2011 INFINITI QX56 lock

HAC-70
< BASIC INSPECTION >[AUTOMATIC AIR CONDITIONING]
SYSTEM SETTING
If the temperature felt by the customer is different from
the rear air flow temperature controlled by the temper-
ature setting, the A/C auto amp. control temperature can be adjusted to compensate for the temperature set-
ting.
HOW TO SET
With CONSULT-III
Perform “REAR TEMP SET CORRECT” of HVAC work support item.
NOTE:
 When −3.0 °C ( −6 °F) is corrected on the temperature setting set as 25.0 °C (77 °F) the temperature controlled
by A/C auto amp. is 25.0 °C (77 °F) −3.0 °C ( −6 °F) = 22.0 °C (72 °F) and the temperature becomes lower than
the temperature setting.
 When the battery cable is disconnected from the negativ e terminal or when the battery voltage becomes 10
V or less, the setting of the difference between t he set temperature and control temperature may be can-
celled.
ACCS (ADVANCED CLIM ATE CONTROL SYSTEM)
ACCS (ADVANCED CLIMATE CONTROL SYSTE M) : Exhaust Gas / Outside Odor
Detecting Sensor Sensitiv ity Adjustment Function
INFOID:0000000006275901
DESCRIPTION
According to customer’s sense of smell, exhaust gas / outside odor detecting sensor sensitivity can be
changed.
HOW TO SET
With CONSULT-III
Perform the “GAS SENSOR ADJUSTME NT” of HVAC work support item.
NOTE:
When the battery cable is disconnected from the negativ e terminal or when the battery voltage becomes 10 V
or less, the setting of WORK SUPPORT may be cancelled.
ACCS (ADVANCED CLIMATE CONTROL SYSTEM) : Auto Intake Switch Interlocking
Work support items Display ( °C) Display ( °F)
REAR TEMP SET CORRECT 3.0 6
2.5 5
2.0 4
1.5 3
1.0 2
0.5 1
0 (initial status) 0 (initial status) −0.5 −1
− 1.0 −2
− 1.5 −3
− 2.0 −4
− 2.5 −5
− 3.0 −6
Work support items Display Setting
GAS SENSOR ADJUSTMENT 2 Less sensitive setting than display 1 (REC later than display 1.)
1 Less sensitive setting than normal setting (REC later than normal operation.)
0 (initial status) Normal −1 More sensitive setting than normal setting (REC earlier than normal operation.)
− 2 More sensitive setting than display −1 (REC earlier than display −1.)
Revision: 2010 May2011 QX56

SYSTEM SETTINGHAC-71
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONING]
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Movement Change FunctionINFOID:0000000006275902
DESCRIPTION
Condition for interlocking movement of auto intake switch and A/C switch can be changed. In addition opera-
tion of the auto intake switch, which activates the aut omatic intake control (exhaust gas / outside odor detect-
ing mechanism), can be set to become available when the A/C switch is ON.
HOW TO SET
With CONSULT-III
Perform the “CLEAN SW SET” of HVAC work support item.
NOTE:
When the battery cable is disconnect ed from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of WO RK SUPPORT may be cancelled.
Work support items Display Setting
CLEAN SW SET Mode1 Initial setting
Mode2 Setting 1
Mode3 Setting 2
Mode4 Setting 3
Initial setting
When the auto intake switch is ON, the A/C switch is al
so turned ON in synchronization with the auto intake
switch.
Control of the auto intake switch is function al even when the A/C switch is turned OFF.
Setting 1 When the auto intake switch is ON, the A/C switch is
not turned ON in synchronization with the auto intake
switch.
Control of the auto intake switch is function al even when the A/C switch is turned OFF.
Setting 2 When the auto intake switch is ON, the A/C switch is al
so turned ON in synchronization with the auto intake
switch.
When the A/C switch is turned OFF, the auto intake switch is turned OFF in synchronization with the A/C
switch.
Setting 3 Auto intake switch can be turned ON only when A/C switch is ON.
When the A/C switch is turned OFF, the auto intake switch is turned OFF in synchronization with the A/C
switch.
Revision: 2010 May2011 QX56

