ECU INFINITI QX56 2007 Factory Service Manual

HOW TO USE THIS SECTION
LAN-37
< SERVICE INFORMATION >[CAN]
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HOW TO USE THIS SECTION
CautionINFOID:0000000003533620
• This section describes information peculiar to a vehicle, sheets for trouble diagnosis, and inspection proce-
dures.
• For trouble diagnosis procedure, refer to LAN-14, "
Trouble Diagnosis Procedure".
Abbreviation ListINFOID:0000000003533621
Abbreviations in CAN communication signal chart, and the diagnosis sheet are as per the following list.
Abbreviation Unit nameSELECT SYSTEM
(CONSULT-II)CAN DIAG SUPPORT MNTR
(CONSULT-II)
4WD Transfer control unit ALL MODE AWD/4WD AWD/4WD
A-BAG Air bag diagnosis sensor unit AIR BAG –
ABS ABS actuator and electric unit (control unit) ABS VDC/TCS/ABS
ADP Driver seat control unit AUTO DRIVE POS. –
BCM BCM BCM BCM/SEC
DISP Display control unit – DISPLAY
DLC Data link connector – –
ECM ECM ENGINE ECM
HVAC Front air control HVAC –
ICC ICC unit ICCICC
ICC/e4WD
IPDM-E IPDM E/R IPDM E/R IPDM E/R
LASER ICC sensor – ICC SENSOR
M&A Combination meter – METER/M&A
STRG Steering angle sensor – STRG
TCM A/T assembly A/T TCM

LT-6
< SERVICE INFORMATION >
HEADLAMP (FOR USA)
• to BCM terminal 38.
Ground is supplied
• to BCM terminal 67
• through grounds M57, M61 and M79, and
• to IPDM E/R terminals 38 and 59
• through grounds E9, E15 and E24.
Low Beam Operation
With the lighting switch in 2ND position, the BCM receives input requesting the headlamps to illuminate. This
input is communicated to the IPDM E/R across the CAN communication lines. The CPU of the IPDM E/R con-
trols the headlamp low relay coil. When energized, this relay directs power
• through 15A fuse (No. 41, located in the IPDM E/R)
• through IPDM E/R terminal 54
• to front combination lamp RH terminal 5, and
• through 15A fuse (No. 40, located in the IPDM E/R)
• through IPDM E/R terminal 52
• to front combination lamp LH terminal 5.
Ground is supplied
• to front combination lamp LH and RH terminal 1
• through grounds E9, E15 and E24.
With power and ground supplied, low beam headlamps illuminate.
High Beam Operation/Flash-to-Pass Operation
With the lighting switch in 2ND position and placed in HIGH or PASS position, the BCM receives input request-
ing the headlamp high beams to illuminate. This input is communicated to the IPDM E/R across the CAN com-
munication lines. The CPU of the combination meter controls the ON/OFF status of the HIGH BEAM indicator.
The CPU of the IPDM E/R controls the headlamp high relay coil. When energized, this relay directs power
• through 10A fuse (No. 34, located in the IPDM E/R)
• through IPDM E/R terminal 56
• to front combination lamp RH terminal 6, and
• through 10A fuse (No. 35, located in the IPDM E/R)
• through IPDM E/R terminal 55
• to front combination lamp LH terminal 6.
Ground is supplied
• to front combination lamp LH and RH terminal 2
• through grounds E9, E15 and E24.
With power and ground supplied, the high beam headlamps illuminate.
XENON HEADLAMP
Xenon type headlamp is adopted to the low beam headlamps. Xenon bulbs do not use a filament. Instead,
they produce light when a high voltage current is passed between two tungsten electrodes through a mixture
of xenon (an inert gas) and certain other metal halides. In addition to added lighting power, electronic control
of the power supply gives the headlamps stable quality and tone color.
Following are some of the many advantages of the xenon type headlamp.
• The light produced by the headlamps is a white color comparable to sunlight that is easy on the eyes.
• Light output is nearly double that of halogen headlamps, affording increased area of illumination.
• The light features a high relative spectral distribution at wavelengths to which the human eye is most sensi-
tive. This means that even in the rain, more light is reflected back from the road surface toward the vehicle,
for added visibility.
• Power consumption is approximately 25 percent less than halogen headlamps, reducing battery load.
BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the 2ND position (ON), and the ignition switch is turned
from ON or ACC to OFF, the battery saver control feature is activated.
Under this condition, the headlamps remain illuminated for 5 minutes, unless the combination switch (lighting
switch) position is changed. If the combination switch (lighting switch) position is changed, then the headlamps
are turned off.
AUTO LIGHT OPERATION
Refer to LT-34, "System Description" for auto light operation.
VEHICLE SECURITY SYSTEM (PANIC ALARM)

