INFINITI QX56 2011 Factory Service Manual

INL-4
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006216048
Component DescriptionINFOID:0000000006216049
1. BCMRefer to BCS-4, "
BODY CONTROL
SYSTEM : Componen t Parts Loca-
tion"
2. Personal lamp 3. Luggage room lamp
4. Remote keyless entry receiver Refer to DLK-11, "
DOOR LOCK
SYSTEM :
ComponentPartsLocation"
5. Back door lock assembly
(back door switch) 6. Automatic back door close switch
7. Door request switch 8. Door switch 9. Step lamp
10. Paddle lamp 11. Optical sensor 12. IPDM E/R Refer to PCS-4, "
Component Parts
Location"
13. Vanity mirror lamp 14. Combination meter 15. Combination switch
16. Front door lock assembly (driver
side) (door key cylinder switch, un-
lock sensor) 17. Door lock and unlock switch 18. Foot lamp
19. Push-button ignition switch 20. AV control unit Refer to AV- 9 , "
Component Parts Lo-
cation"
21. Map lamp
JMLIA0837ZZ
Part Description
BCM Controls the interior lighting system.
IPDM E/R Controls the integrated relay according to the request signal from BCM (via CAN com-
munication).
Remote keyless entry receiver Refer to DLK-12, "
DOOR LOCK SYSTEM : ComponentDescription".
AV control uni Receives the dimmer signal from BCM via CAN communication.
Optical sensor Refer to EXL-7, "
EXTERIOR LIGHTING SYSTEM : ComponentDescription".
Unlock sensor Detects door lock condition of driver side door.
Revision: 2010 May2011 QX56

COMPONENT PARTSINL-5
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Combination switch
(Lighting & turn signal switch) Refer to
BCS-7, "COMBINATION SWITCH READING SYSTEM : System Description".
 Door lock and unlock switch
 Door request switch
 Door key cylinder switch Inputs the lock/unlock signal to BCM.
 Door switch
 Back door switch Inputs the door switch signal to BCM.
Part Description
Revision: 2010 May2011 QX56

INL-6
< SYSTEM DESCRIPTION >
SYSTEM
SYSTEM
INTERIOR ROOM LAMP CONTROL SYSTEM
INTERIOR ROOM LAMP CONTROL SYSTEM : System DiagramINFOID:0000000006216050
INTERIOR ROOM LAMP CONTROL SYSTEM : System DescriptionINFOID:0000000006216051
OUTLINE
 Interior room lamps* are controlled by interi or room lamp timer control function of BCM.
*: Map lamp, foot lamp and personal lamp (when map lamp switch and personal lamp switch are in DOOR
position).
 Step lamp is controlled by step lamp control function of BCM.
 Luggage room lamp and automatic back door close switch illumination are controlled by luggage room lamp
control function of BCM.
 Puddle lamp is controlled by puddle lamp timer control function of BCM.
 Push-button ignition switch illumination is controlled by the push-button ignition switch illumination control
function of BCM and combination meter.
 Interior room lamps and puddle lamp are illuminated by welcome light function of Intelligent Key system.
Refer to DLK-26, "
WELCOME LIGHT FUNCTION : System Description".
INTERIOR ROOM LAMP TIMER CONTROL
JMLIA1188GB
Revision: 2010 May2011 QX56

