engine INFINITI QX56 2007 Factory Service Manual

LAN-44
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
CAN System Specification Chart
INFOID:0000000003533627
Determine CAN system type from the following specification chart. Then choose the correct diagnosis sheet.
NOTE:
Refer to LAN-14, "
Trouble Diagnosis Procedure" for how to use CAN system specification chart.
X: Applicable
VEHICLE EQUIPMENT IDENTIFICATION INFORMATION
NOTE:
Check CAN system type from the vehicle shape and equipment.
CAN Communication Signal ChartINFOID:0000000003533628
Refer to LAN-13, "How to Use CAN Communication Signal Chart" for how to use CAN communication signal
chart.
TYPE 1/TYPE 2
NOTE:
Refer to LAN-37, "
Abbreviation List" for the abbreviations of the connecting units.
T: Transmit R: Receive
Body typeWagon
Axle 2WD AWD
EngineVK56DE
Transmission A/T
Brake controlVDC
ICC system X X
CAN system type 1234
Diagnosis sheetLAN-57
LAN-58LAN-59LAN-60
CAN communication signal chartLAN-44, "CAN Communication Sig-
nal Chart"
LAN-44, "CAN Communication Sig-
nal Chart"
BKIA0219E
Signal name/Connecting unitECM
TCM
LASER
ICC
ADP
BCM
DISP
HVAC
M&A
STRG
ABS
IPDM-E
A/C compressor request signal TR
Accelerator pedal position signal T R R R
ASCD CRUISE lamp signal T R
ASCD OD cancel request signal T R
ASCD operation signal T R
ASCD SET lamp signal T R
Battery voltage signal T R
Closed throttle position signal T R R
Cooling fan speed request signal TR
Engine coolant temperature signal T R R

TROUBLE DIAGNOSIS
LAN-45
< SERVICE INFORMATION >[CAN]
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Engine speed signal T R R R R R R
Engine status signal T R
Fuel consumption monitor signalTR
RT
ICC steering switch signal T R
Malfunction indicator lamp signal T R
Wide open throttle position signal T R
A/T CHECK indicator lamp signal T R
A/T fluid temperature sensor signal T R
A/T position indicator lamp signal T R R
A/T self-diagnosis signal R T
Current gear position signal T R R
Output shaft revolution signal R T R
P range signal T R R R R
Turbine revolution signal R T R
ICC sensor signal T R
Buzzer output signalTR
TR
ICC OD cancel request signal R R T
ICC operation signal R R T
ICC system display signal T R
System setting signalTR
RT
A/C switch signal R T R
Blower fan motor switch signal R T
Day time running light request signal T R R
Door switch signal R T R R R
Front fog light request signal T R
Front wiper request signal R T R
High beam request signal T R R
Horn chirp signal T R
Ignition switch signal R T R
Key fob door unlock signal R T
Key fob ID signal R T
Key switch signal R T
Low beam request signal T R
Position light request signal T R R
Rear window defogger switch signal T R R
Sleep wake up signal R T R R
Theft warning horn request signal T R
Tire pressure data signal T R
Tire pressure signal T R R
Turn indicator signal T RSignal name/Connecting unit
ECM
TCM
LASER
ICC
ADP
BCM
DISP
HVAC
M&A
STRG
ABS
IPDM-E

TROUBLE DIAGNOSIS
LAN-47
< SERVICE INFORMATION >[CAN]
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Cooling fan speed request signal TR
Engine coolant temperature signal T R R
Engine speed signal T R R R R R R R
Engine status signal T R
Fuel consumption monitor signalTR
RT
ICC steering switch signal T R
Malfunction indicator lamp signal T R
Wide open throttle position signal T R
A/T CHECK indicator lamp signal T R
A/T fluid temperature sensor signal T R
A/T position indicator lamp signal T R R R
A/T self-diagnosis signal R T
Current gear position signal T R R
Output shaft revolution signal R T R R
P range signal T R R R R
Turbine revolution signal R T R
ICC sensor signal T R
Buzzer output signalTR
TR
ICC OD cancel request signal R R T
ICC operation signal R R T
ICC system display signal T R
System setting signalTR
RT
A/C switch signal R T R
Blower fan motor switch signal R T
Day time running light request signal T R R
Door switch signal R T R R R
Front fog light request signal T R
Front wiper request signal R T R
High beam request signal T R R
Horn chirp signal T R
Ignition switch signal R T R
Key fob door unlock signal R T
Key fob ID signal R T
Key switch signal R T
Low beam request signal T R
Position light request signal T R R
Rear window defogger switch signal T R R
Sleep wake up signal R T R R
Theft warning horn request signal T R
Tire pressure data signal T RSignal name/Connecting unit
ECM
TCM
LASER
ICC
ADP
BCM
DISP
HVAC
M&A
STRG
4WD
ABS
IPDM-E

