ignition INFINITI QX56 2008 Factory Service Manual

INL-8
< FUNCTION DIAGNOSIS >
INTERIOR ROOM LAMP CONTROL SYSTEM
Component Description
INFOID:0000000001601378
13. Rear step lamp LH D206 Rear step lamp RH D306 14. Cargo lamp B153 15. Personal lamp 3rd row R205
16. Personal lamp 2nd row R203
Part name Description
BCM Provides power and ground and controls timer functions for the
interior room lamps, step lamps and cargo lamp.
Key switch and ignition knob switch Provides key in ignition status to the BCM.
Door switches Provides door OPEN/CLOSED status to the BCM.
Glass hatch switch Provides glass hatch OPEN/CLOSED status to the BCM.
Back door latch Provides back door OPEN/CLOSED status to the BCM.
Power window and door lock/unlock switch RH Provides door lock/unlock position switch RH status to the BCM.
Main power window and door lock/unlock switch [front door lock
assembly LH (key cylinder switch)]. Provides door lock/unlock position switch LH status to the BCM.
Revision: March 2010
2008 QX56

ILLUMINATION CONTROL SYSTEMINL-9
< FUNCTION DIAGNOSIS >
C
DE
F
G H
I
J
K
M A
B
INL
N
O P
ILLUMINATION CONTROL SYSTEM
System DiagramINFOID:0000000001601379
System DescriptionINFOID:0000000001601380
The illumination lamps operation is dependent upon the posit ion of the lighting switch (combination switch).
When the lighting switch is placed in the 1ST or 2ND posit ion (or if the auto light system is activated) the BCM
(body control module) receives input requesting the park ing lamps to illuminate. This input is communicated to
the IPDM E/R (intelligent power distribution module engine room) via the CAN communication lines. The CPU
(central processing unit) of the IPDM E/R controls the tail lamp relay coil. When energized, this relay directs
power to the parking and illumination lamps, which then illuminate.
BATTERY SAVER CONTROL
When the lighting switch (combination switch) is in t he 1ST or 2ND position and the ignition switch is turned
from ON or ACC to OFF, the battery saver control feat ure is activated. Under this condition, the illumination
lamps remain illuminated for 30 minutes unless the light ing switch position is changed. If the lighting switch
position is changed, then the illumination lamps are turned off after a 30 second delay. When the lighting
switch is turned from OFF to 1ST or 2ND position (or if auto light system is activated) after illumination lamps
have been turned off by the battery saver control, the illumination lamps illuminate again.
Component Parts LocationINFOID:0000000001601381
ALLIA0424GB
1. BCM M18, M20 (view with instrument
lower panel LH removed) 2. IPDM E/R E122, E123, E124 3. Combination switch M28
4. Combination meter (illumination con- trol switch) M23, M24
AWLIA0398ZZ
Revision: March 2010 2008 QX56

INL-12
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (BCM)
DATA MONITOR
ACTIVE TEST
ROOM LAMP OFF TIME SETMODE 1 0.5 sec.
Sets the interior room lamp gradual dimming time.
MODE 2 1 sec.
MODE 3 2 sec.
MODE 4 3 sec.
MODE 5 4 sec.
MODE 6 5 sec.
MODE 7 0 sec.
Service item
Setting item Setting
Monitor item
[Unit] Description
IGN ON SW
[ON/OFF] The switch status input from ignition switch
KEY ON SW
[ON/OFF] Key switch status input from key slot
DOOR SW-DR
[ON/OFF] The switch status input from front door switch LH
DOOR SW-AS
[ON/OFF] The switch status input from front door switch RH
DOOR SW-RR
[ON/OFF] The switch status input from rear door switch RH
DOOR SW- RL
[ON/OFF] The switch status input from rear door switch LH
BACK DOOR SW
[ON/OFF] The switch status input from back door switch
KEY CYL LK-SW
[ON/OFF] Lock switch status received from key cylinder switch by power window serial link
KEY CYL UN-SW
[ON/OFF] Unlock switch status received from key cylinder switch by power window serial link
CDL LOCK SW
[ON/OFF] Lock switch status received from door lock/unlock switch by power window serial link
CDL UNLOCK SW
[ON/OFF] Unlock switch status received from door lock/unlock switch by power window serial
link
I-KEY LOCK
[ON/OFF] Lock signal status received from remote keyless entry receiver
I-KEY UNLOCK
[ON/OFF] Unlock signal status received from remote keyless entry receiver
Test item
Operation Description
INT LAMP ON
Outputs the interior room lamp control signal to turn the front room/map lamp, per-
sonal lamps (Map lamp switch is in DOOR position) and puddle lamps ON.
OFF Stops the interior room lamp control signal to turn the front room/map lamp, personal
lamps (Map lamp switch is in DOOR position) and puddle lamps OFF.
IGN ILLUM ON
Outputs the ignition keyhole illumination signal to turn the ignition keyhole illumination
ON.
OFF Stops the ignition keyhole illumination signal to turn the ignition keyhole illumination
OFF.
STEP LAMP TEST ON Outputs the step lamp control signal to turn the step lamps and foot lamps ON.
OFF Stops the step lamp control signal to turn the step lamps and foot lamps OFF.
Revision: March 2010 2008 QX56

