key INFINITI QX56 2007 Factory Service Manual

TROUBLE DIAGNOSES WORK FLOW
LAN-23
< SERVICE INFORMATION >[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
c. Reception item of “MULTI AV”: “UNKWN” is not indicated. This indicates normal communication between
AV and its receiving units. Do not draw any line.
d. Reception item of “BCM”: On “TCM”, “UNKWN” is indicated. This means BCM cannot receive the signal
from TCM. Draw a line to indicate an error between BCM and TCM (line 2-d in the figure).
e. Reception item of “EPS” and “INTELLIGENT KEY”: “UNKWN” is not indicated. This indicates normal com-
munication between EPS and I-KEY and their receiving units. Do not draw any line.
NOTE:
SKIB8725E

TROUBLE DIAGNOSIS
LAN-41
< SERVICE INFORMATION >[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P Driver Seat Control Unit
0: Error at present, 1 – 39: Error in the past (Number means the number of times the ignition switch is turned OFF→ON)
*: 39 or higher number is fixed at 39 until the self-diagnosis result is erased.
BCM
NOTE:
Replace the unit when “NG” is indicated on the “INITIAL DIAG”.
Front Air Control
SELECT SYS-
TEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT
ICCINITIAL DIAG Status of CAN controller
OKNG
TRANSMIT DIAG Signal transmission status
UNKWN ECM Signal receiving status from the ECM
VDC/TCS/ABSSignal receiving status from the ABS actuator and electric unit
(control unit)
TCM Signal receiving status from the TCM
METER/M&A
Not used even though indicated LANE KEEP
ECM(l)
ICC SENSOR Signal receiving status from the ICC sensor OK UNKWN
STRG
Not used even though indicated METER/M&A(l)
ERROR(l)
LANE DETEC-
TOR
TCM(l)
BCM/SEC Signal receiving status from the BCM OK UNKWN
SELECT SYS-
TEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT PAST PRSNT PAST
AUTO DRIVE
POS.TRANSMIT DIAG Not used even though indicated
METER/M&ASignal receiving status from the combina-
tion meter
OKOK
or
1 – 39
*UNKWN 0
BCM/SEC Signal receiving status from the BCM
TCM Signal receiving status from the TCM
SELECT SYS-
TEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT
BCMINITIAL DIAG Status of CAN controller
OKNG
TRANSMIT DIAG Signal transmission status
UNKWN ECM Signal receiving status from the ECM
IPDM E/R Signal receiving status from the IPDM E/R
METER/M&A Signal receiving status from the combination meter
I-KEY Not used even though indicated

LAN-42
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
0: Error at present, 1 – 39: Error in the past (Number means the number of times the ignition switch is turned OFF→ON)
*: 39 or higher number is fixed at 39 until the self-diagnosis result is erased.
Transfer Control Unit
0: Error at present, 1 – 39: Error in the past (Number means the number of times the ignition switch is turned OFF→ON)
*: 39 or higher number is fixed at 39 until the self-diagnosis result is erased.
ABS Actuator and Electric Unit (Control Unit)
CAUTION:SELECT SYS-
TEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT PAST PRSNT PAST
HVACTRANSMIT DIAG Signal transmission status
OKOK
or
1 – 39
*UNKWN 0
ECM Signal receiving status from the ECM
TCM Not used even though indicated
BCM/SEC Signal receiving status from the BCM
OKOK
or
1 – 39
*UNKWN 0
VDC/TCS/ABSSignal receiving status from the ABS actu-
ator and electric unit (control unit)
IPDM E/R Not used even though indicated
DISPLAYSignal receiving status from the display
control unitOKOK
or
1 – 39
*UNKWN 0
I-KEY
Not used even though indicated EPS
AWD/4WD
e4WD
ICC
LANE KEEP
TIRE-P
SELECT SYS-
TEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT PAST PRSNT PAST
ALL MODE AWD/
4WDTRANSMIT DIAG Signal transmission status
OKOK
or
1 – 39
*UNKWN 0 ECM Signal receiving status from the ECM
VDC/TCS/ABSSignal receiving status from the ABS actu-
ator and electric unit (control unit)
TCM Signal receiving status from the TCM
STRGSignal receiving status from the steering
angle sensor
SELECT SYSTEMCAN DIAG SUP-
PORT MNTRDescriptionNormal Error
PRSNT
ABSINITIAL DIAG Status of CAN controller
OKNG
Caution
TRANSMIT DIAG Signal transmission status
UNKWN ECM Signal receiving status from the ECM
TCM Signal receiving status from the TCM
METER/M&A Not used even though indicated
STRG Signal receiving status from the steering angle sensor
OK UNKWN ICC Signal receiving status from the ICC unit
AWD/4WD Signal receiving status from the transfer control unit

