2011 INFINITI QX56 air conditioning

HAC-150
< REMOVAL AND INSTALLATION >[AUTOMATIC AIR CONDITIONING]
INTAKE SENSOR
INTAKE SENSOR
Exploded ViewINFOID:0000000006276004
Refer to
HA-41, "Exploded View".
Removal and InstallationINFOID:0000000006276005
REMOVAL
1. Remove the front evaporator assembly. Refer to HA-43, "EVAPORATOR : Removal and Installation".
2. Remove the intake sensor from front evaporator.
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

EXHAUST GAS/OUTSIDE ODOR SENSORHAC-151
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONING]
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EXHAUST GAS/OUTS IDE ODOR SENSOR
Removal and InstallationINFOID:0000000006276007
REMOVAL
1. Remove bumper molding. Refer to EXT-13, "Removal and Installation".
2. Remove bolt, and then remove exhaust gas/outside odor sensor.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56

HAC-152
< REMOVAL AND INSTALLATION >[AUTOMATIC AIR CONDITIONING]
DOOR MOTOR
DOOR MOTOR
Exploded ViewINFOID:0000000006276008
Front A/C unit
Rear A/C unit
JMIIA0645ZZ
1. A/C unit assembly 2. Upper ventilator door lever 3. Upper ventilator door link
4. Upper ventilator door motor 5. Air mix door motor LH 6. Air mix door adaptor B
7. Air mix door adaptor A 8. Intake door motor 9. Intake door motor lever
10. Intake door lever 11. Blower unit assembly 12. Foot door lever
13. Foot door link 14. Air mix door motor RH 15. Air mix door adaptor
16. Mode door motor 17. Mode door motor lever 18. Mode door motor bracket
19. Main link 20. Ventilator door link 21 Ventilator door lever
22. Defroster lever
JMIIA0646ZZ
Revision: 2010 May2011 QX56

DOOR MOTORHAC-153
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONING]
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MODE DOOR MOTOR
MODE DOOR MOTOR : Re moval and InstallationINFOID:0000000006276009
REMOVAL
1. Remove instrument lower panel RH. Refer to IP-14, "Removal and Installation".
2. Remove power steering control unit bracket.
3. Remove fixing screws (A), and then remove mode door motor (1).
4. Disconnect mode door motor connector.
INSTALLATION
Install in the reverse order of removal.
AIR MIX DOOR MOTOR
AIR MIX DOOR MOTOR : Re moval and InstallationINFOID:0000000006276010
REMOVAL
Driver side
1. Remove automatic drive position control unit. Refer to ADP-136, "Removal and Installation".
2. Remove fixing screws (A), and then remove air door motor LH (1).
3. Disconnect air mix door motor connector.
Passenger side
1. Remove heater core. Refer to HA-44, "HEATER CORE : Removal and Installation".
2. Remove fixing screws, and then remove air mix door motor RH.
INSTALLATION
Install in the reverse order of removal.
INTAKE DOOR MOTOR
INTAKE DOOR MOTOR : Re moval and InstallationINFOID:0000000006276011
REMOVAL
1. Remove blower unit assembly. Refer to VTL-15, "Removal and Installation".
2. Remove fixing screws, and then remove intake door motor.
1. Rear A/C unit assembly 2. Rear mode door lever 2 3. Rear mode door lever 1
4. Rear mode door motor 5. Rear air mix door motor
JMIIA0790ZZ
JMIIA0788ZZ
Revision: 2010 May2011 QX56

HAC-154
< REMOVAL AND INSTALLATION >[AUTOMATIC AIR CONDITIONING]
DOOR MOTOR
3. Disconnect intake door motor connector.
INSTALLATION
Install in the reverse order of removal.
UPPER VENTILATOR DOOR MOTOR
UPPER VENTILATOR DOOR MOTO
R : Removal and InstallationINFOID:0000000006276012
REMOVAL
1. Remove automatic drive position control unit. Refer to ADP-136, "Removal and Installation".
2. Remove fixing screws (A), and then remove intake door motor (1).
3. Disconnect intake door motor connector.
INSTALLATION
Install in the reverse order of removal.
REAR MODE DOOR MOTOR
REAR MODE DOOR MOTOR : Removal and InstallationINFOID:0000000006276013
REMOVAL
1. Remove luggage side lower finisher RH. Refer to INT-36, "LUGGAGE SIDE LOWER FINISHER :
Removal and Installation".
2. Remove fixing screws, and then remove rear mode door motor.
INSTALLATION
Install in the reverse order of removal.
REAR AIR MIX DOOR MOTOR
REAR AIR MIX DOOR MOTOR : Removal and InstallationINFOID:0000000006276014
REMOVAL
1. Remove rear A/C unit assembly. Refer to HA-47, "REAR A/C UNIT ASSEMBLY : Removal and Installa-
tion".
2. Remove fixing screws, and then remove air mix door motor.
INSTALLATION
Install in the reverse order of removal.
JMIIA0789ZZ
Revision: 2010 May2011 QX56

