diagram INFINITI QX56 2010 Factory Service Manual

EXL-14
< FUNCTION DIAGNOSIS >
FRONT FOG LAMP
FRONT FOG LAMP
System DiagramINFOID:0000000005369879
System DescriptionINFOID:0000000005369880
The front fog lamps are activated with the combination switch (lighting and turn signal switch). The combina-
tion switch (lighting and turn signal switch) signal to the BCM is monitored with the BCM combination switch
reading function. When the fog lamps are turned ON wit h the combination switch (lighting and turn signal
switch), the BCM sends a front fog lamp request signal via CAN communication lines to the IPDM E/R. The
IPDM E/R grounds the front fog lamp relay coil to activate the front fog lamps.
Component Parts LocationINFOID:0000000005146622
Component DescriptionINFOID:0000000005369881
FRONT FOG LAMP OPERATION
When the combination switch (lighting and turn signal switch) is in front fog lamp ON position 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 t he front fog lamp relay sending power to the front fog
lamps.
AWLIA1719GB
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
AWNIA0509ZZ
Revision: April 20092010 QX56

TURN SIGNAL AND HAZARD WARNING LAMPSEXL-15
< FUNCTION DIAGNOSIS >
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TURN SIGNAL AND HA ZARD WARNING LAMPS
System DiagramINFOID:0000000005146624
System DescriptionINFOID:0000000005146625
TURN SIGNAL OPERATION
When the combination switch (lighting and 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 flasher signal to
the respective turn signal lamp. The BCM also sends a turn indicator signal ON request via the CAN commu-
nication lines to the combination meter. The combination meter then activates the appropriate turn signal indi-
cator 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-10, "
System Description".
Component Parts LocationINFOID:0000000005146626
AWLIA1721GB
AWLIA1628ZZ
Revision: April 20092010 QX56

PARKING, LICENSE PLATE AND TAIL LAMPS
EXL-17
< FUNCTION DIAGNOSIS >
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PARKING, LICENSE PLATE AND TAIL LAMPS
System DiagramINFOID:0000000005146628
System DescriptionINFOID:0000000005146629
PARKING, LICENSE PLATE AND TAIL LAMPS OPERATION
When the combination switch (lighting and turn signal s witch) is in 1ST position, BCM detects the LIGHTING
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 ac tivates the tail lamp relay which sends power to the parking and instru-
ment illumination circuits.
EXTERIOR LAMP BATTERY SAVER CONTROL
With the combination switch (lighting and turn signal 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 fo r 5 minutes unless the combination switch (lighting
and turn signal switch) position is changed. If the combi nation switch (lighting and turn signal switch) position
is changed, then the headlamps are turned off.
This setting can be changed by CONSULT-III. Refer to BCS-26, "
BATTERY SAVER : CONSULT-III Function
(BCM - BATTERY SAVER)".
Component Parts LocationINFOID:0000000005146630
AWLIA1753GB
1. BCM M18, M20 (view with instrument
panel removed) 2. IPDM E/R E122, E124 3. Combination switch (lighting and turn
signal switch) M28
AWNIA0509ZZ
Revision: April 20092010 QX56

POWER SUPPLY AND GROUND CIRCUITEXL-27
< COMPONENT DIAGNOSIS >
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COMPONENT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
BCM (BODY CONTROL MODULE)
BCM (BODY CONTROL MODULE) : Diagnosis ProcedureINFOID:0000000005369888
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

EXL-28
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Inspection End.
NO >> Repair or replace harness.
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
IPDM E/R (INTELLIGENT POWER DIST RIBUTION MODULE ENGINE ROOM) : Di-
agnosis Procedure
INFOID:0000000005369889
Regarding Wiring Diagram information, refer to PCS-27, "Wiring Diagram".
1. CHECK FUSES AND FUSIBLE LINK
Check that the following IPDM E/R fuses or 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 BATTERY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R.
3. Check voltage between IPDM E/R harness connectors and ground.
Is the measurement value normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
BCM
GroundContinuity
Connector Terminal
M20 67 Yes
LIIA0915E
Terminal No. Signal nameFuses and fusible link No.
1 Battery A, D
2 Battery C
12 Ignition switch ON or START 59
TerminalsIgnition switch position
(+) (−) OFF ON START
Connector Terminal
E118 (A) 1
Ground Battery
voltage Battery
voltage Battery
voltage
2 Battery
voltage Battery
voltage Battery
voltage
E119 (B) 12 0VBattery
voltage Battery
voltage
AWMIA0023ZZ
Revision: April 20092010 QX56

