2004 INFINITI QX56 high beam

LAN-14
[CAN]
CAN COMMUNICATION
Revision: August 20072004 QX56
A/C switch/indicator signalTR
RT
Cooling fan speed request signal T R R
Position light request signal R T R
Low beam request signal T R
Low beam status signal RT
High beam request signal R T R
High beam status signal RT
Front fog light request signal T R
Day time running light request
signalTR
Vehicle speed signalR RRT
RRR R T R R R
Sleep wake up signal R T R
Door switch signal R R R T R
Turn indicator signal R T
Key fob ID signal R T
Key fob door unlock signal R T
Buzzer output signalRT
TR
Fuel level sensor signal R T
Malfunction indicator lamp signal T R
Fuel level low warning signal T R
Front wiper request signal R T R
Front wiper stop position signal R T
Rear window defogger switch sig-
nalTR R
Rear window defogger control
signalRRRT
Hood switch signalRT
Theft warning horn request signal T R
Horn chirp signalTR
Steering angle sensor signal T R
ABS warning lamp signal R T
VDC OFF indicator lamp signal R R T
SLIP indicator lamp signal R T
Brake warning lamp signal R T
VDC operation signal R T
ABS malfunction signal R TSignals ECM TCMICC
sen-
sorICC
unitDriver
seat
con-
trol
unitCom-
bina-
tion
mete
rDis-
play
con-
trol
unitBCMStee r-
ing
angle
sen-
sorFront
air
con-
trolTran s -
fer
con-
trol
unitABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)IPD
M
E/R

LT-1
LIGHTING SYSTEM
K ELECTRICAL
CONTENTS
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Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 4
General precautions for service operations ............. 5
Wiring Diagrams and Trouble Diagnosis .................. 5
HEADLAMP (FOR USA) ............................................ 6
Component Parts and Harness Connector Location ..... 6
System Description .................................................. 6
OUTLINE ............................................................... 6
XENON HEADLAMP ............................................. 7
BATTERY SAVER CONTROL .............................. 8
AUTO LIGHT OPERATION ................................... 8
VEHICLE SECURITY SYSTEM (PANIC ALARM) ..... 8
CAN Communication System Description ................ 8
Schematic ................................................................ 9
Wiring Diagram — H/LAMP — ............................... 10
Terminals and Reference Values for BCM ............. 14
Terminals and Reference Values for IPDM E/R ..... 15
How to Proceed With Trouble Diagnosis ................ 15
Preliminary Check .................................................. 16
CHECK POWER SUPPLY AND GROUND CIR-
CUIT .................................................................... 16
CONSULT-II Function (BCM) ................................. 18
CONSULT-II OPERATION .................................. 18
WORK SUPPORT ............................................... 19
DATA MONITOR ................................................. 19
ACTIVE TEST ..................................................... 20
SELF-DIAGNOSTIC RESULTS .......................... 20
CONSULT-II Function (IPDM E/R) ......................... 21
CONSULT-II OPERATION .................................. 21
DATA MONITOR ................................................. 22
ACTIVE TEST ..................................................... 22
Headlamp HI Does Not Illuminate (Both Sides) ..... 23
Headlamp HI Does Not Illuminate (One Side) ....... 25
High Beam Indicator Lamp Does Not Illuminate .... 26
Headlamp LO Does Not Illuminate (Both Sides) .... 26
Headlamp LO Does Not Illuminate (One Side) ...... 28
Headlamps Do Not Turn OFF ................................ 29
Aiming Adjustment ................................................. 31LOW BEAM AND HIGH BEAM ........................... 31
Bulb Replacement .................................................. 32
HEADLAMP (OUTER SIDE), FOR LOW BEAM ... 32
HEADLAMP (INNER SIDE), FOR HIGH BEAM ... 32
FRONT PARKING LAMP (INNER OR OUTER) ... 32
FRONT SIDE MARKER LAMP ........................... 32
Removal and Installation ........................................ 33
REMOVAL ........................................................... 33
INSTALLATION ................................................... 33
Disassembly and Assembly .................................... 33
HEADLAMP (FOR CANADA) - DAYTIME LIGHT
SYSTEM - .................................................................. 34
Component Parts and Harness Connector Location ... 34
System Description ................................................. 35
OUTLINE ............................................................. 35
DAYTIME LIGHT OPERATION ........................... 35
COMBINATION SWITCH READING FUNCTION ... 35
AUTO LIGHT OPERATION ................................. 35
CAN Communication System Description .............. 35
Schematic ............................................................... 36
Wiring Diagram — DTRL — ................................... 37
Terminals and Reference Values for BCM .............. 41
How to Proceed With Trouble Diagnosis ................ 42
Preliminary Check .................................................. 42
CHECK BCM CONFIGURATION ........................ 42
INSPECTION FOR POWER SUPPLY AND
GROUND CIRCUIT ............................................. 42
INSPECTION PARKING BRAKE SWITCH CIR-
CUIT .................................................................... 43
CONSULT-II Functions ........................................... 44
Daytime Light Control Does Not Operate Properly
(Normal Headlamps Operate Properly) .................. 44
Aiming Adjustment .................................................. 46
Bulb Replacement .................................................. 46
Removal and Installation ........................................ 46
Disassembly and Assembly .................................... 46
AUTO LIGHT SYSTEM ............................................. 47
Component Parts and Harness Connector Location ... 47
System Description ................................................. 48
OUTLINE ............................................................. 48

