2011 INFINITI QX56 climate control

OPERATIONHAC-35
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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REAR AUTOMATIC AIR CONDITIONING SYSTEM
REAR AUTOMATIC AIR CONDITIONING SY STEM : Switch Name and Function
INFOID:0000000006275882
FRONT CONTOLLER OPERATION
A/C Display
 Rear air conditioning system state is indicated on the front display.
 When REAR switch is pressed while air conditioning syst em is in the ON position, the front display changes
to state indication display (rear contro l mode) of rear air conditioning system.
Display screen
Controller (Preset Switch)
With ACCS (advanced climate control system)
Temperature control dial
(passenger side)  Selects set temperature within a range between 18.0
°C (60 °F) – 32.0 °C (90 °F) at a rate of 0.5 °C
(1.0 °F) each time the dial is rotated.
- Clockwise rotation: Set temperature increases.
- Counterclockwise rotation: Set temperature decreases.
 When the temperature control dial is turned, DUAL switch indicator turns ON.
NOTE:
When front air conditioning system is in the OFF position, set temperature can be selected only while
front air conditioning system state (when MODE switch is pressed) is indicated on the display.
Upper ventilator switch Turns the upper ventila
tor control (switch indicator) between ON ⇔ OFF each time while front blower
fan is activated.
NOTE:
 When front air conditioning system is in the OFF position and air outlet is DEF position, upper ven- tilator control cannot be activated.
 When front air conditioning system is in the OFF position, upper ventilator control can be selected only while front air conditioning system state (when MODE switch is pressed) is indicated on the
display.
JMIIA0720ZZ
JMIIA0825ZZ
1. AUTO switch 2. Temperature control dial (Driver
side)3. MODE switch
4. REAR switch 5. OFF switch 6. Fan switch
Revision: 2010 May2011 QX56

HAC-36
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
OPERATION
Without ACCS (advanced
climate control system)
Switch Operation
REAR CONTROLLER OPERATION
Controller (Rear A/C Control)
JMIIA0824ZZ
1. AUTO switch 2. Temperature control dial (Driver
side)3. MODE switch
4. REAR switch 5. OFF switch 6. Fan switch
AUTO switch Turns the switch indicator lamp and "AUTO" indicator on the front display ON, and then rear air con-
ditioning system becomes the following state.
 Air outlet: Automatic control
 Blower fan: Automatic control
 Compressor: ON
Fan switch (UP/DOWN) Blower fan speed is manually controlled with these switches. Seven speeds are available for manual
control (as shown on the display screen)
NOTE:
When fan switch is pressed while air conditioning system is in automatic control (“AUTO” is indicated),
automatic control is rele
ased (“AUTO” turns OFF).
MODE switch Selects air outlet sequentially from VENT
⇒ B/L ⇒ FOOT ⇒ VENT each time.
NOTE:
When MODE switch is pressed while air conditioning system is in automatic control (“AUTO” is indi-
cated), automatic control is released (“AUTO” turns OFF).
OFF switch  Turns rear air conditioning system OFF. (When rear control mode is ON)
 When rear air conditioning system turns OFF, air outlet become the automatic control.
REAR switch  Turns the switch indicator lamp and rear control mode on the front display ON, and then rear air
conditioning system becomes the following state.
- Air outlet: Automatic control
- Blower fan: Automatic control
- Compressor: ON
 Rear control mode is released when switch is pressed again (rear air conditioning system operates continuously).
Temperature control dial
(driver side)  Selects set temperature within a range between 18.0
°C (60 °F) – 32.0 °C (90 °F) at a rate of 0.5 °C
(1.0 °F) each time the dial is rotated.
- Clockwise rotation: Set temperature increases.
- Counterclockwise rotation: Set temperature decreases.
Revision: 2010 May2011 QX56