EXL-30
< COMPONENT DIAGNOSIS >
HEADLAMP (HI) CIRCUIT
HEADLAMP (HI) CIRCUIT
DescriptionINFOID:0000000005370270
The IPDM E/R (intelligent power distribution module engine room) controls the headlamp LH high and head-
lamp RH high relays based on inputs from the BCM via the CAN communication lines. When the headlamp LH
high and headlamp RH high relays are energized, power flows through fuse\
s 34 and 35, located in the IPDM
E/R. Power then flows to the front combination lamps to the headlamp high beam.
Component Function CheckINFOID:0000000005146640
1.CHECK HEADLAMP (HI) OPERATION
WITHOUT CONSULT-III
1. Start IPDM E/R auto active test. Refer to PCS-12, "
Diagnosis Description".
2. Check that the headlamp switches to the high beam. NOTE:
HI/LO is repeated 1 second each when usi ng the IPDM E/R auto active test.
CONSULT-III
1. Select "EXTERNAL LAMPS" of IPDM E/R active test item.
2. With the test item operating, check that the headlamp switches to high beam.
Does the headlamp switch to high beam?
YES >> Headlamp (HI) circuit is normal.
NO >> Refer to EXL-30, "
Diagnosis Procedure - Without Daytime Light System", EXL-31, "Diagnosis
Procedure - With Daytime Light System".
Diagnosis Procedure - Wit hout Daytime Light SystemINFOID:0000000005146641
Regarding Wiring Diagram information, refer to EXL-52, "Wiring Diagram".
1.CHECK HEADLAMP (HI) FUSES
1. Turn the ignition switch OFF.
2. Check that the following fuses are not open.
Is the fuse open?
YES >> Repair the harness and replace the fuse.
NO >> GO TO 2.
2.CHECK HEADLAMP (HI) OUTPUT VOLTAGE Hi : Headlamp switches to the high beam.
Off : Headlamp OFF
Unit
LocationFuse No.Capacity
Headlamp HI (LH) IPDM E/R3510A
Headlamp HI (RH) IPDM E/R3410A
Revision: April 20092010 QX56

HEADLAMP (HI) CIRCUITEXL-31
< COMPONENT DIAGNOSIS >
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1. Turn the ignition switch OFF.
2. Disconnect the front combination lamp connector E11 or E107.
3. Turn the ignition switch ON.
4. Turn the high beam headlamps ON.
5. With the high beam headlamps ON, check the voltage between the combination lamp connector and ground.
Are the voltage readings as specified?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK HEADLAMP (HI) CIRCUIT FOR OPEN
1. Turn the ignition switch OFF.
2. Disconnect IPDM E/R connector E123.
3. Check continuity between the IPDM E/R harness connector (A) and the front combination lamp harness connector (B).
Does continuity exist?
YES >> GO TO 4.
NO >> Repair the harnesses or connectors.
4.CHECK FRONT COMBINATION LAMP (HI) GROUND CIRCUIT
Check continuity between the front combination lamp harness con-
nector terminal and ground.
Does continuity exist?
YES >> Inspect the headlamp bulb.
NO >> Repair the harness.
Diagnosis Procedure - With Daytime Light SystemINFOID:0000000005146642
Regarding Wiring Diagram information, refer to EXL-56, "Wiring Diagram".
1.CHECK HEADLAMP (HI) FUSES
1. Turn the ignition switch OFF.
2. Check that the following fuses are not open.
(+) (−)Voltage
Connector Terminal
LH E11 6 Ground Battery voltage
RH E107 6
ALLIA0852ZZ
AB Continuity
Connector Terminal Connector Terminal
LH E123 55
E11 6
Ye s
RH 56E107 6
AWLIA1371ZZ
Connector Terminal —Continuity
LH E11 2
Ground Yes
RH E107 2
ALLIA0854ZZ
Revision: April 20092010 QX56