DIAGNOSIS SYSTEM (BCM)INL-13
< FUNCTION DIAGNOSIS >
C
DE
F
G H
I
J
K
M A
B
INL
N
O P
BATTERY SAVER
BATTERY SAVER : CONSULT-III FunctionINFOID:0000000001601385
WORK SUPPORT
DATA MONITOR
ACTIVE TEST
LUGGAGE LAMP TEST ON Outputs the cargo lamp control signal to turn cargo lamp ON.
OFF Stops the cargo lamp control signal to turn cargo lamp OFF.
Test item
Operation Description
Service itemSetting item Setting
ROOM LAMP TIMER SET MODE 1
(ON)
Interior room lamp timer activates with synchronizing all doors.
MODE 2
(OFF) Interior room lamp timer activates with synchronizing the front door LH
only.
Monitor item
[Unit] Description
IGN ON SW
[ON/OFF] The switch status input from ignition switch
KEY ON SW
[ON/OFF] Key switch status input from key slot
DOOR SW-DR
[ON/OFF] The switch status input from front door switch LH
DOOR SW-AS
[ON/OFF] The switch status input from front door switch RH
DOOR SW-RR
[ON/OFF] The switch status input from rear door switch RH
DOOR SW- RL
[ON/OFF] The switch status input from rear door switch LH
BACK DOOR SW
[ON/OFF] The switch status input from back door switch
KEY CYL LK-SW
[ON/OFF] Lock switch status received from key cylinder switch by power window serial link
KEY CYL UN-SW
[ON/OFF] Unlock switch status received from key cylinder switch by power window serial link
CDL LOCK SW
[ON/OFF] Lock switch status received from door lock/unlock switch by power window serial link
CDL UNLOCK SW
[ON/OFF] Unlock switch status received from door lock/unlock switch by power window serial
link
I-KEY LOCK
[ON/OFF] Lock signal status received from remote keyless entry receiver
I-KEY UNLOCK
[ON/OFF] Unlock signal status received from remote keyless entry receiver
Test item
Operation Description
BATTERY SAVER ON Outputs the battery saver output/power supply to turn the interior lamps ON.
OFF Stops the battery saver output/power supply to turn the interior lamps OFF.
Revision: March 2010 2008 QX56

INTERIOR ROOM LAMP POWER SUPPLY CIRCUIT
INL-15
< COMPONENT DIAGNOSIS >
C
D E
F
G H
I
J
K
M A
B
INL
N
O P
INTERIOR ROOM LAMP POWER SUPPLY CIRCUIT
DescriptionINFOID:0000000001601387
Provides the battery saver output/power supply. Also cu ts the power supply when the interior room lamp bat-
tery saver is activating.
Component Function CheckINFOID:0000000001601388
1.CHECK BATTERY SAVER OUTPUT /POWER SUPPLY FUNCTION
CONSULT-III
1. Turn ignition switch ON.
2. Turn each interior room lamp ON.
- Front room/map lamp assembly
- Vanity lamps
- Personal lamp 2nd row
- Personal lamp 3rd row
- Cargo lamp
3. Open the driver door to turn ON the step lamps, foot lamps and puddle lamps.
- Front step lamps
- Rear step lamps
- Foot lamps
- Puddle lamps
- Ignition keyhole Illumination
4. Select “BATTERY SAVER” of BCM (BATTERY SAVER) active test item.
5. While operating the test item, check that each interior room lamp turns ON/OFF.
Is the inspection result normal?
YES >> Battery saver output/power supply circuit is normal.
NO >> Refer to INL-15, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001601389
1.CHECK BATTERY SAVER OUTPUT/POWER SUPPLY OUTPUT
CONSULT-III
1. Turn ignition switch ON.
2. Select “BATTERY SAVER” of BCM (BATTERY SAVER) active
test item.
3. While operating the test item, check voltage between BCM con-
nector M20 terminal 56 and ground.
Is the inspection result normal?
YES >> GO TO 2
NO >> Replace BCM. Refer to BCS-55, "
Removal and Installation".
2.CHECK BATTERY SAVER OUTPUT/P OWER SUPPLY OPEN CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the following connectors.
-BCM M20
- Ignition keyhole illumination OFF : Interior room lamps OFF
ON : Interior room lamps ON
(+)
(-)Te s t i t e m
Voltag e
Connector Terminal BATTERY SAVER
M20 56 Ground OFF
0V
ON Battery voltage
ALLIA0408GB
Revision: March 2010 2008 QX56

