2010 INFINITI QX56 diagram

INL-6
< FUNCTION DIAGNOSIS >
INTERIOR ROOM LAMP CONTROL SYSTEM
FUNCTION DIAGNOSIS
INTERIOR ROOM LAMP CONTROL SYSTEM
System DiagramINFOID:0000000005146715
System DescriptionINFOID:0000000005146716
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 LH (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 LH (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.
AWLIA1595GB
Revision: April 20092010 QX56

ILLUMINATION CONTROL SYSTEMINL-9
< FUNCTION DIAGNOSIS >
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ILLUMINATION CONTROL SYSTEM
System DiagramINFOID:0000000005358668
System DescriptionINFOID:0000000005358669
The illumination lamps operation is dependent upon the posit ion of the combination switch (lighting and turn
signal switch). When the combination switch (lighting and turn signal switch) is placed in the 1ST or 2ND posi-
tion (or if the auto light system is activated) the BCM (body control modul e) 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 combination switch (lighting and turn signal s witch) is in the 1ST or 2ND position and the ignition
switch is turned from ON or ACC to OFF, the battery saver control feature is activated. Under this condition,
the illumination lamps remain illuminated for 30 minutes unless the combination switch (lighting and turn signal
switch) position is changed. If the combination switch (lighting and turn signal switch) position is changed, then
the illumination lamps are turned off after a 30 second delay. When the combination switch (lighting and turn
signal 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 c ontrol, the illumination lamps illuminate again.
Component Parts LocationINFOID:0000000005146721
AWLIA1754GB
AWLIA0398ZZ
Revision: April 20092010 QX56

POWER SUPPLY AND GROUND CIRCUITINL-15
< COMPONENT DIAGNOSIS >
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COMPONENT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
BCM
BCM : Diagnosis ProcedureINFOID:0000000005356487
Regarding Wiring Diagram information, refer to BCS-49, "Wiring Diagram".
1. CHECK FUSES AND FUSIBLE LINK
Check that the following fuses and fusible link are not blown.
Is the fuse blown?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit.
NO >> GO TO 2
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM harness connector and ground.
Is the measurement value normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
Terminal No. Signal nameFuses and fusible link No.
57 Battery power supply 22 (15A)
70 F (50A)
11 Ignition ACC or ON 4 (10A)
38 Ignition ON or START 59 (10A)
ConnectorTe r m i n a l s
Power
source Condition Voltage (V) (Ap-
prox.)
(+) (-)
M18 11 Ground
ACC
power
supply Ignition
switch
ACC or ON Battery voltage
38 Ground Ignition
power
supply Ignition
switch ON
or START Battery voltage
M20 57 Ground
Battery
power
supply Ignition
switch OFF Battery voltage
70 Ground Battery
power
supply Ignition
switch OFF Battery voltage
LIIA2415E
Revision: April 20092010 QX56

BATTERY SAVER OUTPUT/POWER SUPPLY CIRCUITINL-17
< COMPONENT DIAGNOSIS >
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BATTERY SAVER OUTPUT/POWER SUPPLY CIRCUIT
DescriptionINFOID:0000000005146727
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:0000000005146728
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-17, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005146729
Regarding Wiring Diagram information, refer to BCS-49, "Wiring Diagram".
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-59, "
Removal and Installation".
2.CHECK BATTERY SAVER OUTPUT/P OWER SUPPLY OPEN CIRCUIT
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: April 20092010 QX56

INTERIOR ROOM LAMP CONTROL CIRCUITINL-19
< COMPONENT DIAGNOSIS >
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INTERIOR ROOM LAMP CONTROL CIRCUIT
DescriptionINFOID:0000000005146730
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:0000000005146731
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-19, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005146732
Regarding Wiring Diagram information, refer to INL-28, "Wiring Diagram".
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 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: April 20092010 QX56