HEADLAMP (LO) CIRCUITEXL-33
< COMPONENT DIAGNOSIS >
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HEADLAMP (LO) CIRCUIT
DescriptionINFOID:0000000005146643
The IPDM E/R (intelligent power distribution modul e engine room) controls the headlamp low relay based on
inputs from the BCM via the CAN communication li nes. When the headlamp low relay is energized, power
flows through fuses 40 and 41, located in the IPDM E/R. Power then flows to the front combination lamps to
the headlamp low beam.
Component Function CheckINFOID:0000000005146644
1.CHECK HEADLAMP (LO) OPERATION
WITHOUT CONSULT-III
1. Start IPDM E/R auto active test. Refer to PCS-12, "
Diagnosis Description".
2. Check that the headlamp is turned ON. NOTE:
HI/LO is repeated 1 second each when using the IPDM E/R auto active test.
CONSULT-III
1. Select "EXTERNAL LAMPS" of IPDM E/R active test item.
2. With the test items operating, c heck that the headlamp is turned ON.
Is the headlamp turned ON?
YES >> Headlamp (LO) is normal.
NO >> Refer to EXL-33, "
Diagnosis Procedure - Without Daytime Light System", EXL-34, "Diagnosis
Procedure - With Daytime Light System".
Diagnosis Procedure - Without Daytime Light SystemINFOID:0000000005146645
Regarding Wiring Diagram information, refer to EXL-52, "Wiring Diagram".
1.CHECK HEADLAMP (LO) FUSES
1. Turn the ignition switch OFF.
2. Check that the following fuses are not open.
Is the fuse open?
YES >> Repair the harness and replace the fuse.
NO >> GO TO 2.
2.CHECK HEADLAMP (LO) OUTPUT VOLTAGE Lo : Headlamp ON
Off : Headlamp OFF
Unit
LocationFuse No.Capacity
Headlamp LO (LH) IPDM E/R4015A
Headlamp LO (RH) IPDM E/R4115A
Revision: April 20092010 QX56

EXL-34
< COMPONENT DIAGNOSIS >
HEADLAMP (LO) CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the front combination lamp connector.
3. Turn the ignition switch ON.
4. Turn the low beam headlamps ON.
5. With the low beam headlamps ON, check the voltage betweenthe combination lamp connector and ground.
Is voltage reading as specified?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK HEADLAMP (LO) CIRCUIT FOR OPEN
1. Turn the ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between the IPDM E/R harness connector and
the front combination lamp harness connector.
Does continuity exist?
YES >> GO TO 4.
NO >> Repair the harnesses or connectors.
4.CHECK FRONT COMBINATION LAMP (LO) GROUND CIRCUIT
Check continuity between the front combination lamp harness con-
nector terminal and ground.
Does continuity exist?
YES >> Inspect the headlamp bulb.
NO >> Repair the harness.
Diagnosis Procedure - With Daytime Light SystemINFOID:0000000005146646
Regarding Wiring Diagram information, refer to EXL-56, "Wiring Diagram".
1.CHECK HEADLAMP (LO) FUSES
1. Turn the ignition switch OFF.
2. Check that the following fuses are not open.
(+) (−)V olt a ge
Connector Terminal
LH E11 5
Ground Battery voltage
RH E107 5
ALLIA0855ZZ
AB
Continuity
Connector Terminal Connector Terminal
LH E123 52
E11 5
Ye s
RH 54E107 5
AWLIA1372ZZ
Connector Terminal —Continuity
LH E11 1
Ground Yes
RH E107 1
ALLIA0856ZZ
Revision: April 20092010 QX56

EXL-36
< COMPONENT DIAGNOSIS >
FRONT FOG LAMP CIRCUIT
FRONT FOG LAMP CIRCUIT
DescriptionINFOID:0000000005146647
The IPDM E/R (intelligent power distribution module engine room) controls the front fog lamp relay based on
inputs from the BCM via the CAN communication lines. When the front fog lamp relay is energized, power
flows from the front fog lamp relay in the IPDM E/R to the front fog lamps.
Component Function CheckINFOID:0000000005146648
1.CHECK FRONT FOG LAMP OPERATION
WITHOUT CONSULT-III
1. Activate IPDM E/R auto active test. Refer to PCS-12, "
Diagnosis Description".
2. Check that the front fog lamp is turned ON.
CONSULT-III
1. Select "EXTERNAL LAMPS" of IPDM E/R active test item.
2. With operating the test items, Check that the front fog lamp is turned ON.
Is the front fog lamp turned ON?
YES >> Front fog lamp circuit is normal.
NO >> Refer to EXL-36, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005146649
Regarding Wiring Diagram information, refer to EXL-73, "Wiring Diagram".
1.CHECK FRONT FOG LAMP FUSE
1. Turn the ignition switch OFF.
2. Check that the following fuses are not open.
Is the fuse open?
YES >> Repair the harness and replace the fuse.
NO >> GO TO 2.
2.CHECK FRONT FOG LAMP OUTPUT VOLTAGE
1. Turn the ignition switch OFF.
2. Disconnect the front fog/turn lamp connector.
3. Turn the ignition switch ON.
4. Turn the front fog lamps ON.
5. Check the voltage between the fog/turn lamp connector and ground.
Are the voltage readings as specified?
YES >> GO TO 4.
NO >> GO TO 3. Fog : Front fog lamp ON
Off : Front fog lamp OFF
Unit
LocationFuse No.Capacity
Front fog lamp IPDM E/R5620A
(+)
(−)V olt a g e
Connector Terminal
LH E101 1
Ground Battery voltage
RH E102 1
ALLIA0719GB
Revision: April 20092010 QX56