2010 INFINITI QX56 heater

INSUFFICIENT HEATINGHAC-117
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
Check engine coolant temperature sensor. Refer to EC-123, "Component Inspection".
Is the inspection result normal?
YES >> System OK.
NO >> Repair or replace as necessary. Retest.
9.CHECK HEATER HOSES
Check heater hoses for proper installation.
Is the inspection result normal?
YES >> System OK.
NO >> 1. Back flush heater core. 2. Drain the water from the system.
3. Refill system with new engine coolant. Refer to CO-11, "
Changing Engine Coolant".
4. GO TO 10 to retest.
10.CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be warm.
Is the inspection result normal?
YES >> System OK.
NO >> Replace heater core. Refer to VTL-24, "
Removal and Installation".
11 .CHECK WATER VALVE
Check the operation of the water valve. Refer to HAC-73, "
Water Valve Diagnosis Procedure".
Is the inspection result normal?
YES >> System OK.
NO >> Replace water valve.
Revision: April 20092010 QX56

MA-6
< ON-VEHICLE MAINTENANCE >
GENERAL MAINTENANCE
ON-VEHICLE MAINTENANCE
GENERAL MAINTENANCE
General MaintenanceINFOID:0000000005145933
General maintenance includes those items which should be checked during the normal day-to-day operation
of the vehicle. They are essential if the vehicle is to continue operating properly. The owner can perform these
checks and inspections or have thei r INFINITI dealers perform them.
OUTSIDE THE VEHICLE
The maintenance items listed here should be performed fr om time to time, unless otherwise specified.
INSIDE THE VEHICLE
The maintenance items listed here should be checked on a regular basis, such as when performing periodic maintenance, cleaning the vehicle,
etc.
Item Reference page
Tires Check the pressure with a gauge often and always prior to long distance trips.
Adjust the pressure in all tires, including the spare, to the pressure specified.
Check carefully for damage, cuts or excessive wear. WT-47, "
Inspection"
Wheel lug nuts
When checking the tires, make sure no nuts are missing, and check for any loose
nuts. Tighten if necessary. WT-49, "Rotation"
Windshield
Clean the windshield on a regular basis. Check the windshield at least every six
months for cracks or other damage. Repair as necessary. GW-11, "Removal and
Installation"
Tire rotation
Tires should be rotated every 12,000 km (7,500 miles). WT-49, "Rotation"
Tire Pressure Monitor-
ing System (TPMS)
transmitter componentsReplace the TPMS transmitter grommet seat, valve core and cap when the tires
are replaced due to wear or age.
WT-50, "Transmitter
(Pressure Sensor)"
Wheel alignment and
balanceIf the vehicle pulls to either side while driving on a straight and level road, or if
you detect uneven or abnormal tire wear, there may be a need for wheel align-
ment. If the steering wheel or seat vibrates at normal highway speeds, wheel bal-
ancing may be needed. WT-48, "Balancing
Wheels", FSU-6, "Front
Wheel Alignment"
Windshield wiper
blades
Check for cracks or wear if they do not wipe properly.
—
Doors and engine
hood Check that all doors and the engine hood operate smoothly as well as the back
door. Also make sure that all latches lock securely. Lubricate if necessary. Make
sure that the secondary latch keeps the hood from opening when the primary
latch is released.
When driving in areas using road salt or other corrosive materials, check lubri-
cation frequently. MA-38, "
LOCKS AND
HINGES : Lubricating
Locks, Hinges and Hood
Latches"
Lamps
Make sure that the head lamps, stop lamps, tail lamps, turn signal lamps, and
other lamps are all operating properly and installed securely. Also check head
lamp aim. Clean the head lamps on a regular basis. EXL-145, "HEADLAMP :
Aiming Adjustment"
Item
Reference page
Warning lamps and
chimes Make sure that all warning lamps and chimes are operating properly.
WCS-4, "
WARNING
CHIME SYSTEM : Sys-
tem Description"
Windshield wiper and
washerCheck that the wipers and washer operate properly and that the wipers do not
streak.
—
Windshield defroster Check that the air comes out of the defroster outlets properly and in sufficient
quantity when operating the heater or air conditioner. —
Steering wheel Check that it has the specified play. Be sure to check for changes in the steering
condition, such as excessive play, hard steering or strange noises.
Free play: less than 35mm (1.38 in) ST-15, "
On-Vehicle In-
spection and Service"
Seats
Check seat position controls such as seat adjusters, seat back recliner, etc. to
make sure they operate smoothly and that all latches lock securely in every po-
sition. Check that the head restraints move up and down smoothly and that the
locks (if equipped) hold securely in all latched positions. Check that the latches
lock securely for folding-down rear seat backs. —
Revision: April 20092010 QX56