HEADLAMP (FOR USA)
LT-7
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The vehicle security system (panic alarm) will flash the high beams if the system is triggered. Refer to BL-61,
"System Description".
CAN Communication System DescriptionINFOID:0000000003533334
Refer to LAN-4, "CAN Communication System".
SchematicINFOID:0000000003533335
WKWA3637E

HEADLAMP (FOR USA)
LT-21
< SERVICE INFORMATION >
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- Place vehicle and screen on level surface.
- Ensure there is no load in vehicle other than the driver (or equivalent weight placed in driver's position).
Coolant and engine oil filled to correct level, and fuel tank full.
- Confirm spare tire, jack and tools are properly stowed.
- Aim each headlamp individually and ensure other headlamp beam pattern is blocked from screen.
- Use adjusting screw to perform aiming adjustment
NOTE:
Basic illuminating area for adjustment should be within the range shown on the aiming chart. Adjust head-
lamps accordingly.
LOW BEAM AND HIGH BEAM
1. Turn headlamp low beam on.
2. Use adjusting screw to perform aiming adjustment.
Bulb ReplacementINFOID:0000000003533350
CAUTION:
• Disconnect battery negative terminal before touching xenon bulb or headlamp wiring harness
assembly.
• Turn headlamp switch OFF before disconnecting headlamp harness connector.
• Do not touch bulb by hand right after being turned off. Burning may result.
• Do not touch the glass of bulb directly by hand. Keep grease and other oily substances away from it.
• Do not turn xenon bulb ON when xenon bulb is removed from front combination lamp assembly.
• After installing the bulb, be sure to install the bulb socket securely to ensure watertightness.
A. Right B. Left C. Center of headlamp bulb (H-V point)
D. Cutoff line E. Screen F. Aim evaluation segment
G. Step H. Horizontal center line of headlamp J. 103 mm (4.06 in.)
K. 37 mm (1.46 in.) L. 7.62 m (25 ft.) M. 399 mm (15.71 in.)
N. 133 mm (5.24 in.) P. 53.2 mm (2.09 in.) Q. 466 mm (18.35 in.)
R. 200 mm (7.87 in.) S. RH headlamp aiming screen T. LH headlamp aiming screen
LKIA0809E

LT-22
< SERVICE INFORMATION >
HEADLAMP (FOR USA)
• Do not leave bulb out of front combination lamp assembly for a long time because dust, moisture,
smoke, etc. may affect the performance of the lamp. When replacing bulb, be sure to replace it with a
new one.
HEADLAMP (OUTER SIDE), FOR LOW BEAM
Removal
1. Position fender protector aside.
2. Turn headlamp switch OFF.
3. Disconnect battery negative terminal.
4. Remove ballast.
5. Disconnect headlamp electrical connector.
6. Release bulb retaining spring and pull bulb straight out.
Installation
Installation is in the reverse order of removal.
HEADLAMP (INNER SIDE), FOR HIGH BEAM
Removal
1. Turn headlamp switch OFF.
2. Disconnect headlamp electrical connector.
3. Turn the bulb counterclockwise to remove it.
Installation
Installation is in the reverse order of removal.
FRONT PARKING LAMP (INNER OR OUTER)
Removal
1. Turn the bulb socket counterclockwise to unlock it.
2. Pull the bulb to remove it from the socket.
Installation
Installation is in the reverse order of removal.
SIDE MARKER LAMP (FRONT)
Removal
1. Position fender protector aside.
2. Turn the side marker lamp (front) bulb socket counterclockwise and remove side marker lamp (front) bulb
socket.
3. Pull to remove side marker lamp (front) from the side marker lamp (front) bulb socket.
Installation
Installation is in the reverse order of removal.
Removal and InstallationINFOID:0000000003533351
FRONT COMBINATION LAMP ASSEMBLY
CAUTION:
• Disconnect battery negative terminal before touching xenon bulb or headlamp wiring harness
assembly.
• Turn headlamp switch OFF before disconnecting headlamp harness connector.
• Do not touch bulb by hand right after being turned off. Burning may result.
• Do not touch the glass of bulb directly by hand. Keep grease and other oily substances away from it.
• Do not turn xenon bulb ON when xenon bulb is removed from front combination lamp assembly.
• After installing the bulb, be sure to install the bulb socket securely to ensure watertightness.
• Do not leave bulb out of front combination lamp assembly for a long time because dust, moisture,
smoke, etc. may affect the performance of the lamp. When replacing bulb, be sure to replace it with a
new one.
Removal

