2009 INFINITI QX56 air condition

DIAGNOSIS SYSTEM (BCM)HAC-21
< FUNCTION DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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DIAGNOSIS SYSTEM (BCM)
CONSULT-III Function (BCM - COMMON ITEM)INFOID:0000000004335398
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with BCM.
SYSTEM APPLICATION
BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.
CONSULT-III Function (BCM - AUTO AIR CONDITIONER)INFOID:0000000004335399
DATA MONITOR
Diagnosis mode Function Description
WORK SUPPORT Changes the setting for each system function.
SELF-DIAG RESULTS Displays the diagnosis results judged by BCM. Refer to BCS-51, "
DTCIndex".
CAN DIAG SUPPORT MNTR Monitors the reception status of CAN communication viewed from BCM.
DATA MONITOR The BCM input/output signals are displayed.
ACTIVE TEST The signals used to activate each device are forcibly supplied from BCM.
ECU IDENTIFICATION The BCM pa rt number is displayed.
CONFIGURATION • Enables to read and save the vehicle specification.
• Enables to write the vehicle specification when replacing BCM.
System
Sub system selection item Diagnosis mode
WORK SUPPORT DATA MONITOR ACTIVE TEST
BCM BCM ×
Door lock DOOR LOCK ×××
Rear window defogger REAR DEFOGGER ×
Warning chime BUZZER ××
Interior room lamp timer INT LAMP ×××
Remote keyless entry system MULTI REMOTE ENT ××
Exterior lamp HEAD LAMP ×××
Wiper and washer WIPER ×××
Turn signal and hazard warning lamps FLASHER ××
Air conditioner AIR CONDITONER ×
Intelligent Key system INTELLIGENT KEY ×
Combination switch COMB SW ×
Immobilizer IMMU ××
Interior room lamp battery saver BATTERY SAVER ×××
Back door open TRUNK ××
RAP (retained accessory power) RETAINED PWR ×××
Signal buffer system SIGNAL BUFFER ××
TPMS (tire pressure monitoring sys-
tem) AIR PRESSURE MONITOR
×××
Vehicle security system PANIC ALARM ×
Revision: December 20092009 QX56

HAC-22
< FUNCTION DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (BCM)
Monitor Item
[Unit] Contents
IGN ON SW [ON/OFF] Display [ignition switch position (On)/(Off), ACC position (Off)] status as judged from ignition
switch signal
FAN ON SIG [ON/OFF] Display [FAN (On)/FAN (Off)] st atus as judged form blower fan motor switch signal
AIR COND SW [ON/OFF] Display [COMP (On)/COMP (Off)] status as judged form air conditioner switch signal
Revision: December 20092009 QX56

SELF-DIAGNOSIS FUNCTIONHAC-23
< FUNCTION DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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SELF-DIAGNOSIS FUNCTION
A/C Auto Amp. Self-DiagnosisINFOID:0000000003775340
A/C SYSTEM SELF-DI AGNOSIS FUNCTION
The self-diagnosis function is built into the A/C auto amp. to quickly locate the cause of malfunctions.
DESCRIPTION
The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on A/C auto amp. Refer to
applicable sections (items) for details. Fault codes (if any are present) will be displayed in the ambient temper-
ature display area. Refer to HAC-24, "
A/C System Self-Diagnosis Code Chart".
SELF-DIAGNOSTIC MODE
NOTE:
Radio must be off.
1. On the A/C and AV switch assembly, press the "SETTING" but- ton and twist the volume knob clockwise and counterclockwise
until the Self-Diagnosis screen shows on the display.
2. Scroll down to "Confirmation/Adjustment" and press the "ENTER" button.
3. Scroll down to "Climate Control" and press the "ENTER" button.
4. The fan bars will flash on the display during the self-test, and then the fault codes will display in the ambient temperature area.
They will continue scrolling until diagnostic mode is exited.
5. Exit by pressing the "BACK" button on A/C and AV switch assembly until display returns to its normal operation screen.
HVAC system will be OFF.
The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on A/C auto amp. Refer to
applicable sections (items) for details. Fault codes (if any are present) will be displayed in the ambient temper-
ature display area. Refer to HAC-24, "
A/C System Self-Diagnosis Code Chart".
A/C and AV Switch A ssembly Self-DiagnosisINFOID:0000000003775341
A/C and AV switch assembly self-diagnosis function
The ON/OFF operation (continuity) of each switch in the A/C and AV switch assembly can be checked.
Self-diagnosis mode
AWNIA0098ZZ
AWIIA0081ZZ
Revision: December 20092009 QX56

