2011 INFINITI QX56 headlamp

EC-494
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
ELECTRICAL LOAD SIGNAL
>> INSPECTION END
3.CHECK HEADLAMP SYSTEM
Refer to EXL-59, "
Work Flow".
>> INSPECTION END
4.CHECK HEATER FAN CONTROL SYSTEM
Refer to HAC-60, "
Work Flow".
>> INSPECTION END
Revision: 2010 May2011 QX56

EXL-1
DRIVER CONTROLS
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CONTENTS
EXTERIOR LIGHTING SYSTEM
XENON TYPE
PRECAUTION ................ ...............................
5
PRECAUTIONS .............................................. .....5
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
5
SYSTEM DESCRIPTION ..............................6
COMPONENT PARTS ................................... .....6
EXTERIOR LIGHTING SYSTEM .................................6
EXTERIOR LIGHTING SYSTEM : Component
Parts Location ..................................................... ......
6
EXTERIOR LIGHTING SYSTEM :
Component Description ............................................
7
FRONT COMBINATION LAMP ............................. ......8
FRONT COMBINATION LAMP : Xenon Head-
lamp ..........................................................................
8
FRONT COMBINATION LAMP : HID control unit ......9
FRONT COMBINATION LAMP : High Beam Sole-
noid ...........................................................................
9
FRONT COMBINATION LAMP : Aiming Motor ........9
FRONT COMBINATION LAMP : Swivel Actuator ......9
SYSTEM .............................................................10
HEADLAMP SYSTEM ...............................................10
HEADLAMP SYSTEM : Syst em Diagram ...............10
HEADLAMP SYSTEM : System Description ....... ....10
HEADLAMP SYSTEM : Fail-safe ............................10
AUTO LIGHT SYSTEM ..... ........................................11
AUTO LIGHT SYSTEM : System Diagram ......... ....11
AUTO LIGHT SYSTEM : System Description (For
CANADA) ................................................................
11
AUTO LIGHT SYSTEM : System Description (Ex-
cept for CANADA) ...................................................
12
DAYTIME RUNNING LIGHT SYSTEM ......................14
DAYTIME RUNNING LIGH T SYSTEM : System
Diagram ............................................................... ....
14
DAYTIME RUNNING LIGHT SYSTEM : System
Description ........................................................... ....
14
ACTIVE ADAPTIVE FRONT-LIGHTING SYSTEM ....14
ACTIVE ADAPTIVE FRONT-LIGHTING SYSTEM
: System Diagram ................................................ ....
15
ACTIVE ADAPTIVE FRONT-LIGHTING SYSTEM
: System Description ................................................
15
ACTIVE ADAPTIVE FRONT-LIGHTING SYSTEM
: Fail-Safe ................................................................
17
HEADLAMP AIMING CONTROL (MANUAL) ...........17
HEADLAMP AIMING CO NTROL (MANUAL) :
System Description .............................................. ....
18
TURN SIGNAL AND HAZARD WARNING LAMP
SYSTEM .....................................................................
18
TURN SIGNAL AND HAZARD WARNING LAMP
SYSTEM : System Diagram ................................ ....
18
TURN SIGNAL AND HAZARD WARNING LAMP
SYSTEM : System Description ................................
18
PARKING, LICENSE PLATE, SIDE MARKER AND
TAIL LAMP SYSTEM ............................................. ....
18
PARKING, LICENSE PLATE, SIDE MARKER
AND TAIL LAMP SYSTEM : System Diagram ........
18
PARKING, LICENSE PLATE, SIDE MARKER
AND TAIL LAMP SYSTEM : System Description ....
19
PARKING, LICENSE PLATE, SIDE MARKER
AND TAIL LAMP SYSTEM : Fail-safe .....................
19
FRONT FOG LAMP SYSTEM ............................... ....19
FRONT FOG LAMP SYSTEM : System Diagram ....20
FRONT FOG LAMP SYSTEM : System Descrip-
tion ....................................................................... ....
20
FRONT FOG LAMP SYSTEM : Fail-Safe ...............20
EXTERIOR LAMP BATTERY SAVER SYSTEM ... ....20
EXTERIOR LAMP BATTERY SAVER SYSTEM :
System Diagram ......................................................
20
Revision: 2010 May2011 QX56

EXL-2
EXTERIOR LAMP BATTERY SAVER SYSTEM :
System Description .................................................
21
DIAGNOSIS SYSTEM (BCM) ............................22
COMMON ITEM ..................................................... ...22
COMMON ITEM : CONSULT-III Function (BCM -
COMMON ITEM) ................................................. ...
