2009 INFINITI QX56 key battery

PRECAUTIONSHA-3
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005856236
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
 Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
 When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Precaution Necessary for Steering Wh eel Rotation After Battery Disconnect
INFOID:0000000005856237
NOTE:
 This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
 Remove and install all control units after disconnecti ng both battery cables with the ignition knob in the
″ LOCK ″ position.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS , an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
Revision: December 20092009 QX56

DIAGNOSIS SYSTEM (BCM)HAC-21
< FUNCTION DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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DIAGNOSIS SYSTEM (BCM)
CONSULT-III Function (BCM - COMMON ITEM)INFOID:0000000004335398
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with BCM.
SYSTEM APPLICATION
BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.
CONSULT-III Function (BCM - AUTO AIR CONDITIONER)INFOID:0000000004335399
DATA MONITOR
Diagnosis mode Function Description
WORK SUPPORT Changes the setting for each system function.
SELF-DIAG RESULTS Displays the diagnosis results judged by BCM. Refer to BCS-51, "
DTCIndex".
CAN DIAG SUPPORT MNTR Monitors the reception status of CAN communication viewed from BCM.
DATA MONITOR The BCM input/output signals are displayed.
ACTIVE TEST The signals used to activate each device are forcibly supplied from BCM.
ECU IDENTIFICATION The BCM pa rt number is displayed.
CONFIGURATION • Enables to read and save the vehicle specification.
• Enables to write the vehicle specification when replacing BCM.
System
Sub system selection item Diagnosis mode
WORK SUPPORT DATA MONITOR ACTIVE TEST
BCM BCM ×
Door lock DOOR LOCK ×××
Rear window defogger REAR DEFOGGER ×
Warning chime BUZZER ××
Interior room lamp timer INT LAMP ×××
Remote keyless entry system MULTI REMOTE ENT ××
Exterior lamp HEAD LAMP ×××
Wiper and washer WIPER ×××
Turn signal and hazard warning lamps FLASHER ××
Air conditioner AIR CONDITONER ×
Intelligent Key system INTELLIGENT KEY ×
Combination switch COMB SW ×
Immobilizer IMMU ××
Interior room lamp battery saver BATTERY SAVER ×××
Back door open TRUNK ××
RAP (retained accessory power) RETAINED PWR ×××
Signal buffer system SIGNAL BUFFER ××
TPMS (tire pressure monitoring sys-
tem) AIR PRESSURE MONITOR
×××
Vehicle security system PANIC ALARM ×
Revision: December 20092009 QX56

HRN-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005856032
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000005887777
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
4. Perform the necessary repair operation.
Revision: December 20092009 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 (BCM -
COMMON ITEM) .....................................................
11
INT LAMP .............................................................. ....11
INT LAMP : CONSULT-III Function (BCM - INT
LAMP) .....................................................................
12
BATTERY SAVER ................................................. ....13
BATTERY SAVER : CONSULT-III Function (BCM
- BATTERY SAVER) ...............................................
13
COMPONENT DIAGNOSIS .........................14
POWER SUPPLY AND GROUND CIRCUIT .. ....14
BCM ....................................................................... ....14
BCM : Diagnosis Procedure ....................................14
BATTERY SAVER OUTPUT/POWER SUP-
PLY CIRCUIT ................................................. ....
15
Description ........................................................... ....15
Component Function Check ....................................15
Diagnosis Procedure ...............................................15
INTERIOR ROOM LAMP CONTROL CIRCUIT
...
17
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
Reference Value .................................................. ....55
Terminal Layout .......................................................57
Physical Values ................................................... ....57
Wiring Diagram ........................................................63
Fail Safe ..................................................................67
DTC Inspection Priority Chart ...............................68
Revision: December 20092009 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:0000000003776241
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: December 20092009 QX56