HEADLAMP (FOR USA)
LT-5
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HEADLAMP (FOR USA)
Component Parts and Harness Connector LocationINFOID:0000000003533332
System DescriptionINFOID:0000000003533333
Control of the headlamp system operation is dependent upon the position of the combination switch (lighting
switch). When the lighting switch is placed in the 2ND position, the BCM (body control module) receives input
requesting the headlamps (and tail lamps) illuminate. This input is communicated to the IPDM E/R (intelligent
power distribution module engine room) across the CAN communication lines. The CPU (central processing
unit) of the IPDM E/R controls the headlamp high and headlamp low relay coils. When energized, these relays
direct power to the respective headlamps, which then illuminate.
OUTLINE
Power is supplied at all times
• to ignition relay, located in the IPDM E/R,
• to headlamp high relay, located in the IPDM E/R,
• to headlamp low relay, located in the IPDM E/R,
• through 20A fuse (No. 53, located in the IPDM E/R)
• to CPU of the IPDM E/R, 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. 59, located in the fuse and relay box)
WKIA3463E

HEADLAMP (FOR USA)
LT-21
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- Place vehicle and screen on level surface.
- Ensure there is no load in vehicle other than the driver (or equivalent weight placed in driver's position).
Coolant and engine oil filled to correct level, and fuel tank full.
- Confirm spare tire, jack and tools are properly stowed.
- Aim each headlamp individually and ensure other headlamp beam pattern is blocked from screen.
- Use adjusting screw to perform aiming adjustment
NOTE:
Basic illuminating area for adjustment should be within the range shown on the aiming chart. Adjust head-
lamps accordingly.
LOW BEAM AND HIGH BEAM
1. Turn headlamp low beam on.
2. Use adjusting screw to perform aiming adjustment.
Bulb ReplacementINFOID:0000000003533350
CAUTION:
• Disconnect battery negative terminal before touching xenon bulb or headlamp wiring harness
assembly.
• Turn headlamp switch OFF before disconnecting headlamp harness connector.
• Do not touch bulb by hand right after being turned off. Burning may result.
• Do not touch the glass of bulb directly by hand. Keep grease and other oily substances away from it.
• Do not turn xenon bulb ON when xenon bulb is removed from front combination lamp assembly.
• After installing the bulb, be sure to install the bulb socket securely to ensure watertightness.
A. Right B. Left C. Center of headlamp bulb (H-V point)
D. Cutoff line E. Screen F. Aim evaluation segment
G. Step H. Horizontal center line of headlamp J. 103 mm (4.06 in.)
K. 37 mm (1.46 in.) L. 7.62 m (25 ft.) M. 399 mm (15.71 in.)
N. 133 mm (5.24 in.) P. 53.2 mm (2.09 in.) Q. 466 mm (18.35 in.)
R. 200 mm (7.87 in.) S. RH headlamp aiming screen T. LH headlamp aiming screen
LKIA0809E

LT-24
< SERVICE INFORMATION >
HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
Component Parts and Harness Connector LocationINFOID:0000000003533353
System DescriptionINFOID:0000000003533354
Daytime light system turns on daytime light lamps while driving. Daytime light lamps are not turned on if
engine is activated with parking brake applied. Release parking brake to turn on daytime light lamps. The
WKIA3551E

