2007 INFINITI QX56 sensor

AUTO LIGHT SYSTEM
LT-35
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OUTLINE
The auto light control system uses an optical sensor that detects outside brightness.
When the lighting switch is in "AUTO" position, it automatically turns on/off the parking lamps and the head-
lamps in accordance with the ambient light. Sensitivity can be adjusted in four steps. For the details of the set-
ting, refer to LT-40, "
Preliminary Check" .
Optical sensor ground is supplied
• to optical sensor terminal 3
• through BCM (body control module) terminal 18.
When ignition switch is turned to “ON” position and when outside brightness is darker than prescribed level,
input is supplied
• to BCM terminal 58
• through optical sensor terminal 4.
The headlamps will then illuminate. For a description of headlamp operation, refer to LT- 5 , "
System Descrip-
tion" .
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "System Description" .
EXTERIOR LAMP BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the AUTO position, and the ignition switch is turned from
ON or ACC to OFF, and one of the front doors is opened, the battery saver control feature is activated.
Under this condition, the headlamps remain illuminated for 5 minutes, then the headlamps are turned off.
Exterior lamp battery saver control mode can be changed by the function setting of CONSULT-II.
DELAY TIMER FUNCTION
When the ignition switch is ON and auto light switch is ON, the BCM turns on/off the headlamps. In delay timer
function, ignition is OFF, auto light sensor power source is OFF and the headlamps are not turned on/off by the
BCM. On condition that:
• when the state of ignition switch ON or ACC is ON and output judgment by auto light function is headlamp
ON changes to ignition switch and ACC are OFF and any door switch is ON, output judgment by BCM
should be headlamp ON for 5 minutes by timer. After time out, output judgment by BCM should be headlamp
OFF.
• when the state of any door switch is turned to ON from OFF while 45 second or 5 minute timer is counting,
timer stops, and restarts counting for 5 minutes, then BCM judges output as headlamp ON. After time out,
BCM judges output as headlamp OFF.
• when the state of front door switch (LH), front door switch (RH), rear door switch LH, rear door switch RH or
back door latch (door ajar switch) is ON turns to all door switches are OFF while 45 second or 5 minute timer
is counting, timer stops, and restarts counting for 45 seconds, then BCM judges output as headlamp ON.
After timer out, BCM judges output as headlamp OFF.
• when the state is ignition switch ON or ACC is ON or auto light switch OFF while timer is counting, timer
stops counting and BCM turns on/off lamps according to headlamp function, front fog lamp function, auto
light function and headlamp battery save function.
Delay timer control mode can be changed by the function setting of CONSULT-II.
CAN Communication System DescriptionINFOID:0000000003533370
Refer to LAN-4, "CAN Communication System" .
Major Component and FunctionsINFOID:0000000003533371
Components Functions
BCM• Turns on/off circuits of tail light and headlamp according to signals from light sensor, lighting switch
(AUTO), front door switch LH, front door switch RH, rear door switch, back door latch (door ajar
switch), and ignition switch (ON, OFF).
Optical sensor • Converts ambient light (lux) to voltage, and sends it to BCM. (Detects lightness of 50 to 1,300 lux)