TROUBLE DIAGNOSIS
LAN-45
< SERVICE INFORMATION >[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
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]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
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

LT-2
Wiring Diagram - F/FOG - ......................................51
Terminal and Reference Value for BCM .................52
Terminal and Reference Value for IPDM E/R .........52
How to Proceed with Trouble Diagnosis .................53
Preliminary Check ..................................................53
CONSULT-II Function for BCM ..............................53
CONSULT-II Function for IPDM E/R ......................53
Front Fog Lamps Do Not Illuminate (Both Sides) ...53
Front Fog Lamp Does Not Illuminate (One Side) ...54
Aiming Adjustment ..................................................55
Bulb Replacement ..................................................55
Removal and Installation ........................................56
TURN SIGNAL AND HAZARD WARNING
LAMPS ...............................................................
57
Component Parts and Harness Connector Loca-
tion ..........................................................................
57
System Description .................................................57
CAN Communication System Description ..............59
Schematic ...............................................................60
Wiring Diagram - TURN - ........................................61
Terminal and Reference Value for BCM .................63
How to Proceed with Trouble Diagnosis .................63
Preliminary Check ..................................................64
CONSULT-II Function (BCM) .................................64
Front Turn Signal Lamp Does Not Operate ............64
Door Mirror Turn Signal Lamp Does Not Operate ...65
Rear Turn Signal Lamp Does Not Operate ............66
Hazard Warning Lamp Does Not Operate But
Turn Signal Lamp Operatess ..................................
67
Turn Signal Indicator Lamp Does Not Operate ......68
Bulb Replacement ..................................................69
Removal and Installation ........................................69
LIGHTING AND TURN SIGNAL SWITCH .........70
Removal and Installation ........................................70
HAZARD SWITCH .............................................71
Removal and Installation ........................................71
COMBINATION SWITCH ..................................72
Wiring Diagram - COMBSW - .................................72
Combination Switch Reading Function ...................72
CONSULT-II Function (BCM) .................................73
Combination Switch Inspection ..............................73
Removal and Installation ........................................76
Switch Circuit Inspection ........................................76
STOP LAMP ......................................................77
System Description .................................................77
Wiring Diagram - STOP/L - .....................................78
Bulb Replacement ..................................................78
Removal and Installation ........................................79
BACK-UP LAMP ................................................80
Wiring Diagram - BACK/L - .....................................80
Bulb Replacement ..................................................80
Removal and Installation ........................................81
PARKING, LICENSE PLATE AND TAIL
LAMPS ...............................................................
82
Component Parts and Harness Connector Loca-
tion ..........................................................................
82
System Description .................................................82
CAN Communication System Description ..............83
Schematic ...............................................................84
Wiring Diagram - TAIL/L - .......................................85
Terminal and Reference Value for BCM .................87
Terminal and Reference Value for IPDM E/R .........87
How to Proceed with Trouble Diagnosis .................88
Preliminary Check ...................................................88
CONSULT-II Function for BCM ...............................88
CONSULT-II Function for IPDM E/R .......................88
Parking, License Plate and/or Tail Lamps Do Not
Illuminate .................................................................
88
Parking, License Plate and Tail Lamps Do Not
Turn OFF (After Approx. 10 Minutes) .....................
91
Bulb Replacement ...................................................91
Removal and Installation .........................................92
REAR COMBINATION LAMP ...........................93
Bulb Replacement ...................................................93
Removal and Installation .........................................93
TRAILER TOW ..................................................94
Component Parts and Harness Connector Loca-
tion ..........................................................................
94
System Description .................................................94
Schematic ...............................................................96
Wiring Diagram - T/TOW - ......................................97
INTERIOR ROOM LAMP ..................................101
Component Parts and Harness Connector Loca-
tion ........................................................................
101
System Description ...............................................101
Schematic .............................................................105
Wiring Diagram - INT/L - .......................................107
Terminal and Reference Value for BCM ...............113
How to Proceed with Trouble Diagnosis ...............113
Preliminary Check .................................................114
CONSULT-II Function (BCM) ...............................114
Room/Map Lamp Control Does Not Operate ........115
Personal Lamp Control Does Not Operate (Room/
Map Lamps Operate) ............................................
116
All Step/Foot/Puddle Lamps Do Not Operate .......117
All Interior Room Lamps Do Not Operate .............118
Ignition Keyhole Illumination Control Does Not
Operate .................................................................
118
ILLUMINATION ................................................120
Component Parts and Harness Connector Loca-
tion ........................................................................
120
System Description ...............................................120
CAN Communication System Description ............122
Schematic .............................................................123
Wiring Diagram - ILL - ...........................................126
Removal and Installation of Illumination Control
Switch ...................................................................
136