OPERATIONHAC-37
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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Switch Operation
ACCS (ADVANCED CLIMATE CONTROL SYSTEM)
ACCS (ADVANCED CLIMATE CONTROL SY
STEM) : Switch Name and Function
INFOID:0000000006275883
OPERATION AND DISPLAY
Plasmacluster™ ion display
 Plasmacluster™ control state is indicated on the front display.
 Plasmacluster
™ ion display is switched as shown in the figure depending on air flow.
NOTE:
 Plasmacluster
™ ion technology developed by Sharp Corporation is installed in this item.
 Plasmacluster
™ is a trademark of Sharp Corporation.
1. OFF switch 2. Fan switch 3. Display
4. Temperature control switch 5. MODE switch 6. AUTO switch
JMIIA0718ZZ
AUTO switch Turns the switch indicator lamp and "AUTO" indicator on the display ON, and then rear air condition-
ing system becomes the following state.
 Air outlet: Automatic control
 Blower fan: Automatic control
 Compressor: ON
Fan switch (UP/DOWN) Blower fan speed is manually controlled with these switches. Seven speeds are available for manual
control (as shown on the display screen)
NOTE:
When fan switch is pressed while air conditioning system is in automatic control (“AUTO” is indicated),
automatic control is rele
ased (“AUTO” turns OFF).
MODE switch Selects air outlet sequentially from VENT
⇒ B/L ⇒ FOOT ⇒ VENT each time.
NOTE:
When MODE switch is pressed while air conditioning system is in automatic control (“AUTO” is indi-
cated), automatic control is released (“AUTO” turns OFF).
OFF switch  Turns rear air conditioning system OFF.
 When rear air conditioning system turns OFF, air outlet become the automatic control.
Temperature control
switch Setting temperature is selected using this switch with in a range between 18.0
°C (60 °F) – 32.0 °C
(90 °F) at a rate of 0.5 °C (1.0 °F) per adjustment.
 : Press: Set temperature increases.
 : Press: Set temperature decreases.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (HVAC)HAC-41
< SYSTEM DESCRIPTION > [AUTOMATIC AIR CONDITIONING]
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*: With ACCS (advanced climate control system)
NOTE:
Perform the inspection of each output device after starting the engine because the compressor is operated.
WORK SUPPORT
*: With ACCS (advanced climate control system)
NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of WORK SUPPORT may be cancelled.
Rear A/C relay ON ON ON ON OFF OFF ON
Ionizer
*ON ON ON ON ON ON OFF
Front display (Ion mode)
*CLEAN CLEAN QUICK
CLEAN QUICK
CLEAN QUICK
CLEAN QUICK
CLEAN OFF
Te s t i t e m
MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7
Work item Description Refer to
TEMP SET CORRECT Setting change of temperature setting trimmer (front) can be per-
formed. HAC-68, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM :
Temperature Setting Trim-
mer (Front)"
BLOWER SET Setting change of foot position setting trimmer can be performed.
HAC-68, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM : Foot
Position Setting Trimmer"
REC MEMORY SET
Setting change of inlet port memory function (REC) can be per-
formed. HAC-69, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM : Inlet Port
Memory Function (REC)"
FRE MEMORY SET
Setting change of inlet port memory function (FRE) can be per-
formed. HAC-69, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM : Inlet Port
Memory Function (FRE)"
GAS SENSOR ADJUSTMENT*Setting change of exhaust gas / outside odor detecting sensor sensi-
tivity adjustment function can be performed. HAC-70, "
ACCS (AD-
VANCED CLIMATE CON-
TROL SYSTEM) :
Exhaust Gas / Outside
Odor Detecting Sensor
Sensitivity Adjustment
Function"
CLEAN SW SET*Setting change of auto intake switch interlocking movement change
function can be performed.
HAC-70, "
ACCS (AD-
VANCED CLIMATE CON-
TROL SYSTEM) : Auto
Intake Switch Interlocking
Movement Change Func-
tion"
REAR TEMP SET CORRECT
Setting change of temperature setting trimmer (rear) can be per-
formed. HAC-68, "
FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM :
Temperature Setting Trim-
mer (Front)"
Revision: 2010 May2011 QX56

A/C AUTO AMP.HAC-45
< ECU DIAGNOSIS INFORMATION > [AUTOMATIC AIR CONDITIONING]
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*1: With ACCS (advanced climate control system)
*2: A/C auto amp. is not used for control.
Fail-safeINFOID:0000000006275887
FAIL-SAFE FUNCTION
If a communication error exists between the A/C auto am p., and the AV control unit and preset switch for 30
seconds or longer, air conditioning is controlled under the following conditions:
When ambient temperature is less than 3 °C (37 °F) and engine coolant temperature is less than 56 °C (133 °F)
When ambient temperature is 3 °C (37 °F) or more, or engine coolant temperature is 56 °C (133 °F) or more
DTC IndexINFOID:0000000006275888
34
(L/O) GroundRear blower motor control
signal Output Ignition switch ON
 Rear fan speed: 1st
speed (manual)
37
(B) —Ground — — —
38
(G/W) Ground Rear A/C relay control signal Output Ignition
switch
ONRear blower
motor: ON
0 V
Rear blower
motor: OFF 12 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ − Signal name Input/
Output
JSIIA0096ZZ
Compressor : ON
Air outlet : DEF
Air inlet : FRE (Fresh air intake)
Blower fan speed : AUTO
Set temperature : Setting before communication error occurs
Compressor : ON
Air outlet : AUTO
Air inlet : 20% FRE (20% fresh air intake)
Blower fan speed : AUTO
Set temperature : Setting before communication error occurs
DTC Items
(CONSULT-III screen terms) Reference
U1000 CAN COMM CIRCUIT HAC-72, "
DTC Logic"
U1010 CONTROL UNIT (CAN)HAC-73, "DTC Logic"
B2578 IN-VEHICLE SENSORHAC-74, "DTC Logic"
B2579 IN-VEHICLE SENSORHAC-74, "DTC Logic"
B257B AMBIENT SENOR HAC-77, "DTC Logic"
B257C AMBIENT SENOR HAC-77, "DTC Logic"
B2581 INTAKE SENSORHAC-80, "DTC Logic"
B2582 INTAKE SENSORHAC-80, "DTC Logic"
Revision: 2010 May2011 QX56

