2006 INFINITI QX56 headlamp

LT-48
AUTO LIGHT SYSTEM
Revision: November 20092006 QX56
System DescriptionEKS00B8S
Automatically turns on/off the parking lamps and the headlamps in accordance with ambient light.
Timing for when the lamps turn on/off can be selected using four modes.
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- 5 5 , "
SETTING CHANGE FUNCTIONS" .
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, "COMBINATION SWITCH READING FUNCTION" .
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 head-
lamp 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 DescriptionEKS00B8T
Refer to LAN-26, "CAN COMMUNICATION" .
Major Components and FunctionsEKS00B8U
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)

LT-54
AUTO LIGHT SYSTEM
Revision: November 20092006 QX56
NOTE:
Optical sensor must be completely subjected to work lamp light. If the optical sensor is insufficiently illumi-
nated, the measured value may not satisfy standard.
Terminals and Reference Values for IPDM E/REKS00B8Y
34 L Combination switch output 3 ONLighting, turn, wiper OFF
Wiper dial position 4
35 O/B Combination switch output 2 ONLighting, turn, wiper OFF
Wiper dial position 4
36 R/W Combination switch output 1
38 W/L Ignition switch (ON) ON —Battery voltage
39 L CAN-H —— —
40 P CAN-L —— —
43 R/B Back door latch (door ajar
switch) signal OFFBack door
latch (door
ajar switch) ON (open)
0V
OFF (closed) Battery voltage
47 SB Front door switch LH signal OFF Front door
switch LH ON (open)
0V
OFF (closed) Battery voltage
48 R/Y Rear door switch LH signal OFF Rear door
switch LH ON (open)
0V
OFF (closed) Battery voltage
58 W/R Optical sensor signal ONWhen optical sensor is illumi-
nated
3.1V or more
Note
When optical sensor is not illumi-
nated 0.6V or less
67 B Ground ON— 0V
70 W/B Battery power supply OFF— Battery voltage
Terminal
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
SKIA5291E
SKIA5292E
Terminal
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
38 B Ground ON— 0V
39 L CAN-H —— —
40 P CAN-L —— —
52 L Headlamp low (LH) ON Lighting switch
2ND positionOFF
0V
ON Battery voltage
54 R/Y Headlamp low (RH) ON Lighting switch
2ND positionOFF
0V
ON Battery voltage
55 G Headlamp high (LH) ON Lighting switch
HIGH or PASS
positionOFF
0V
ON Battery voltage

AUTO LIGHT SYSTEMLT-55
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Revision: November 2009 2006 QX56
1 USA
2 Canada
How to Proceed With Trouble DiagnosisEKS00B8Z
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT- 4 8 , "
System Description" .
3. Carry out the Preliminary Check. Refer to LT- 5 5 , "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction. Refer to LT- 6 2 , "
Trouble Diagnosis Chart
by Symptom" .
5. Does the auto light system operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckEKS00B90
SETTING CHANGE FUNCTIONS

Sensitivity of auto light system can be adjusted using CONSULT-II. Refer to LT- 5 8 , "WORK SUPPORT" .
CHECK POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown fuses or fusible link.
Refer to LT- 5 0 , "
Wiring Diagram — AUTO/L —" .
OK or NG
OK >> GO TO 2.
NG >> If fuse or fusible link is blown, be sure to eliminate cause of malfunction before installing new fuse or fusible link. Refer to PG-4, "
POWER SUPPLY ROUTING CIRCUIT" .
56L/W1
Y2Headlamp high (RH) ON Lighting switch
HIGH or PASS
positionOFF
0V
ON Battery voltage
57 R/L Parking, license, and tail
lamp ON
Lighting switch
1ST position OFF
0V
ON Battery voltage
59 B Ground ON— 0V
Te r m i n a l
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
Unit
Power sourceFuse and fusible link No.
BCM Battery
f
Ignition switch ON or START position 59
IPDM E/R Battery 34
35
37
40
41
53

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LT
Revision: November 2009 2006 QX56ACTIVE TEST
Operation Procedure
1. Touch "HEAD LAMP" on "SELECT TEST ITEM" screen.
2. Touch "ACTIVE TEST" on "SELECT DIAG MODE" screen.
3. Touch item to be tested and check operation of the selected item.
4. During the operation check, touching "BACK" deactivates the operation.
Display Item List
SELF-DIAGNOSTIC RESULTS
Operation Procedure
1. Touch "BCM" on "SELECT TEST ITEM" screen.
2. Touch "SELF-DIAG RESULTS" on "SELECT DIAG MODE" screen.
3. Self-diagnostic results are displayed.
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 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
sensor signal.
Monitor item
Contents
Test itemDescription
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.

