ECU INFINITI QX56 2009 Factory Service Manual

HAC-2
MAGNET CLUTCH ............................................72
System Description .............................................. ...72
Magnet Clutch Component Function Check ........ ...72
Magnet Clutch Diagnosis Procedure ................... ...73
WATER VALVE CIRCUIT ..................................77
Description ........................................................... ...77
Water Valve Diagnosis Procedure ..........................77
AMBIENT SENSOR ...........................................79
Component Description ....................................... ...79
Ambient Sensor Diagnosis Procedure ....................79
Ambient Sensor Component Inspection .................80
IN-VEHICLE SENSOR .......................................82
Component Description ....................................... ...82
In-Vehicle Sensor Diagnosis Procedure .................82
In-Vehicle Sensor Component Inspection ..............84
OPTICAL SENSOR ...........................................85
Component Description ..........................................85
Optical Sensor Diagnosis Procedure ......................85
INTAKE SENSOR ..............................................87
System Description .............................................. ...87
Intake Sensor Diagnosis Procedure .......................87
Intake Sensor Component Inspection ................. ...88
POWER SUPPLY AND GROUND CIRCUIT
FOR CONTROLLER ..........................................
89
Component Description ....................................... ...89
A/C Auto Amp. Component Function Check ..........89
A/C Auto Amp Power and Ground Diagnosis Pro-
cedure .....................................................................
90
ECU DIAGNOSIS .......................................91
AIR CONDITIONER CONTROL ..................... ...91
A/C Auto Amp. Terminals Reference Values ..........91
Wiring Diagram .................................................... ...93
SYMPTOM DIAGNOSIS ...........................109
AIR CONDITIONER CONTROL ..................... ..109
Symptom Matrix Chart ........................................ .109
INSUFFICIENT COOLING ................................110
Component Function Check ................................ .110
Diagnostic Work Flow ...........................................111
Performance Chart ................................................113
Trouble Diagnoses for Abnormal Pressure ...........114
INSUFFICIENT HEATING ................................118
Component Function Check .................................118
NOISE ...............................................................120
Component Function Check ................................ .120
MEMORY FUNCTION DOES NOT OPERATE ..122
Memory Function Check ...................................... .122
PRECAUTION ...........................................123
PRECAUTIONS .............................................. ..123
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. .
123
Working with HFC-134a (R-134a) ........................ .123
Precaution for Service Equipment ........................124
Revision: December 20092009 QX56

HAC-20
< FUNCTION DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (HVAC)
DIAGNOSIS SYSTEM (HVAC)
CONSULT-III Function (HVAC)INFOID:0000000003775338
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
SELF-DIAGNOSIS
Display Item List
DATA MONITOR
Display Item List
Diagnostic mode
Description
SELF-DIAG RESULTS Displays A/C au to amp. self-diagnosis results.
DATA MONITOR Displays A/C auto amp. input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read. ECU PART NUMBER A/C auto amp. part number can be read.
DTC Description
Reference page
B2573 Battery voltage out of range CHG-8, "
Inspection Procedure"
B2578 In-vehicle sensor circuit out of range (low)
HAC-82, "In-Vehicle Sensor Diagnosis Procedure"B2579 In-vehicle sensor circuit out of range (high)
B257B Ambient sensor circuit short HAC-79, "
Ambient Sensor Diagnosis Procedure"B257C Ambient sensor circuit open
B257F Optical sensor (Driver) circuit open or short HAC-85, "
Optical Sensor Diagnosis Procedure".
B2580 Optical sensor (Passenger) circuit open or short
B2581 Intake sensor circuit short HAC-87, "
Intake Sensor Diagnosis Procedure"B2582 Intake sensor circuit open
U1000 CAN bus fault LAN-14, "
Trouble Diagnosis Flow Chart"
Monitor itemValue Contents
BATT VIA CAN "V" Displays battery voltage signal.
IGN VIA CAN "ON/OFF" Displays ignition switch signal.
DVR SUNLD SEN "w/m2" Displays optical sensor (driver) signal.
PAS SUNLD SEN "w/m2" Displays optical sensor (passenger) signal.
AMB TEMP SEN "° C" Displays ambient sensor signal.
EVAP TEMP SEN "° C" Displays intake sensor signal.
INCAR TMP SEN "° C" Displays in-vehicle sensor signal.
RR TEMPSET FR "V" Displays air mix door (front) set point signal.
RR TEMPSET RR "V" Displays air mix door (rear) set point signal.
MODE FDBCK "V" Displays mode door motor feedback signal.
DVR MIX FDBCK "V" Displays air mix door motor (driver) feedback signal.
PAS MIX FDBCK "V" Displays air mix door motor (passenger) feedback signal.
RR FDBCK "V" Displays air mix door motor (rear) feedback signal.
DEF FDBCK "V" Displays defroster door motor feedback signal.
Revision: December 20092009 QX56

