2006 INFINITI QX56 ignition

LT-128
TRAILER TOW
Revision: November 20092006 QX56

to trailer connector terminal 4.
TRAILER BRAKE OPERATION
The trailer brake is controlled by the electric brake. The electric brake receives stop lamp switch signal at elec-
tric brake (pre-wiring) terminal 2 when the brake pedal is depressed.
When the brake pedal is depressed, power is supplied by the electric brake

through electric brake (pre-wiring) terminal 3

to trailer connector terminal 3.
TRAILER POWER SUPPLY OPERATION
The trailer power supply is controlled by the trailer tow relay 2.
When the ignition switch is in the ON or START position, power is supplied

through 10A fuse (No. 51, located in the IPDM E/R)

through IPDM E/R terminal 16

to trailer tow relay 2 terminal 1.
When energized, the trailer tow relay 2 supplies power

through trailer tow relay 2 terminals 5 and 7

to trailer connector terminal 5.

INTERIOR ROOM LAMPLT-135
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System DescriptionEKS00BB6
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
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, and

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.

LT-136
INTERIOR ROOM LAMP
Revision: November 20092006 QX56
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

through grounds M57, M61 and M79.
When a signal, or combination of signals is received by BCM, ground is supplied

through BCM terminal 63

to door mirror LH and RH terminal 13

to front room/map lamp assembly terminal 1

through front room/map lamp assembly terminal 2

to personal lamps terminal 1, and

through BCM terminal 49

to cargo lamp terminal 1.
With power and ground supplied, the lamps illuminate.
SWITCH OPERATION
When any door switch is ON (door is opened), ground is supplied

to front and rear step lamps LH and RH and foot lamp LH and RH terminal –

through BCM terminal 62.
And power is supplied

through BCM terminal 56

to front and rear step lamps LH and RH terminal +

to ignition keyhole illumination terminal +

to door mirror LH and RH terminal 12

to front room/map lamp assembly terminal 6

to vanity lamp LH and RH terminal 1

to personal lamp 2nd row and 3rd row terminal 3

to cargo lamp terminal 2, and

to foot lamp LH and RH terminal +.
When map lamp switch is ON, ground is supplied

to front room/map lamp assembly terminal 5

through grounds M57, M61 and M79.
When vanity lamp (LH and RH) is ON, ground is supplied

to vanity lamp (LH and RH) terminal 2

through grounds M57, M61 and M79.
When cargo lamp is ON, ground is supplied through cargo lamp case ground.
ROOM LAMP TIMER OPERATION
When lamp switch is in DOOR position and all conditions below are met, BCM performs timer control (maxi-
mum 30 seconds) for interior room lamp and map lamp ON/OFF.
Power is supplied

INTERIOR ROOM LAMPLT-137
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through 10A fuse [No. 19, located in the fuse block (J/B)]

to key switch and key lock solenoid terminal 3.
Key is removed from ignition key cylinder (key switch OFF), power will not be supplied to BCM terminal 37.
Serial data is supplied

to BCM terminal 22

through main power window and door lock/unlock switch terminal 14.
At the time that front door LH is opened, BCM detects that front door LH is unlocked. It determines that interior
room lamp and map lamp timer operation conditions are met, and turns the interior room lamps ON for 30 sec-
onds.
Key is in ignition key cylinder (key switch ON), power is supplied

through key switch and key lock solenoid terminal 4

to BCM terminal 37.
When key is removed from key switch and key lock solenoid (key switch OFF), power supply to BCM terminal
37 is terminated. BCM detects that key has been removed, determines that interior room lamp and map lamp
timer conditions are met, and turns the interior room lamps ON for 30 seconds.
When front door LH opens → closes, and the key is not inserted in the key switch and key lock solenoid (key
switch OFF), BCM terminal 47 changes between 0V (door open) → 12V (door closed). The BCM determines
that conditions for interior room lamp operation are met and turns the interior room lamp ON for 30 seconds.
Timer control is canceled under the following conditions.

Front door LH is locked [when locked by keyfob, main power window and door lock/unlock switch, or front
door lock assembly LH (key cylinder switch)]

Front door LH is opened (front door switch LH turns ON)

Ignition switch ON.
INTERIOR LAMP BATTERY SAVER CONTROL
If interior lamp is left “ON”, it will not be turned off even when door is closed.
BCM turns off interior lamp automatically to save battery 30 minutes after ignition switch is turned off.
BCM controls interior lamps listed below:

Va n i t y l a m p

Room/map lamp

Cargo lamp

Personal lamp

St ep la m ps

Puddle lamps

Foot lamps

Ignition keyhole illumination
After lamps turn OFF by the battery saver system, the lamps illuminate again when

signal received from keyfob, or main power window and door lock/unlock switch or front door lock assem-
bly LH (key cylinder switch) is locked or unlocked

door is opened or closed

key is removed from ignition key cylinder (key switch OFF) or inserted in ignition key cylinder (key switch
ON).
Interior lamp battery saver control period can be changed by the function setting of CONSULT-II.

