2011 INFINITI QX56 turn signal

SYSTEMHAC-17
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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FRONT AUTOMATIC AIR CONDITIONIN G SYSTEM : Air Outlet ControlINFOID:0000000006275864
 While air outlet is in automatic control, A/C auto amp. selects the
front mode door position depending on a target front air mix door
angle and outlet air temperature calculated from sunload.
 If ambient temperature is excessively low, D/F is selected to pre- vent windshield fogging when air outlet is set to FOOT.
FRONT AUTOMATIC AIR CONDITIONIN G SYSTEM : Compressor Control
INFOID:0000000006275865
DESCRIPTION
 When the compressor activation condition is satisfied while blower motor is activated, A/C auto amp. trans-
mits A/C ON signal and blower fan ON signal to ECM via CAN communication.
 ECM judges that the compressor can be activated depending on each sensors state (refrigerant pressure sensor signal, and others). And transmits A/C compress or request signal to IPDM E/R via CAN communica-
tion.
 IPDM E/R turns A/C relay ON and activates the compressor depending on request from ECM.
COMPRESSOR PROTECTION CONTROL AT PRESSURE MALFUNCTION
When high-pressure side value that is detected by refri gerant pressure sensor is as per the following state,
ECM requests IPDM E/R to turn A/C relay OFF and stops the compressor.
 3.12 MPa (31.82 kg/cm
2, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
 2.74 MPa (27.95 kg/cm
2, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
 0.14 MPa (1.43 kg/cm
2, 20.3 psi) or less
COMPRESSOR OIL CIRCULATION CONTROL
When the engine starts while the engine coolant temperature is 56 °C (133 °F) or less, ECM activates the com-
pressor for approximately 6 seconds and circulates the compressor lubricant once.
LOW TEMPERATURE PROTECTION CONTROL
 When intake sensor detects that front evaporator fin temperature is
2.5 °C (37 °F) or less, A/C auto amp. requests ECM to turn com-
pressor OFF, and stops the compressor.
 When the front evaporator fin temperature returns to 5.0 °C (41 °F)
or more, the compressor is activated.
OPERATING RATE CONTROL
When set temperature is other than fully cold or air out let is “VENT”, “B/L” or “FOOT” A/C auto amp. controls
the compressor activation depending on ambient temperature.
AIR CONDITIONING CUT CONTROL
When set engine is running is excessively high load conditi on, ECM requests IPDM E/R to turn A/C relay OFF,
and stops the compressor. Refer to EC-47, "
AIR CONDITIONING CUT CONTRO L : System Description" for
details.
JMIIA0730GB
JMIIA0742GB
Revision: 2010 May2011 QX56

