NO >> Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
Revision: 2010 May2011 QX56

HAC-142
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
COMPRESSOR DOSE DOT OPERATE
COMPRESSOR DOSE DOT OPERATE
DescriptionINFOID:0000000006275994
Symptom: Compressor dose not operate.
Diagnosis ProcedureINFOID:0000000006275995
NOTE:
 Perform self-diagnoses with CONSULT-III before perfo
rming symptom diagnosis. If DTC is detected, per-
form the corresponding diagnosis.
 Check that refrigerant is enclosed in cooler cycle normally. If refrigerant amount is shortage from proper
amount, perform inspection of refrigerant leakage.
1.CHECK MAGNET CLUTCH OPERATION
Check magnet clutch. Refer to HAC-126, "
Component Function Check".
Does it operate normally?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning parts.
2.CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to EC-520, "
Component Function Check".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace malfunctioning parts.
3.CHECK A/C AUTO AMP. OUTPUT SIGNAL
With CONSULT-III
Check “COMP REQ SIG” and “FAN REQ SIG” in “DAT A MONITOR” mode of “HVAC” using CONSULT-III.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
4.CHECK ECM INPUT SIGNAL
With CONSULT-III
Check “AIR COND SIG” and “HEATER FAN SW” in “D ATA MONITOR” mode of “ECM” using CONSULT-III.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Check CAN communication system. Refer to LAN-18, "
Trouble Diagnosis Flow Chart".
5.CHECK IPDM E/R INPUT SIGNAL
With CONSULT-III
1. Start engine.
Monitor item Condition Status
COMP REQ SIG A/C switch ON On
OFF Off
FAN REQ SIG Front blower motor ON On
OFF Off
Monitor item Condition Status
COMP REQ SIG A/C switch ON On
OFF Off
HEATER FAN SW Front blower motor ON On
OFF Off
Revision: 2010 May2011 QX56

COMPRESSOR DOSE DOT OPERATEHAC-143
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2. Check “AC COMP REQ” in “DATA MONITOR” mode of “IPDM E/R” using CONSULT-III.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Check CAN communication system. Refer to LAN-18, "
Trouble Diagnosis Flow Chart".
Monitor item Condition Status
AC COMP REQ A/C switch ON On
OFF Off
Revision: 2010 May2011 QX56

HAC-144
< REMOVAL AND INSTALLATION >[AUTOMATIC AIR CONDITIONING]
FRONT A/C CONTROL
REMOVAL AND INSTALLATION
FRONT A/C CONTROL
Removal and InstallationINFOID:0000000006275996
REMOVAL
1. Remove cluster lid C. Refer to
IP-14, "Removal and Installation".
2. Remove preset switch. Refer to AV-227, "
Removal and Installation".
3. Disconnect harness connector from front A/C control.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56

REAR A/C CONTROLHAC-145
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONING]
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REAR A/C CONTROL
Removal and InstallationINFOID:0000000006275997
REMOVAL
1. Remove console rear finisher. Refer to IP-29, "Removal and Installation".
2. Remove fixing screws, and then remove rear A/C control.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56

HAC-146
< REMOVAL AND INSTALLATION >[AUTOMATIC AIR CONDITIONING]
A/C AUTO AMP.
A/C AUTO AMP.
Removal and InstallationINFOID:0000000006275999
REMOVAL
1. Remove cluster lid C lower. Refer to
IP-14, "Removal and Installation".
2. Remove AV control unit. Refer to AV-212, "
Removal and Installation".
3. Disconnect harness connector from A/C auto amp..
4. Remove fixing screws, and then remove A/C auto amp..
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56

AMBIENT SENSORHAC-147
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONING]
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AMBIENT SENSOR
Removal and InstallationINFOID:0000000006276000
REMOVAL
1. Remove front grill. Refer to EXT-19, "Removal and Installation".
2. Disengage the pawl, and then remove ambient sensor from bracket.
3. Disconnect ambient sensor connector, and then remove the ambient sensor.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56

HAC-148
< REMOVAL AND INSTALLATION >[AUTOMATIC AIR CONDITIONING]
IN-VEHICLE SENSOR
IN-VEHICLE SENSOR
FRONT A/C UNIT ASSEMBLY
FRONT A/C UNIT ASSEMBLY :
Removal and InstallationINFOID:0000000006276001
REMOVAL
1. Remove instrument lower panel LH. Refer to IP-14, "Removal and Installation".
2. Remove fixing screw, and then remove in-vehicle sensor.
INSTALLATION
Install in the reverse order of removal.
REAR A/C UNIT ASSEMBLY
REAR A/C UNIT ASSEMBLY : Removal and InstallationINFOID:0000000006276002
REMOVAL
1. Remove rear A/C unit assembly. Refer to HA-47, "REAR A/C UNIT ASSEMBLY : Removal and Installa-
tion".
2. Remove the intake sensor from rear A/C unit assembly.
INSTALLATION
Note the following items, and install in the reverse order of removal.
CAUTION:
 Replace O-rings with new ones. Then apply the compressor oil to them when installing.
 Mark the mounting position of intake sensor bracket prior to removal so that the reinstalled sensor
can be located in the same position.
 Never rotate the bracket insertion part when removing and installing the intake sensor.
 Check for leakages when recharging refrigerant. Refer to HA-18, "
Leak Test".
Revision: 2010 May2011 QX56

SUNLOAD SENSORHAC-149
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONING]
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SUNLOAD SENSOR
Removal and InstallationINFOID:0000000006276003
REMOVAL
1. Remove upper ventilator grill RH. Refer to VTL-10, "UPPER VENTILATOR GRILLE : Removal and Instal-
lation".
2. Remove sunload sensor from front defroster grill RH.
3. Disconnect harness connector from sunload sensor.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56