B262A, B262B, B2657, B2658 EXHAUST GAS/OUTSIDE ODOR DETECTING
SENSOR
HAC-83
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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B262A, B262B, B2657, B2658 EXHAU ST GAS/OUTSIDE ODOR DETECT-
ING SENSOR
DTC LogicINFOID:0000000006275918
DTC DETECTION LOGIC
NOTE:
 If DTC is displayed along with DTC U1000, first per form the trouble diagnosis for DTC U1000. Refer to HAC-
72, "DTC Logic".
 If DTC is displayed along with DTC U1010, fi rst perform the trouble diagnosis for DTC U1010. HAC-73,
"DTC 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-83, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006275919
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 10A fuse [No.4, lo cated in fuse block (J/B)]
NOTE:
Refer to PG-140, "
Fuse, Connector and Terminal Arrangement".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect exhaust gas / outside odor detecting sensor connector.
3. Turn ignition switch ON.
4. Check voltage between exhaust gas / outside odor detecting sensor harness and ground.
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
B262A GAS SENSOR Exhaust gas / outside odor detecting sensor
duty ratio 15% or less.
 Exhaust gas / outside odor detect-
ing sensor
 A/C auto amp.
 Harness or connectors (The sensor circuit is open or short-
ed.)
B262B
Exhaust gas / outside odor detecting sensor
duty ratio 85% or more.
B2657 CAS SENSOR CIRCUIT Exhaust gas / outside odor detecting sensor
duty ratio 0%.
B2658 Exhaust gas / outside odor detecting sensor
duty ratio 100%.
+
−Vol tag e
(Approx.)
Exhaust gas / outside odor detect-
ing sensor
Connector Terminal E117 1 Ground Battery voltage
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

HAC-110
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
A/C AUTO AMP.
A/C AUTO AMP. : Diagnosis ProcedureINFOID:0000000006275948
1.CHECK FUSE
Check 10A fuse [No. 9, 19, and 4, located in the fuse block (J/B)].
NOTE:
Refer to PG-140, "
Fuse, Connector and Terminal Arrangement".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK A/C AUTO AMP. POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check voltage between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector between A/C auto amp. and fuse block (J/B).
3.CHECK A/C AUTO AMP. GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair harness or connector.
FRONT AIR MIX DOOR MOTOR (DRIVER SIDE)
FRONT AIR MIX DOOR MOTOR (DRI VER SIDE) : Diagnosis ProcedureINFOID:0000000006275949
1.CHECK FRONT AIR MIX DOOR MOTO R (DRIVER SIDE) POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between front air mix door motor LH harness connector and ground.
+
− Vo l ta g e
A/C auto amp. Ignition switch position
Connector Terminal OFF ACC ON
M50 4
Ground Approx. 0 V Battery voltage Battery voltage
23 Approx. 0 V Approx. 0 V Battery voltage 3 Battery voltage Battery voltage Battery voltage
A/C auto amp. —Continuity
Connector Terminal
M50 2
Ground Existed
22
37
Revision: 2010 May2011 QX56