HAC-24
< FUNCTION DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
SELF-DIAGNOSIS FUNCTION
• Press the “BACK” switch and the “UP” switch within 10 seconds
after turning the ignition switch from OFF to ACC and hold them for
3 seconds or more. Then the buzzer sounds, all indicators of the
preset switch illuminate, and the self-diagnosis mode starts.
• The continuity of each switch and control dials (A/C and AV switch assembly only) at the ON position can be checked by pressing
each switch and turning each control dial. The buzzer sounds and
LED’s will illuminate if the switch is normal.
Finishing self-diagnosis mode
Self-diagnosis mode is canceled when turning the ignition switch OFF.
A/C System Self-Dia gnosis Code ChartINFOID:0000000003775342
SELF-DIAGNOSTIC CODE CHART
AWIIA0171GB
Code No. Reference page
03 Battery voltage out of range CHG-9, "
Inspection Procedure"
30 In-vehicle sensor circuit out of range (low)
HAC-82, "In-Vehicle Sensor Diagnosis Procedure"31 In-vehicle sensor circuit out of range (high)
40 Ambient sensor circuit shortHAC-79, "
Ambient Sensor Diagnosis Procedure"41 Ambient sensor circuit open
50 Optical sensor (Driver) circuit open or shortHAC-85, "
Optical Sensor Diagnosis Procedure"52 Optical sensor (Passenger) circuit open or short
56 Intake sensor circuit shortHAC-87, "
Intake Sensor Diagnosis Procedure"57 Intake sensor circuit open
80 CAN bus faultLAN-14, "
Trouble Diagnosis Flow Chart"
Revision: December 20092009 QX56

MODE DOOR MOTORHAC-25
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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COMPONENT DIAGNOSIS
MODE DOOR MOTOR
System DescriptionINFOID:0000000003775343
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• A/C auto amp.
• A/C and AV switch assembly
• Mode door motor (front)
• PBR (built into mode door motor)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The mode door position (vent, B/L, foot, D/F, and defrost) is set by the A/ C auto amp. by means of the mode
door motor (front). When a mode door position is sele cted on the A/C auto amp., voltage is applied to one cir-
cuit of the mode door motor (front) while ground is appli ed to the other circuit, causing the mode door motor
(front) to rotate. The direction of rotation is determined by which circuit has voltage applied to it, and which one
has ground applied to it. The A/C auto amp. monitors the mode door position by measuring the voltage signal
on the PBR circuit.
In AUTO mode the mode door position is set by the A/C auto amp. which determines the proper position
based on inputs from the in-vehicle sens or, ambient sensor, optical sensor, intake sensor, and the temperature
selected by the driver or passenger.
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor (Front)
AWIIA0092GB
AWIIA0093GB
Revision: December 20092009 QX56

