2010 INFINITI QX56 battery

REAR AIR CONTROL SYSTEMHAC-65
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector M50 terminal 43 and terminal 44.
Is the inspection result normal?
YES >> Replace A/C auto amp.
NO >> GO TO 7.
7.CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
Check continuity between A/C auto amp. harness connector M50
terminal 43, 44 and ground.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace harness as necessary.
8.CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN
1. Disconnect the mode door motor (rear) harness connector.
2. Check continuity between A/C auto amp. harness connector M50 (A) terminal 43, 44 and the mode door motor (rear) harness
connector B156 (B) terminal 5, 6.
Is the inspection result normal?
YES >> Replace mode door motor. Refer to VTL-31, "Removal
and Installation".
NO >> Repair or replace harness as necessary.
9.CHECK A/C AUTO AMP. POWER AND GROUND FOR MODE DOOR MOTOR (REAR)
Check voltage between A/C auto amp. harness connector M50 ter-
minal 43 and terminal 44 while pressing the mode switch to the
FLOOR ( ) mode.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
10.CHECK A/C AUTO AMP. FOR MODE DOOR MOTOR (REAR) PBR POWER AND GROUND
Continuity should exist.
AWIIA0190ZZ
43 - Ground
: Continuity should not exist.
44 - Ground : Continuity should not exist.
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5 - 43 : Continuity should exist.
6 - 44 : Continuity should exist.
AWIIA0191ZZ
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
A/C auto amp.: M50 44 43 Press
mode
switch (rear) Battery
voltage
AWIIA0196ZZ
Revision: April 20092010 QX56

HAC-70
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
Check for operation sound when applying battery voltage direct cur-
rent to terminal.
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and
Installation of IPDM E/R".
NO >> Replace magnet clutch. Refer to HA-32, "
Removal and
Installation for Compressor Clutch".
5.CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to HAC-20, "
CONSULT-III Function (HVAC)".
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 6.
6.CHECK CIRCUIT CONTINUITY BETW EEN BCM AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect BCM connector and A/C auto amp. connector.
3. Check continuity between BCM harness connector M18 (A) ter- minal 27 and A/C auto amp. harness connector M49 (B) terminal
4.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair harness or connector.
7.CHECK VOLTAGE FOR A/C AUTO AMP. (A/C COMPRESSOR ON SIGNAL)
1. Reconnect BCM connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49 terminal 4 and ground.
Is the inspection result normal?
YES >> GO TO 8.
NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace A/C auto amp. Refer to VTL-7,
"Removal and Installation".
NO-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to BCS-59, "
Removal
and Installation".
8.CHECK REFRIGERANT PRESSURE SENSOR
1. Start engine.
SJIA0197E
A/C SW ON : COMP ON SIG ON
A/C SW OFF : COMP ON SIG OFF
27 - 4 Continuity should exist.
AWIIA0199ZZ
Te r m i n a l s
Condition Voltage
(+)
(-)
A/C auto
amp. con-
nector Te r m i n a l N o .
M49 4 Ground A/C switch: ON Approx. 0V
A/C switch: OFF Approx. 5V
AWIIA0200ZZ
Revision: April 20092010 QX56

WATER VALVE CIRCUITHAC-73
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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WATER VALVE CIRCUIT
DescriptionINFOID:0000000005147716
COMPONENT DESCRIPTION
Water Valve
The water valve (1) cuts the flow of engine coolant to the front and
rear heater cores to allow for maximum cooling during A/C opera-
tion. It is controlled by the A/C auto amp.
Water Valve Diagnosis ProcedureINFOID:0000000005147717
Regarding Wiring Diagram information, refer to HAC-91, "Wiring Diagram".
DIAGNOSTIC PROCEDURE FOR WATER VALVE
1.CHECK WATER VALVE POWER AND GROUND CIRCUITS
1. Disconnect water valve connector F68.
2. Turn ignition switch ON.
3. Rotate temperature control dial (driver) to 32 °C (90 °F).
4. Check voltage between water valve harness connector F68 ter- minal 1 and terminal 2 while rotating temperature control dial
(driver) to 18 °C (60° F).
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK WATER VALVE CONTROL OUTPUT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector M50.
3. Check continuity between water valve harness connector F68 (A) terminal 2 and A/C auto amp. harness connector M50 (B)
terminal 46.
4. Check continuity between water valve harness connector F68 terminal 2 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and Installation".
NO >> Repair harness or connector.
WJIA1791E
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
Water valve: F68 2 1Rotate temperature
control dial Battery
voltage
WJIA1794E
2 - 46 : Continuity should exist.
2 - Ground : Continuity should not exist.
AWIIA0203ZZ
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HAC-74
< COMPONENT DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
WATER VALVE CIRCUIT
3.CHECK WATER VALVE POWER AND GROUND CIRCUITS
1. Rotate temperature control dial (driver) to 18 °C (60° F).
2. Check voltage between water valve harness connector F68 ter-
minal 1 and terminal 2 while rotating temperature control dial
(driver) to 32 °C (90° F).
Is the inspection result normal?
YES >> Replace the water valve.
NO >> GO TO 4.
4.CHECK WATER VALVE CONTROL OUTPUT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector M50.
3. Check continuity between water valve harness connector F68 (A) terminal 1 and A/C auto amp. harness connector M50 (B)
terminal 45.
4. Check continuity between water valve harness connector F68 (A) terminal 1 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and Installation".
NO >> Repair harness or connector.
Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (-)
Water valve: F68 1 2Rotate temperature
control dial Battery
voltage
WJIA1792E
1 - 45 : Continuity should exist.
1 - Ground : Continuity should not exist.
AWIIA0204ZZ
Revision: April 20092010 QX56