INL-16
< COMPONENT DIAGNOSIS >
INTERIOR ROOM LAMP POWER SUPPLY CIRCUIT
- Front step lamp LH
- Front step lamp RH
- Door mirror LH
- Door mirror RH
- Rear step lamp LH
- Rear step lamp RH
- Foot lamp LH
- Foot lamp RH
- Front room/map lamp assembly
- Vanity lamp LH
- Vanity lamp RH
- Cargo lamp
- Personal lamp 2nd row
- Personal lamp 3rd row
3. Check continuity between BCM connector M20 term inal 56 and each interior room lamp connector.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair the harness or connectors.
3.CHECK BATTERY SAVER OUTPUT/P OWER SUPPLY SHORT CIRCUIT
Check continuity between BCM connector M20 terminal 56 and
ground.
Is the inspection result normal?
YES >> Check that each interior room lamp has no internal short circuit.
NO >> Repair the harness or connectors.
BCM Interior room lamp
Continuity
Connector Terminal ConnectorTerminal
M20 56 Ignition keyhole illumination
M1501
Ye s
Front step lamp LH
D111
Front step lamp RH D1091
Door mirror LH D412
Door mirror RH D10712
Rear step lamp LH D2061
Rear step lamp RH D3061
Foot lamp LH M991
Foot lamp RH M1001
Front room/map lamp assembly R1026
Vanity lamp LH R31
Vanity lamp RH R81
Cargo lamp B1532
Personal lamp 2nd row R2033
Personal lamp 3rd row R2053
Connector Terminal —Continuity
M20 56Ground No
ALLIA0409GB
Revision: March 2010 2008 QX56

INTERIOR ROOM LAMP CONTROL CIRCUITINL-17
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K
M A
B
INL
N
O P
INTERIOR ROOM LAMP CONTROL CIRCUIT
DescriptionINFOID:0000000001601390
Controls the following interior room lamps (ground side) by PWM signal
• Puddle lamps
• Front room/map lamp assembly
• Personal lamp 2nd row
• Personal lamp 3rd row
NOTE:
PWM signal control period is approximately 250 Hz (in the gradual brightening/dimming).
Component Function CheckINFOID:0000000001601391
CAUTION:
Before performing the diagnosis, check that the following is normal.
• Battery saver output/power supply
• Front room/map lamp bulbs
• Personal lamp bulbs
• Puddle lamp bulbs
1.CHECK INTERIOR ROOM LAMP CONTROL FUNCTION
CONSULT-III
1. Switch the front room/map lamp assembly switch to DOOR.
2. Turn ignition switch ON.
3. Select “INT LAMP” of BCM (INT LAMP) active test item.
4. While operating the test item, check that each interi or room lamp turns ON/OFF (gradual brightening/dim-
ming).
Is the inspection result normal?
YES >> Interior room lamp control circuit is normal.
NO >> Refer to INL-17, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001601392
1.CHECK INTERIOR ROOM LAMP CONTROL OUTPUT
CONSULT-III
1. Switch the front room/map lamp assembly switch to DOOR.
2. Turn ignition switch ON.
3. Select “INT LAMP” of BCM (INT LAMP) active test item.
4. While operating the test item, check voltage between BCM con- nector M20 terminal 63 and ground.
Is the inspection result normal?
YES >> Interior room lamp control circuit is operating normally.
Fixed ON>>GO TO 3
Fixed OFF>>GO TO 2
2.CHECK INTERIOR ROOM LAMP CONTROL OPEN CIRCUIT ON : Interior room lamp gradual brightening
OFF : Interior room lamp gradual dimming
(+)
(-) INT LAMP Voltage
Connector Terminal
M20 63 Ground ON
0V
OFF Battery voltage
ALLIA0410GB
Revision: March 2010 2008 QX56

