2009 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2009 Factory Service Manual HAC-88
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INTAKE SENSOR
3.CHECK INTAKE SENSOR
Check intake sensor. Refer to HAC-88, "
Intake Sensor Component Inspection".
Is the inspection result nor

Page 2402 of 4171

INFINITI QX56 2009 Factory Service Manual POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-89
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
Component De

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-89
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
Component DescriptionINFOID:0000000003775385
COMPONENT DESCRIPTION
A/C auto amp.
The A/C auto amp. has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motors, mode door motor, intake door
motor, defroster door motor, blower motor and compressor are then
controlled.
The A/C auto amp. is unitized with control mechanisms. When the
various switches and temperature dials are operated, data is input to
the A/C auto amp.
Self-diagnostic functions are also bu ilt into the A/C auto amp. to pro-
vide quick check of malfunctions in the auto air conditioner system.
Potentio Temperature Control (PTC)
There are two PTCs (driver and passenger) built into the A/C auto
amp. They can be set at an interval of 0.5 °C (1.0 °F) in the 18° C
(60 °F) to 32 °C (90° F) temperature range by rotating the temperature
dial. The set temperature is displayed.
A/C Auto Amp. Com ponent Function CheckINFOID:0000000003775386
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE
1. Press AUTO switch.
2. Display should indicate AUTO. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower speed will depend on ambient, in-vehicle and set temperatures.)
Can a symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to HAC-4, "
Operational Check
(Front)".
Can a symptom be duplicated?
YES >> Refer to HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK POWER AND GROUND CIRCUIT
AWIIA0573ZZ
AWIIA0211GB
Revision: December 20092009 QX56

Page 2403 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-90
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
POWER SUPPLY AND GROUND
CIRCUIT FOR CONTROLLER
Check main power supply and ground circuit. Refer to HAC-90, "A/C Auto Amp Power and Ground D

Page 2404 of 4171

INFINITI QX56 2009 Factory Service Manual AIR CONDITIONER CONTROLHAC-91
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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ECU DIAGNOSIS
AIR CONDITIONER CONTROL
A/C Auto Amp. Terminals Reference ValuesINFOID:00000

Page 2405 of 4171

INFINITI QX56 2009 Factory Service Manual HAC-92
< ECU DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
14 G/W Air mix door motor (passenger) CW ON Clockwise rotation
Battery voltage
15 Y/G Power supply for IGN ON- Battery volta

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INFINITI QX56 2009 Factory Service Manual AIR CONDITIONER CONTROLHAC-93
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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Wiring DiagramINFOID:0000000003775389
ABIWA0010GB
Revision: December 20092009 QX56

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INFINITI QX56 2009 Factory Service Manual HAC-94
< ECU DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
ABIWA0011GB
Revision: December 20092009 QX56

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INFINITI QX56 2009 Factory Service Manual AIR CONDITIONER CONTROLHAC-95
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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ABIWA0012GB
Revision: December 20092009 QX56

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