INTERIOR ROOM LAMPLT-147
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Terminals and Reference Values for BCMEKS00BB9
Terminal
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
1BR/W Ignition keyhole illumi-
nation signal
OFFDoor is locked. (SW OFF)
Battery voltage
Door is unlocked. (SW ON) 0V
12 R/L Front door switch RH
signal
OFFFront door
switch RH ON (open)
0V
OFF (closed) Battery voltage
13 GR Rear door switch RH
signal
OFFRear door
switch RH ON (open)
0V
OFF (closed) Battery voltage
22 W/V Bus ——
37 B/R Key-in switch detection
signal OFFVehicle key is removed.
0V
Vehicle key is inserted. Battery voltage
38 W/L Ignition power supply ON —Battery voltage
39 L CAN-H —— —
40 P CAN-L —— —
42 GR Glass hatch ajar switch
signal OFFGlass hatch
ajar switch ON (open)
0V
OFF (closed) Battery voltage
43 R/B Back door latch (door
ajar switch) signal
OFFBack door
latch (door
ajar switch) ON (open)
0V
OFF (closed) Battery voltage
47 SB Front door switch LH
signal
OFFFront door
switch LH ON (open)
0V
OFF (closed) Battery voltage
48 R/Y Rear door switch LH
signal
OFFRear door
switch LH ON (open)
0V
OFF (closed) Battery voltage
49 R Luggage lamp output OFF Any door is open (ON)
0V
All doors are closed (OFF) Battery voltage
56 R/G Battery saver output
signal OFF
30 minutes after ignition switch is
turned to OFF 0V
ON — Battery voltage
57 Y/R Battery power supply OFF —Battery voltage
62 R/W Step lamp signal OFFAny door is open (ON)
0V
All doors are closed (OFF) Battery voltage
63 L Interior room/map lamp
signal OFFEach interior
lamp switch
in DOOR
position Any
door
switch ON
(open) 0V
OFF
(closed) Battery voltage
67 B Ground ON— 0V
70 W/B Battery power supply OFF —Battery voltage
PIIA2344J

LT-148
INTERIOR ROOM LAMP
Revision: November 20092006 QX56
How to Proceed With Trouble DiagnosisEKS00BBA
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT- 1 3 5 , "
System Description" .
3. Carry out the Preliminary Check. Refer to LT- 1 4 8 , "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does the interior room lamp operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckEKS00BBB
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown BCM fuses or fusible link.
Refer to LT- 1 4 0 , "
Wiring Diagram — INT/L —" .
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 connector and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open between BCM and fuse or fusible link.
3. CHECK GROUND CIRCUIT
Check continuity between BCM and ground.
OK or NG
OK >> Inspection End.
NG >> Check harness ground circuit.
Unit Power sourceFuse and fusible link No.
BCM Battery f
22
Ignition switch ON or START position 59
TerminalsIgnition switch position
(+) (– )O FF O N
Connector Terminal
M20 57
Ground Battery voltage Battery voltage
70 Battery voltage Battery voltage
M18 38 0V Battery voltage
WKIA1478E
Terminals
Continuity
Connector Terminal
M20 67Ground Yes
LIIA0915E

INTERIOR ROOM LAMPLT-149
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CONSULT-II Function (BCM)EKS00BBC
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and CON-
SULT-II CONVERTER to the data link connector, then turn igni-
tion switch ON.
2. Touch "START (NISSAN BASED VHCL)".
3. Touch "BCM" on "SELECT SYSTEM" screen. If "BCM" is not indicated, go to GI-40, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
BCM diagnostic
test item Diagnostic mode
Description
Inspection by part WORK SUPPORT
Supports inspections and adjustments. Commands are transmitted to the BCM
for setting the status suitable for required operation, input/output signals are
received from the BCM and received data is displayed.
DATA MONITOR Displays BCM input/output data in real time. ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read. ECU PART NUMBER BCM part number can be read.CONFIGURATION Performs BCM configuration read/write functions.
BBIA0369E
BCIA0029E
BCIA0030E

LT-150
INTERIOR ROOM LAMP
Revision: November 20092006 QX56
4. Touch "INT LAMP" on "SELECT TEST ITEM" screen.
WORK SUPPORT
Operation Procedure
1. Touch "INT LAMP" on "SELECT TEST ITEM" screen.
2. Touch "WORK SUPPORT" on "SELECT DIAG MODE" screen.
3. Touch "SET I/L D-UNLCK INTCON" 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
Reference between "MODE" and "TIME" for "TURN ON/OFF".
DATA MONITOR
Operation Procedure
1. Touch "INT 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 "SELECT MONITOR ITEM" screen.
4. Touch "START".
5. When "SELECTION FROM MENU" is selected, touch items to be monitored. When "ALL SIGNALS" 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".
PKIA5226E
Item Description CONSULT-II
SET I/L D-UNLCK INTCON The 30 seconds operating function of the interior room lamps and the
ignition keyhole illumination can be selected when front door LH is
released (unlocked). ON/OFF
ROOM LAMP ON TIME SET The time in order to escalate illumination can be adjusted when the
interior room lamps and the ignition keyhole illumination is turned on. MODE 1 - 7
ROOM LAMP OFF TIME SET The time in order to diminish illumination can be adjusted when the
interior room lamps and the ignition keyhole illumination is turned off. MODE 1 - 7
MODE 1 2 3 4 5 6 7
Time (sec.) 0.5 1 2 3 4 5 0
All signals Monitors all the signals.
Selection from menu Selects and monitors the individual signal.