POWER SUPPLY AND GROUND CIRCUITHAC-115
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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Is the inspection result normal?
YES >> Replace rear air mix door motor. Refer to HAC-154, "REAR AIR MIX DOOR MOTOR : Removal
and Installation".
NO >> Repair or replace malfunctioning part.
4.CHECK REAR AIR MIX DOOR MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear air mix door motor connector and A/C auto amp. connector.
3. Check continuity between rear air mix door mo tor harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
REAR A/C CONTROL
REAR A/C CONTROL : Diagnosis ProcedureINFOID:0000000006275954
1.CHECK FUSE
Check 10A fuse [No. 4, locat ed in the fuse block (J/B)].
NOTE:
Refer to PG-140, "
Fuse, Connector and Terminal Arrangement".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK REAR A/C CONTROL POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect rear A/C control connector.
3. Turn ignition switch ON.
4. Check voltage between rear A/C control harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector between r ear A/C control and fuse block (J/B).
3.CHECK REAR A/C CONTROL GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear A/ C control harness connector and ground.
Is the inspection result normal?
YES >> Replace rear A/C control. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
Rear air mix door motor A/C auto amp. Continuity
Connector Terminal Connector Terminal
B210 1 M50 17 Existed
+ −Voltage
Rear A/C control
Connector Terminal M41 12 Ground Battery voltage
Rear A/C control —Continuity
Connector Terminal
M41 1 Ground Existed
Revision: 2010 May2011 QX56

FRONT BLOWER MOTORHAC-121
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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FRONT BLOWER MOTOR
Diagnosis ProcedureINFOID:0000000006275968
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 15A fuse [No. 21 and 22, located in fuse block (J/B)]. NOTE:
Refer to PG-140, "
Fuse, Connector and Terminal Arrangement".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK FRONT BLOWER MOTOR POWER SUPPLY
1. Disconnect front blower motor connector.
2. Turn ignition switch ON.
3. Check voltage between front blower motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 6.
3.CHECK FRONT BLOWER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between front blower motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK FRONT BLOWER MOTOR CONTROL SIGNAL CIRCUIT
1. Disconnect A/C auto amp. connector.
2. Check continuity between front blower motor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair the harness or connector.
5.CHECK FRONT BLOWER MOTOR CONTROL SIGNAL
1. Reconnect front blower motor connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Operate MODE switch to set air outlet to VENT.
4. Change fan speed from Lo to Hi, and check duty rati os between front blower motor harness connector
and ground by using an oscilloscope.
+
−Vol tag e
Front blower motor
Connector Terminal M272 1 Ground Battery voltage
Front blower motor —Continuity
Connector Terminal
M272 3 Ground Existed
Front blower motor A/C auto amp. Continuity
Connector Terminal Connector Terminal
M272 2 M50 14 Existed
Revision: 2010 May2011 QX56

HAC-122
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
FRONT BLOWER MOTOR
NOTE:
Calculate drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms
Is the inspection result normal?
YES >> Replace front blower motor. Refer to VTL-16, "FRONT A/C UNIT : Removal and Installation".
NO >> Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
6.CHECK BLOWER RELAY GROUND CIRCUIT
Check continuity between fuse bl ock (J/B) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair harness or connector.
7.CHECK BLOWER RELAY
Check blower relay. Refer to HAC-123, "
Component Inspection (Blower Relay)".
Is the inspection result normal?
YES >> Repair harness or connector between front blower motor and fuse block (J/B).
NO >> Replace blower relay.
Component Inspection (Front Blower Motor)INFOID:0000000006275969
1.CHECK FRONT BLOWER MOTOR-I
1. Remove front blower motor.
2. Check that there is not any mixing foreign object in the front blower motor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace front blower motor. Refer to VTL-16, "
FRONT A/C UNIT : Removal and Installation".
2.CHECK FRONT BLOWER MOTOR-II
Check that there is not breakage or damage in the front blower motor.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace front blower motor. Refer to VTL-16, "
FRONT A/C UNIT : Removal and Installation".
3.CHECK FRONT BLOWER MOTOR-III
Check that front blower motor turns smoothly.
Is the inspection result normal?
YES >> INSPECTION END
Front blower motor Condition Duty ratio
(Approx.)
Connector Terminal Fan speed (manual)
VENT mode
M272 2 1st 25 %
2nd 33 % 3rd 41 %4th 51 %
5th 61 %
6th 69 %
7th 81 %
JPLIA1210GB
Fuse block (J/B) —Continuity
Connector Terminal
M3 7C Ground Existed
Revision: 2010 May2011 QX56