ignition INFINITI QX56 2006 Factory Service Manual

LAN-134
[CAN]
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect front air control connector.
2. Check resistance between front air control harness connector terminals.
OK or NG
OK >> Replace front air control.
NG >> Repair harness between front air control and data link connector.
Transfer Control Unit Circuit InspectionUKS004TS
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check terminals and connector of transfer control unit for damage, bend and loose connection (control unit side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect transfer control unit connector.
2. Check resistance between transfer control unit harness connec- tor terminals.
OK or NG
OK >> Replace transfer control unit.
NG >> Repair harness between transfer control unit and har- ness connector E152.
ABS Actuator and Electric Unit (Control Unit) Circuit InspectionUKS004TT
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check terminals and connector of ABS actuator and electric unit (control unit) for damage, bend and loose connection (control unit side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
Front air control connector TerminalResistance
(Approx.)
M50 34 35 54 – 66 Ω
PKIA8136E
Transfer control
unit connector TerminalResistance
(Approx.)
E142 7854 – 66 Ω
PKIA6844E

TROUBLE DIAGNOSIS FOR SYSTEMLAN-135
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2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ABS actuator and electric unit (control unit) connector.
2. Check resistance between ABS actuator and electric unit (con- trol unit) harness connector terminals.
OK or NG
OK >> Replace ABS actuator and electric unit (control unit).
NG >> Repair harness between ABS actuator and electric unit (control unit) and harness connector E152.
IPDM E/R Circuit InspectionUKS004TU
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check terminals and connector of IPDM E/R for damage, bend and loose connection (control module side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect IPDM E/R connector.
2. Check resistance between IPDM E/R harness connector termi- nals.
OK or NG
OK >> Replace IPDM E/R.
NG >> Repair harness between IPDM E/R and harness con- nector E152.
CAN Communication Circuit InspectionUKS004TV
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect the harness connector for each unit on the CAN network and check terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector as necessary.
ABS actuator and electric unit (con-
trol unit) connector Terminal
Resistance
(Approx.)
E125 111554 – 66 Ω
SKIA6872E
IPDM E/R
connector TerminalResistance
(Approx.)
E122 3940108 – 132 Ω
PKIA8141E

TROUBLE DIAGNOSIS FOR SYSTEMLAN-137
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6. UNIT REPRODUCIBILITY INSPECTION
Perform the following procedure for each unit on the CAN network, and then perform reproducibility test.
1. Turn ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect the unit connector.
4. Connect the battery cable to the negative terminal.
5. Make sure that the symptom filled in the “Symptom” of the check sheet is reproduced. (Do not confuse it
with the symptom related to removed unit.)
6. Make sure that the same symptom is reproduced.
Inspection results
Reproduced>>Install removed unit, and then check the other unit.
Not reproduced>>Replace removed unit.
IPDM E/R Ignition Relay Circuit InspectionUKS004TW
Check the following. If no malfunction is found, replace the IPDM E/R.

IPDM E/R power supply circuit. Refer to PG-28, "IPDM E/R Power/Ground Circuit Inspection" .

Ignition power supply circuit. Refer to PG-13, "IGNITION POWER SUPPLY — IGNITION SW. IN ON
AND/OR START" .