HEADLAMP (FOR USA)
LT-7
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to combination meter terminal 8, and

through 50A fusible link (letter f , located in the fuse and fusible link box)

to BCM terminal 70.
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. 14, located in the fuse block (J/B)]

to combination meter terminal 24, and

through 10A fuse (No. 59, located in the fuse and relay box)

to BCM terminal 38.
Ground is supplied

to BCM terminal 67 and

to combination meter terminal 17

through grounds M57, M61 and M79, and

to IPDM E/R terminals 38 and 59

through grounds E9, E15 and E24.
Low Beam Operation
With the lighting switch in 2ND position, the BCM receives input requesting the headlamps to illuminate. This
input is communicated to the IPDM E/R across the CAN communication lines. The CPU of the IPDM E/R con-
trols the headlamp low relay coil. When energized, this relay directs power

through 15A fuse (No. 41, located in the IPDM E/R)

through IPDM E/R terminal 54

to front combination lamp RH terminal 5, and

through 15A fuse (No. 40, located in the IPDM E/R)

through IPDM E/R terminal 52

to front combination lamp LH terminal 5.
Ground is supplied

to front combination lamp LH and RH terminal 1

through grounds E9, E15 and E24.
With power and ground supplied, low beam headlamps illuminate.
High Beam Operation/Flash-to-Pass Operation
With the lighting switch in 2ND position and placed in HIGH or PASS position, the BCM receives input request-
ing the headlamp high beams to illuminate. This input is communicated to the IPDM E/R across the CAN com-
munication lines. The CPU of the combination meter controls the ON/OFF status of the HIGH BEAM indicator.
The CPU of the IPDM E/R controls the headlamp high relay coil. When energized, this relay directs power

through 10A fuse (No. 34, located in the IPDM E/R)

through IPDM E/R terminal 56

to front combination lamp RH terminal 6, and

through 10A fuse (No. 35, located in the IPDM E/R)

through IPDM E/R terminal 55

to front combination lamp LH terminal 6.
Ground is supplied

to front combination lamp LH and RH terminal 2

through grounds E9, E15 and E24.
With power and ground supplied, the high beam headlamps illuminate.
XENON HEADLAMP
Xenon type headlamp is adopted to the low beam headlamps. Xenon bulbs do not use a filament. Instead,
they produce light when a high voltage current is passed between two tungsten electrodes through a mixture
of xenon (an inert gas) and certain other metal halides. In addition to added lighting power, electronic control
of the power supply gives the headlamps stable quality and tone color.
Following are some of the many advantages of the xenon type headlamp.

LT-8
HEADLAMP (FOR USA)
Revision: August 20072004 QX56

The light produced by the headlamps is a white color comparable to sunlight that is easy on the eyes.

Light output is nearly double that of halogen headlamps, affording increased area of illumination.

The light features a high relative spectral distribution at wavelengths to which the human eye is most sen-
sitive. This means that even in the rain, more light is reflected back from the road surface toward the vehi-
cle, for added visibility.

Power consumption is approximately 25 percent less than halogen headlamps, reducing battery load.
BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the 2ND position (ON), and the ignition switch is turned
from ON or ACC to OFF, the battery saver control feature is activated.
Under this condition, the headlamps remain illuminated for 5 minutes, unless the combination switch (lighting
switch) position is changed. If the combination switch (lighting switch) position is changed, then the headlamps
are turned off.
AUTO LIGHT OPERATION
Refer to LT- 4 8 , "System Description" for auto light operation.
VEHICLE SECURITY SYSTEM (PANIC ALARM)
The vehicle security system (panic alarm) will flash the high beams if the system is triggered. Refer to BL-48,
"Panic Alarm Operation" .
CAN Communication System DescriptionEKS0079R
Refer to LAN-5, "CAN COMMUNICATION" .

HEADLAMP (FOR USA)
LT-19
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4. Touch “HEAD LAMP” on “SELECT TEST ITEM” screen.
WORK SUPPORT
Operation Procedure
1. Touch “HEAD LAMP” on “SELECT TEST ITEM” screen.
2. Touch “WORK SUPPORT” on “SELECT DIAG MODE” screen.
3. Touch item on “SELECT WORK ITEM” screen.
4. Touch “START”.
5. Touch “CHANGE SETT”.
6. The setting will be changed and “CUSTOMIZING COMPLETED” will be displayed.
7. Touch “END”.
Display Item List
DATA MONITOR
Operation Procedure
1. Touch “HEAD LAMP” on “SELECT TEST ITEM” screen.
2. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
3. Touch either “ALL SIGNALS” or “SELECTION FROM MENU” on the “SELECT MONITOR ITEM" screen.
4. Touch “START”.
5. When “SELECTION FROM MENU” is selected, touch individual items to be monitored. When “ALL SIG-
NALS” is selected, all the items will be monitored.
6. Touch “RECORD” while monitoring, then the status of the monitored item can be recorded. To stop
recording, touch “STOP”.
Display Item List
LKIA0183E
Item Description CONSULT-II Factory setting
BATTERY SAVER SETExterior lamp battery saver control mode can be changed
in this mode. Selects exterior lamp battery saver control
mode between ON/OFF.ON×
OFF —
ALL SIGNALS Monitors all the signals.
SELECTION FROM MENU Selects and monitors individual signal.
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.