SYSTEMINL-7
< SYSTEM DESCRIPTION >
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Interior Room Lamp Timer Basic Operation
NOTE:
A: Sets the interior room lamp gradual brightening and dimming time.
B: Gradually brightens from 0% to 100% and gradually dims from 100% to 0% in 1 second.
 The interior room lamp turns ON and OFF (gradual brightening and dimming) by the interior room lamp
timer.
 BCM judges the vehicle condition with the following items. It activates the interior room timer.
- Ignition switch status
- Door switch signal (except back door)
- Door lock/unlock signal (remote keyless entry receiv er, each door request switch, door key cylinder switch,
door lock/unlock switch)
NOTE:
Each function of interior room lamp ti mer can be set by CONSULT-III. Refer to INL-14, "
INT LAMP : CON-
SULT-III Function (BCM - INT LAMP)".
Interior Room Lamp ON Operation
 BCM always turns the interior room lamp ON when any door opens excepting back door.
 When all doors are closed, and any all door unlock operation is performed or ignition switch is turned OFF,
BCM brightens interior room lamp to 30% bri ghtness and maintains 30% brightness until any door opens.
 BCM activates the interior room timer in any of the fo llowing conditions to turn the interior room lamp ON for
a period of time.
- Any door opens before all doors close excepting back door.
- Ignition switch is turned ON → OFF.
- Any door unlock signal is detected when all doors cl ose excepting back door with ignition switch OFF.
NOTE:
The timer restarts if new condition is input during the timer operating time.
Interior Room Lamp OFF Operation
BCM stops the timer and turns interior room lamp OF F, when any of the following conditions is satisfied.
 The interior room lamp timer operating time is expired with all doors closed excepting back door.
 Ignition switch position is other than O FF with all doors close excepting back door.
 Any door lock signal is detected with all doors close excepting back door.
LUGGAGE ROOM LAMP CONTROL
BCM controls the luggage room lamp and automatic back door close switch illumination (ground-side) to turn
ON with back door switch ON.
 When luggage room lamp switch is turned to the ON position, luggage room lamp turns ON.
 When luggage room lamp switch is in the DOOR position and back door is opened, luggage room lamp turns ON.
 When back door is opened, automatic back door close switch illumination turn ON.
STEP LAMP CONTROL
BCM controls the step lamp (ground-side) to turn ON with any door switch ON excepting back door.
PUDDLE LAMP TIMER CONTROL
Puddle Lamp Timer Basic Operation
 BCM controls the ground to turn the puddle lamp ON.
JMLIA0961GB
Revision: 2010 May2011 QX56

INL-8
< SYSTEM DESCRIPTION >
SYSTEM
 The puddle lamp turns ON and OFF by the puddle lamp timer.
 BCM judges the vehicle condition with the following items. It activates the puddle lamp timer.
- Ignition switch status
- Door switch signal (except back door)
- Door lock/unlock signal (remote keyless entry receiver, each door request switch)
- Driver side door lock status
Puddle Lamp ON Operation
BCM activates the puddle lamp timer in any of the following conditions to turn the puddle lamp ON for a period
of time.
 Any door opens excepting back door.
 Any door opens before all doors close excepting back door.
 Ignition switch is turned ON → OFF.
 Door unlock signal by remote keyless entry rece iver or each door request switch is detected.
 Driver side door is locked*.
NOTE:
The timer restarts if new condition is input during the timer operating time.
Puddle Lamp OFF Operation
BCM stops the timer and turns puddle lamp OFF, when any of the following conditions are satisfied.
 The puddle lamp timer operating time is expired.
 The interior room lamp OFF conditions.
 The interior room lamp timer operating time is expired.
PUSH-BUTTON IGNITION SWITCH ILLUMINATION CONTROL
Push-button Ignition Switch Illumination Basic Operation
 BCM controls the ON/OFF status of push-button igni tion switch illumination according to vehicle status.
 BCM provides the push-button ignition switch illumi nation control signal and the ground to turn the push-but-
ton ignition switch illumination ON.
 BCM cuts the ground supply while each illumination (tai l lamp) is ON. BCM switches to the ground control
according to the meter illumination control function. Refer to MWI-16, "
METER ILLUMINATION CONTROL :
System Description".
Heart Beat Operation
BCM repeats brightening and dimming operation of push-button ignition switch illumination when any of the
following conditions are satisfied.
 Welcome light function operates.
 When ignition switch is OFF and any of the following conditions are satisfied.
- Driver side door changes from closed to open
- Driver side door changes from locked to unlocked
- Intelligent Key ID comparison is OK and driver side door changes from open to closed
- ID comparison by Intelligent Key transponder is OK
Illumination ON Operation
When ignition switch is not OFF or tail lamp turns ON, push-button ignition switch illumination turns ON.
Dimming Operation
When tail lamp turns OFF and ignition switch is turned OFF, push-button ignition switch illumination dims to
50% brightness.
Illumination OFF Operation
Push-button ignition switch illumination turns OFF when ignition switch turns OFF and tail lamp turns from ON
to OFF, while push-button ignition switch illumination is in ON status.
When push-button ignition switch illumination is at 50% brightness or in heartbeat status, and any of the fol-
lowing conditions are satisfied, push-butt on ignition switch illumination turns OFF.
 15 seconds after start of heartbeat operation.
 When welcome light function is not operating and any on the following conditions is satisfied.
- Driver side door is closed
- Driver side door is locked
- Intelligent Key ID comparison is NG
- Comparison of Intelligent Key ID by transponder is NG
INTERIOR ROOM LAMP BATTERY SAVER SYSTEM
Revision: 2010 May2011 QX56