MA-18
< ON-VEHICLE MAINTENANCE >
ENGINE MAINTENANCE
5. Remove the reservoir tank to drain the engine coolant, then clean the reservoir tank before installing it.
6. Check the drained coolant for contaminants such as rust, corrosion or discoloration.
If the coolant is contaminated, flush the engine cooling system. Refer to MA-17, "
ENGINE COOLANT :
Changing Engine Coolant".
REFILLING ENGINE COOLANT
1. Close the radiator drain plug. Install the reservoir tank, cylinder block drain plug, and the oil cooler hose, if
removed for a total system drain or for engine removal or repair.
• The radiator must be completely empty of coolant and water.
• Apply sealant to the threads of the cylinder bl ock drain plug. Use Genuine High Performance Thread
Sealant or equivalent. Refer to GI-15, "
Recommended Chemical Products and Sealants".
2. Set the vehicle heater controls to the full HOT and heat er ON position. Turn the vehicle ignition ON with
the engine OFF as necessary to activate the heater mode.
3. Remove the vented reservoir cap and replace it with a non-vented reservoir cap before filling the cooling
system.
4. Install the Tool by installing the radiator cap adapter onto the radiator neck opening. Then attach the gauge body assembly
with the refill tube and the venturi assembly to the radiator cap
adapter.
5. Insert the refill hose into the coolant mixture container that is placed at floor level. Make sure the ball valve is in the closed
position.
• Use Genuine NISSAN Long Life Anti-freeze coolant or equiva-lent, mixed 50/50 with distilled water or demineralized water.
Refer to MA-13, "
Fluids and Lubricants".
6. Install an air hose to the venturi assembly, the air pressure must be within specification.
CAUTION:
The compressed air supply must be equipped with an air
dryer.
7. The vacuum gauge will begin to rise and there will be an audible hissing noise. During this process open the ball valve on the refill hose slightly. Coolant will be vi sible rising in the refill hose. Once the refill hose is
full of coolant, close the ball valve. This will purge any air trapped in the refill hose.
8. Continue to draw the vacuum until the gauge reaches 28 inches of vacuum. The gauge may not reach 28 inches in high altitude
locations, use the vacuum specifications based on the altitude
above sea level.Radiator drain plug
: Refer to MA-17
.
RH cylinder block drain plug : Refer to EM-83
.
Tool number : KV991J0070 (J-45695)
Cooling system capacity
(with reservoir) : Refer to
MA-13, "
Fluids
and Lubricants".
Compressed air
supply pressure : 5.7 - 8.5 kPa (5.6 - 8.4 kg/cm
2, 80
- 120 psi)
LLIA0058E
Altitude above sea level Vacuum gauge reading
0 - 100 m (328 ft) : 28 inches of vacuum
300 m (984 ft) : 27 inches of vacuum
LLIA0057E
Revision: April 20092010 QX56

MA-26
< ON-VEHICLE MAINTENANCE >
CHASSIS AND BODY MAINTENANCE
CHASSIS AND BODY MAINTENANCE
IN-CABIN MICROFILTER
IN-CABIN MICROFILTER : Removal and InstallationINFOID:0000000005403149
REPLACEMENT PROCEDURE
1. Remove the glove box assembly from the instrument panel. Refer to IP-17, "Removal and Installation".
2. Remove the screw and remove the in-cabin microfilter cover as shown.
3. Remove the two in-cabin microf ilters from the front heater and
cooling unit assembly housing.
4. Insert the first new in-cabin micr ofilter into the front heater and
cooling unit assembly housing and slide it over to the right.
Insert the second new in-cabin mi crofilter into the front heater
and cooling unit assembly housing as shown.
NOTE:
The in-cabin microfilters are marked with air flow arrows. The
end of the microfilter with the arro w should face the rear of the
vehicle. The arrows should point downward.
5. Install the in-cabin microfilter cover.
6. Install the glove box assembly in the instrument panel. Refer to IP-17, "
Removal and Installation".
7. Fill out the date information on the small replac ement label and attach it to the glove box lid.
EXHAUST SYSTEM
EXHAUST SYSTEM : Checking Exhaust SystemINFOID:0000000005403150
Check exhaust pipes, muffler and mounting for improper attachment, leaks, cracks, damage or deterioration.
LJIA0134E
LJIA0148E
LJIA0134E
Revision: April 20092010 QX56