DIAGNOSIS SYSTEM (BCM)HAC-21
< FUNCTION DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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HAC
N
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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

AIR CONDITIONER CONTROLHAC-91
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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G H
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HAC
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ECU DIAGNOSIS
AIR CONDITIONER CONTROL
A/C Auto Amp. Terminals Reference ValuesINFOID:0000000003775388
Measure voltage between each terminal and ground by following
Terminals and Reference Value for A/C auto amp. (1).
A/C AUTO AMP. HARNESS CO NNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUES FOR A/C AUTO AMP.
AWIIA0170ZZ
AWIIA0840ZZ
Te r m i n a l No. Wire
color Item
Ignition
switch Condition
Voltage (V)
(Approx.)
1 G/O Optical sensor (driver) ON- 0 - 5V
2 L Air mix door motor (passe nger) ON-Battery voltage
3 P V ref ACTR (ground) ON- 5V
4 W/R Compressor ON signal ON A/C switch OFF
5V
ON A/C switch ON 0V
5 L/R Fan ON signal ON Blower switch OFF
5V
ON Blower switch ON 0V
6 SB Air mix door motor (driver) feedback ON -0 - 5V
7 GR Mode door motor feedback ON- 0 - 5V
8 R/L Illumination + ON Park lamps ONBattery voltage
9 BR Illumination - - Park lamps ON
10 LG/B Defroster door motor feedback ON -0 - 5V
11 L/B Intake sensor ON- 0 - 5V
12 G/Y Variable blower control (rear) ON- 0 - 5V
13 G/R Variable blower control (front) ON- 0 - 5V
PIIA2344E
Revision: December 20092009 QX56

HAC-92
< ECU DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
14 G/W Air mix door motor (passenger) CW ON Clockwise rotation
Battery voltage
15 Y/G Power supply for IGN ON- Battery voltage
17 W/G Air mix door motor (driver) CW ON Clockwise rotationBattery voltage
18 G Air mix door motor (driver) CCW ON Coun terclockwise rotationBattery voltage
19 BR/W Mode door motor CW (front) ON Clockwise rotationBattery voltage
20 P/L Mode door motor CCW ON Counterclockwise rotationBattery voltage
21 G/B Intake door motor CCW ON Counterclockwise rotationBattery voltage
22 O Intake door motor CW ON Clockwise rotationBattery voltage
23 LG Defroster door motor CW ON Clockwise rotationBattery voltage
24 P/B Defroster door motor CCW ON Counterclockwise rotationBattery voltage
25 P Ambient sensor ON- 0 - 5V
26 V/R Sensor ground ON- 0V
27 Y/R Power supply for BAT -- Battery voltage
28 Y V ref ACTR (5V) ON- 0 - 5V
29 R/W Air mix door motor (passenger) feed-
back
ON
- 0 - 5V
30 R/Y Mode door motor (Rear) feedback ON -0 - 5V
31 BR/Y In-vehicle sensor motor (+) ON- Battery voltage
32 LG/R In-vehicle sensor signal ON- 0 - 5V
33 R/Y Air mix door motor (Rear) feedback ON -0 - 5V
36 B Ground -- 0V
40 P CAN-L ON- 0 - 5V
41 L CAN-H ON- 0 - 5V
42 W/V Optical sensor (passenger) ON- 0 - 5V
43 GR/R Mode door motor (Rear) CW ON Clockwise rotationBattery voltage
44 L/Y Mode door motor (Rear) CCW ON Counterclockwise rotation Battery voltage
45 Y/L Water valve ONWater valve open
Battery voltage
Water valve closed 0V
46 W/G Water valve ONWater valve open
0V
Water valve closed Battery voltage
47 O LIN BUS (rear) ON- Battery voltage
48 O LIN BUS (front) ON- Battery voltage
49 GR/R Air mix door motor (Rear) CW ONClockwise rotation Battery voltage
50 L/Y Air mix door motor (Rear) CCW ON Counterclockwise rotation Battery voltage
Te r m i n a l
No. Wire
color ItemIgnition
switch Condition Voltage (V)
(Approx.)
Revision: December 20092009 QX56

AIR CONDITIONER CONTROLHAC-93
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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HAC
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Wiring DiagramINFOID:0000000003775389
ABIWA0010GB
Revision: December 20092009 QX56

HAC-94
< ECU DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
ABIWA0011GB
Revision: December 20092009 QX56

AIR CONDITIONER CONTROLHAC-95
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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HAC
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ABIWA0012GB
Revision: December 20092009 QX56

HAC-96
< ECU DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
ABIIA0051GB
Revision: December 20092009 QX56

AIR CONDITIONER CONTROLHAC-97
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
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G H
J
K L
M A
B
HAC
N
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ABIIA0052GB
Revision: December 20092009 QX56