2006 INFINITI QX56 battery

LT-126
TRAILER TOW
Revision: November 20092006 QX56
TRAILER TOWPFP:93020
Component Parts and Harness Connector LocationEKS00BB1
System DescriptionEKS00BB2
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

through 10A fuse (No. 32, located in the IPDM E/R)
1. Fuse and fusible link box2. IPDM E/R fuse layout 3. Fuse and relay box
4. IPDM E/R E118, E119, E120, E121, E122, E123, E124 5. A. Steering column
B. Data link connector M22
C. BCM M18, M19, M20
(View with instrument lower panel
LH removed) 6. A. Trailer turn relay LH E156
B. Battery
C. Trailer tow relay 2 E140
D. Trailer turn relay RH E157
7. A. Trailer tow relay 1 M51 B. Electric brake (pre-wiring) M76
(View with instrument lower panel
LH removed) 8. Trailer connector C2
9. Combination switch (lighting switch)
M28
WKIA4616E

INTERIOR ROOM LAMPLT-137
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Revision: November 2009 2006 QX56

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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Revision: November 2009 2006 QX56
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

LT-152
INTERIOR ROOM LAMP
Revision: November 20092006 QX56
2. ACTIVE TEST
1. Select "BCM" on CONSULT-II. Select "INT LAMP" active test.
2. When switch is in DOOR position, use active test to make sure interior room lamp operates.
OK or NG
OK >> Replace BCM. Refer to BCS-20, "BCM" .
NG >> GO TO 3.
3. CHECK INTERIOR ROOM LAMP INPUT
1. Turn ignition switch OFF.
2. Check voltage between front room/map lamp assembly harness connector R102 terminal 1 and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 5.
4. CHECK INTERIOR ROOM LAMP CIRCUIT
1. Disconnect BCM connector.
2. Check continuity between BCM harness connector M20 terminal 63 and front room/map lamp assembly harness connector R102
terminal 1.
OK or NG
OK >> Replace BCM if interior lamp does not work after setting the connector again. Refer to BCS-20, "
BCM" .
NG >> Repair harness or connector.
5. CHECK INTERIOR ROOM LAMP CIRCUIT
1. Disconnect BCM connector and interior room lamp connector.
2. Check continuity between BCM harness connector M20 terminal 56 and front room/map lamp assembly harness connector R102
terminal 6.
OK or NG
OK >> Replace BCM if interior lamp does not work after setting the connector again. Refer to BCS-20, "
BCM" .
NG >> Repair harness or connector between BCM and room/
map lamp.
Room lamps should turn ON.
LKIA0092E
1 - Ground
: Battery voltage should exist.
WKIA1479E
63 - 1: Continuity should exist.
WKIA1480E
56 - 6: Continuity should exist.
WKIA1481E

INTERIOR ROOM LAMPLT-153
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Revision: November 2009 2006 QX56
Personal Lamp Control Does Not Operate (Room/Map Lamps Operate)EKS00BBE
1. CHECK EACH DOOR SWITCH
Select "BCM" on CONSULT-II. With "INT LAMP" data monitor, make
sure switches listed in display item list turn ON-OFF linked with
switch operation. Refer to LT- 1 3 6 , "
SWITCH OPERATION" for
switches and their function.
OK or NG
OK >> GO TO 2.
NG >> Inspect malfunctioning door switch.
2. CHECK PERSONAL LAMP OUTPUT
1. Turn ignition switch OFF.
2. Confirm lamp switch is in the DOOR position.
3. Disconnect personal lamp connector.
4. Open any door.
5. Check voltage between personal lamp harness connector termi- nal 3 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK PERSONAL LAMP CONTROL CIRCUIT
1. Disconnect front room/map lamp assembly connector.
2. Check continuity between front room/map lamp assembly har- ness connector R102 terminal 2 and personal lamp harness
connector terminal 1.
OK or NG
OK >> Replace personal lamp.
NG >> Repair harness or connector.
SKIA5930E
3 - Ground : Battery voltage should exist.
WKIA1482E
2 - 1 : Continuity should exist.
WKIA1908E

LT-154
INTERIOR ROOM LAMP
Revision: November 20092006 QX56
All Step/Foot/Puddle Lamps Do Not OperateEKS00BBF
1. CHECK EACH DOOR SWITCH
Select "BCM" on CONSULT-II. With "INT LAMP" data monitor, make
sure switches listed in display item list turn ON-OFF linked with
switch operation. Refer to LT- 1 5 1 , "
Display Item List" for switches
and their functions.
OK or NG
OK >> GO TO 2.
NG >> Inspect malfunctioning switch system.
2. CHECK STEP LAMP POWER SUPPLY
1. Turn ignition switch OFF.
2. Check voltage between front step lamp LH harness connector D11 terminal + and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.
3. CHECK STEP LAMP CONTROL CIRCUIT
1. Disconnect BCM connector and front step lamp LH connector.
2. Check continuity between BCM harness connector M20 terminal 62 and front step lamp LH harness connector D11 terminal –.
OK or NG
OK >> Replace BCM if front step lamp does not work after set- ting the connector again. Refer to BCS-20, "
BCM" .
NG >> Repair harness or connector.
4. CHECK STEP LAMP CIRCUIT
1. Disconnect BCM connector and front step lamp LH connector.
2. Check continuity between BCM harness connector M20 terminal 56 and front step lamp LH harness connector D11 terminal +.
OK or NG
OK >> Replace BCM if front step lamp does not work after set- ting the connector again. Refer to BCS-20, "
BCM" .
NG >> Repair harness or connector.
SKIA5930E
+ - Ground : Battery voltage should exist.
LKIA0306E
– - 62 : Continuity should exist.
WKIA1484E
+ - 56: Continuity should exist.
WKIA1485E

INTERIOR ROOM LAMPLT-155
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Revision: November 2009 2006 QX56
All Interior Room Lamps Do Not OperateEKS00BBG
1. CHECK POWER SUPPLY CIRCUIT
1. All interior room lamp switches are OFF.
2. Turn ignition switch ON.
3. Check voltage between BCM harness connector M20 terminal 56 and ground.
OK or NG
OK >> Repair harness or connector. To prevent making a short circuit, be sure to disconnect battery negative cable
after repairing harness, and then reconnect.
NG >> Replace BCM. Refer to BCS-20, "
BCM" .
Ignition Keyhole Illumination Control Does Not OperateEKS00BBH
1. CHECK EACH SWITCH
Select "BCM" on CONSULT-II. With "INT LAMP" data monitor, make
sure switches listed in display item list turn ON-OFF linked with
switch operation. Refer to LT- 1 5 1 , "
Display Item List" for switches
and their functions.
OK or NG
OK >> GO TO 2.
NG >> Inspect malfunctioning switch system.
2. ACTIVE TEST
1. Select "BCM" on CONSULT-II. Select "INT LAMP".
2. Select "IGN ILLUM" active test to make sure lamp operates.
OK or NG
OK >> Replace BCM. Refer to BCS-20, "BCM" .
NG >> GO TO 3.
3. CHECK IGNITION KEYHOLE ILLUMINATION INPUT
1. Check voltage between ignition keyhole illumination harness connector M150 terminal + and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 6. 56 - Ground
: Battery voltage should exist.
WKIA1486E
SKIA5930E
Ignition keyhole illumination should turn ON.
SKIA3992E
+ - Ground: Battery voltage should exist.
WKIA1909E