PG-52
< COMPONENT DIAGNOSIS >
HARNESS
G3 B3 W/16 : Suspension control unitC5 B69 SMJ : To M40
E4 B6 W/18 : To D201 G2 B70 GR/3 : Rear combination lamp LH
C5 B7 — : Body ground D5 B72 BR/6 : Subwoofer
D4 B8 W/3 : Front door switch LH F3 B73 W/16 : Rear view camera control unit
C4 B9 Y/12 : Air bag diagnosis sensor unit C4 B74 Y/4 : Seat belt buckle pre-tensioner assembly LH
E5 B10 Y/2 : Front LH side air bag module F2 B75 W/10 : To B400
F3 B13 W/24 : ICC unit F2 B76 GR/2 : Luggage area antenna
E5 B14 Y/2 : Front LH seat belt pre-tensioner C3 B78 W/3 : Rear seat heater RH
E5 B15 Y/2 : LH side air bag (satellite) sensor E3 B79 W/3 : Rear seat heater LH
G3 B17 GR/24 : ICC unit Front seat LH harness
E3 B18 W/3 : Rear door switch LH D3 B200 W/16 : To B37
G1 B19 — : Body ground D5 B202 W/32 : Driver seat control unit
G2 B24 W/16 : Sonar control unit D5 B203 W/16 : Driver seat control unit
B4 B32 W/6 : To B124 C5 B204 GR/5 : Sliding motor LH
G2 B35 B/3 : Rear combination lamp LH D3 B205 W/4 : Reclining motor LH
D3 B37 W/16 : To B200 C4 B206 GR/5 : Lifting motor (front)
C5 B38 Y/2 : LH side front curtain air bag module D4 B207 GR/5 : Lifting motor (rear)
C5 B40 W/24 : To E34 D4 B208 W/10 : Power seat switch LH
C5 B41 W/12 : To E35 D4 B209 W/3 : Front seat heater LH
C5 B42 W/2 : To E36 D5 B210 W/4 : Lumbar support switch
B4 B43 W/16 : To B111 E5 B211 B/2 : Lumbar support motor
F1 B48 W/18 : To D401 Third row power folding seat sub-harness
F1 B49 W/2 : To D402 F2 B400 W/10 : To B75
F2 B52 W/2 : Rear power vent window motor LH E3 B401 GR/12 : Third row power folding seat control unit
F2 B54 Y/2 : LH side rear curtain air bag module E3 B402 W/10 : Third row power folding seat control unit
G3 B55 W/26 : Back door control unit F3 B403 GR/4 : Third row power folding seat motor LH
F2 B56 GR/16 : Sonar control unit (with front and rear
sonar system) E2 B404 W/4 : To B425
G2 B57 GR/10 : Sonar control unit (with front and rear
sonar system) E3 B425 W/4 : To B404
G1 B63 W/6 : Back door close switch E2 B426 GR/4 : Third row power folding seat motor RH
Revision: April 20092010 QX56

PG-54
< COMPONENT DIAGNOSIS >
HARNESS
ROOM LAMP HARNESS
F4 B111 W/16 : To B43B2 B153 W/2 : Cargo lamp
E3 B113 Y/12 : Air bag diagnosis sensor unit E5 B154 W/2 : To B303
D5 B114 Y/2 : RH side air bag (satellite) sensor B3 B155 B/6 : Air mix door motor (rear)
C3 B116 W/3 : Rear door switch RH B3 B156 B/6 : Mode door motor (rear)
F5 B117 — : Body ground E5 B157 Y/4 : Seat belt buckle pre-tensioner assembly RH
E5 B118 W/3 : Front seat heater RH C3 B162 BR/6: Third row power folding seat switch
passenger side (front)
A2 B119 W/2 : Condenser-3 A3 B163 W/6: Third row power folding seat switch
passenger side (rear)
A2 B120 W/2 : Condenser-4 C3 B164 W/6: Third row power folding seat switch
driver side (front)
F4 B124 W/6 : To B32 A3 B165 BR/6: Third row power folding seat switch
driver side (rear)
E4 B126 Y/2 : Front RH side air bag module B2 B166 B/2 : Rear sonar buzzer
D4 B127 Y/2 : Front RH seat belt pre-tensioner Front seat RH harness
C3 B128 Y/2 : RH side rear curtain air bag module E5 B303 W/2 : To B154
F3 B129 Y/2 : RH side front curtain air bag module E4 B308 W/10 : Power seat switch RH
A3 B130 GR/3 : Rear combination lamp RH E4 B309 GR/2 : Sliding motor RH
A3 B132 — : Body ground E5 B310 GR/2 : Lifting motor RH (rear)
A3 B133 W/4 : Variable blower control (re ar)E4 B311 GR/2 : Lifting motor RH (front)
B3 B134 W/2 : Rear blower motor E4 B350 W/8 : To B136
E3 B136 W/8 : To B350 E4 B351 B/18 : Occupant classification system control unit
D5 B137 W/3 : Belt tension sensor E4 B352 B/3 : Occupant classification system sensor
B2 B138 B/3 : Rear cargo power sock etE4 B372 W/2 : Reclining motor RH
A1 B139 W/16 : To D602
Revision: April 20092010 QX56

