2007 INFINITI QX56 service

LT-40
< SERVICE INFORMATION >
AUTO LIGHT SYSTEM
How to Proceed with Trouble Diagnosis
INFOID:0000000003533376
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT-34, "
System Description" .
3. Carry out the Preliminary Check. Refer to LT-40, "
Preliminary Check" .
4. Check symptom and repair or replace the component. Refer to LT-42, "
Trouble Diagnosis Chart by Symp-
tom" .
5. Does the auto light system operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckINFOID:0000000003533377
SETTING CHANGE FUNCTIONS
• Sensitivity of auto light system can be adjusted using CONSULT-II. Refer to LT-40, "CONSULT-II Function
(BCM)" .
CHECK POWER SUPPLY AND GROUND CIRCUIT FOR BCM
Refer to BCS-15, "BCM Power Supply and Ground Circuit Inspection" .
CHECK POWER SUPPLY AND GROUND CIRCUIT FOR IPDM E/R
Refer to PG-26, "IPDM E/R Power/Ground Circuit Inspection" .
CONSULT-II Function (BCM)INFOID:0000000003533378
Refer to BCS-16, "CONSULT-II Function (BCM)".
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure" .
WORK SUPPORT
Work Support Setting Item
• Delay timer setting can be selected and set from eight modes.
• Sensitivity of auto light can be selected and set from four modes.
DATA MONITOR
Display Item List
Work item Description
CUSTOM A/LIGHT SETTINGAuto light sensitivity can be changed in this mode. Sensitivity can be adjusted in four modes.
• MODE 1 (Normal-default)/ MODE 2 (Desensitized)/MODE 3 (Sensitive)/MODE4 (Insensitive)
ILL DELAY SETAuto light delay off timer period can be changed in this mode. Selects auto light delay off timer period
among eight modes.
• MODE 1 (45 sec.)/MODE 2 (OFF)/MODE 3 (30 sec.)/MODE 4 (60 sec.)/MODE 5 (90 sec.)/MODE
6 (120 sec.)/MODE 7 (150 sec.)/MODE 8 (180 sec.)
Monitor item Contents
IGN ON SW "ON/OFF" Displays "IGN position (ON)/OFF, ACC position (OFF)" judged from the ignition switch signal.
ACC ON SW "ON/OFF" Displays "ACC (ON)/OFF, Ignition OFF (OFF)" status judged from ignition switch signal.
HI BEAM SW "ON/OFF"Displays status (high beam switch: ON/Others: OFF) of high beam switch judged from lighting
switch signal.
HEAD LAMP SW 1 "ON/OFF"Displays status (headlamp switch 1: ON/Others: OFF) of headlamp switch 2 judged from light-
ing switch signal.
HEAD LAMP SW 2 "ON/OFF"Displays status (headlamp switch 2: ON/Others: OFF) of headlamp switch 2 judged from light-
ing switch signal.
LIGHT SW 1ST "ON/OFF"Displays status (lighting switch 1st position: ON/Others: OFF) of lighting switch judged from
lighting switch signal.

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

HEADLAMP AIMING CONTROL
LT-45
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HEADLAMP AIMING CONTROL
System DescriptionINFOID:0000000003533384
The headlamp aiming system is controlled by the headlamp aiming switch.
Power is supplied at all times
• to ignition relay, located in the IPDM E/R (intelligent power distribution module engine room), and
• through 50A fusible link (letter f , located in the fuse and fusible link box)
• to BCM (body control module) terminal 70, and
• to headlamp low relay, located in the IPDM E/R (intelligent power distribution module engine room), and
• through 20A fuse (No. 53, located in the IPDM E/R)
• to CPU (central processing unit) of the IPDM E/R.
With the ignition switch in the ON or START position, power is supplied
• to ignition relay, located in the IPDM E/R, and
• through 10A fuse (No. 59, located in the fuse and relay box)
• to BCM terminal 38.
When the ignition switch is in the ACC or ON position, power is supplied
• through 10A fuse [No. 4, located in the fuse block (J/B)]
• to BCM terminal 11.
When the lighting switch is in the 2ND position or AUTO position (auto lights ON), the headlamp low relay
(located in the IPDM E/R) is energized. When energized, power is supplied
• through 15A fuse (No. 41, located in the IPDM E/R)
• through IPDM E/R terminal 26
• to front combination lamp LH and RH (headlamp aiming motor) terminal 8.
Ground is supplied
• to front combination lamp LH and RH (headlamp aiming motor) terminal 4
• through grounds E9, E15 and E24, and
• to front combination lamp LH and RH (headlamp aiming motor) terminal 7
• through headlamp aiming switch terminal 1
• through headlamp aiming switch terminal 2
• through grounds M57, M61 and M79.
With power and ground supplied, headlamp aiming motors operate according to the aiming switch position.

LT-46
< SERVICE INFORMATION >
HEADLAMP AIMING CONTROL
Wiring Diagram - H/AIM -
INFOID:0000000003533385
WKWA3650E

HEADLAMP AIMING CONTROL
LT-47
< SERVICE INFORMATION >
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Headlamp Aiming SwitchINFOID:0000000003533386
REMOVAL AND INSTALLATION
Removal
1. Remove cluster lid A. Refer to IP-10.
WKWA2488E