LT-58
< SERVICE INFORMATION >
TURN SIGNAL AND HAZARD WARNING LAMPS
• to rear combination lamp LH terminal 4
• through rear combination signal lamp LH terminal 6
• to grounds B7 and B19.
BCM sends signal to combination meter through CAN communication lines, and turns on turn signal indicator
lamp within combination meter.
RH Turn
When the turn signal switch is moved to the right position, the BCM, interpreting it as turn signal is ON, outputs
turn signal from BCM terminal 61.
The BCM supplies power
• through BCM terminal 61
• to front turn/fog lamp RH terminal 2
• through front turn/fog lamp RH terminal 3
• to grounds E9, E15 and E24,
• to door mirror RH terminal 15
• through door mirror RH terminal 11
• to grounds M57, M61 and M79 and
• to rear combination lamp RH terminal 4
• through rear combination lamp terminal 6
• to grounds B117 and B132.
BCM sends signal to combination meter through CAN communication lines, and turns on turn signal indicator
lamp within combination meter.
HAZARD LAMP OPERATION
Power is supplied at all times
• through 50A fusible link (letter f , located in the fuse and fusible link box)
• to BCM terminal 70, and
• through 10A fuse [No. 19, located in the fuse block (J/B)]
• to combination meter terminal 8.
Ground is supplied
• to BCM terminal 67 and
• to combination meter terminal 17
• through grounds M57, M61 and M79.
When the hazard switch is depressed, ground is supplied
• to BCM terminal 29
• through hazard switch terminal 2
• through hazard switch terminal 1
• through grounds M57, M61 and M79.
When the hazard switch is depressed, the BCM, interpreting it as hazard warning lamps are ON, outputs turn
signal from BCM terminals 60 and 61.
The BCM supplies power
• through BCM terminals 60 and 61
• to front turn/fog lamp LH and RH terminal 2
• through front turn/fog lamp LH and RH terminal 3
• to grounds E9, E15 and E24,
• to door mirror LH and RH terminal 15
• through door mirror LH and RH terminal 11
• to grounds M57, M61 and M79,
• to rear turn signal lamp LH terminal 1
• through rear turn signal lamp LH terminal 3
• to grounds B7 and B19, and
• to rear turn signal lamp RH terminal 4
• through rear turn signal lamp RH terminal 6
• to grounds B117 and B132.
BCM sends signal to combination meter through CAN communication lines, and turns on turn signal indicator
lamps within combination meter.
REMOTE KEYLESS ENTRY SYSTEM OPERATION
Power is supplied at all times
• through 50A fusible link (letter f , located in the fuse and fusible link box)
• to BCM terminal 70, and
• through 10A fuse [No. 19, located in the fuse block (J/B)]