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-87
< COMPONENT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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Check main power supply and ground circuit. Refer to HAC-87, "A/C Auto Amp Power and Ground Diagnosis
Procedure".
Is the inspection result normal?
YES >> System OK.
NO >> Replace A/C auto amp. Refer to VTL-7, "
Removal and Installation".
A/C Auto Amp Power and Ground Diagnosis ProcedureINFOID:0000000005147731
Regarding Wiring Diagram information, refer to HAC-91, "Wiring Diagram".
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
1. CHECK POWER SUPPLY CIRCUITS FOR A/C AUTO AMP.
1. Turn ignition switch ON.
2. Check voltage between A/C auto amp. harness connector M49 (B) terminal 15 and M50 (A) terminal 27, and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to PG-69, "
Terminal
Arrangement".
• If fuses are OK, check harness for open circuit. Repair or replace as necessary.
• If fuses are NG, replace fuse and check harness fo r short circuit. Repair or replace as neces-
sary.
2. CHECK GROUND CIRCUIT FOR A/C AUTO AMP.
AWIIA0212GB
Terminals Ignition switch position
(+)
(-) OFF ACC ON
A/C auto
amp. con- nector Te r m i n a l N o .
M49 15 GroundApprox. 0V Approx. 0V
Battery
voltage
M50 27 Battery
voltage Battery
voltage Battery
voltage
AWIIA1073ZZ
Revision: April 20092010 QX56

AIR CONDITIONER CONTROLHAC-89
< ECU DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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ECU DIAGNOSIS
AIR CONDITIONER CONTROL
A/C Auto Amp. Terminals Reference ValuesINFOID:0000000005147732
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.
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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: April 20092010 QX56

HAC-90
< 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: April 20092010 QX56

PRECAUTIONSHAC-121
< PRECAUTION > [AUTOMATIC AIR CONDITIONER]
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005197361
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service.
Working with HFC-134a (R-134a)INFOID:0000000005147743
WARNING:
• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refr igerant are not compatible. If the refrigerants
are mixed compressor failure is likely to occur. Refer to HA-4, "
Contaminated Refrigerant". To deter-
mine the purity of HFC-134a (R-134a) in the vehic le and recovery tank, use Refrigerant Recovery/
Recycling Recharging equipment and Refrigerant Identifier.
• Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If oil other than that specified is used, compressor fa ilure is likely to occur.
• The specified HFC-134a (R-134a) oil rapidly absorb s moisture from the atmosphere. The following
handling precautions must be observed:
- When removing refrigerant components from a vehicle, immediately cap (seal) the component to
minimize the entry of mois ture from the atmosphere.
- When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the co mponents. Connect all refrigerant lo op components as quickly as possible
to minimize the entry of moisture into system.
- Only use the specified oil from a sealed container. Immediately r eseal containers of oil. Without
proper sealing, oil will become moisture saturat ed and should not be used.
- Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) from the A/C system usi ng certified service equipment meeting require-
ments of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a) recy-
cling equipment], If accidental system discharge occurs, ventilate work area before resuming
service. Additional health and safety information may be obtained from refrigerant and oil manufac-
turers.
- Do not allow A/C oil to come in contact with styrofoam parts. Damage may result.
CONTAMINATED REFRIGERANT
Revision: April 20092010 QX56