LT-22
HEADLAMP (FOR USA)
Revision: August 20072004 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 "EXTERNAL LAMPS" on "SELECT TEST ITEM" screen.
3. Touch item to be tested, and check operation.
4. Touch “START”.
5. 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 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
requestHL LO REQ ON/OFF×× ×Signal status input from BCM
Headlamp high beam
requestHL HI REQ ON/OFF×× ×Signal status input from BCM
Daytime lights request DTRL REQ ON/OFF×–×Signal status input from BCM
Front fog lamps request FR FOG REQ ON/OFF×× ×Signal status input from BCM

HEADLAMP (FOR USA)
LT-23
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Headlamp HI Does Not Illuminate (Both Sides)EKS007A0
1. CHECK COMBINATION SWITCH INPUT SIGNAL
Select “BCM” on CONSULT-II. With “HEAD LAMP” data monitor,
make sure “HI BEAM SW” turns ON-OFF linked with operation of
lighting switch.
OK or NG
OK >> GO TO 2.
NG >> Check lighting switch. Refer to LT-100, "
Combination
Switch Inspection" .
2. HEADLAMP ACTIVE TEST
1. Select “IPDM E/R” on CONSULT-II, and select “ACTIVE TEST”
on “SELECT DIAG MODE” screen.
2. Select “EXTERNAL LAMPS” on “SELECT TEST ITEM” screen.
3. Touch “HI” on "ACTIVE TEST" screen.
4. Make sure headlamp high beam operates.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.
3. CHECK IPDM E/R
1. Select “IPDM E/R” on CONSULT-II, and select “DATA MONI-
TOR” on “SELECT DIAG MODE” screen.
2. Make sure “HL LO REQ” and “HL HI REQ” turns ON when light-
ing switch is in HIGH position.
OK or NG
OK >> Replace IPDM E/R. Refer to PG-29, "Removal and
Installation of IPDM E/R" .
NG >> Replace BCM. Refer to BCS-19, "
Removal and Installa-
tion of BCM" .
Test item CONSULT-II screen display Description
Headlamp relay (HI, LO) out-
put
EXTERNAL 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 (FOG)
outputAllows fog lamp relay (FOG) to operate by switching operation ON-
OFF at your option.
Tail lamp relay outputAllows tail lamp relay to operate by switching operation ON-OFF at
your option.
When lighting switch is in
HIGH position: HI BEAM SW ON
SKIA4193E
Headlamp high beam should operate.
WKIA1438E
When lighting switch is in
HIGH position: HL LO REQ ON
: HL HI REQ ON
SKIA5775E

LT-24
HEADLAMP (FOR USA)
Revision: August 20072004 QX56
4. CHECK HEADLAMP INPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect front combination lamp RH and LH connectors.
3. Turn ignition switch ON.
4. Select “IPDM E/R” on CONSULT-II, and select “ACTIVE TEST”
on “SELECT DIAG MODE” screen.
5. Select “EXTERNAL LAMPS” on “SELECT TEST ITEM” screen.
6. Touch “HI” on "ACTIVE TEST" screen.
7. When headlamp high beam is operating, check voltage between
front combination lamp RH and LH harness connector and
ground.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. CHECK HEADLAMP CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between IPDM E/R harness connector E123
terminal 56 (L/W) and front combination lamp RH harness con-
nector E107 terminal 6 (L/W).
4. Check continuity between IPDM E/R harness connector E123
terminal 55 (G) and front combination lamp LH harness connec-
tor E11 terminal 6 (G).
OK or NG
OK >> Replace IPDM E/R. Refer to PG-29, "Removal and Installation of IPDM E/R" .
NG >> Repair harness or connector.
6. CHECK HEADLAMP GROUND
1. Check continuity between front combination lamp RH harness
connector E107 terminal 2 (B) and ground.
2. Check continuity between front combination lamp LH harness
connector E11 terminal 2 (B) and ground.
OK or NG
OK >> Check front combination lamp connector for damage or
poor connection. Repair as necessary.
NG >> Repair harness or connector.
Front combination lamp
(–) Voltage (+)
ConnectorTe r m i n a l
(wire color)
RH E107 6 (L/W)
Ground Battery voltage
LH E11 6 (G)
WKIA1852E
56 (L/W) - 6 (L/W) : Continuity should exist.
55 (G) - 6 (G) : Continuity should exist.
WKIA1853E
2 (B) - Ground : Continuity should exist.
2 (B) - Ground : Continuity should exist.
WKIA1854E