HAC-28
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
SYSTEM
ACCS (ADVANCED CLIMATE CONT ROL SYSTEM) : System Diagram
INFOID:0000000006275875
ACCS (ADVANCED CLIMATE CONTROL SYSTEM) : System DescriptionINFOID:0000000006275876
 ACCS (advanced climate control system) controls pass enger room air. It maintains the cleanliness of the
passenger room air using an in-cabin microfilter and a combination of each of the following functions.
- HAC-28, "
ACCS (ADVANCED CLIMATE CONT ROL SYSTEM) : Automatic Intake Control (Exhaust Gas /
Outside Odor Detecting Mechanism)"
-HAC-29, "ACCS (ADVANCED CLIMATE CONTROL SYSTEM) : Plasmacluster Control"
NOTE:
 Plasmacluster
™ ion technology developed by Sharp Corporation is installed in this item.
 Plasmacluster
™ is a trademark of Sharp Corporation.
 Various operations of ACCS (advanced climate contro l system) are transmitted from preset switch to AV
control unit via communication line and from AV contro l unit to A/C auto amp. via CAN communication. A/C
auto amp. sends each indication information to AV c ontrol unit via CAN communication. AV control unit dis-
plays each indication information that is received.
ACCS (ADVANCED CLIMATE CONTROL SYSTE M) : Automatic Intake Control (Ex-
haust Gas / Outside Odor Detecting Mechanism)
INFOID:0000000006275877
DESCRIPTION
In addition to air inlet automatic control of front automatic air conditioning system, A/C auto amp. controls
automatically air inlet according to signal from ex haust gas / outside odor detecting sensor, so that unpleasant
outside odor does not enter in passenger room.
OPERATION DESCRIPTION
 When pressing auto intake switch while front blower motor is operated and DEF switch is OFF, auto intake switch indicator lamp and intake switch indicator lamp turn ON. Air inlet is fixed to recirculation for approxi-
mately 5 minutes, and then is switched to automatic intake control (exhaust gas / outside odor detecting
mechanism).
 Air inlet switches to recirculation when exhaust gas or outside odor is detected while automatic intake control
(exhaust gas / outside odor detecting mechanism) is operated. After that, air inlet switches to fresh air intake
when exhaust gas or outside odor becomes not detectable.
NOTE:
JMIIA0819GB
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (HVAC)HAC-39
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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DIAGNOSIS SYSTEM (HVAC)
DescriptionINFOID:0000000006275884
Air conditioning system performs self-diagnosis, operat ion check, function diagnosis, and various settings
using diagnosis function of each control unit.
CONSULT-III FunctionINFOID:0000000006275885
CONSULT-III performs the following functions via CAN communication with A/C auto amp.
NOTE:
Diagnosis should be performed with engine running. D oor motor operation speeds become slower and NO
results may be returned even for normal operation if battery voltage drops below 12 V during self-diagnosis.
SELF-DIAGNOSIS RESULTS
Refer to HAC-45, "DTC Index".
DATA MONITOR
Display item list
ECU Diagnostic item
(CONSULT-III)
A/C auto amp. HVACSelf Diagnostic Result
Data Monitor
Active Test
Work support
AV c o n t r o l u n i t MULTI AV
Self Diagnostic Result
Multi AV system on board diagnosis function
ECM ENGINESelf Diagnostic Result
Data Monitor
IPDM E/R IPDM E/RSelf Diagnostic Result
Data Monitor
Auto active test
Diagnostic mode Description
Self diagnostic result Displays the diagnosis results judged by A/C auto amp.
Data monitor Displays the input/output signal of A/C auto amp.
Active test The signals used to activate each device are forcibly supplied from A/C auto amp.
Work support Changes the setting for each setting function.
ECU identification Displays the part number of A/C auto amp.
Monitor item [Unit] Description
AMB TEMP SEN [ °C ( °F)] Ambient sensor value converted from ambient sensor signal received from ambient sen-
sor
IN-VEH TEMP [ °C ( °F)] Front in-vehicle sensor value converted from front in-vehicle sensor signal received from
front in-vehicle sensor
INT TEMP SEN [ °C ( °F)] Intake sensor value converted from intake sensor signal received from intake sensor
SUNLOAD SEN [w/m
2]Sunload sensor value converted from sunload sensor signal (driver side) received from
sunload sensor
AMB SEN CAL [ °C ( °F)] Ambient temperature value calculated by A/C auto amp.
IN-VEH CAL [ °C ( °F)] In-vehicle temperature (front side) value calculated by A/C auto amp.
INT TEMP CAL [ °C ( °F)] Front evaporator fin temperature value calculated by A/C auto amp.
SUNL SEN CAL [w/m
2]Sunload value (driver side) calculated by A/C auto amp.
Revision: 2010 May2011 QX56

HAC-72
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
U1000 CAN COMM CIRCUIT
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006275903
CAN (Controller Area Network) is a serial communication
system for real time application. It is an on-vehicle
multiplex communication system with high data comm unication speed and excellent error detection ability.
Many electronic control units are equipped onto vehicl es, and each control unit shares information and links
with other control units during operation (not independent ). In CAN communication, control units are con-
nected with two communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission
with less wiring. Each control unit transmits/recei ves data but selectively reads required data only.
CAN Communication Signal Chart. Refer to LAN-28, "
CAN COMMUNICATION SYSTEM : CAN Communica-
tion Signal Chart".
DTC LogicINFOID:0000000006275904
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-.III
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-72, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006275905
1.CHECK CAN COMMUNICATION SYSTEM
Check CAN communication system. Refer to LAN-18, "
Trouble Diagnosis Flow Chart".
>> INSPECTION END
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
U1000 CAN COMM CIRCUIT When A/C auto amp. is not transmitting
or receiving CAN communication signal
for 2 or more seconds.
CAN communication system
Revision: 2010 May2011 QX56

