2009 INFINITI QX56 diagram

HEADLAMPEXL-7
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FUNCTION DIAGNOSIS
HEADLAMP
System DiagramINFOID:0000000005867511
System DescriptionINFOID:0000000005867512
Control of the headlamp system operation is dependent upon t he position of the combination switch (lighting
and turn signal switch). When the combination switch (lighting and turn signal switch) is placed in the 2nd posi-
tion, the BCM (body control module) receives input requesting the headlamps and park 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 headlamp LH high,
headlamp RH high and headlamp low relay coils. When energiz ed, these relays direct power to the respective
headlamps, which then illuminate.
Component Parts LocationINFOID:0000000005867513
Component DescriptionINFOID:0000000005867514
XENON HEADLAMP
AWLIA1755GB
1. BCM M18, M20 (view with instrument
panel removed) 2. IPDM E/R E122, E123, E124 3. Combination switch (lighting and turn
signal switch) M28
4. Combination meter M23, M24
AWLIA1625ZZ
Revision: December 20092009 QX56

DAYTIME LIGHT SYSTEMEXL-9
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DAYTIME LIGHT SYSTEM
System DiagramINFOID:0000000003776148
System DescriptionINFOID:0000000003776149
The headlamp system for Canada vehicles is equipped with a daytime light control unit that activates the high
beam headlamps at approximately half illumination whenever the engine is operating. If the parking brake is
applied before the engine is started the daytime lights will not be illuminated. The daytime lights will illuminate
once the parking brake is released. Thereafter, the daytime lights will continue to operate when the parking
brake is applied.
Component Parts LocationINFOID:0000000003776150
AWLIA1596GB
AWLIA1626ZZ
Revision: December 20092009 QX56

AUTO LIGHT SYSTEMEXL-11
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AUTO LIGHT SYSTEM
System DiagramINFOID:0000000005867516
System DescriptionINFOID:0000000003776153
• BCM (Body Control Module) controls auto light operati on according to signals from optical sensor, lighting
switch and ignition switch.
• IPDM E/R (Intelligent Power Distribution Module Engine Room) operates parking, license plate, tail and
headlamps according to CAN communication signals from BCM.
• Optical sensor detects ambient br ightness and converts light (lux) to voltage, then sends the optical sensor
signal to BCM.
OUTLINE
The auto light control system has an optical sensor that detects outside brightness.
When the lighting switch is in AUTO position, it automat ically turns ON/OFF the parking, license plate, tail and
headlamps in accordance with the ambient light. Sensitivity can be adjusted in four steps. For the details of the
setting, Refer to EXL-22, "
HEADLAMP : CONSULT-III F unction (BCM - HEAD LAMP)".
AWLIA1752GB
Revision: December 20092009 QX56

HEADLAMP AIMING SYSTEM (MANUAL)EXL-13
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HEADLAMP AIMING SYSTEM (MANUAL)
System DiagramINFOID:0000000003776156
System DescriptionINFOID:0000000003776157
The headlamp aiming system (manual) controls the headlamp light axis height according to input from the
headlamp aimer switch. The variable internal resist ance of the headlamp aimer switch controls the signal
ground of the headlamp aiming motors located on the front combination lamp LH and RH.
Component Parts LocationINFOID:0000000004216243
Component DescriptionINFOID:0000000003776158
AWLIA1629GB
1. BCM M18, M20 (view with instrument
panel removed) 2. IPDM E/R E122, E123, E124 3. Combination switch M28
4. Headlamp aiming switch M148
AWLIA0508ZZ
Part Description
Headlamp aiming motor Moves the headlamp up/down based on input from the headlamp aimer switch.
Headlamp aimer switch Controls variable ground to the headlamp aiming motor signal to move the headlamp aim-
ing motor up/down.
Revision: December 20092009 QX56

EXL-14
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FRONT FOG LAMP
FRONT FOG LAMP
System DiagramINFOID:0000000003776159
System DescriptionINFOID:0000000003776160
The front fog lamps are activated with the lighting switch (combination switch). The lighting switch signal to
the BCM is monitored with the BCM combination swit ch reading function. When the fog lamps are turned ON
with the lighting switch, the BCM sends a front fog la mp request signal via CAN communication lines to the
IPDM E/R. The IPDM E/R grounds the front fog la mp relay coil to activate the front fog lamps.
Component Parts LocationINFOID:0000000003776161
Component DescriptionINFOID:0000000003776162
FRONT FOG LAMP OPERATION
When the lighting switch is in front fog lamp ON posit ion and also in 1ST or 2ND position or AUTO position
(headlamp is ON), the BCM detects FR FOG ON and the HEAD LAMP1, 2 ON or the AUTO LIGHT ON. The
BCM sends a front fog lamp request ON signal via the CAN communication lines to the IPDM E/R. The IPDM
E/R then turns ON the front fog lamp relay sending power to the front fog lamps.
JPLIA0004GB
1. BCM M18, M20 (view with instrument
panel removed) 2. IPDM E/R E122, E123, E124 3. Combination switch M28
AWNIA0509ZZ
Revision: December 20092009 QX56