AUTO LIGHT SYSTEM
LT-41
< SERVICE INFORMATION >
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ACTIVE TEST
Display Item List
SELF-DIAGNOSTIC RESULTS
Display Item List
CONSULT-II Function (IPDM E/R)INFOID:0000000003533379
Refer to PG-18, "CONSULT-II Function (IPDM E/R)" .
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure" .
DATA MONITOR
All Items, Main Items, Select Item Menu
AUTO LIGHT SW "ON/OFF"Displays status of the lighting switch as judged from the lighting switch signal. (AUTO position:
ON/Other than AUTO position: OFF)
PASSING SW "ON/OFF"Displays status (flash-to-pass switch: ON/Others: OFF) of flash-to-pass switch judged from
lighting switch signal.
FR FOG SW "ON/OFF"Displays status (front fog lamp switch: ON/Others: OFF) of front fog lamp switch judged from
lighting switch signal.
DOOR SW-DR "ON/OFF"Displays status of the front door LH as judged from the front door switch LH signal. (Door is
open: ON/Door is closed: OFF)
DOOR SW-AS "ON/OFF"Displays status of the front door RH as judged from the front door switch RH signal. (Door is
open: ON/Door is closed: OFF)
DOOR SW-RR "ON/OFF"Displays status of the rear door as judged from the rear door switch (RH) signal. (Door is open:
ON/Door is closed: OFF)
DOOR SW-RL "ON/OFF"Displays status of the rear door as judged from the rear door switch (LH) signal. (Door is open:
ON/Door is closed: OFF)
BACK DOOR SW "ON/OFF"Displays status of the back door as judged from the back door latch (door ajar switch) signal.
(Door is open: ON/Door is closed: OFF)
TURN SIGNAL R "ON/OFF" Displays status (Turn right: ON/Others: OFF) as judged from lighting switch signal.
TURN SIGNAL L "ON/OFF" Displays status (Turn left: ON/Others: OFF) as judged from lighting switch signal.
CARGO LAMP SW "ON/OFF" Displays status of cargo lamp.
OPTICAL SENSOR [0 - 5V] Displays "ambient light (close to 5V when dark/close to 0V when light)" judged from optical sen-
sor signal. Monitor item Contents
Te s t i t e m D e s c r i p t i o n
TAIL LAMP Allows tail lamp relay to operate by switching ON-OFF.
HEAD LAMP Allows headlamp relay (HI, LO) to operate by switching ON-OFF.
FR FOG LAMP Allows fog lamp relay to operate by switching ON-OFF.
CARGO LAMP Allows cargo lamp to operate by switching ON-OFF.
Monitored item CONSULT-ll display Description
CAN communication CAN communication [U1000] Malfunction is detected in CAN communication.
CAN communication system CAN communication system 1 to 6 [U1000] Malfunction is detected in CAN system.

LT-42
< SERVICE INFORMATION >
AUTO LIGHT SYSTEM
NOTE:
Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is at ACC, the dis-
play may not be correct.
ACTIVE TEST
Trouble Diagnosis Chart by SymptomINFOID:0000000003533380
Lighting Switch InspectionINFOID:0000000003533381
1.CHECK LIGHTING SWITCH INPUT SIGNAL
With CONSULT-II
Item nameCONSULT-II
screen displayDisplay or
unitMonitor item selection
Description
ALL
SIGNALSMAIN
SIGNALSSELECTION
FROM MENU
Parking, license plate
and tail lamps requestTAIL&CLR REQ ON/OFF×× ×Signal status input from BCM
Headlamp low beam re-
questHL LO REQ ON/OFF×× ×Signal status input from BCM
Headlamp high beam re-
questHL HI REQ ON/OFF×× ×Signal status input from BCM
Front fog lamps request FR FOG REQ ON/OFF×× ×Signal status input from BCM
Test item CONSULT-II screen display Description
Tail lamp relay output TAIL LAMPAllows tail lamp relay to operate by switching operation ON-OFF at your
option.
Headlamp relay (HI, LO) out-
put
LAMPSAllows headlamp relay (HI, LO) to operate by switching operation (OFF,
HI, LO) at your option (Headlamp high beam repeats ON-OFF every 1
second).
Front fog lamp relay outputAllows fog lamp relay to operate by switching operation ON-OFF at your
option.
Trouble phenomenon Malfunction system and reference
• Parking lamps and headlamps will not illuminate when out-
side of the vehicle becomes dark. (Lighting switch 1st posi-
tion and 2nd position operate normally.)
• Parking lamps and headlamp will not go out when outside of
the vehicle becomes light. (Lighting switch 1st position and
2nd position operate normally.)
• Headlamps go out when outside of the vehicle becomes
light, but parking lamps stay on.•Refer to LT- 4 0 , "
CONSULT-II Function (BCM)" .
•Refer to LT- 7 3 , "
Combination Switch Inspection" .
•Refer to LT- 4 3 , "
Optical Sensor System Inspection" .
If above systems are normal, replace BCM. Refer to BCS-24, "
BCM" .
Parking lamps illuminate when outside of the vehicle becomes
dark, but headlamps stay off. (Lighting switch 1st position and
2nd position operate normally.)•Refer to LT- 4 0 , "
CONSULT-II Function (BCM)" .
•Refer to LT- 4 3 , "
Optical Sensor System Inspection" .
If above systems are normal, replace BCM. Refer to BCS-24, "
BCM" .
Auto light adjustment system will not operate. (Lighting switch
AUTO, 1st position and 2nd position operate normally.)•Refer to LT- 4 3 , "
Optical Sensor System Inspection" .
If above system is normal, replace BCM. Refer to BCS-24, "
BCM" .
Auto light adjustment system will not operate.• CAN communication line to BCM inspection. Refer to BCS-18,
"CAN Communication Inspection Using CONSULT-II (Self-Diagno-
sis)" .
Shut off delay feature will not operate.• CAN communication line inspection between BCM and combination
meter. Refer to BCS-18, "
CAN Communication Inspection Using
CONSULT-II (Self-Diagnosis)" .
•Refer toBL-25, "
Door Switch Check" .
If above system is normal, replace BCM. Refer to BCS-24, "
BCM" .

