2011 INFINITI QX56 air conditioning

HAC-38
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
OPERATION
- When air flow is small
- When air flow is large
Controller (Preset Switch)
JMIIA0410ZZ
JMIIA0411ZZ
1. Auto intake switch
Switch name Function
Auto intake switch  Automatic intake control (exhaust gas / outside odor detecting mechanism) mode (switch indicator)
changes between ON ⇔ OFF each time when auto intake switch is pressed while front blower mo-
tor is activated.
 When auto intake switch turns ON, front air conditioning system becomes the following status.
- A/C switch: ON
- Air inlet: Recirculation [After approximately 5 minutes, air inlet is switched to automatic intake con- trol (exhaust gas / outside odor detecting mechanism).]
 When auto intake switch turns ON ⇒ OFF, air inlet becomes the fresh air intake.
NOTE:
 Interlocking condition of A/C switch can be changed. Refer to HAC-70, "
ACCS (ADVANCED CLI-
MATE CONTROL SYSTEM) : Auto Intake Switch Interlocking Movement Change Function".
 Auto intake switch does not turn ON during the following status.
- Air outlet: DEF
- Ambient temperature: −2 °C (28 °F) or less
JMIIA0826ZZ
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-40
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
DIAGNOSIS SYSTEM (HVAC)
ACTIVE TEST
Check each output device
COMP REQ SIG [On/Off] Displays A/C switch ON/OFF status transmitted to other units via CAN communication
FAN REQ SIG [On/Off]Displays front blower motor ON/OFF status transmitted to other units via CAN commu-
nication
FAN DUTY Duty ratio of front blower motor judged by A/C auto amp.
XM Target discharge front air temperature (driver side) judged by A/C auto amp. depending
on the temperature setting and the value from each sensor
PASS SUNL CAL [w/m
2]Sunload value (passenger side) calculated by A/C auto amp.
PASS SUNLOAD SEN [w/m
2]Sunload sensor value converted from sunload sensor signal (passenger side) received
from sunload sensor
PA TARGET A/TEMP Target discharge front air temperature (passenger side) judged by A/C auto amp. de-
pending on the temperature setting and the value from each sensor
RRIN TEMP SEN [ °C ( °F)] Rear in-vehicle sensor value converted from rear in-vehicle sensor signal received from
rear in-vehicle sensor.
RRIN TEMP CAL [ °C ( °F)] In-vehicle temperature (rear side) value calculated by A/C auto amp.
RR INT TMP CL [ °C ( °F)] Rear evaporator fin temperature value calculated by A/C auto amp.
RRFAN REQ SIG [On/Off] Displays rear blower motor ON/OFF status transmitted to other units via CAN communi-
cation
RR FAN DUTY Duty ratio of rear blower motor judged by A/C auto amp.
RR XM Target discharge rear air temperature (driver side) judged by A/C auto amp. depending
on the temperature setting and the value from each sensor
ENG COOL TEMP [ °C ( °F)] Engine coolant temperature signal value received from ECM via CAN communication
VEHICLE SPEED [km/h
(mph)] Vehicle speed signal value received from combination meter via CAN communication
Monitor item [Unit] Description
Te s t i t e m D e s c r i p t i o n
HVAC TEST The operation check of air conditioning system can be performed by selecting the mode.
Refer to the following table for the conditions of each mode.
Te s t i t e m
MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7
Front mode door motor posi-
tion VENT VENT B/L B/L FOOT D/F DEF
Intake door motor position REC REC 20% FRE 20% FRE FRE FRE FRE
Front air mix door motor (driver
side) position FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Front air mix door motor (pas-
senger side) position FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Front blower motor control sig-
nal duty ratio 35% 35% 59% 59% 89% 89% 35%
Magnet clutch ON ON ON ON OFF OFF ON
Upper ventilator door motor
position OPEN CLOSE OPEN CLOSE CLOSE CLOSE CLOSE
Rear mode door motor posi-
tion VENT VENT B/L B/L FOOT FOOT FOOT
Rear air mix door motor posi-
tion FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Rear blower motor control sig-
nal duty ratio 35% 35% 59% 59% 89% 89% 35%
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