MA-4
< SERVICE INFORMATION >
GENERAL MAINTENANCE
GENERAL MAINTENANCE
General MaintenanceINFOID:0000000003533859
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 their INFINITI dealers perform them.
OUTSIDE THE VEHICLE
The maintenance items listed here should be performed from 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.
ItemReference page
TiresCheck the pressure with a gauge at least once a month and always prior to a
long distance trip. Adjust to the specified pressure if necessary. Check carefully
for damage, cuts or excessive wear.—
Wheel lug nutsWhen checking the tires, make sure no nuts are missing, and check for any loose
nuts. Tighten if necessary.WT-7, "
Rotation"
WindshieldClean the windshield on a regular basis. Check the windshield at least every six
months for cracks or other damage. Repair as necessary.—
Tire rotationTires should be rotated every 12,000 km (7,500 miles).WT-7, "
Rotation"
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-6, "Balancing
Wheels", FSU-6, "Front
Wheel Alignment"
Windshield wiper
bladesCheck for cracks or wear if they do not wipe properly.
—
Doors and engine
hoodCheck that all doors and the engine hood operate smoothly as well as the back
hatch. 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-30, "
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.LT- 2 0 , "Aiming Adjust-
ment" for US, LT- 3 3 ,
"Aiming Adjustment" for
Canada
ItemReference page
Warning lamps and
buzzers/chimesMake sure that all warning lamps and buzzers/chimes are operating properly.DI-21, "
Electrical Com-
ponent Inspection"
Windshield wiper and
washerCheck that the wipers and washer operate properly and that the wipers do not
streak.—
Windshield defrosterCheck that the air comes out of the defroster outlets properly and in sufficient
quantity when operating the heater or air conditioner.—
Steering wheelCheck 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.PS-7, "
On-Vehicle In-
spection and Service"
SeatsCheck 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.—
Seat beltsCheck that all parts of the seat belt system (e.g. buckles, anchors, adjusters and
retractors) operate properly and smoothly and are installed securely. Check the
belt webbing for cuts, fraying, wear or damage.SB-10, "
Seat Belt Inspec-
tion", MA-30, "Checking
Seat Belts, Buckles, Re-
tractors, Anchors and
Adjusters"
Accelerator pedalCheck the pedal for smooth operation. Keep the floor mats away from the pedal. —