IONIZER
HAC-155
< REMOVAL AND INSTALLATION > [AUTOMATIC AIR CONDITIONING]
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IONIZER
Exploded ViewINFOID:0000000006276015
Refer to HA-41, "Exploded View".
Removal and InstallationINFOID:0000000006276016
Removal
1. Remove instrument lower panel LH. Refer to IP-14, "Removal and Installation".
2. Remove mounting screws, and then remove ionizer from A/C unit assembly. CAUTION:
Never tough the surface (ceramic part) of th e ionizer. It is the discharge electrode.
3. Disconnect ionizer harness connector.
INSTALLATION
Note the following item, install in the reverse order of removal.
CAUTION:
If there is dirt, use a clean clot h and clean the discharge electrode (ceramic part) of the ionizer.
Revision: 2010 May2011 QX56

MWI-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
METER SYSTEM
METER SYSTEM : Component Parts LocationINFOID:0000000006221690
1.IPDM E/R
Refer to
PCS-4, "Component Parts
Location". 2.
ECM
Refer to
EC-16, "
Component Parts
Location". 3. Washer level switch
4. Oil pressure switch
Refer to
EM-57, "
Exploded View".5. Ambient sensor 6. A/C auto amp.
Refer to
HAC-6, "
FRONT AUTO-
MATIC AIR CONDITIONING SYS-
TEM : Component Parts Location".
7. TCM
Refer to
TM-10, "
A/T CONTROL
SYSTEM : Componen t Parts Loca-
tion". 8.ABS actuator and electric unit (con-
trol unit)
Refer to
BRC-10, "
Component Parts
Location". 9.BCM
Refer to
BCS-4, "
BODY CONTROL
SYSTEM : Component Parts Loca-
tion".
10. Fuel level sensor unit 11. Trip computer switch 12. Combination meter
13. Trip reset and illumination control
switch 14. Parking brake switch
A. Under of left side second seat
JSNIA3157ZZ
Revision: 2010 May2011 QX56

C1801 VHCL HEIGHT SENSORSCS-69
< DTC/CIRCUIT DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
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DTC/CIRCUIT DIAGNOSIS
C1801 VHCL HEIGHT SENSOR
DTC LogicINFOID:0000000006256062
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Turn ignition switch ON and wait 60 seconds or more.
2. Perform “Self Diagnostic Results” in “E-SUS”.
Is
“C1801” detected ?
YES >> Go to SCS-69, "DiagnosisProcedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006256063
1.CHECK APPEARANCE
Visually check for malfunction of suspension components, installing malfunction, or deformation of vehicle
height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.CHECK POWER SUPPLY CIRCUIT (PART 1)
1. Disconnect vehicle height sensor connector.
2. Turn ignition switch ON. CAUTION:
Never start the engine.
3. Check voltage between vehicle height sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK POWER SUPPLY CIRCUIT (PART 2)
1. Turn ignition switch OFF.
2. Disconnect air levelizer control module connector.
DTC Display itemI Malfunction detected condition Possible cause
C1801 VHCL HEIGHT SENSOR Signal voltage of the vehicle height sensor remains 0.2
V or less or 4.6 V or more continuously for 60 seconds
during sensor voltage (4.5 – 5.5 V) output by the air lev-
elizer control module.  Harness or connectors
(Sensor circuit is open.)
 Vehicle height sensor
 Air levelizer control module
 Rear suspension component parts
Vehicle height sensor —Voltage
Connector Terminal
C13 1 Ground 4.5 – 5.5 V
Revision: 2010 May2011 QX56