22
HEADLAMP ........................................................... ...23
HEADLAMP : CONSULT-III Function (BCM -
HEAD LAMP) ..........................................................
23
FLASHER ............................................................... ...25
FLASHER : CONSULT-III Function (BCM -
FLASHER) ..............................................................
25
DIAGNOSIS SYSTEM (IPDM E/R) ....................27
Diagnosis Description .......................................... ...27
CONSULT-III Function (IPDM E/R) ........................29
DIAGNOSIS SYSTEM (AFS) .............................32
CONSULT-III Function (ADAPTIVE LIGHT) ........ ...32
ECU DIAGNOSIS INFORMATION ..............34
BCM, IPDM E/R .............................................. ...34
List of ECU Reference ......................................... ...34
AFS CONTROL UNIT ........................................35
Reference Value .................................................. ...35
Fail-Safe .................................................................38
DTC Inspection Priority Chart .................................39
DTC Index ..............................................................39
WIRING DIAGRAM .....................................40
EXTERIOR LIGHTING SYSTEM .................... ...40
Wiring Diagram .................................................... ...40
BASIC INSPECTION ...................................59
DIAGNOSIS AND REPAIR WORKFLOW ...... ...59
Work Flow ............................................................ ...59
INSPECTION AND ADJUSTMENT ...................61
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT (AFS CONTROL UNIT) .............. ...
61
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT (AFS CONTROL UNIT) : De-
scription ..................................................................
61
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT (AFS CONTROL UNIT) : Special
Repair Requirement ...............................................
61
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT (HEIGHT SENSOR) ................... ...
61
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT (HEIGHT SENSOR) : Descrip-
tion ....................................................................... ...
61
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT (HEIGHT SENSOR) : Special
Repair Requirement ............................................. ...
61
LEVELIZER ADJUSTMENT ......................................61
LEVELIZER ADJUSTMENT : Description ..............61
LEVELIZER ADJUSTMENT : Special Repair Re-
quirement ............................................................. ...
61
DTC/CIRCUIT DIAGNOSIS ........................63
B2503, B2504 SWIVEL ACTUATOR ............. ...63
DTC Logic ............................................................ ...63
Diagnosis Procedure ...............................................64
Component Inspection ............................................67
B2513 HEIGHT SENSOR UNUSUAL [FR] .......68
DTC Logic ............................................................ ...68
Diagnosis Procedure ...............................................68
B2514 HEIGHT SENSOR UNUSUAL [RR] .......71
DTC Logic ............................................................ ...71
Diagnosis Procedure ...............................................71
B2516 SHIFT SIGNAL [P, R] ............................74
DTC Logic ............................................................ ...74
Diagnosis Procedure ...............................................74
B2517 VEHICLE SPEED SIGNAL ....................75
DTC Logic ............................................................ ...75
Diagnosis Procedure ...............................................75
B2519 LEVELIZER CALIBRATION ..................76
DTC Logic ............................................................ ...76
Diagnosis Procedure ...............................................76
B2521 ECU CIRCUIT ........................................77
DTC Logic ............................................................ ...77
Diagnosis Procedure ...............................................77
C0126 STEERING ANGLE SENSOR SIGNAL ...80
DTC Logic ............................................................ ...80
Diagnosis Procedure ...............................................80
C0428 STEERING ANGLE SENSOR CALI-
BRATION ...........................................................