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INTERIOR ROOM LAMP BATTERY SAVER SYSTEM : System DiagramINFOID:0000000006216052
INTERIOR ROOM LAMP BATTERY SA VER SYSTEM : System Description
INFOID:0000000006216053
OUTLINE
 Interior room lamp battery saver is controlled by BCM.
 BCM turns applicable lamps OFF depending on the vehicle condition. This function prevents the battery
from over-discharging if the driver neglects turning OFF the any lamps.
Applicable lamps
 Map lamp
 Personal lamp
 Foot lamp
 Luggage room lamp
 Automatic back door close switch illumination
 Step lamp
 Puddle lamp
 Vanity mirror lamp
INTERIOR ROOM LAMP BATTERY SAVER FUNCTION
 When the ignition switch is turned to a position other than ON, BCM operates the timer for a period of time to
cut the interior room lamp power supply.
 BCM restart the timer when any of the following signals changes while operating the timer.
- Push-button ignition switch status
- Door switch signal (ALL)
- Door lock/unlock signal (remote keyless entry re ceiver, each door request switch, door lock and unlock
switch, door key cylinder switch)
 BCM provides the interior room lamp power supply continuously when the ignition switch position is ON.
 When welcome light function operates.
NOTE:
JMLIA1189GB
Revision: 2010 May2011 QX56

INL-10
< SYSTEM DESCRIPTION >
SYSTEM
Each function of interior room lamp battery saver can be set by CONSULT-III. Refer to INL-15, "BATTERY
SAVER : CONSULT-III Function (BCM - BATTERY SAVER)".
ILLUMINATION CONTROL SYSTEM
ILLUMINATION CONTROL SYSTEM : System DiagramINFOID:0000000006216054
ILLUMINATION CONTROL SYS TEM : System DescriptionINFOID:0000000006216055
OUTLINE
Each illumination lamp is controlled by each function of BCM, IPDM E/R and combination meter.
Control by BCM Combination switch reading function
 Headlamp control function
Control by IPDM E/R Relay control function
Control by combination meter Meter illumination control function (Refer to MWI-16, "METER ILLUMINATION CONTROL : System Descrip-
tion".)
ILLUMINATION CONTROL
 BCM detects the combination switch conditi on by the combination switch reading function.
 BCM transmits position light request signal to IPDM E/R and combination meter according to tail lamp ON
condition.
Tail lamp ON condition- Lighting switch 1ST
- Lighting switch 2ND
- Lighting switch AUTO, and the auto light function ON judgment
- Lighting switch AUTO, with the front fog lamp switch ON and the ignition switch ON
 IPDM E/R turns the integrated tail lamp relay ON acco rding to position light request signal. It provides the
power supply to each illumination lamp.
 Combination meter enters in the nighttime mode accord ing to position light request signal. Under the night-
time mode the combination meter controls the illu minance by controlling each illumination lamp (ground
side).
AUTO LIGHT ADJUSTMENT SYSTEM
JPLIA0855GB
Revision: 2010 May2011 QX56

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AUTO LIGHT ADJUSTMENT SYSTEM : System DiagramINFOID:0000000006216056
AUTO LIGHT ADJUSTMENT SYSTEM : System DescriptionINFOID:0000000006216057
OUTLINE
Auto light adjustment system is controlled by each f unction of BCM, combination meter and AV control unit
Control by BCM Auto light system
 Auto light adjustment system
AUTO LIGHT ADJUSTMENT SYSTEM
Description
 BCM supplies voltage to the optical sensor when the ignition switch is turned ON or ACC.
 Optical sensor converts outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.
 BCM judges dimming/brightening of combination meter and display according to brightness outside the vehi- cle, when ignition switch is ON.
 BCM transmits dimmer signal to combination meter via CAN communication, according to auto light adjust- ment conditions. Dimmer signal is also transmitted to AV control unit.
NOTE:
As to dimming/brightening timing, the sensitivity depends on settings. The settings can be changed with CON-
SULT-III. Refer to EXL-23, "
HEADLAMP : CONSULT-III F unction (BCM - HEAD LAMP)".
Auto Light Adjustment Timing Table
When the ignition switch is ON, the illumination of co mbination meter and display switches dimming/brighten-
ing in the following condition.
BCM switches the illumination of combination me ter and display to dimming when outside brightening
obtained from the optical sensor signal is 1250 lx or le ss for 3 seconds or more. And BCM switches the illumi-
nation of combination meter and display to brightening when outside brightening from the optical sensor signal
is 2500 lx or more for 5 seconds or more.
JMLIA0967GB
Combination meter and display Dimming/brightening timing
Dimming Outside brightness is 1250 lx or less for 3 seconds or more.
Brightening Outside brightness is 2500 lx or more for 5 seconds or more.
Revision: 2010 May2011 QX56