GENERAL MAINTENANCE
MA-5
< SERVICE INFORMATION >
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UNDER THE HOOD AND VEHICLE
The maintenance items listed here should be checked periodically (e.g. each time you check the engine oil or refuel).
BrakesCheck that the brake does not pull the vehicle to one side when applied. —
Brake pedal and
boosterCheck the pedal for smooth operation and make sure it has the proper distance
under it when depressed fully. Check the brake booster function. Keep the floor
mats away from the pedal.BR-5, "
Inspection and
Adjustment", BR-15,
"On-Vehicle Service"
Parking brakeCheck that the parking brake control has the proper travel and make sure that
the vehicle is held securely on a fairly steep hill when only the parking brake is
applied.PB-4
Automatic transmis-
sion “Park” mecha-
nismOn a fairly steep hill check that the vehicle is held securely with the selector lever
in the P position without applying the brakes. — ItemReference page
ItemReference page
Windshield washer
fluidCheck that there is adequate fluid in the tank.
—
Engine coolant levelCheck the coolant level when the engine is cold. —
Radiator and hosesCheck the front of the radiator and clean off any dirt, insects, leaves, etc., that
may have accumulated. Make sure the hoses have no cracks, deformation, de-
terioration or loose connections.—
Brake fluid levelMake sure that the brake fluid level is between the “MAX” and “MIN” lines on the
reservoirsMA-27
BatteryCheck the fluid level in each cell. It should be between the “MAX” and “MIN” lines.
Vehicles operated in high temperatures or under severe conditions require fre-
quent checks of the battery fluid level.—
Engine drive beltMake sure that no belt is frayed, worn, cracked or oily.MA-12
Engine oil levelCheck the level on the dipstick after parking the vehicle on a level spot and turn-
ing off the engine.—
Power steering fluid
level and linesCheck the level on the reservoir with the engine off. Check the lines for improper
attachment, leaks, cracks, etc.MA-28
Automatic transmis-
sion fluid levelCheck the level on the dipstick after putting the selector lever in “P” with the en-
gine idling.MA-21
Exhaust systemMake sure there are no loose supports, cracks or holes. If the sound of the ex-
haust seems unusual or there is a smell of exhaust fumes, immediately locate
the trouble and correct it.MA-21
UnderbodyThe underbody is frequently exposed to corrosive substances such as those
used on icy roads or to control dust. It is very important to remove these sub-
stances, otherwise rust will form on the floor pan, frame, fuel lines and around the
exhaust system. At the end of winter, the underbody should be thoroughly
flushed with plain water, being careful to clean those areas where mud and dirt
can easily accumulate.—
Fluid leaksCheck under the vehicle for fuel, oil, water or other fluid leaks after the vehicle
has been parked for a while. Water dripping from the air conditioner after use is
normal. If you should notice any leaks or gasoline fumes are evident, check for
the cause and correct it immediately.—

CHASSIS AND BODY MAINTENANCE
MA-21
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6. Install the lower glove box in the instrument panel and secure it
with the two hinge pins.
Checking Exhaust SystemINFOID:0000000003533876
Check exhaust pipes, muffler and mounting for improper attachment,
leaks, cracks, damage, loose connections, chafing or deterioration.
Checking Automatic Transmission Fluid (ATF)INFOID:0000000003533877
1. Remove the ATF level gauge bolt.
2. Before driving, the ATF level can be checked at ATF tempera-
tures of 30° to 50°C (86° to 122°F) using the “COLD” range on
the ATF level gauge as follows:
a. Park the vehicle on a level surface and set the parking brake.
b. Start the engine and move the selector lever through each gear
position. Shift the selector lever into the “P” position.
c. Check the ATF level with the engine idling.
d. Remove the ATF level gauge and wipe it clean with a lint-free
paper.
CAUTION:
When wiping the ATF from the ATF level gauge, always use
a lint-free paper, not a cloth.
e. Re-insert the ATF level gauge into the charging pipe until the
cap contacts the top of the charging pipe as shown.
CAUTION:
To check ATF level, insert the ATF level gauge until the cap
contacts the top of the charging pipe, with the gauge
reversed from the normal inserted position.
f. Remove the ATF level gauge and note the ATF level. If the ATF
level is at low side of range, add ATF to the transmission
through the charging pipe.
CAUTION:
Do not overfill the transmission with ATF.
g. Install the ATF level gauge and the ATF level gauge bolt.
3. Warm up the engine.
4. Check for any ATF leaks.
WLIA0027E
SMA211A
WLIA0014E
ATF level gauge bolt : Refer to AT-228, "Component" .
SCIA1684E