TURN SIGNAL AND HAZARD WARNING LAMPS
LT-59
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
L
MA
B
LT
N
O
P
• to combination meter terminal 8.
Ground is supplied
• to BCM terminal 67 and
• to combination meter terminal 17
• through grounds M57, M61 and M79.
When the remote keyless entry system is triggered by input from the keyfob, the BCM, interpreting it as turn
signal is ON, outputs turn signal from BCM terminals 60 and 61.
The BCM supplies power
• through BCM terminals 60 and 61
• to front turn/fog lamp LH and RH terminal 2
• through front turn/fog lamp LH and RH terminal 3
• to grounds E9, E15 and E24,
• to door mirror LH and RH terminal 15
• through door mirror LH and RH terminal 11
• to grounds M57, M61 and M79,
• to rear turn signal lamp LH terminal 1
• through rear turn signal lamp LH terminal 3
• to grounds B7 and B19, and
• to rear turn signal lamp RH terminal 4
• through rear turn signal lamp RH terminal 6
• to grounds B117 and B132.
BCM sends signal to combination meter through CAN communication lines, and turns on turn signal indicator
lamps within combination meter.
With power and input supplied, the BCM controls the flashing of the hazard warning lamps when keyfob is
used to activate the remote keyless entry system.
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "System Description".
CAN Communication System DescriptionINFOID:0000000003533405
Refer to LAN-4, "CAN Communication System".

INTERIOR ROOM LAMP
LT-101
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
L
MA
B
LT
N
O
P
INTERIOR ROOM LAMP
Component Parts and Harness Connector LocationINFOID:0000000003533455
System DescriptionINFOID:0000000003533456
When room lamp and personal lamp switch is in DOOR position, room lamp and personal lamp ON/OFF is
controlled by timer according to signals from switches including key switch and key lock solenoid, front door
WKIA3555E

LT-102
< SERVICE INFORMATION >
INTERIOR ROOM LAMP
switch LH, unlock signal from keyfob, door lock and unlock switch, front door lock assembly LH (key cylinder
switch), ignition switch, and glass hatch ajar switch.
When room lamp and personal lamp turns ON, there is a gradual brightening over 1 second. When room lamp
and personal lamp turns OFF, there is a gradual dimming over 1 second.
The room lamp and personal lamp timer is controlled by the BCM (body control module).
Room lamp and personal lamp timer control settings can be changed with CONSULT-II.
Ignition keyhole illumination turns ON when front door LH is opened (door switch ON) or key is removed from
key cylinder. Illumination turns OFF when front door LH is closed (door switch OFF).
Step and foot lamps turn ON when front or rear doors are opened (door switch ON). Lamps turn OFF when
front and rear doors are closed (all door switches OFF).
POWER SUPPLY AND GROUND
Power is supplied at all times
• through 10A fuse [No. 19, located in the fuse block (J/B)]
• to key switch and key lock solenoid terminal 3,
• through 15A fuse [No. 22, located in the fuse block (J/B)]
• to BCM terminal 57, and
• through 50A fusible link (letter f , located in the fuse and fusible link box)
• to BCM terminal 70.
When the key is inserted in key switch and key lock solenoid, power is supplied
• through the key switch and key lock solenoid terminal 4
• to BCM terminal 37.
With the ignition switch in the ON or START position, power is supplied
• 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.
When the front door LH is opened, ground is supplied
• to BCM terminal 47
• through case ground of front door switch LH.
When the front door RH is opened, ground is supplied
• to BCM terminal 12
• through case ground of front door switch RH.
When the rear door LH is opened, ground is supplied
• to BCM terminal 48
• through case ground of rear door switch LH.
When the rear door RH is opened, ground is supplied
• to BCM terminal 13
• through case ground of rear door switch RH.
When the liftgate is opened, ground is supplied
• to BCM terminal 43
• through back door latch (door ajar switch) terminal 7
• through back door latch (door ajar switch) terminal 8
• through grounds B7 and B19.
When the glass hatch is opened, ground is supplied
• to BCM terminal 42
• through case ground of glass hatch ajar switch.
When the front door LH or front door RH door is unlocked by the door lock and unlock switch, BCM receives
serial data
• to BCM terminal 22
• through main power window and door lock/unlock switch terminal 14 or power window and door lock/unlock
switch RH terminal 16
• through main power window and door lock/unlock switch terminal 17 or power window and door lock/unlock
switch RH terminal 11
• through grounds M57, M61 and M79.
When the front door LH is unlocked by the key, the BCM receives serial data
• to BCM terminal 22
• through main power window and door lock/unlock switch terminal 14
• through main power window and door lock/unlock switch terminal 6
• through front door lock assembly LH (key cylinder switch) terminal 6
• through front door lock assembly LH (key cylinder switch) terminal 5