81
DTC Logic ............................................................ ...81
Diagnosis Procedure ...............................................81
U1000 CAN COMM CIRCUIT ............................82
Description ........................................................... ...82
DTC Logic ...............................................................82
Diagnosis Procedure ...............................................82
U1010 CONTROL UNIT (CAN) .........................83
DTC Logic ............................................................ ...83
Diagnosis Procedure ...............................................83
POWER SUPPLY AND GROUND CIRCUIT .....84
AFS CONTROL UNIT ............................................. ...84
AFS CONTROL UNIT : Diagnosis Procedure .........84
Revision: 2010 May2011 QX56

EXL-3
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EXTERIOR LAMP FUSE ................................ ....85
Diagnosis Procedure ........................................... ....85
HEADLAMP (HI) CIRCUIT .................................86
Component Function Check ................................ ....86
Diagnosis Procedure ...............................................86
HEADLAMP (LO) CIRCUIT ................................88
Component Function Check ................................ ....88
Diagnosis Procedure ...............................................88
XENON HEADLAMP ..........................................90
Diagnosis Procedure ........................................... ....90
HEADLAMP LEVELIZER CIRCUIT ...................91
Component Function Check ................................ ....91
Diagnosis Procedure ...............................................91
HEADLAMP AIMING SYSTEM (MANUAL) .......93
Component Inspection ........................................ ....93
FRONT FOG LAMP CIRCUIT ............................94
Component Function Check ................................ ....94
Diagnosis Procedure ...............................................94
PARKING LAMP CIRCUIT ............................. ....96
Component Function Check ................................ ....96
Diagnosis Procedure ...............................................96
FRONT SIDE MARKER LAMP CIRCUIT ...........98
Component Function Check ................................ ....98
Diagnosis Procedure ...............................................98
TURN SIGNAL LAMP CIRCUIT .........................99
Component Function Check ................................ ....99
Diagnosis Procedure ...............................................99
OPTICAL SENSOR ..........................................102
Component Function Check ................................ ..102
Diagnosis Procedure .............................................102
HAZARD SWITCH .......................................... ..105
Component Function Check ................................ ..105
Diagnosis Procedure .............................................105
AFS SWITCH ....................................................107
Component Function Check ................................ ..107
Diagnosis Procedure .............................................107
Component Inspection ..........................................108
TAIL LAMP CIRCUIT .......................................109
BODY SIDE ........................................................... ..109
BODY SIDE : Component Function Check ...........109
BODY SIDE : Diagnosis Procedure ......................109
BACK DOOR SIDE ................................................ ..110
BACK DOOR SIDE : Component Function Check ..110
BACK DOOR SIDE : Diagnosis Procedure ...........111
LICENSE PLATE LAMP CIRCUIT ...................112
Component Function Check ................................ ..112
Diagnosis Procedure .............................................112
SYMPTOM DIAGNOSIS ............................113
EXTERIOR LIGHTING SYSTEM SYMPTOMS .113
Symptom Table ................................................... ..113
NORMAL OPERATING CONDITION .............116
Description .............................................................116
BOTH SIDE HEADLAMPS DO NOT SWITCH
TO HIGH BEAM ..............................................
117
Description .............................................................117
Diagnosis Procedure .............................................117
BOTH SIDE HEADLAMPS (LO) ARE NOT
TURNED ON ...................................................
118
Description ........................................................... ..118
Diagnosis Procedure .............................................118
PARKING, LICENSE PLATE, SIDE MARKER
AND TAIL LAMPS ARE NOT TURNED ON ...
119
Description .............................................................119
Diagnosis Procedure .............................................119
BOTH SIDE FRONT FOG LAMPS ARE NOT
TURNED ON ...................................................
120
Description ........................................................... ..120
Diagnosis Procedure .............................................120
PERIODIC MAINTENANCE ......................121
HEADLAMP AIMING ADJUSTMENT .............121
description ........................................................... ..121
Aiming Adjustment Procedure ...............................122
FRONT FOG LAMP AIMING ADJUSTMENT .123
Description .............................................................123
Aiming Adjustment Procedure ...............................123
REMOVAL AND INSTALLATION .............125
FRONT COMBINATION LAMP ......................125
Exploded View ..................................................... ..125
Removal and Installation .......................................125
Replacement .........................................................126
Disassembly and Assembly ...................................127
FRONT FOG LAMP ........................................128
Exploded View .......................................................128
Removal and Installation .......................................128
Replacement .........................................................128
SIDE TURN SIGNAL LAMP ............................130
Exploded View .......................................................130
Removal and Installation .......................................130
OPTICAL SENSOR .........................................131
Exploded View .......................................................131
Removal and Installation .......................................131
LIGHTING & TURN SIGNAL SWITCH ...........132
Exploded View .......................................................132
Revision: 2010 May2011 QX56

COMPONENT PARTSEXL-7
< SYSTEM DESCRIPTION > [XENON TYPE]
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*1: With headlamp aiming control system (manual) models
*2: With AFS system models
EXTERIOR LIGHTING SYSTEM : Component DescriptionINFOID:0000000006213888
1. Combination meter 2. BCM
Refer to BCS-4, "
BODY CONTROL
SYSTEM : Compon ent Parts Loca-
tion"
3. Optical sensor
4. IPDM E/R Refer to PCS-4, "
Component Parts
Location"
5. ECM
Refer to EC-16, "
Component Parts
Location"
6. Parking lamp
7. Front turn signal lamp 8. Front fog lamp 9. Headlamp
10. Front side marker lamp 11. Combination switch 12. Headlamp aiming switch*
1
13. Front door switch (driver side) 14.
Steering angle sensor*2
Refer to BRC-10, "Component Parts
Location"
15. License plate lamp
16. Tail lamp 17. Rear turn signal lamp 18. Rear side marker lamp
19. Hazard switch 20. Side turn signal lamp 21. Headlamp swivel actuator
22. Headlamp aiming motor 23. AFS switch*
224.Rear height sensor*2
25.AFS control unit*226.Front height sensor*2
A. Front combination lamp (back) B. View with instrument driver lower
panel (LH)C. Rear suspension member (RH)
D. View with instrument lower cover E. Front suspension arm (RH)
Part Description
BCM Controls the exterior lighting system.