HAC-42
< ECU DIAGNOSIS INFORMATION >[AUTOMATIC AIR CONDITIONING]
A/C AUTO AMP.
ECU DIAGNOSIS INFORMATION
A/C AUTO AMP.
Reference ValueINFOID:0000000006275886
CONSULT-III DATA MONITOR REFERENCE VALUES
Monitor item Condition Value/Status
AMB TEMP SEN Ignition switch ON — Equivalent to ambient tem-
perature
IN-VEH TEMP Ignition switch ON — Equivalent to in-vehicle tem-
perature (front side)
INT TEMP SEN Ignition switch ON — Equivalent to front evapora-
tor fin temperature
SUNLOAD SEN Ignition switch ON — Equivalent to sunload (driver
side)
AMB SEN CAL Ignition switch ON — Equivalent to ambient tem-
perature
IN-VEH CAL Ignition switch ON — Equivalent to in-vehicle tem-
perature (front side)
INT TEMP CAL Ignition switch ON — Equivalent to front evapora-
tor fin temperature
SUNL SEN CAL Ignition switch ON — Equivalent to sunload (driver
side)
COMP REQ SIG Engine: Run at idle after
warming up A/C switch: ON
(Compressor operation sta-
tus)
On
A/C switch: OFF Off
FAN REQ SIG Engine: Run at idle after
warming up Front blower motor: ON On
Front blower motor: OFF Off
FAN DUTY Engine: Run at idle after
warming up Front blower motor: ON 25 – 81
Front blower motor: OFF 0
XM Ignition switch ON — Value according to target air
flow temperature (driver
side)
PASS SUNL CAL Ignition switch ON — Equivalent to sunload (pas-
senger side)
PASS SUNLOAD SEN Ignition switch ON — Equivalent to sunload (pas-
senger side)
PA TARGET A/TEMP Ignition switch ON — Value according to target air
flow temperature (passen-
ger side)
RRIN TEMP SEN Ignition switch ON — Equivalent to in-vehicle tem-
perature (rear side)
RRIN TEMP CAL Ignition switch ON — Equivalent to in-vehicle tem-
perature (rear side)
RR INT TMP CL Ignition switch ON — Equivalent to rear evapora-
tor fin temperature
RRFAN REQ SIG Engine: Run at idle after
warming up Rear blower motor: ON On
Rear blower motor: OFF Off
RR FAN DUTY Engine: Run at idle after
warming up Rear blower motor: ON 25 – 81
Rear blower motor: OFF 0
Revision: 2010 May2011 QX56

A/C AUTO AMP.HAC-43
< ECU DIAGNOSIS INFORMATION > [AUTOMATIC AIR CONDITIONING]
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TERMINAL LAYOUT
PHYSICAL VALUES
RR XM Ignition switch ON — Value according to target air
flow temperature (rear side)
ENG COOL TEMP Ignition switch ON — Equivalent to engine coolant
temperature
VEHICLE SPEED Driving — Equivalent to speedometer
reading
Monitor item Condition Value/Status
JMIIA0787ZZ
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ − Signal name Input/
Output
1
(L) —CAN-H Input/
Output ——
2
(B) —Ground — — —
3
(Y/G) Ground Battery power supply Input Ignition switch OFF Battery voltage
4
(V) Ground ACC power supply Input Ignition switch ACC Battery voltage
5
*1
(W) Ground
Ionizer (ON/OFF) control
signal
OutputIgnition
switch
ON Front blower
motor: ON
0 V
Front blower
motor: OFF 12 V
6
(V/W) GroundA/C auto amp. connection
recognition signal Output Ignition switch ON 12 V
7
(W/R) Ground Ambient sensor signal Input Ignition switch ON 0 – 4.8 V
Output voltage varies with ambient temperature
8
(GR/L) Ground
Rear in-vehicle sensor sig-
nal Input Ignition switch ON 0 – 4.8 V
Output voltage varies with in-vehi-
cle temperature (rear side)
9
(BR) GroundSunload sensor (driver side)
signal
Input Ignition switch ON 0 – 4.8 V
Output voltage varies with sunload (driver side) amount
10
*1
(V/W) Ground
Exhaust gas / outside odor
detecting sensor signal InputIgnition switch ON
NOTE:
The signal is depending
on measurement environ-
ment of the vehicle
ZJIA1163J
Revision: 2010 May2011 QX56

HAC-44
< ECU DIAGNOSIS INFORMATION >[AUTOMATIC AIR CONDITIONING]
A/C AUTO AMP.
11
(W) GroundCommunication signal
(A/C auto amp.
→Rear A/C
control) Output Ignition switch ON
14
(O/L) GroundFront blower motor control
signal
Output Ignition switch ON
 Front fan speed: 1st
speed (manual)
16
(R/G) Ground Each door motor LIN signal Input/
Output Ignition switch ON
17
(L/Y) GroundEach door motor power sup-
ply
Output Ignition switch ON 12 V
21
(P) —CAN-L
Input/
Output ——
22
(B) —Ground — — —
23
(GR/L) Ground Ignition power supply Input Ignition switch ON Battery voltage
25
*1, *
(R) ———— —
26
(B) — Sensor ground — — —
27
(GR) GroundFront in-vehicle sensor sig-
nal
Input Ignition switch ON 0 – 4.8 V
Output voltage varies with in-vehi- cle temperature (front side)
28
(R) Ground Intake sensor signal Input Ignition switch ON 0 – 4.8 V
Output voltage varies with front evaporator fin temperature
29
(O) Ground
Sunload sensor (passenger
side) signal Input Ignition switch ON 0 – 4.8 V
Output voltage varies with sunload
(passenger side) amount
31
(O/L) GroundCommunication signal
(Rear A/C control
→A/C auto
amp.) Input Ignition switch ON
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ − Signal name Input/
Output
SJIA1521J
JSIIA0096ZZ
SJIA1453J
SJIA1522J
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