AUTO LIGHT SYSTEMLT-61
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Revision: November 2009 2006 QX56
4. Select the desired part to be diagnosed on the "SELECT DIAG
MODE" screen.
DATA MONITOR
Operation Procedure
1. Touch "DATA MONITOR" on "SELECT DIAG MODE" screen.
2. Touch "ALL SIGNALS", "MAIN SIGNALS" or "SELECTION FROM MENU" on the "SELECT MONITOR
ITEM" screen.
3. Touch "START".
4. Touch the required monitoring item on "SELECTION FROM MENU". In "ALL SIGNALS", all items are monitored. In "MAIN SIGNALS", predetermined items are monitored.
5. Touch "RECORD" while monitoring to record the status of the item being monitored. To stop recording, touch "STOP".
All Items, Main Items, Select Item Menu
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
Operation Procedure
1. Touch "ACTIVE TEST" on "SELECT DIAG MODE" screen.
2. Touch item to be tested, and check operation.
3. Touch "START".
4. Touch "STOP" while testing to stop the operation.
BCIA0031E
ALL SIGNALS All items will be monitored.
MAIN SIGNALS Monitor the predetermined item.
SELECTION FROM MENU Select any item for monitoring.
Item name CONSULT-II
screen display Display or
unit Monitor item selection
Description
ALL
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
Parking, license plate
and tail lamps request TAIL&CLR REQ ON/OFF
×× ×Signal status input from BCM
Headlamp low beam
request HL LO REQ ON/OFF
×× × Signal status input from BCM
Headlamp high beam
request HL HI REQ ON/OFF
×× × Signal status input from BCM
Front fog lamps request FR FOG REQ ON/OFF ×× ×Signal status input from BCM
Test itemCONSULT-II screen display Description
Tail lamp relay output TAIL LAMPAllows tail lamp relay to operate by switching operation ON-OFF at
your option.

LT-62
AUTO LIGHT SYSTEM
Revision: November 20092006 QX56
Trouble Diagnosis Chart by SymptomEKS00B93
Lighting Switch InspectionEKS00B94
1. CHECK LIGHTING SWITCH INPUT SIGNAL
With CONSULT-II
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- 1 0 3 , "
Combination Switch Inspection" .
OK or NG
OK >> Inspection End.
NG >> Check lighting switch. Refer to LT- 1 0 3 , "
Combination
Switch Inspection" .
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 output Allows fog lamp relay to operate by switching operation ON-OFF at
your option.
Test item
CONSULT-II screen display Description
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- 5 8 , "WORK SUPPORT" .

Refer to LT- 6 2 , "Lighting Switch Inspection" .

Refer to LT- 6 3 , "Optical Sensor System Inspection" .
If above systems are normal, replace BCM. Refer to BCS-20, "
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- 5 8 , "WORK SUPPORT" .

Refer to LT- 6 3 , "Optical Sensor System Inspection" .
If above systems are normal, replace BCM. Refer to BCS-20, "
BCM" .
Auto light adjustment system will not operate. (Lighting switch
AUTO, 1st position and 2nd position operate normally.)

Refer to LT- 6 3 , "Optical Sensor System Inspection" .
If above system is normal, replace BCM. Refer to BCS-20, "
BCM" .
Auto light adjustment system will not operate.

CAN communication line to BCM inspection. Refer to BCS-13,
"CAN Communication Inspection Using CONSULT-II (Self-Diagno-
sis)" .
Shut off delay feature will not operate.

CAN communication line inspection between BCM and combina-
tion meter. Refer to BCS-13, "
CAN Communication Inspection
Using CONSULT-II (Self-Diagnosis)" .

Refer to BL-31, "Door Switch Check" .
If above system is normal, replace BCM. Refer to BCS-20, "
BCM" .
When lighting switch is in
AUTO position: AUTO LIGHT SW ON
SKIA4196E

HEADLAMP AIMING CONTROLLT-65
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HEADLAMP AIMING CONTROLPFP:26010
System DescriptionEKS00B97
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-66
HEADLAMP AIMING CONTROL
Revision: November 20092006 QX56
Wiring Diagram — H/AIM —EKS00B98
WKWA3650E