INL-22
< COMPONENT DIAGNOSIS >
STEP LAMP CIRCUIT
STEP LAMP CIRCUIT
DescriptionINFOID:0000000005146733
Controls the front and rear step lamps and the foot lamps (ground side) to turn the lamps ON and OFF.
Component Function CheckINFOID:0000000005146734
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 BCM (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-22, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005146735
Regarding Wiring Diagram information, refer to INL-28, "Wiring Diagram".
1.CHECK STEP LAMP OUTPUT
CONSULT-III
1. Turn ignition switch ON.
2. Select “STEP LAMP TEST” of BCM (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 Voltag e
M20 62 Ground ON
0V
OFF Battery voltage
ALLIA0414GB
Revision: April 20092010 QX56

INL-24
< COMPONENT DIAGNOSIS >
CARGO LAMP CONTROL CIRCUIT
CARGO LAMP CONTROL CIRCUIT
DescriptionINFOID:0000000005146736
Controls the cargo lamp (ground side) to turn the cargo lamp ON and OFF.
Component Function CheckINFOID:0000000005146737
CAUTION:
Before performing the diagnosis, check that the following is normal.
• Battery saver output/power supply
• Cargo lamp bulb
1.CHECK CARGO LAMP OPERATION
CONSULT-III
1. Turn ignition switch ON.
2. Select “LUGGAGE LAMP TEST” of BCM (INT LAMP) active test item.
3. While operating the test item, che ck that cargo lamp turns ON/OFF.
Is the inspection result normal?
YES >> Cargo lamp circuit is normal.
NO >> Refer to INL-22, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005146738
Regarding Wiring Diagram information, refer to INL-28, "Wiring Diagram".
1.CHECK CARGO LAMP OUTPUT
CONSULT-III
1. Turn ignition switch ON.
2. Select “LUGGAGE LAMP TEST” of BCM (INT LAMP) active test
item.
3. While operating the test item, check voltage between BCM con-
nector M19 terminal 49 and ground.
Is the inspection result normal?
YES >> Cargo lamp control circuit is operating normally.
Fixed ON>>GO TO 3
Fixed OFF>>GO TO 2
2.CHECK CARGO LAMP OPEN CIRCUIT ON : Cargo lamp ON
OFF : Cargo lamp OFF
Connector Terminal —
LUGGAGE
LAMP TEST Voltag e
M19 49 Ground ON
0V
OFF Battery voltage
ALLIA0417GB
Revision: April 20092010 QX56

INL-26
< COMPONENT DIAGNOSIS >
IGNITION KEYHOLE ILLUMINATION CONTROL CIRCUIT
IGNITION KEYHOLE ILLUMINATION CONTROL CIRCUIT
DescriptionINFOID:0000000005146739
Controls the ignition keyhole illumination (ground side) to turn the ignition keyhole illumination ON and OFF.
Component Function CheckINFOID:0000000005146740
CAUTION:
Before performing the diagnosis, check that the following is normal.
• Battery saver output/power supply circuit
• Ignition keyhole illumination bulb
1.CHECK IGNITION KEYHOLE ILLUMINATION OPERATION
CONSULT-III
1. Turn the ignition switch ON.
2. Select “IGN ILLUM” of BCM (INT LAMP) active test item.
3. While operating the test item , check that the ignition keyhole illumination turns ON/OFF
Is the inspection result normal?
YES >> Ignition keyhole illumination circuit is normal.
NO >> Refer to INL-26, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005146741
Regarding Wiring Diagram information, refer to INL-28, "Wiring Diagram".
1.CHECK IGNITION KEYHOLE OUTPUT
CONSULT-III
1. Turn ignition switch ON.
2. Select “IGN ILLUM” of BCM (INT LAMP) active test item.
3. While operating the test item, check voltage between BCM con- nector M18 terminal 1 and ground.
Is the inspection result normal?
YES >> Ignition keyhole illumination control circuit is operating normally.
Fixed ON>>GO TO 3
Fixed OFF>>GO TO 2
2.CHECK IGNITION KEYHOLE ILLUMINATION OPEN CIRCUIT ON : Ignition keyhole illumination ON
OFF : Ignition keyhole illumination OFF
Connector Terminal — IGN ILLUM Voltage
M18 1 Ground ON
0V
OFF Battery voltage
ALLIA0420GB
Revision: April 20092010 QX56