LT-3
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STOP LAMP .....................................................
. 108
Removal and Installation ..................................... . 108
HIGH_MOUNTED STOP LAMP ...................... . 108
STOP LAMP ..................................................... . 108
BACK-UP LAMP ................................................... . 109
Wiring Diagram — BACK/L — ............................ . 109
Bulb Replacement ............................................... .. 110
BACK-UP LAMP .............................................. .. 110
INSTALLATION ................................................ .. 110
Removal and Installation ..................................... .. 110
BACK-UP LAMP .............................................. .. 110
PARKING, LICENSE PLATE AND TAIL LAMPS .. .. 111
Component Parts and Harness Connector Location . . 111
System Description ............................................. . . 111
OPERATION BY LIGHTING SWITCH ............. .. 112
COMBINATION SWITCH READING FUNCTION .. 112
EXTERIOR LAMP BATTERY SAVER CONTROL .. 112
CAN Communication System Description ........... .. 112
Schematic ........................................................... .. 113
Wiring Diagram — TAIL/L — ................................. 114
Terminals and Reference Values for BCM .......... .. 117
Terminals and Reference Values for IPDM E/R .. .. 118
How to Proceed With Trouble Diagnosis ............. .. 118
Preliminary Check ............................................... .. 118
CHECK POWER SUPPLY AND GROUND CIR-
CUIT ................................................................. .. 118
CONSULT-II Functions ........................................ .. 119
Parking, License Plate and/or Tail Lamps Do Not
Illuminate ............................................................. . 120
Parking, License Plate and Tail Lamps Do Not Turn
OFF (After Approx. 10 Minutes) .......................... . 123
Bulb Replacement ............................................... . 124
FRONT PARKING LAMP ................................. . 124
LICENSE PLATE LAMP ................................... . 124
SIDE MARKER LAMP (FRONT) ...................... . 124
TAIL LAMP ....................................................... . 124
Removal and Installation ..................................... . 124
FRONT PARKING LAMP ................................. . 124
LICENSE PLATE LAMP ................................... . 124
INSTALLATION ................................................ . 124
SIDE MARKER LAMP (REAR) ........................ . 124
TAIL LAMP ....................................................... . 124
REAR COMBINATION LAMP ............................... . 125
Bulb Replacement ............................................... . 125
SIDE MARKER LAMP (REAR) ........................ . 125
TAIL LAMP ....................................................... . 125
TURN SIGNAL ................................................. . 125
STOP LAMP ..................................................... . 125
INSTALLATION ................................................ . 125
Removal and Installation ..................................... . 125
REAR COMBINATION LAMP .......................... . 125
TRAILER TOW ...................................................... . 126Component Parts and Harness Connector Location
.126
System Description .............................................. .126
TRAILER TAIL LAMP OPERATION ................. .127
TRAILER BRAKE, TURN SIGNAL AND HAZARD
LAMP OPERATION .......................................... .127
TRAILER BRAKE OPERATION ....................... .128
TRAILER POWER SUPPLY OPERATION ....... .128
Schematic ............................................................ .129
Wiring Diagram — T/TOW — .............................. .130
INTERIOR ROOM LAMP ....................................... .134
Component Parts and Harness Connector Location .134
System Description .............................................. .135
POWER SUPPLY AND GROUND ................... .135
SWITCH OPERATION ..................................... .136
ROOM LAMP TIMER OPERATION ................. .136
INTERIOR LAMP BATTERY SAVER CONTROL .137
Schematic ............................................................ .138
Wiring Diagram — INT/L — ................................. .140
Terminals and Reference Values for BCM ........... .147
How to Proceed With Trouble Diagnosis ............. .148
Preliminary Check ............................................... .148
INSPECTION FOR POWER SUPPLY AND
GROUND CIRCUIT .......................................... .148
CONSULT-II Function (BCM) .............................. .149
CONSULT-II OPERATION ................................ .149
WORK SUPPORT ............................................ .150
DATA MONITOR .............................................. .150
ACTIVE TEST .................................................. .151
Room/Map Lamp Control Does Not Operate ...... .151
Personal Lamp Control Does Not Operate (Room/
Map Lamps Operate) ........................................... .153
All Step/Foot/Puddle Lamps Do Not Operate ...... .154
All Interior Room Lamps Do Not Operate ............ .155
Ignition Keyhole Illumination Control Does Not
Operate ................................................................ .155
ILLUMINATION ...................................................... .157
Component Parts and Harness Connector Location .157
System Description .............................................. .157
ILLUMINATION OPERATION BY LIGHTING
SWITCH ........................................................... .158
EXTERIOR LAMP BATTERY SAVER CONTROL .159
CAN Communication System Description ........... .159
Schematic ............................................................ .160
Wiring Diagram — ILL — ..................................... .163
Removal and Installation of Illumination Control
Switch .................................................................. .174
REMOVAL ........................................................ .174
INSTALLATION ................................................ .174
BULB SPECIFICATIONS ....................................... .175
Headlamp ............................................................ .175
Exterior Lamp ...................................................... .175
Interior Lamp/Illumination .................................... .175

HEADLAMP (FOR USA)LT-5
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HEADLAMP (FOR USA)PFP:26010
Component Parts and Harness Connector LocationEKS00B7S
System DescriptionEKS00B7T
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, and

to headlamp high relay, located in the IPDM E/R, and

to headlamp low relay, located in the IPDM E/R, and

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)
WKIA3463E

LT-6
HEADLAMP (FOR USA)
Revision: November 20092006 QX56

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)

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.
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.

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.

HEADLAMP (FOR USA)LT-7
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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 DescriptionEKS00B7U
Refer to LAN-26, "CAN COMMUNICATION" .

HEADLAMP (FOR USA)LT-13
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Terminals and Reference Values for BCMEKS00B7X
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 ONLighting, turn, wiper OFF
Wiper dial position 4
3 G/Y Combination switch input 4 ONLighting, turn, wiper OFF
Wiper dial position 4
4 Y Combination switch input 3 ONLighting, 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
32 R/G Combination switch output 5 ONLighting, turn, wiper OFF
Wiper dial position 4
33 R/Y Combination switch output 4 ONLighting, turn, wiper OFF
Wiper dial position 4
34 L Combination switch output 3 ONLighting, turn, wiper OFF
Wiper dial position 4
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E

LT-14
HEADLAMP (FOR USA)
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Terminals and Reference Values for IPDM E/REKS00B7Y
How to Proceed With Trouble DiagnosisEKS00B7Z
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT- 5 , "
System Description" .
3. Perform the Preliminary Check. Refer to LT- 1 4 , "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does the headlamp operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckEKS00B80
CHECK POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown fuses or fusible link.
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 ———
67 B Ground ON— 0V
70 W/B Battery power supply (fusible link) OFF —Battery voltage
Terminal
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
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) ONLighting switch
2ND position OFF
0V
ON Battery voltage
54 R/Y Headlamp low (RH) ONLighting switch
2ND position OFF
0V
ON Battery voltage
55 G Headlamp high (LH) ONLighting switch
HIGH or PASS
position OFF
0V
ON Battery voltage
56 L/W Headlamp high (RH) ONLighting switch
HIGH or PASS
position OFF
0V
ON Battery voltage
59 B Ground ON— 0V
Unit Power sourceFuse and fusible link No.
BCM Battery
f
Ignition switch ON or START position 59

HEADLAMP (FOR USA)LT-15
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Refer to LT- 9 , "Wiring Diagram — H/LAMP —" .
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" .
2. CHECK POWER SUPPLY CIRCUIT
1. Disconnect BCM connectors.
2. Check voltage between BCM harness connector and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open between BCM and fuse or fus- ible link.
3. CHECK GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
OK or NG
OK >> Inspection End.
NG >> Check ground circuit harness.
IPDM E/R Battery 34
35
40
41
53
Unit
Power sourceFuse and fusible link No.
BCMIgnition switch position
(+) (– )OFFACCON
Connector Terminal
M18 38 Ground0V 0V
Battery
voltage
M20 70 Battery
voltage Battery
voltage Battery
voltage
WKIA1436E
BCM Continuity
Connector Terminal
M20 67Ground Yes
LIIA0915E