ECM*
1Transmits engine speed signal to AFS control unit. (via CAN communication)
TCM*
1Transmits Shift position signal to AFS control unit. (via CAN communication)
IPDM E/R Controls the integrated relay, and supplies voltage to the load according to the request
from BCM (via CAN communication).
AFS control unit*
1AFS control unit judges the vehicle condition from each signal. AFS control unit con-
trols AFS function and the headlamp aiming.
Combination meter  Outputs the vehicle speed signal (8-pulse) to AFS control unit.
 Blinks the turn signal indicator lamp and outputs the turn signal operating sound with
integrated buzzer according to the request from BCM (via CAN communication).
 Turns the tail lamp indicator lamp and high beam indicator lamp ON according to the
request from BCM (via CAN communication).
 Turns the AFS OFF indicator lamp ON/OFF /blinking according to the request from
AFS control unit (via CAN communication).
Headlamp assembly Xenon bulb Refer to
EXL-8, "
FRONT COMBINATION LAMP : Xenon Headlamp".
HID control unit Refer to EXL-9, "
FRONT COMBINATION LAMP : HID control unit".
High beam solenoid Refer to EXL-9, "
FRONT COMBINATION LAMP : High Beam Solenoid".
Aiming motor Refer to EXL-9, "
FRONT COMBINATION LAMP : Aiming Motor".
Swivel actuator*
1Refer to EXL-9, "FRONT COMBINATION LAMP : Swivel Actuator".
Height sensor*
1
 The height sensor is installed to the front suspension member and rear suspension member.
 The height sensor detects the suspension arm displacement as the vehicle height change.
 The height sensor transmits the height sensor signal to AFS control unit.
NOTE:
The sensor angle of the unloaded vehicle position is the reference value.
Optical sensor Optical sensor converts the outside brightness (lux) to voltage and transmits the opti-
cal sensor signal to BCM.
Revision: 2010 May2011 QX56

EXL-8
< SYSTEM DESCRIPTION >[XENON TYPE]
COMPONENT PARTS
*1: With AFS system models
*
2: With headlamp aiming control system (manual) models
FRONT COMBINATION LAMP
FRONT COMBINATION LAMP : Xenon HeadlampINFOID:0000000006213889
OUTLINE
 The lamp light source is by the arch discharge by
applying high voltage into the xenon gas-filled bulb instead
of the halogen bulb filament.
 Sight becomes more natural and brighter because the amount of light are gained adequately and the color of
light is sunshine-like white.
 The xenon bulb drops the amount of light, repeats blinking, and illuminates in red if the bulb reaches the ser-
vice life.
ILLUMINATION PRINCIPLE
1. Discharging starts in high voltage pulse between bulb elec- trodes.
2. Xenon gas is activated by curr ent between electrodes. Pale light
is emitted.
3. The luminous tube (bulb) temperature elevates. Evaporated halide is activated by discharge. The color of light changes into
white.
NOTE:
 Brightness and the color of light may change slightly immediately after the headlamp turned ON until the xenon bulb becomes sta-
ble. This is not malfunction.
 Illumination time lag may occur between right and left. This is not
malfunction.
PRECAUTIONS FOR TROUBLE DIAGNOSIS
Representative malfunction examples are; "Light does not turn ON", "Light blinks", and "Brightness is inade-
quate." The cause often be the xenon bulb. Such malf unctions, however, are occurred occasionally by HID
control unit malfunction or lamp case malfunction. S pecify the malfunctioning part with diagnosis procedure.
WARNING:
 Never touch the harness, HID control unit, the inside and metal part of lamp when turning the head-
lamp ON or operating the lighting switch.
 Never work with wet hands.
CAUTION:
 Never perform HID control unit circuit diagnosis with a circuit tester or an equivalent.
 Temporarily install the headlamps on the vehicle. Co nnect the battery to the connector (vehicle side)
when checking ON/OFF status.
 Disconnect the battery negative terminal before di sconnecting the lamp socket connector or the har-
ness connector.
 Check for fusing of the fusible link(s), open around connector, short, disconnection if the symptom
is caused by electric error.
NOTE:
 Turn the switch OFF once before turni ng ON, if the ON/OFF is inoperative.
 The xenon bulb drops the amount of light, repeats blinking, and illuminates in red if the bulb reaches the ser-
vice life.