INL-18
< COMPONENT DIAGNOSIS >
INTERIOR ROOM LAMP CONTROL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector M20, door mirror connectors andfront room/map lamp assembly connector.
3. Check continuity between BCM connector M20 (A) terminal 63 and the door mirror connectors (B) and front room/map lamp
assembly connector (C).
4. Reconnect the front room/map lamp assembly connector.
5. Check continuity between BCM connector M20 (A) terminal 63 and the 2nd and 3rd row personal lamp connectors (B) terminal
1.
Is the inspection result normal?
YES >> Check interior room lamps for an open. If OK, replace BCM. Refer to BCS-55, "Removal and
Installation". If NG, replace interior room lamp. Refer to INL-59, "Removal and Installation".
NO >> Repair the harness or connectors.
3.CHECK INTERIOR ROOM LAMP CONTROL SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector M20, door mirror connectors and 2nd and 3rd row personal lamp connectors.
3. Switch the front room/map lamp assembly switch to ON posi- tion.
4. Check continuity between BCM connector M20 terminal 63 and ground.
Is the inspection result normal?
YES >> Check interior room lamps for a short circuit. If OK, replace BCM. Refer to BCS-55, "Removal and
Installation". If NG, replace interior room lamp. Refer to INL-59, "Removal and Installation".
NO >> Repair the harness or connectors.
BCM Interior room lamp
Continuity
Connector Terminal Component Connector Terminal
M20 (A) 63 Door mirror LH D4 (B) 13
Ye s
Door mirror RH D107 (B) 13
Front room/map
lamp assembly R102 (C) 1
AWLIA0968ZZ
BCM
Interior room lamp
Continuity
Connector Terminal Component Connector Terminal
M20 (A) 63 Personal lamp 2nd
row
R203 (B) 1
Ye s
Personal lamp 3rd
row R205 (B) 1
ALLIA0412GB
Connector
Terminal —Continuity
M20 63Ground No
ALLIA0413GB
Revision: March 2010 2008 QX56

STEP LAMP CIRCUITINL-19
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K
M A
B
INL
N
O P
STEP LAMP CIRCUIT
DescriptionINFOID:0000000001601393
Controls the front and rear step lamps and the foot lamps (ground side) to turn the lamps ON and OFF.
Component Function CheckINFOID:0000000001601394
CAUTION:
Before performing the diagnosis, check that the following is normal.
• Battery saver output/power supply
• Front step lamp bulbs
• Rear step lamp bulbs
• Foot lamp bulbs
1.CHECK STEP LAMP OPERATION
CONSULT-III
1. Turn ignition switch ON.
2. Select “STEP LAMP TEST” of BC M (INT LAMP) active test item.
3. While operating the test item, check that the front/rear step lamps and foot lamps turn ON/OFF.
Is the inspection result normal?
YES >> Step lamp circuit is normal.
NO >> Refer to INL-19, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001601395
1.CHECK STEP LAMP OUTPUT
CONSULT-III
1. Turn ignition switch ON.
2. Select “STEP LAMP TEST” of BC M (INT LAMP) active test item.
3. While operating the test item, check voltage between BCM har- ness connector M20 terminal 62 and ground.
Is the inspection result normal?
YES >> Step lamp circuit is operating normally.
Fixed ON>>GO TO 3
Fixed OFF>>GO TO 2
2.CHECK STEP LAMP OPEN CIRCUIT ON : Step lamp ON
OFF : Step lamp OFF
Connector Terminal —
STEP LAMP
TEST Vo l ta g e
M20 62 Ground ON
0V
OFF Battery voltage
ALLIA0414GB
Revision: March 2010 2008 QX56

INL-20
< COMPONENT DIAGNOSIS >
STEP LAMP CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector M20, front step lamp, rear step lampand foot lamp connectors.
3. Check continuity between BCM connector M20 (A) terminal 62 and step lamp connectors (B) and foot lamp connectors (C).
Is the inspection result normal?
YES >> Check step lamp or foot lamp for an open. If OK, replace BCM. Refer to BCS-55, "
Removal and Installation". If
NG, replace step lamp or foot lamp. Refer to INL-59,
"Removal and Installation".
NO >> Repair harness or connectors.
3.CHECK STEP LAMP SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector M20, front and rear step lamp con- nectors and foot lamp connectors.
3. Check continuity between BCM connector M20 terminal 62 and ground.
Is the inspection result normal?
YES >> Check step lamp or foot lamp for a short circuit. If OK, replace BCM. Refer to BCS-55, "
Removal and Installa-
tion". If NG, replace step lamp or foot lamp. Refer to INL-59, "Removal and Installation".
NO >> Repair the harness or connectors.
Connector Terminal ConnectorTerminal Continuity
M20 (A) 62 Front step lamp LH D11 (B) 2
Ye s
Front step lamp RH D109 (B) 2
Rear step lamp LH D206 (B) 2
Rear step lamp
RH D306 (B) 2
Foot lamp LH M99 (C) 2
Foot lamp RH M100 (C) 2
ALLIA0415GB
Connector Terminal —Continuity
M20 62Ground No
ALLIA0416GB
Revision: March 2010 2008 QX56