HAC-46
< ECU DIAGNOSIS INFORMATION >[AUTOMATIC AIR CONDITIONING]
A/C AUTO AMP.
*1: With ACCS (advanced climate control system)
*2: Perform self-diagnosis under sunshine. When performi
ng indoors, aim a light (more than 60 W) at sunload
sensor, otherwise self-diagnosis indicates even though the sunload sensor is functioning normally.
NOTE:
If all of door motor DTCs (B2632, B2633, B2634, B2635, B2636, B2637, B2638, B2639, B263D, B263E,
B263F, B2654, B2655, B2661, B2662, B2663, B2664, B 2665, B2666, B2669, and B266A) are detected, check
door motor communication circuit. Refer to HAC-120, "
Diagnosis Procedure".
B262A*1GAS SENSOR HAC-83, "DTC Logic"
B262B*1GAS SENSORHAC-83, "DTC Logic"
B2630*2SUNLOAD SENSORHAC-86, "DTC Logic"
B2631*2SUNLOAD SENSORHAC-86, "DTC Logic"
B2632 DR AIRMIX DOOR MOT HAC-89, "DTC Logic"
B2633 DR AIRMIX DOOR MOTHAC-89, "DTC Logic"
B2634 PASS AIR MIX DOOR MOTHAC-91, "DTC Logic"
B2635 PASS AIR MIX DOOR MOTHAC-91, "DTC Logic"
B2636 DR VENT DOOR FAILHAC-93, "DTC Logic"
B2637 DR B/L DOOR FAILHAC-93, "DTC Logic"
B2638 DR D/F1 DOOR FAILHAC-93, "DTC Logic"
B2639 DR DEF DOOR FAILHAC-93, "DTC Logic"
B263D FRE DOOR FAIL HAC-95, "DTC Logic"
B263E 20P FRE DOOR FAILHAC-95, "DTC Logic"
B263F REC DOOR FAILHAC-95, "DTC Logic"
B2654 D/F2 DOOR FAILHAC-93, "DTC Logic"
B2655 B/L2 DOOR FAILHAC-93, "DTC Logic"
B2657*1GAS SENSOR CIRCUITHAC-83, "DTC Logic"
B2658*1GAS SENSOR CIRCUITHAC-83, "DTC Logic"
B2661 UPPER VENT DOOR MOT HAC-97, "DTC Logic"
B2662 UPPER VENT DOOR MOTHAC-97, "DTC Logic"
B2663 UPPER VENT DOOR MOTHAC-97, "DTC Logic"
B2664 REAR AIR MIX DOOR MOTHAC-99, "DTC Logic"
B2665 REAR AIR MIX DOOR MOTHAC-99, "DTC Logic"
B2666 REAR MODE DOOR MOTHAC-101, "DTC Logic"
B2667*2PASS SUNLOAD SENSORHAC-103, "DTC Logic"
B2668*2PASS SUNLOAD SENSORHAC-103, "DTC Logic"
B2669 REAR MODE DOOR MOT HAC-101, "DTC Logic"
B266A REAR MODE DOOR MOT HAC-101, "DTC Logic"
B266B REAR IN-VEHICLE SENHAC-106, "DTC Logic"
B266C REAR IN-VEHICLE SEN HAC-106, "DTC Logic"
B27B0 A/C AUTO AMP.HAC-109, "DTC Logic"
DTCItems
(CONSULT-III screen terms) Reference
Revision: 2010 May2011 QX56