TURN SIGNAL AND HAZARD WARNING LAMPSEXL-15
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TURN SIGNAL AND HA ZARD WARNING LAMPS
System DiagramINFOID:0000000003776163
System DescriptionINFOID:0000000003776164
TURN SIGNAL OPERATION
When the turn signal switch is in LH or RH position with the ignition switch in ON position, the BCM detects the
TURN RH or TURN LH ON request. The BCM outputs the fl asher signal to the respective turn signal lamp.
The BCM also sends a turn indicator signal ON reques t via the CAN communication lines to the combination
meter. The combination meter then activates the appropriate turn signal indicator and audible buzzer.
HAZARD LAMP OPERATION
When the hazard switch is in ON position, the BCM detects the hazard switch signal ON. The BCM outputs the
flasher signal (right and left). The BCM sends a hazar d indicator signal ON request via the CAN communica-
tion lines to the combination meter. The combinati on meter then activates the hazard indicator and audible
buzzer.
REMOTE KEYLESS ENTRY OPERATION
The remote keyless entry receiver transmits a hazard request signal to the BCM, then BCM controls hazard
lamps.
Refer to SEC-7, "
System Description".
Component Parts LocationINFOID:0000000003776165
AWLIA0006GB
AWLIA1628ZZ
Revision: December 20092009 QX56

PARKING, LICENSE PLATE AND TAIL LAMPS
EXL-17
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PARKING, LICENSE PLATE AND TAIL LAMPS
System DiagramINFOID:0000000003776167
System DescriptionINFOID:0000000003776168
PARKING, LICENSE PLATE AND TAIL LAMPS OPERATION
When the lighting switch is in 1ST position, BCM detects the LIGHTING SWITCH 1ST POSITION ON. The
BCM sends a parking light ON request via the CAN comm unication lines to the IPDM E/R. The IPDM E/R then
activates the tail lamp relay which sends power to the parking and instrument illumination circuits.
EXTERIOR LAMP BATTERY SAVER CONTROL
With the lighting switch (combination switch) in the 2nd position and the ignition switch is turned from ON or
ACC to OFF, the battery saver feature is activated.
Under this condition, the headlamps remain illuminated for 5 minutes unless the lighting switch position is
changed. If the lighting switch position is changed, then the headlamps are turned off.
This setting can be changed by CONSULT-III. Refer to BCS-25, "
BATTERY SAVER : CONSULT-III Function
(BCM - BATTERY SAVER)".
Component Parts LocationINFOID:0000000004225343
AWLIA0013GB
1. BCM M18, M20 (view with instrument
panel removed) 2. IPDM E/R E122, E123, E124 3. Combination switch M28
AWNIA0509ZZ
Revision: December 20092009 QX56

TRAILER TOWEXL-19
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TRAILER TOW
System DiagramINFOID:0000000005867517
System DescriptionINFOID:0000000005867518
TRAILER TAIL LAMP OPERATION
The trailer tail lamps are controlled by the trailer tow re lay 1 located behind the left side of the instrument panel
(IP). With the combination switch in the 1st position, the BCM detects the LI GHTING SWITCH 1ST POSITION
ON. The BCM sends a parking light ON request via the CAN communication lines to the IPDM E/R. The IPDM
E/R then activates the tail lamp relay which activates t he trailer tow relay 1 and sends power to the trailer con-
nector.
TRAILER TURN SIGNAL LAMP OPERATION
The trailer turn signal lamps are controlled by the BCM. When the turn signal switch is in the LH or RH position
with the ignition switch ON, the combination switch sends a signal to the BCM. The BCM detects the TURN
RH or TURN LH ON request. The BCM sends a control signal to the respective trailer turn relay which sends
power to the trailer connector.
TRAILER HAZARD LAMP OPERATION
The trailer hazard lamps are controlled by the BCM. When the hazard switch is pressed, the BCM detects the
the hazard ON request. The BCM then sends a control signal to both trailer turn relays which sends power to
the trailer connector.
TRAILER BRAKE LAMP OPERATION
The trailer brake lamps are controlled by the BCM. W hen the brake pedal is depressed, the combination meter
receives a stop lamp switch signal from the stop lamp switch. The combination meter then sends the brake
signal to the BCM via the CAN communication lines. The BCM then sends a control signal to both trailer turn
relays which sends power to the trailer connector.
AWLIA1764GB
Revision: December 20092009 QX56