2004 INFINITI QX56 Ins

LT-132
INTERIOR ROOM LAMP
Revision: August 20072004 QX56

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:

Vanity lamp

Room/map lamp

Cargo lamp

Personal lamp

Step lamps

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.

LT-142
INTERIOR ROOM LAMP
Revision: August 20072004 QX56
Terminals and Reference Values for BCMEKS007D1
How to Proceed With Trouble DiagnosisEKS007D2
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT-130, "
System Description" .
3. Carry out the Preliminary Check. Refer to LT- 1 4 3 , "
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.
Te r m i n a l
No.Wire
colorSignal nameMeasuring condition
Reference value
(Approx.) Ignition
switchOperation or condition
12 R/LFront door switch RH
signalOFFFront door switch
RHON (open) 0V
OFF (closed) Battery voltage
13 GRRear door switch RH
signalOFFRear door switch
RHON (open) 0V
OFF (closed) Battery voltage
22 W/VPower window switch
serial link——
37 B/RKey-in switch detec-
tion signalOFFVehicle key is removed. 0V
Vehicle key is inserted. Battery voltage
38 W/L Ignition power supply ON — Battery voltage
39 W CAN-H — — —
40 R CAN-L — — —
42 GRGlass hatch ajar
switch signalOFFGlass hatch ajar
switchON (open) 0V
OFF (closed) Battery voltage
43 R/BBack door latch (door
ajar switch) signalOFFBack door latch
(door ajar switch)ON (open) 0V
OFF (closed) Battery voltage
47 SBFront door switch LH
signalOFFFront door switch
LHON (open) 0V
OFF (closed) Battery voltage
48 R/YRear door switch LH
signalOFFRear door switch
LHON (open) 0V
OFF (closed) Battery voltage
56 R/GBattery saver output
signalOFF30 minutes after ignition switch is turned
to OFF0V
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 LInterior room/map
lamp signalOFFEach interior lamp
switch in DOOR
positionAny door
switchON
(open)0V
OFF
(closed)Battery voltage
67 B Ground ON — 0V
70 W/B Battery power supply OFF — Battery voltage
PIIA2344J

INTERIOR ROOM LAMP
LT-143
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Preliminary CheckEKS007D3
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown BCM fuses or fusible link.
Refer to LT-135, "
Wiring Diagram — INT/L —" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of blown fuse before installing new fuse. 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 source Fuse or fusible link No.
BCMBatteryf
22
Ignition switch ON or START position 59
BCM
(–)Ignition switch position
(+)
OFF ON
ConnectorTerminal
(wire color)
M2057 (Y/R)
GroundBattery voltage Battery voltage
70 (W/B) Battery voltage Battery voltage
M18 38 (W/L) 0V Battery voltage
WKIA1478E
BCM
Continuity
ConnectorTe r m i n a l
(wire color)
M20 67 (B) Ground Yes
LIIA0915E

