light INFINITI QX56 2006 Factory Service Manual

LT-46
HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
Revision: November 20092006 QX56
Aiming AdjustmentEKS00D6C
Refer to LT- 2 9 , "Aiming Adjustment" .
Bulb ReplacementEKS00D6D
Refer to LT- 3 0 , "Bulb Replacement" .
Removal and InstallationEKS00D6E
Refer to LT- 3 1 , "Removal and Installation" .
Disassembly and AssemblyEKS00D6F
Refer to LT- 3 2 , "Disassembly and Assembly" .

AUTO LIGHT SYSTEMLT-47
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AUTO LIGHT SYSTEMPFP:28491
Component Parts and Harness Connector LocationEKS00B8R
WKIA3552E

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)

AUTO LIGHT SYSTEMLT-49
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Revision: November 2009 2006 QX56
SchematicEKS00B8V
WKWA3646E

LT-50
AUTO LIGHT SYSTEM
Revision: November 20092006 QX56
Wiring Diagram — AUTO/L —EKS00B8W
WKWA3647E

AUTO LIGHT SYSTEMLT-51
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WKWA2486E

LT-52
AUTO LIGHT SYSTEM
Revision: November 20092006 QX56
WKWA3649E

AUTO LIGHT SYSTEMLT-53
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Terminals and Reference Values for BCMEKS00B8X
Te r m i n a l
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
2 SB Combination switch input 5 ON Lighting, turn, wiper OFF
Wiper dial position 4
3 G/Y Combination switch input 4 ON Lighting, turn, wiper OFF
Wiper dial position 4
4 Y Combination switch input 3 ON Lighting, turn, wiper OFF
Wiper dial position 4
5 G/B Combination switch input 2 ONLighting, turn, wiper OFF
Wiper dial position 4
6 V Combination switch input 1
12 R/L Front door switch RH signal OFF Front door
switch RH ON (open)
0V
OFF (closed) Battery voltage
13 GR Rear door switch RH OFFRear door
switch RH ON (open)
0V
OFF (closed) Battery voltage
18 P Sensor ground ON— 0V
32 R/G Combination switch output 5 ON Lighting, turn, wiper OFF
Wiper dial position 4
33 R/Y Combination switch output 4 ON Lighting, turn, wiper OFF
Wiper dial position 4
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E

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
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