PARKING BRAKE SYSTEM
PB-3
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PARKING BRAKE SYSTEM
On-Vehicle ServiceINFOID:0000000003532755
PEDAL STROKE
• When parking brake pedal is operated with the specified force, make sure the stroke is within the specified
number of notches. Check by listening and counting the ratchet clicks.
INSPECTION
• Make sure the components are attached properly, checking for looseness or backlash.
• Check parking brake pedal assembly for bends, damage and cracks, and replace if necessary.
• Check cable for wear and damage, and replace if necessary.
• Check parking brake warning lamp switch for malfunction, and replace if necessary. Refer to DI-27, "
Wiring
Diagram - WARN -".
ADJUSTMENT
1. Remove the lower instrument panel LH. Refer to IP-10, "Removal and Installation" .
2. Partially engage parking brake pedal to access adjusting nut.
3. Insert a deep socket wrench to rotate adjusting nut and loosen
cable sufficiently. Then, disengage the parking brake pedal.
4. Remove the wheel and tire using power tool.
5. Remove the disc rotor and measure inner diameter at widest
point using Tool.
6. Transfer measurement less 0.6 mm to the parking brake shoes
and adjust accordingly.
7. Using wheel nuts, secure the disc to the hub to prevent it from
tilting.
8. Rotate the disc rotor to make sure there is no drag.
9. Adjust cable as follows:
a. Operate pedal 10 or more times with a force of 490 N (50 kg-f,
110 lb-f).
b. Rotate adjusting nut with deep socket to adjust pedal stroke to
specification.
c. With parking brake pedal completely disengaged, make sure
there is no drag on the parking brake.
10. Install the disc rotor.
11. Install the wheel and tire using power tool.
12. Install the lower instrument panel LH. Refer to IP-10, "
Removal and Installation" . Pedal stroke : 3 − 4 notches [under force of 196 N (20.0 kg-f, 44.1 lb-f)]
WFIA0165E
Tool number : — (J-21177-A)
Pedal stroke : 3 − 4 notches [under force of
196 N (20.0 kg-f, 44.1 lb-f)]
WFIA0166E

HARNESS
PG-61
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ICC/BS EC ICC Steering Switch
ICC/SW EC ICC Brake Switch
I/MIRR GW Inside Mirror (Auto Anti-Dazzling Mirror)
IATS EC Intake Air Temperature Sensor
IGNSYS EC Ignition System
ILL LT Illumination
INJECT EC Injector
INT/L LT Room/Map, Vanity, Cargo, Personal, Foot, Step, and Puddle Lamps
KEYLES BL Remote Keyless Entry System
KS EC Knock Sensor
MAFS EC Mass Air Flow Sensor
MAIN EC Main Power Supply and Ground Circuit
METER DI Speedometer, Tachometer, Temp. and Fuel Gauges
MIL/DL EC Malfunction Indicator Lamp
MIRROR GW Door Mirror
NATS BL Nissan Anti-Theft System
NAVI AV Navigation System
O2H2B1 EC Rear Heated Oxygen Sensor 2 Heater Bank 1
O2H2B2 EC Rear Heated Oxygen Sensor 2 Heater Bank 2
O2S2B1 EC Heated Oxygen Sensor 2 Bank 1
O2S2B2 EC Heated Oxygen Sensor 2 Bank 2
P/SCKT WW Power Socket
PGC/V EC EVAP Canister Purge Volume Control Solenoid Valve
PHASE EC Camshaft Position Sensor (PHASE) (Bank 1)
PNP/SW EC Park/Neutral Position Switch
POS EC Crankshaft Position Sensor (POS)
POWER PG Power Supply Routing
PRE/SE EC EVAP Control System Pressure Sensor
PS/SEN EC Power Steering Pressure Sensor
R/VIEW DI Rear View Monitor
RP/SEN EC Refrigerant Pressure Sensor
SEN/PW EC Sensor Power Supply
SHIFT AT A/T Shift Lock System
SONAR DI Rear Sonar System
SROOF RF Sunroof
SRS SRS Supplemental Restraint System
START SC Starting System
STOP/L LT Stop Lamp
T/TOW LT Trailer Tow
T/WARN WT Low Tire Pressure Warning System
TAIL/L LT Parking, License and Tail Lamps
T/F TF Transfer Case
TPS1 EC Throttle Position Sensor
TPS2 EC Throttle Position Sensor
TPS3 EC Throttle Position Sensor
TRNSCV BL HOMELINK® Universal Transceiver
TURN LT Turn Signal and Hazard Warning Lamps
VDC BRC Vehicle Dynamic Control System
VEHSEC BL Vehicle security (theft warning) system
VENT/V EC EVAP Canister Vent Control Valve
W/ANT AV Audio Antenna
WARN DI Warning Lamps