LT-144
INTERIOR ROOM LAMP
Revision: August 20072004 QX56
CONSULT-II Function (BCM)EKS007D4
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-39, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
BCM diagnostic
test itemDiagnostic mode Description
Inspection by partWORK SUPPORTSupports 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-146
INTERIOR ROOM LAMP
Revision: August 20072004 QX56
Display Item List
ACTIVE TEST
Operation Procedure
1. Touch “INT LAMP” on “SELECT TEST ITEM” screen.
2. Touch “ACTIVE TEST” on “SELECT DIAG MODE” screen.
3. Touch item to be tested and check operation of the selected item.
4. During the operation check, touching “BACK” or "OFF" deactivates the operation.
Display Item List
Room/Map Lamp Control Does Not OperateEKS007D5
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-146, "
Display Item List" for switches
and their functions.
OK or NG
OK >> GO TO 2.
NG >> Inspect malfunctioning switch system.
Monitor item Contents
IGN ON SW “ON/OFF” Displays “IGN position (ON)/OFF, ACC position (OFF)” judged from the ignition switch signal.
KEY ON SW “ON/OFF” Displays “Key inserted (ON)/key removed (OFF)” status judged from the key switch signal.
DOOR SW-DR “ON/OFF”Displays status of the front door LH as judged from the front door switch LH signal. (Door is
open: ON/Door is closed: OFF)
DOOR SW-AS “ON/OFF”Displays “Door open (ON)/Door closed (OFF)” status, determined from front door switch RH
signal.
DOOR SW-RR “ON/OFF”Displays “Door open (ON)/Door closed (OFF)” status, determined from rear door switch RH
signal.
DOOR SW-RL “ON/OFF”Displays “Door open (ON)/Door closed (OFF) ” status, determined from rear door switch LH
signal.
BACK DOOR SW “ON/OFF”Displays “Door open (ON)/Door closed (OFF)” status, determined from back door latch (door
ajar switch) signal.
KEY CYL LK-SW “ON/OFF”Displays “Door locked (ON) status, determined from front door lock assembly LH (key cylinder
switch) in front door LH.
KEY CYL UN-SW “ON/OFF”Displays “Door unlocked (OFF) status, determined from front door lock assembly LH (key cylin-
der switch) in front door LH.
CDL LOCK SW “ON/OFF”Displays “Door locked (ON)/Door unlocked (OFF) status, determined from locking detection
switch in front door LH.
CDL UNLOCK SW “ON/OFF”Displays “Door unlocked (OFF)” status, determined from locking detection switch in front door
RH.
KEYLESS LOCK “ON/OFF” Displays “Locked (ON)/Other (OFF)” status, determined from lock signal.
KEYLESS UNLOCK “ON/OFF” Displays “Unlocked (ON)/Other (OFF)” status, determined from unlock signal.
Test item Description
INT LAMP Interior room lamp can be operated by any ON-OFF operations.
IGN ILLUM Ignition keyhole illumination can be operated by ON-OFF operation.
SKIA5930E

INTERIOR ROOM LAMP
LT-147
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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-19, "Removal and Installa-
tion of 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 (L) 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 (L) and front room/map lamp assembly harness connector
R102 terminal 1 (L).
OK or NG
OK >> Replace BCM if interior lamp does not work after setting
the connector again. Refer to BCS-19, "
Removal and
Installation of 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 (R/G) and front room/map lamp assembly harness connector
R102 terminal 6 (R/G).
OK or NG
OK >> Replace BCM if interior lamp does not work after setting
the connector again. Refer to BCS-19, "
Removal and
Installation of BCM" .
NG >> Repair harness or connector between BCM and room/
map lamp. Room lamps should turn ON.
LKIA0092E
Battery voltage should exist.
WKIA1479E
Continuity should exist.
WKIA1480E
Continuity should exist.
WKIA1481E

LT-148
INTERIOR ROOM LAMP
Revision: August 20072004 QX56
Personal Lamp Control Does Not Operate (Room/Map Lamps Operate)EKS007D6
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 1 , "
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 (R/G) 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 (R) and personal lamp harness
connector terminal 1 (R).
OK or NG
OK >> Replace personal lamp.
NG >> Repair harness or connector.
SKIA5930E
Battery voltage should exist.
WKIA1482E
Continuity should exist.
WKIA1908E

INTERIOR ROOM LAMP
LT-149
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All Step/Foot/Puddle Lamps Do Not OperateEKS007D7
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 4 6 , "
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 + (R/G) 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 (R/W) and front step lamp LH harness connector D11 termi-
nal – (R/W).
OK or NG
OK >> Replace BCM if step lamp does not work after setting
the connector again. Refer to BCS-19, "
Removal and
Installation of BCM" .
NG >> Repair harness or connector.
4. CHECK STEP LAMP CIRCUIT
1. Disconnect BCM connector and step lamp LH connector.
2. Check continuity between BCM harness connector M20 terminal
56 (R/G) and front step lamp LH harness connector D11 termi-
nal + (R/G).
OK or NG
OK >> Replace BCM if step lamp does not work after setting
the connector again. Refer to BCS-19, "
Removal and
Installation of BCM" .
NG >> Repair harness or connector.
SKIA5930E
Battery voltage should exist.
LKIA0306E
Continuity should exist.
WKIA1484E
Continuity should exist.
WKIA1485E