DIAGNOSIS SYSTEM (BCM)INL-11
< FUNCTION DIAGNOSIS >
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DIAGNOSIS SYSTEM (BCM)
COMMON ITEM
COMMON ITEM : CONSULT-III Fu nction (BCM - COMMON ITEM)INFOID:0000000004109547
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with BCM.
SYSTEM APPLICATION
BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.
INT LAMP
Diagnosis mode Function Description
WORK SUPPORT Changes the setting for each system function.
SELF-DIAG RESULTS Displays the diagnosis results judged by BCM. Refer to BCS-51, "
DTCIndex".
CAN DIAG SUPPORT MNTR Monitors the reception status of CAN communication viewed from BCM.
DATA MONITOR The BCM input/output signals are displayed.
ACTIVE TEST The signals used to activate each device are forcibly supplied from BCM.
ECU IDENTIFICATION The BCM pa rt number is displayed.
CONFIGURATION • Enables to read and save the vehicle specification.
• Enables to write the vehicle specification when replacing BCM.
System
Sub system selection item Diagnosis mode
WORK SUPPORT DATA MONITOR ACTIVE TEST
BCM BCM ×
Door lock DOOR LOCK ×××
Rear window defogger REAR DEFOGGER ×
Warning chime BUZZER ××
Interior room lamp timer INT LAMP ×××
Remote keyless entry system MULTI REMOTE ENT ××
Exterior lamp HEAD LAMP ×××
Wiper and washer WIPER ×××
Turn signal and hazard warning lamps FLASHER ××
Air conditioner AIR CONDITONER ×
Intelligent Key system INTELLIGENT KEY ×
Combination switch COMB SW ×
Immobilizer IMMU ××
Interior room lamp battery saver BATTERY SAVER ×××
Back door open TRUNK ××
RAP (retained accessory power) RETAINED PWR ×××
Signal buffer system SIGNAL BUFFER ××
TPMS (tire pressure monitoring sys-
tem) AIR PRESSURE MONITOR
×××
Vehicle security system PANIC ALARM ×
Revision: December 20092009 QX56

DIAGNOSIS SYSTEM (BCM)INL-13
< FUNCTION DIAGNOSIS >
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ACTIVE TEST
BATTERY SAVER
BATTERY SAVER : CONSULT-III Function (BCM - BATTERY SAVER)INFOID:0000000004109549
WORK SUPPORT
*: Initial setting
DATA MONITOR
ACTIVE TEST
*: Each lamp switch is in ON position. Test Item
Operation Description
INT LAMP ON Outputs the interior room lamp control signal to turn the interior room lamps ON.
OFF Stops the interior room lamp control signal to turn the interior room lamps OFF.
IGN ILLUM ON
Outputs the ignition keyhole illumination control signal to turn the ignition keyhole il-
lumination lamp ON.
OFF Stops the ignition keyhole illumination control signal to turn the ignition keyhole illu-
mination lamp OFF.
STEP LAMP TEST ON Outputs the step lamp control signal to turn the step lamps ON.
OFF Stops the step lamp control signal to turn the step lamps OFF.
LUGGAGE LAMP TEST ON Outputs the luggage lamp control signal to turn the luggage lamp ON.
OFF Stops the luggage lamp control signal to turn the luggage lamp OFF.
Work Item Setting Item Setting
ROOM LAMP TIMER SET MODE 1* 15 min.
Sets the interior room lamp battery saver timer operating
time.
MODE 2 30 min.
Monitor Item
[Unit] Description
IGN ON SW [ON/OFF] Ignition switch (ON) status judges from IGN signal (ignition power supply)
KEY ON SW [ON/OFF] The switch status input from key switch
DOOR SW-DR [ON/OFF] The switch status input from front door switch (driver side)
DOOR SW-AS [ON/OFF] The switch status input from front door switch (passenger side)
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 input from door key cylinder switch
KEY CYL UN-SW [ON/OFF] Unlock switch status input from door key cylinder switch
CDL LOCK SW [ON/OFF] Lock switch status input from door lock and unlock switch
CDL UNLOCK SW [ON/OFF] Unlock switch status input from door lock and unlock switch
I-KEY LOCK [ON/OFF] Lock signal status received from Intelligent Key unit by CA N communication
I-KEY UNLOCK [ON/OFF] Unlock signal status received from Intelligen t Key unit by CAN communication
Test ItemOperation Description
BATTERY SAVER OFF Cuts the interior room lamp power supply to turn interior room lamps OFF.
ON Outputs the interior room lamp power supply to turn interior room lamps ON.*
Revision: December 20092009 QX56

BATTERY SAVER OUTPUT/POWER SUPPLY CIRCUITINL-15
< COMPONENT DIAGNOSIS >
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BATTERY SAVER OUTPUT/POWER SUPPLY CIRCUIT
DescriptionINFOID:0000000003776251
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:0000000003776252
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:0000000003776253
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-56, "
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: December 20092009 QX56