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
LT-25
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lamps turn off when lighting switch is in the 2ND position or AUTO position (Headlamp is "ON") and when light-
ing switch is in the PASSING position. (Daytime light lamps are not turned off only by parking brake itself.)
A parking brake signal and engine run or stop signal are sent to BCM (body control module) by CAN commu-
nication line.
OUTLINE
Power is supplied at all times
• to ignition relay, located in the IPDM E/R (intelligent power distribution module engine room),
• through 50A fusible link (letter f , located in the fuse and fusible link box)
• to BCM terminal 70,
• through 20A fuse (No. 53, located in the IPDM E/R)
• to CPU (central processing unit) of the IPDM E/R,
• through 10A fuse [No. 19, located in the fuse block (J/B)]
• to combination meter terminal 8, and
• through 10A fuse (No. 45, located in the IPDM E/R)
• to daytime light relay terminals 2 and 5.
When the ignition switch is in ON or START position, power is supplied
• to ignition relay, located in the IPDM E/R,
• through 10A fuse (No. 59, located in the fuse and relay box)
• to BCM terminal 38, and
• through 10A fuse [No. 14, located in the fuse block (J/B)]
• to combination meter terminal 24.
Ground is supplied
• to BCM terminal 67 and
• to combination meter terminal 17
• through grounds M57, M61 and M79.
DAYTIME LIGHT OPERATION
With the engine running, the lighting switch in the OFF or 1ST position and parking brake released, the IPDM
E/R receives input requesting the daytime lights illuminate. This input is communicated across the CAN com-
munication lines. The CPU of the IPDM E/R controls the daytime light relay coil. When energized, this relay
directs power
• through daytime light relay terminal 3
• to front combination lamp LH terminal 2
• through front combination lamp LH terminal 6
• to IPDM E/R terminal 55
• through 10A fuse (No. 35, located in the IPDM E/R)
• through 10A fuse (No. 34, located in the IPDM E/R)
• through IPDM E/R terminal 56
• to front combination lamp RH terminal 6.
Ground is supplied
• to front combination lamp RH terminal 2
• through grounds E9, E15 and E24.
With power and ground supplied, the daytime lights illuminate. The high beam headlamps are now wired in
series and illuminate at a reduced intensity.
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "System Description" .
AUTO LIGHT OPERATION
Refer to LT-34, "System Description" .
CAN Communication System DescriptionINFOID:0000000003533355
Refer to LAN-4, "CAN Communication System" .

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
LT-33
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1. Connect daytime light relay and IPDM E/R connector.
2. Apply parking brake and start engine. Headlamp switch OFF.
3. Select "IPDM E/R" on CONSULT-II. With data monitor, make
sure "DTRL REQ" turns OFF-ON linked with operation of park-
ing brake switch.
OK or NG
OK >> Replace IPDM E/R. Refer to PG-28, "Removal and
Installation of IPDM E/R" .
NG >> GO TO 6.
6.CHECKING CAN COMMUNICATIONS
Select "BCM" on CONSULT-II and perform self-diagnosis for BCM.
Displayed self-diagnosis results
NO DTC>> Replace BCM. Refer to BCS-24, "BCM" .
CAN COMM CIRCUIT>> Check BCM CAN communication system.
Refer to BCS-18, "
CAN Communication Inspection
Using CONSULT-II (Self-Diagnosis)" .
Aiming AdjustmentINFOID:0000000003533364
Refer to LT-20, "Aiming Adjustment".
Bulb ReplacementINFOID:0000000003533365
Refer to LT-21, "Bulb Replacement".
Removal and InstallationINFOID:0000000003533366
Refer to LT-22, "Removal and Installation".
Disassembly and AssemblyINFOID:0000000003533367
Refer to LT-23, "Disassembly and Assembly". Parking brake ON : DTRL REQ OFF
Parking brake OFF : DTRL REQ ON
WKIA1449E
SKIA1039E

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.

FRONT FOG LAMP
LT-49
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FRONT FOG LAMP
Component Parts and Harness Connector LocationINFOID:0000000003533388
System DescriptionINFOID:0000000003533389
Control of the fog lamps is dependent upon the position of the combination switch (lighting switch). The light-
ing switch must be in the 2ND position or AUTO position (LOW beam is ON) for front fog lamp operation.
When the lighting switch is placed in the fog lamp position, the BCM (body control module) receives input sig-
nal requesting the fog lamps to illuminate. When the headlamps are illuminated, this input signal is communi-
cated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication
lines. The CPU (central processing unit) of the IPDM E/R controls the front fog lamp relay coil. When acti-
vated, this relay directs power to the front fog lamps.
OUTLINE
Power is supplied at all times
• to ignition relay, located in the IPDM E/R,
• to front fog lamp relay, located in the IPDM E/R,
• through 20A fuse (No. 53, located in the IPDM E/R)
• to CPU of the IPDM E/R, and
• through 50A fusible link (letter f , located in the fuse and fusible link box)
• to BCM terminal 70.
When the ignition switch is in 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.
Ground is supplied
• to BCM terminal 67
• through grounds M57, M61 and M79, and
• to IPDM E/R terminals 38 and 59
• through grounds E9, E15 and E24.
FOG LAMP OPERATION
The fog lamp switch is built into the combination switch. The lighting switch must be in the 2ND position or
AUTO position (LOW beam is ON) and the fog lamp switch must be ON for fog lamp operation.
WKIA3466E