HAC-62
< BASIC INSPECTION >[AUTOMATIC AIR CONDITIONING]
OPERATION INSPECTION
OPERATION INSPECTION
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
FRONT AUTOMATIC AIR CONDITIONIN
G SYSTEM : Work ProcedureINFOID:0000000006275892
DESCRIPTION
The purpose of the operational check is to che ck that the individual system operates normally.
OPERATION INSPECTION
1.CHECK MEMORY FUNCTION
1. Set temperature control dial (driver side) to 32.0 °C (90 °F).
2. Press OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press AUTO switch.
6. Check that set temperature is maintained.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 12.
2.CHECK FRONT BLOWER MOTOR
1. Start engine.
2. Operate fan switch.
3. Check that fan speed changes. C heck operation for all fan speeds.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 12.
3.CHECK DISCHARGE AIR (MOD E SWITCH AND DEF SWITCH)
1. Operate fan switch to set the fan speed to maximum speed.
2. Operate MODE switch and DEF switch.
3. Check that air outlets change according to each indica ted air outlet by placing a hand in front of the out-
lets. Refer to VTL-6, "
VENTILATION SYSTEM (FRONT AIR CO NDITIONING) : System Description".
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 12.
4.CHECK DISCHRGE AIR (UPPER VENTILATOR SWITCH)
1. Press MODE switch to set the air outlet to other than D/F or DEF.
2. Press upper ventilator switch. The upper ventilator switch indicator is turns ON.
3. Check that air flow blows from upper ventilator.
4. Press upper ventilator switch again. The upper ventilator switch indicator is turns OFF.
5. Check that air flow from upper ventilator stops.
Is the inspection result normal?
YES-1 >> With ACCS (advanced climate control system): GO TO 5.
YES-2 >> Without ACCS (advanced clim ate control system): GO TO 6.
NO >> GO TO 12.
5.CHECK INTAKE AIR [WITH ACCS (A DVANCED CLIMATE CONTROL SYSTEM)]
1. Press intake switch to set the air inlet to recirculation. The intake switch indicator turns ON.
2. Listen to intake sound and confirm air inlets change.
3. Press intake switch again to set the air inlet to fresh air intake. The intake switch indicator turns OFF.
4. Listen to intake sound and confirm air inlets change.
Is the inspection result normal?
Check condition : Engine running at normal operating temperature.
Revision: 2010 May2011 QX56

OPERATION INSPECTIONHAC-63
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONING]
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YES >> GO TO 7.
NO >> GO TO 12.
6.CHECK INTAKE AIR [WITHOUT ACCS (ADVANCED CLIMATE CONTROL SYSTEM)]
1. Press REC switch to set the air inlet to recirculation. The REC switch indicator turns ON.
2. Listen to intake sound and confirm air inlets change.
3. Press FRE switch to set the air inlet to fresh air intake. The REC switch indicator turns OFF and FRE switch indicator turns ON.
4. Listen to intake sound and confirm air inlets change.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 12.
7.CHECK COMPRESSOR
1. Press A/C switch. The A/C switch indicator is turns ON.
2. Check visually and by sound that the compressor operates.
3. Press A/C switch again. The A/C switch indicator is turns OFF.
4. Check that compressor stops.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 12.
8.CHECK DISCHARGE AIR TEMPERATURE (LH/ RH INDEPENDENT TEMERATURE ADJUSTMENT
FUNCTION)
1. Operate temperature control dial (driver side).
2. Check that discharge air temperature (driver side) changes.
3. Operate temperature control dial (passenger side). The DUAL switch indicator is turns ON.
4. Check that the discharge air te mperature (passenger side) changes.
5. Press DUAL switch. The DUAL switch indicator is turns OFF.
6. Check that air temperature se tting (LH/RH) is unified to the driver side temperature setting.
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 12.
9.CHECK WITH TEMPERAT URE SETTING LOWERED
1. Operate compressor.
2. Operate temperature control dial (drive r side) and lower the set temperature to 18°C (60 °F).
3. Check that cool air blows from the air outlets.
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 12.
10.CHECK TEMPERATURE INCREASE
1. Operate temperature control dial (drive r side) and raise the set temperature to 32°C (90 °F).
2. Check that warm air blows from the air outlets.
Is the inspection result normal?
YES >> GO TO 11.
NO >> GO TO 12.
11 .CHECK AUTO MODE
1. Press AUTO switch to confirm that “AUTO” is indicated on the display.
2. Operate temperature control dial (driver side) to check that fan speed or air outlet changes (the air outlet
or fan speed varies depending on the ambient temperatur e, in-vehicle temperature (front side), set tem-
perature, and etc.).
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 12.
Revision: 2010 May2011 QX56