Steering angle sensor*1Transmits steering angle sensor signal to AFS control unit. (via CAN communication)
Combination switch
(Lighting & turn signal switch) Refer to
BCS-7, "
COMBINATION SWITCH READING SYSTEM : System Descrip-
tion".
Door switch Inputs the door switch signal to BCM.
AFS switch*
1 Inputs the AFS switch signal to AFS control unit.
 AFS switch is integrated in triple switch.
Headlamp aiming switch*
2Outputs the aiming motor drive signal to aiming motor.
Hazard switch Inputs the hazard switch signal to BCM. Part Description
JPLIA0421GB
Revision: 2010 May2011 QX56

COMPONENT PARTSEXL-9
< SYSTEM DESCRIPTION > [XENON TYPE]
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FRONT COMBINATION LAMP : HID control unitINFOID:0000000006213890
Headlamp (LO) circuit is connected to HID control unit integrated in the headlamp. Headlamp (LO) circuit turns
xenon headlamp ON.
For the details of HID control unit and the xenon headlamp, refer to EXL-8, "
FRONT COMBINATION LAMP :
Xenon Headlamp".
FRONT COMBINATION LAMP : High Beam SolenoidINFOID:0000000006213891
The high beam solenoid drives the mobile valve shade. And the mobile valve shade switches the high beam
and low beam of headlamp.
 When the headlamp high relay is turned ON, magnetic force is applied to the high beam solenoid (1) by a current. The mobile
valve shade (2) is switched to the high beam position.
 When the headlamp high relay is turned OFF, the current stops.
The mobile valve shade returns to the low beam position automati-
cally.
FRONT COMBINATION LAMP : Aiming MotorINFOID:0000000006213892
The headlamp levelizer adjusts the headlamp light axis upward and downward with the aiming motor inte-
grated in the front combination lamp.
FRONT COMBINATION LAMP : Swivel ActuatorINFOID:0000000006213893
SWIVEL ACTUATOR
The swivel actuator is installed in the headlamp unit. T he swivel actuator consists of the swivel motor and the
swivel position sensor.
SWIVEL MOTOR
 The swivel motor is the two-phase step motor.
 The swivel motor drives headlamp by exciting the two dr ive coils according to the drive signal from AFS con-
trol unit.
 The rotation direction of the swivel motor is changeable by changing the exciting pattern.
SWIVEL POSITION SENSOR
The swivel position sensor detects the headlamp swivel angle to transmit t he swivel position sensor signal to
AFS control unit.
JSLIA0129ZZ
Revision: 2010 May2011 QX56

EXL-10
< SYSTEM DESCRIPTION >[XENON TYPE]
SYSTEM
SYSTEM
HEADLAMP SYSTEM
HEADLAMP SYSTEM : System DiagramINFOID:0000000006213894
HEADLAMP SYSTEM : System DescriptionINFOID:0000000006213895
OUTLINE
Headlamp is controlled by combination switch r
eading function and headlamp control function of BCM, and
relay control function of IPDM E/R.
HEADLAMP (LO) OPERATION
 BCM detects the combination switch conditi on with the combination switch reading function.
 BCM transmits the low beam request signal to IPDM E/R via CAN communication according to the head-
lamp (LO) ON condition.
Headlamp (LO) ON condition- Lighting switch 2ND
- Lighting switch AUTO (auto light function ON judgment)
- Lighting switch AUTO, with the front fog la mp switch ON and the ignition switch ON
- Lighting switch PASS
 IPDM E/R turns the integrated headlamp low relay ON , and turns the headlamp ON according to the low
beam request signal.
HEADLAMP (HI) OPERATION
 BCM transmits the high beam request signal to IPDM E/R and the combination meter via CAN communica- tion according to the headlamp (HI) ON condition.
Headlamp (HI) ON condition
- Lighting switch HI with the lighting switch 2ND or AUTO (auto light function ON judgment)
- Lighting switch PASS
- Lighting switch AUTO, with the front fog lamp swit ch ON, the ignition switch ON and lighting switch HI
 Combination meter turns the high beam indicator lamp ON according to the high beam request signal.
 IPDM E/R turns the integrated headlamp high relay ON , and turns the headlamp ON according to the high
beam request signal.
HEADLAMP SYSTEM : Fail-safeINFOID:0000000006213896
CAN COMMUNICATION CONTROL
When CAN communication with BCM is impossible, IPDM E/R performs fail-safe control. After CAN communi-
cation recovers normally, it also returns to normal control.
If No CAN Communication Is Available With BCM
JMLIA1083GB
Revision: 2010 May2011 QX56