VTL-1
VENTILATION, HEATER & AIR CONDITIONER
C
DE
F
G H
J
K L
M
SECTION VTL
A
B
VTL
N
O P
CONTENTS
VENTILATION SYSTEM
PRECAUTION ....... ........................................2
PRECAUTIONS .............................................. .....2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
2
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ............................... ......
2
Precaution for Working with HFC-134a (R-134a) ......3
Precaution for Procedure without Cowl Top Cover ......3
PREPARATION ............................................4
PREPARATION .............................................. .....4
Commercial Service Tool .................................... ......4
FUNCTION DIAGNOSIS ...............................5
IN-CABIN MICROFILTER .............................. .....5
Description .......................................................... ......5
ON-VEHICLE MAINTENANCE .....................6
IN-CABIN MICROFILTER .............................. .....6
Removal and Installation ...........................................6
ON-VEHICLE REPAIR .... ..............................7
CONTROL UNIT ..................................................7
Removal and Installation ...........................................7
IN-VEHICLE SENSOR ................................... .....9
Removal and Installation ...........................................9
OPTICAL SENSOR ........................................ ....10
Removal and Installation .........................................10
INTAKE SENSOR ..............................................11
Removal and Installation .........................................11
BLOWER MOTOR .......................................... ....12
Component .......................................................... ....12
Removal and Installation .........................................12
VARIABLE BLOWER CONTROL .....................14
Components ............................................................14
Removal and Installation .........................................15
HEATER & COOLING UNIT ASSEMBLY ........16
Component ..............................................................16
Removal and Installation .........................................17
EVAPORATOR .................................................19
Removal and Installation for Front Evaporator ........19
Removal and Installation for Rear Evaporator .........20
EXPANSION VALVE .........................................22
Removal and Installation for Rear Expansion
Valve .................................................................... ....
22
HEATER CORE .................................................23
Component ..............................................................23
Removal and Installation .........................................24
DEFROSTER DOOR MOTOR ..........................26
Removal and Installation .........................................26
INTAKE DOOR MOTOR ...................................27
Removal and Installation .........................................27
MODE DOOR MOTOR ......................................28
Components ............................................................28
Removal and Installation .........................................29
AIR MIX DOOR MOTOR ...................................30
Component ..............................................................30
Removal and Installation .........................................31
DUCTS AND GRILLES .....................................33
Component ..............................................................33
Removal and Installation .........................................36
Revision: April 20092010 QX56

IN-CABIN MICROFILTERVTL-5
< FUNCTION DIAGNOSIS >
C
DE
F
G H
J
K L
M A
B
VTL
N
O P
FUNCTION DIAGNOSIS
IN-CABIN MICROFILTER
DescriptionINFOID:0000000005147603
FUNCTION
The air inside the passenger compartment is filtered by the in-cabin
microfilters when the heater or A/C controls are set on either the
recirculation or fresh mode. The two in-cabin microfilters are located
in the front heater and cooling unit assembly. The rear heater and
cooling unit assembly only draws in air from the passenger compart-
ment to recirculate into the passenger compartment, so the rear
heater and cooling unit assembly is not equipped with in-cabin
microfilters.
REPLACEMENT TIMING
Replacement of the two in-cabin microfilters is recommended on a regular interval depending on the driving
conditions. Refer to MA-9, "
Introduction of Periodic Maintenance". It may also be necessary to replace the two
in-cabin microfilters as part of a component r eplacement if the in-cabin microfilters are damaged.
LJIA0012E
Revision: April 20092010 QX56