INL-12
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (BCM)
DIAGNOSIS SYSTEM (BCM)
COMMON ITEM
COMMON ITEM : CONSULT-III Function (BCM - COMMON ITEM)INFOID:0000000006368143
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.
×: Applicable item
*: This item is indicated, but not used.
FREEZE FRAME DATA (FFD)
The BCM records the following vehicle condition at the time a particular DTC is detected, and displays on
CONSULT-III.
Diagnosis mode Function Description
Work Support Changes the setting for each system function.
Self Diagnostic Result Displays the diagnosis results judged by BCM. Refer to BCS-57, "
DTCIndex".
CAN Diag Support Monitor Monitors the reception status of CAN communication viewed from BCM. Refer to CONSULT-III opera-
tion manual.
Data Monitor The BCM input/output signals are displayed.
Active Test The signals used to activate ea ch device are forcibly supplied from BCM.
Ecu Identification The BCM part number is displayed.
Configuration  Read and save the vehicle specification.
 Write the vehicle specification when replacing BCM.
System Sub system selection item Diagnosis mode
Work Support Data Monitor Active Test
Door lock DOOR LOCK ×××
Rear window defogger REAR DEFOGGER ××
Warning chime BUZZER ××
Interior room lamp timer INT LAMP ×××
Exterior lamp HEAD LAMP ×××
Wiper and washer WIPER ×××
Turn signal and hazard warning lamps FLASHER ×××
— AIR CONDITONER* ××
 Intelligent Key system
 Engine start system INTELLIGENT KEY
×××
Combination switch COMB SW ×
Body control system BCM ×
IVIS IMMU ×××
Interior room lamp battery saver BATTERY SAVER ×××
Back door TRUNK ×
Vehicle security system THEFT ALM ×××
RAP system RETAINED PWR ×
Signal buffer system SIGNAL BUFFER ××
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (BCM)INL-13
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INT LAMP
CONSULT screen item Indication/Unit Description
Vehicle Speed km/h Vehicle speed of the moment a particular DTC is detected
Odo/Trip Meter km Total mileage (Odometer value) of the moment a particular DTC is detected
Vehicle Condition SLEEP>LOCK
Power position status of
the moment a particular
DTC is detected While turning BCM status from low power consumption mode to
normal mode (Power supply position is “LOCK”)
SLEEP>OFF While turning BCM status from low power consumption mode to
normal mode (Power supply position is “OFF”.)
LOCK>ACC While turning power supply position from “LOCK” to “ACC”
ACC>ON While turning power supply position from “ACC” to “IGN”
RUN>ACC While turning power supply position
from “RUN” to “ACC” (Vehicle
is stopping and selector lever is except P position.)
CRANK>RUN While turning power su
pply position from “CRANKING” to “RUN”
(From cranking up the engine to run it)
RUN>URGENT While turning power su
pply position from “RUN“ to “ACC” (Emer-
gency stop operation)
ACC>OFF While turning power supply position from “ACC” to “OFF”
OFF>LOCK While turning power supply position from “OFF” to “LOCK”
OFF>ACC While turning power supply position from “OFF” to “ACC”
ON>CRANK While turning po wer supply position from “IGN” to “CRANKING”
OFF>SLEEP While turning BCM status from normal mode (Power supply posi-
tion is “OFF”.) to low power consumption mode
LOCK>SLEEP While turning BCM status from normal mode (Power supply posi-
tion is “LOCK”.) to low power consumption mode
LOCK Power supply position is “LOCK” (Ignition switch OFF with steer-
ing is locked.)
OFF Power supply position
is “OFF” (Ignition switch OFF with steering
is unlocked.)
ACC Power supply position is “ACC” (Ignition switch ACC)
ON Power supply position is “IGN” (Ignition switch ON with engine
stopped)
ENGINE RUN Power supply posi
tion is “RUN” (Ignition switch ON with engine
running)
CRANKING Power supply position is “CRANKING” (At engine cranking)
IGN Counter 0 - 39 The number of times that ignition switch is turned ON after DTC is detected
 The number is 0 when a malfunction is detected now.
 The number increases like 1
→ 2 → 3...38 → 39 after returning to the normal condition
whenever ignition switch OFF → ON.
 The number is fixed to 39 until the self-diagnosis results are erased if it is over 39.
Revision: 2010 May2011 QX56