HAC-84
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B262A, B262B, B2657, B2658 EX
HAUST GAS/OUTSIDE ODOR DETECTING
SENSOR
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector between exhaust gas / outside odor detecting sensor and fuse block
(J/B).
3.CHECK EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between exhaust gas / outsi de odor detecting sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR SIGNAL CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between exhaust gas / outside odor detecting sensor harness connector and ground.
Is the inspection result normal?
YES >> Replace exhaust gas / outside odor detecting sensor. Refer to HAC-151, "Removal and Installa-
tion".
NO >> GO TO 5.
5.CHECK EXHAUST GAS / OUTSIDE ODOR DETE CTING SENSOR SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp.connector.
3. Check continuity between exhaust gas / outside odor detecting sensor harness connector and A/C auto
amp. connector.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK EXHAUST GAS / OUTSIDE ODOR DETE CTING SENSOR SIGNAL CIRCUIT FOR GROUND
SHORT
Check continuity between exhaust gas / outside odor detecting sensor harness connector and ground.
Is the inspection result normal?
Exhaust gas / outside odor detect- ing sensor —Continuity
Connector Terminal
E117 2 Ground Existed
+
−Voltage
(Approx.)
Exhaust gas / outside odor detect-
ing sensor
Connector Terminal E117 3 Ground 5 V
Exhaust gas / outside odor detect- ing sensor A/C auto amp.
Continuity
Connector Terminal Connector Terminal
E117 3 M50 10 Existed
Exhaust gas / outside odor detect- ing sensor —Continuity
Connector Terminal
E117 3 Ground Not existed
Revision: 2010 May2011 QX56

B2632, B2633 FRONT AIR MIX DOOR MOTOR (DRIVER SIDE)
HAC-89
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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B2632, B2633 FRONT AIR MIX DO OR MOTOR (DRIVER SIDE)
DTC LogicINFOID:0000000006275923
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-III.
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-89, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006275924
1.CHECK FRONT AIR MIX DOOR MOTOR ( DRIVER SIDE) COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check output waveform between front air mix door motor LH harness connector and ground with the oscil-
loscope.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK INSTALLATION OF FRONT AI R MIX DOOR MOTOR (DRIVER SIDE)
Check front air mix door motor (driver side) is properly installed. Refer to HAC-152, "
Exploded View".
Is the inspection result normal?
YES >> Replace front air mix door motor (driver side). Refer to HAC-153, "AIR MIX DOOR MOTOR :
Removal and Installation".
NO >> Repair or replace malfunctioning part.
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
B2632
DR AIR MIX DOOR MOT Front air mix door motor (driver side)
PBR position 95% or more
 Front air mix door
motor (driver side)
(PBR internal circuit is open or short-
ed)
 Front air mix door motor (driver side)
installation condition
 A/C auto amp.
 Harness and connector (LIN communication line is open or
shorted)
B2633
Front air mix door motor (driver side)
PBR position 5% or less
+
−Output waveform
Front air mix door motor LH
Connector Terminal
M252 3 Ground
SJIA1453J
Revision: 2010 May2011 QX56

HAC-90
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B2632, B2633 FRONT AIR MIX
DOOR MOTOR (DRIVER SIDE)
3.CHECK FRONT AIR MIX DOOR MOTOR (DRIVE R SIDE) COMMUNICATION SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front air mix door motor LH and A/C auto amp. connector.
3. Check continuity between front air mix door moto r LH harness connector and A/C auto amp. harness con-
nector.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
Front air mix door motor LH A/C auto amp. Continuity
Connector Terminal Connector Terminal
M252 3 M50 16 Existed
Revision: 2010 May2011 QX56

B2634, B2635 FRONT AIR MIX DOOR MOTOR (PASSENGER SIDE)
HAC-91
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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B2634, B2635 FRONT AIR MIX DO OR MOTOR (PASSENGER SIDE)
DTC LogicINFOID:0000000006275925
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-III.
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-91, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006275926
1.CHECK FRONT AIR MIX DOOR MOTOR (P ASSENGER SIDE) COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check output waveform between front air mi x door motor RH harness connector and ground with the
oscilloscope.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK INSTALLATION OF FRONT AIR MIX DOOR MOTOR (PASSENGER SIDE)
Check front air mix door motor (passenger side) is properly installed. Refer to HAC-152, "
Exploded View".
Is the inspection result normal?
YES >> Replace front air mix door motor (passenger side). Refer to HAC-153, "AIR MIX DOOR MOTOR :
Removal and Installation".
DTCItems
(CONSULT-III screen terms) DTC detection condition Possible cause
B2634
PASS AIR MIX DOOR MOT Front air mix door motor (passenger
side) PBR position 95% or more
 Front air mix door motor (passenger
side)
(PBR internal circuit is open or short-
ed)
 Front air mix door motor (passenger side) installation condition
 A/C auto amp.
 Harness and connector
(LIN communication line is open or
shorted)
B2635
Front air mix door motor (passenger
side) PBR position 5% or less
+
−Output waveform
Front air mix door motor RH
Connector Terminal
M255 3 Ground
SJIA1453J
Revision: 2010 May2011 QX56