AUTO LIGHT SYSTEM
LT-43
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Select "BCM" on CONSULT-II. With "HEAD LAMP" data monitor,
make sure "AUTO LIGHT SW" turns ON-OFF linked with operation
of lighting switch.
Without CONSULT-II
Refer to LT-73, "
Combination Switch Inspection" .
OK or NG
OK >> Inspection End.
NG >> Check lighting switch. Refer to LT-73, "
Combination
Switch Inspection" .
Optical Sensor System InspectionINFOID:0000000003533382
1.CHECK OPTICAL SENSOR INPUT SIGNAL
With CONSULT-II
Select "BCM" on CONSULT-II. With "OPTICAL SENSOR" data mon-
itor, check difference in the voltage when the optical sensor is illumi-
nated and not illuminated.
NOTE:
Optical sensor must be completely subjected to work lamp light. If
the optical sensor is insufficiently illuminated, the measured value
may not satisfy the standard.
Without CONSULT-II
GO TO 2.
OK or NG
OK >> Inspection End.
NG >> GO TO 2.
2.CHECK OPTICAL SENSOR SIGNAL GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connectors and optical sensor connector.
3. Check continuity (open circuit) between BCM harness connector
M18 terminal 18 and optical sensor harness connector M402
terminal 3.
4. Check continuity (short circuit) between BCM harness connector
M18 terminal 18 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3.CHECK OPTICAL SENSOR SIGNAL CIRCUITWhen lighting switch is in
AUTO position: AUTO LIGHT SW ON
SKIA4196E
Illuminated
OPTICAL SENSOR : 3.1V or more
Not illuminated
OPTICAL SENSOR : 0.6V or less
WKIA0486E
18 - 3 : Continuity should exist.
18 - Ground : Continuity should not exist.
WKIA1754E

LT-44
< SERVICE INFORMATION >
AUTO LIGHT SYSTEM
1. Check continuity (open circuit) between BCM harness connector
M20 terminal 58 and optical sensor harness connector M402
terminal 4.
2. Check continuity (short circuit) between BCM harness connector
M20 terminal 58 and ground.
OK or NG
OK >> Replace optical sensor. Refer to LT-44, "Optical Sensor"
. Recheck sensor output with CONSULT-II. If NG, replace BCM. Refer to BCS-24, "BCM" .
NG >> Repair harness or connector.
Optical SensorINFOID:0000000003533383
REMOVAL AND INSTALLATION
Removal
1. Remove defrost grille. Refer to IP-10.
2. Disconnect the connector.
3. Turn the optical sensor counterclockwise to remove it from
defroster grille.
Installation
Installation is in the reverse order of removal.58 - 4 : Continuity should exist.
58 - Ground : Continuity should not exist.
WKIA1755E
WKIA1061E

