2008 INFINITI QX56 ignition

PRECAUTIONSHRN-3
< PRECAUTION >
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5. When the repair work is completed, return the ignition switch to the ″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of al l control units using CONSULT-III.
Revision: March 2010 2008 QX56

INL-1
DRIVER CONTROLS
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SECTION INL
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CONTENTS
INTERIOR LIGHTING SYSTEM
BASIC INSPECTION ....... .............................3
DIAGNOSIS AND REPAIR WORKFLOW ..... .....3
Work Flow ........................................................... ......3
FUNCTION DIAGNOSIS ...............................6
INTERIOR ROOM LAMP CONTROL SYSTEM
.....
6
System Diagram .................................................. ......6
System Description ...................................................6
Component Parts Location ........................................7
Component Description .............................................8
ILLUMINATION CONTROL SYSTEM .................9
System Diagram .................................................. ......9
System Description ...................................................9
Component Parts Location ........................................9
Component Description ...........................................10
DIAGNOSIS SYSTEM (BCM) ............................11
COMMON ITEM ..................................................... ....11
COMMON ITEM : CONSULT-III Function ...............11
INT LAMP .............................................................. ....11
INT LAMP : CONSULT-III Function ........................11
BATTERY SAVER ................................................. ....13
BATTERY SAVER : CONSULT-III Function ...........13
COMPONENT DIAGNOSIS .........................14
POWER SUPPLY AND GROUND CIRCUIT .. ....14
BCM ....................................................................... ....14
BCM : Inspection Procedure ...................................14
INTERIOR ROOM LAMP POWER SUPPLY
CIRCUIT ......................................................... ....
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Description .......................................................... ....15
Component Function Check ....................................15
Diagnosis Procedure ...............................................15
INTERIOR ROOM LAMP CONTROL CIRCUIT
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Description ........................................................... ....17
Component Function Check ....................................17
Diagnosis Procedure ...............................................17
STEP LAMP CIRCUIT .......................................19
Description ........................................................... ....19
Component Function Check ....................................19
Diagnosis Procedure ...............................................19
CARGO LAMP CONTROL CIRCUIT ................21
Description ...............................................................21
Component Function Check ....................................21
Diagnosis Procedure ...............................................21
IGNITION KEYHOLE ILLUMINATION CON-
TROL CIRCUIT .................................................
23
Description ...............................................................23
Component Function Check ....................................23
Diagnosis Procedure ...............................................23
INTERIOR ROOM LAMP CONTROL SYSTEM
...
25
Wiring Diagram .................................................... ....25
ILLUMINATION .................................................41
Wiring Diagram ........................................................41
ECU DIAGNOSIS .........................................55
BCM (BODY CONTROL MODULE) .................55
Description ........................................................... ....55
SYMPTOM DIAGNOSIS ..............................56
INTERIOR LIGHTING SYSTEM SYMPTOMS ...56
Symptom Table ................................................... ....56
PRECAUTION ..............................................57
PRECAUTIONS .................................................57
Revision: March 2010 2008 QX56

INL-6
< FUNCTION DIAGNOSIS >
INTERIOR ROOM LAMP CONTROL SYSTEM
FUNCTION DIAGNOSIS
INTERIOR ROOM LAMP CONTROL SYSTEM
System DiagramINFOID:0000000001601375
System DescriptionINFOID:0000000001601376
OUTLINE
• Interior room lamps* are controlled by the interior room lamp timer control function of the BCM.
*Front room/map lamps, personal lamp 2nd row, personal lamp 3rd row (when lamp switch is in DOOR posi-
tion) and puddle lamps.
• Cargo lamp is controlled by the cargo lamp control function of the BCM.
• Step lamps* are controlled by the step lamp control function of the BCM. *Front step lamps, rear step lamps and foot lamps.
The timer control functions of the BCM activate based on inputs from the remote keyless entry receiver, the
key cylinder lock/unlock switch, the door switc hes or the key switch and ignition knob switch.
ROOM LAMP TIMER OPERATION
When the interior room lamp switch is in the DOOR position and when all conditions below are met, the BCM
begins timer control (maximum 30 seconds) for interior room lamp ON/OFF.
• When the front door LH is unlocked [with Intelligent Key, main power window and door lock/unlock switch, or
front door lock assembly (key cylinder switch)].
• When a door opens → closes and the Intelligent Key is not inserted in the ignition switch.
Timer control is cancelled under the following conditions.
• When the front door LH is locked [with Intelligent Key, main power window and door lock/unlock switch, or
front door lock assembly (key cylinder switch)].
• A door is opened (door switch turns ON).
• Ignition switch is turned ON.
Interior lamp operational settings can be c hanged with the function setting of CONSULT-III.
AWLIA0965GB
Revision: March 2010 2008 QX56

INTERIOR ROOM LAMP CONTROL SYSTEMINL-7
< FUNCTION DIAGNOSIS >
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INTERIOR LAMP BATTERY SAVER CONTROL
If an interior lamp is left ON and does not turn OFF even when the doors are closed, the BCM turns off power
to the interior lamps automatically to save the batte ry 30 minutes after the ignition switch is turned OFF.
The BCM controls power and ground to all interior lamps.
After the battery saver system turns the la mps OFF, the lamps will illuminate again when
• a signal is received from an Intelligent Key or main power window and door lock/unlock switch, or when the
front door LH lock assembly (key cylinder switch) is locked or unlocked
• a door is opened or closed
• the Intelligent Key is removed from or inserted into the ignition switch.
The Interior lamp battery saver control time peri od can be changed with the function setting of CONSULT-III.
Component Parts LocationINFOID:0000000001601377
1. BCM M18, M19, M20 (view with instru-
ment lower panel LH removed) 2. Key switch and ignition knob switch
M12 3. Front door switch LH B8
Front door switch RH B108
4. Rear door switch LH B18 Rear door switch RH B116 5. Glass hatch ajar switch D707 6. Back door latch (door ajar switch)
D503
7. Front room/map lamp assembly R102 8. Vanity lamp LH R3 Vanity lamp RH R89. Door mirror (puddle lamp) LH D4
Door mirror (puddle lamp) RH D107
10. Ignition keyhole illumination M150 11. Foot lamp LH M99 Foot lamp RH M10012. Front step lamp LH D11
Front step lamp RH D109
AWLIA1062ZZ
Revision: March 2010 2008 QX56

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 >
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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 >
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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