HAC-26
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
The mode door motor (front) is attached to the heater & cooling unit
assembly. It rotates so that air is discharged from the outlet as indi-
cated by the A/C auto amp. Motor rotation is conveyed to a link
which activates the mode door.
Mode Door Motor (Front)
Component Function CheckINFOID:0000000003775344
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OP ERATIONAL CHECK - DISCHARGE AIR
1. Press mode switch four times and then press the (DEF) switch. Each position indicator should change shape (on display).
2. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-16, "
Discharge
Air Flow (Front)".
NOTE:
Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when DEF ( ) or D/F ( ) is selected.
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 MODE DOOR OPERATION
Check and verify mode door mechanism for smooth operation in each mode.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair as necessary.
5.PERFORM A/C AUTO AMP. SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to HAC-23, "
A/C Auto Amp. Self-Diagnosis".
Are any self-diagnosis codes present?
YES >> Refer to HAC-24, "A/C System Self-Diagnosis Code Chart".
NO >> GO TO 6.
6.PERFORM A/C AND AV SWITCH ASSEMBLY SELF-DIAGNOSIS
Perform self-diagnosis to check the A/C and AV switch assembly. Refer to HAC-23, "
A/C and AV Switch
Assembly Self-Diagnosis".
Is the inspection result normal?
YES >> Replace A/C and AV switch assembly. Refer to VTL-7, "Removal and Installation".
NO >> GO TO 7.
WJIA0587E
Revision: December 20092009 QX56

MODE DOOR MOTORHAC-27
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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7.CHECK THE MODE DOOR MOTOR (FRONT) PBR CIRCUIT
Perform diagnostic procedure for the mode door motor (front). Refer to HAC-26, "
Mode Door Motor (Front)
Component Function Check".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair PBR circuit or replace motor. Refer to HAC-27, "
Mode Door Motor (Front) Diagnosis Pro-
cedure".
8.RECHECK FOR CODES
Perform A/C auto amp. self-diagnosis. Refer to HAC-23, "
A/C Auto Amp. Self-Diagnosis".
Are any self-diagnostic codes present?
YES >> Refer to HAC-24, "A/C System Self-Diagnosis Code Chart".
NO >> GO TO 9.
9.RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to HAC-4, "
Operational Check
(Front)".
Does another symptom exist?
YES >> Repair as necessary.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
Mode Door Motor (Front) Diagnosis ProcedureINFOID:0000000003775345
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
1.CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Press the mode switch to the B/L ( ) mode.
3. Check voltage between A/C auto amp. harness connector M49 terminal 19 and terminal 20 while pressing the mode switch to
the floor ( ) mode.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 19, 20 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and
Installation".
ConnectorTe r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 20
19Press
mode
switch Battery
voltage
AWIIA0095ZZ
19 - Ground : Continuity should not exist.
20 - Ground : Continuity should not exist.
AWIIA0096ZZ
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HAC-28
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
NO >> Repair or replace harness as necessary.
3.CHECK A/C AUTO AMP. FOR GROUND AND POWER
1. Press the mode switch to the D/F ( ) mode.
2. Check voltage between A/C auto amp. harness connector M49 terminal 19 and terminal 20 while pressing the mode switch to
the vent ( ) mode.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
4.CHECK MODE DOOR MOTOR AND CIRCUITS FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M49 terminal 19 and terminal 20.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN
1. Disconnect the mode door motor harness connector.
2. Check continuity between A/C auto amp. harness connector M49 (A) terminal 19, 20 and the mode door motor harness con-
nector M142 (B) terminal 5, 6.
Is the inspection result normal?
YES >> Replace mode door motor. Refer to VTL-24, "Removal
and Installation".
NO >> Repair or replace harness as necessary.
6.CHECK A/C AUTO AMP. FOR PBR POWER AND GROUND
1. Reconnect A/C auto am p. harness connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M50 (A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 7.
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M49 19 20 Press
mode
switch Battery
voltage
AWIIA0097ZZ
Continuity should exist.
AWIIA0098ZZ
5 - 19 : Continuity should exist.
6 - 20 : Continuity should exist.
AWIIA0094ZZ
Connector Te r m i n a l s
Voltage (Ap-
prox.)
(+) (-)
A/C auto amp.: M49, M50 28 35V
AWIIA0099ZZ
Revision: December 20092009 QX56