ENGINE OIL
LU-9
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5. Install Tools.
6. Start the engine and warm it up to normal operating temperature.
7. Check the engine oil pressure with engine running under no-load.
Engine oil pressure [Engine oil temperature at 80°C (175°F)]
Unit: kPa (kg/cm2
, psi)
CAUTION:
If the difference is extreme, check the oil passages and oil pump for leaks and blockages.
8. After the inspections, install oil pressure switch as follows:
a. Remove old liquid gasket adhering to oil pressure switch and engine.
b. Apply liquid gasket and tighten oil pressure switch to the specification.
Use Genuine RTV Silicone Sealant or equivalent. Refer to GI-45, "
Recommended Chemical Prod-
uct and Sealant".
c. After warming up engine, make sure there is no leakage of engine oil with engine running.
Changing Engine OilINFOID:0000000003531556
CAUTION:
• Be careful not to burn yourself, as the engine oil is hot.
• Prolonged and repeated contact with used engine oil may
cause skin cancer; try to avoid direct skin contact with used
engine oil. If skin contact is made, wash thoroughly with soap
or hand cleaner as soon as possible.
1. Remove engine front undercover using power tool.
2. Warm up engine, and check for oil leakage from engine compo-
nents. Refer to LU-8, "
Inspection".
3. Stop engine and wait for 10 minutes.
4. Loosen oil filler cap, then remove drain plug.
5. Drain engine oil.
6. Install drain plug with new washer.
CAUTION:
• Be sure to clean drain plug and install with new washer.
7. Refill with new engine oil. Refer to MA-10, "
Fluids and Lubricants".
Engine oil capacity (Approximate):
Tool number : ST25051001 (J-25695-1)
: ST25052000 (J-25695-2)
WBIA0571E
Engine Speed Approximate Discharge Pressure
Idle speed More than 98 (1.0, 14)
2,000 rpm More than 294 (3.0, 43)
Oil pressure sensor torque : 14.7 N·m (1.5 kg-m, 11 ft-lb)
Oil pan drain plug : 34.3 N·m (3.5 kg-m, 25 ft-lb)
KBIA2498E

ENGINE MAINTENANCE
MA-15
< SERVICE INFORMATION >
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2. Fill the radiator and the reservoir tank (to the “MAX” line), with water. Reinstall the radiator cap and leave
the vented reservoir cap off.
3. Run the engine until it reaches normal operating temperature.
4. Press the engine accelerator two or three times under no-load.
5. Stop the engine and wait until it cools down.
6. Drain the water from the engine cooling system. Refer to CO-9, "
Changing Engine Coolant" .
7. Repeat steps 2 through 6 until clear water begins to drain from the radiator.
Checking Fuel LineINFOID:0000000003533868
Inspect the fuel lines and fuel tank for improper mounting, leaks,
cracks, damage, loose connections, chafing, or deterioration.
As necessary, repair or replace any faulty parts.
Changing Fuel FilterINFOID:0000000003533869
The fuel filter is part of the fuel level sensor unit, fuel filter and fuel pump assembly. Refer to FL-5 .
WARNING:
Before replacing the fuel filter, release the fuel pressure from the fuel system. Refer to EC-80, "
Fuel
Pressure Check".
Changing Engine Air Cleaner FilterINFOID:0000000003533870
VISCOUS PAPER TYPE
NOTE:
• The viscous paper type filter does not need cleaning between replacement intervals.
• Replace the air filter as necessary for required maintenance.
1. Remove the air duct and resonator assembly.
SMA803A
1. Air cleaner case (upper) 2. Air cleaner filter 3. Air cleaner case (lower)
4. Air duct and resonator assembly
WBIA0465E

PB-6
< SERVICE INFORMATION >
PARKING BRAKE SHOE
PARKING BRAKE SHOE
Removal and InstallationINFOID:0000000003532758
COMPONENTS
REMOVAL
WARNING:
Clean the brakes with a vacuum dust collector to minimize the hazard of airborne particles or other
materials.
NOTE:
Remove the disc rotor only with the parking brake pedal completely disengaged.
1. Remove wheel hub and bearing assembly. Refer to FA X - 5 , "
Removal and Installation" .
• Disconnect the wheel sensor at the harness connector. It is not necessary to remove the wheel sensor
from the wheel hub and bearing assembly.
2. Remove the return springs.
3. Remove the adjuster.
4. Remove the retainers, anti-rattle pins and shoes.
5. Disconnect the rear cable from the toggle lever.
6. Remove the back plate.
INSPECTION AFTER REMOVAL
Lining Thickness Inspection
1. Back plate 2. Shoes 3. Toggle lever
4. Return springs 5. Retainers 6. Adjuster
7. Anti-rattle pins
WFIA0164E