ignition INFINITI QX56 2008 Factory Service Manual

EXL-30
< COMPONENT DIAGNOSIS >
HEADLAMP (LO) CIRCUIT
HEADLAMP (LO) CIRCUIT
DescriptionINFOID:0000000001547128
The IPDM E/R (intelligent power distribution module engine room) controls the headlamp low relay based on
inputs from the BCM via the CAN communication lines. 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:0000000001547129
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 usi ng the IPDM E/R auto active test.
CONSULT-III
1. Select "EXTERNAL LAMP" of IPDM E/R active test item.
2. With the test items operating, check that the headlamp is turned ON.
Is the headlamp turned ON?
YES >> Headlamp (LO) is normal.
NO >> Refer to EXL-30, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001547130
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
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 between the combination lamp connector and ground.
Is voltage reading as specified?
YES >> GO TO 4
NO >> GO TO 3 LO : Headlamp ON
OFF : Headlamp OFF
Unit
LocationFuse No.Capacity
Headlamp LO (LH) IPDM E/R4015A
Headlamp LO (RH) IPDM E/R4115A
(+)
(−)Voltage
Connector Terminal
LH E11 5 Ground Battery voltage
RH E107 5
ALLIA0716GB
Revision: March 2010 2008 QX56

HEADLAMP (LO) CIRCUITEXL-31
< COMPONENT DIAGNOSIS >
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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.
AB Continuity
Connector Terminal Connector Terminal
LH E123 52
E11 5
Ye s
RH 54E107 5
ALLIA0717GB
Connector Terminal —Continuity
LH E11 1
Ground Yes
RH E107 1
ALLIA0718GB
Revision: March 2010 2008 QX56

EXL-32
< COMPONENT DIAGNOSIS >
FRONT FOG LAMP CIRCUIT
FRONT FOG LAMP CIRCUIT
DescriptionINFOID:0000000001547131
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:0000000001547132
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 LAMP" 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-32, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001547133
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
3.CHECK FRONT FOG LAMP OPEN CIRCUIT 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: March 2010 2008 QX56

FRONT FOG LAMP CIRCUITEXL-33
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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 fog/turn lamp harness connector.
Does continuity exist?
YES >> GO TO 4
NO >> Repair the harnesses or connectors.
4.CHECK FRONT FOG LAMP GROUND CIRCUIT
1. Disconnect the front fog lamp connector.
2. Check continuity between the front fog/turn lamp harness con- nector terminal and ground.
Does continuity exist?
YES >> Inspect the fog lamp bulb.
NO >> Repair the harness.
AB Continuity
Connector Terminal Connector Terminal
LH E123 50 E101 1
Ye s
RH 51 E102 1
ALLIA0720GB
Connector Terminal —Continuity
LH E101 3 GroundYes
RH E102 3
ALLIA0721GB
Revision: March 2010 2008 QX56

EXL-34
< COMPONENT DIAGNOSIS >
PARKING LAMP CIRCUIT
PARKING LAMP CIRCUIT
DescriptionINFOID:0000000001547134
The IPDM E/R (intelligent power distribution module engine room) controls the tail lamp relay based on inputs
from the BCM via the CAN communication lines. When the tail lamp relay is energized, power flows through
fuse 37, located in the IPDM E/R. Power then flows to the front and rear combination lamps.
Component Function CheckINFOID:0000000001547135
1.CHECK PARKING LAMP OPERATION
WITHOUT CONSULT-III
1. Activate IPDM E/R auto active test. Refer to PCS-12, "
Diagnosis Description".
2. Check that the parking lamp is turned ON.
CONSULT-III
1. Select "EXTERNAL LAMP" of IPDM E/R active test item.
2. With operating the test items, check that the parking lamp is turned ON.
Is the parking lamp turned ON?
YES >> Parking lamp circuit is normal.
NO >> Refer to EXL-34, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001547136
1.CHECK PARKING LAMP 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 TAIL LAMP RELAY OUTPUT (VOLTAGE)
1. Turn the ignition switch OFF.
2. Disconnect the front combination lamp connector, rear combination lamp connector and license plate
lamp connector.
3. Turn the ignition switch ON.
4. Turn the parking lamps ON.
5. With the parking lamps ON, check voltage between the front combination lamp connectors and ground.TAIL : Parking lamp ON
OFF : Parking lamp OFF
Unit
LocationFuse No.Capacity
Parking lamps IPDM E/R3710A
(+)
(−)Voltage
Connector Terminal
LH E11
3 Ground Battery voltage
RH E107
ALLIA0711GB
Revision: March 2010 2008 QX56

PARKING LAMP CIRCUITEXL-35
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6. With the parking lamps ON, check voltage between the rear combination lamp connectors and ground.
7. With the parking lamps ON, check voltage between the license plate lamp connector and ground
Are voltage readings as specified?
YES >> GO TO 4
NO >> GO TO 3
3.CHECK PARKING, LICENSE PLATE AND TAIL LAMP CIRCUIT (OPEN)
1. Turn the ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between the IPDM E/R harness connector (A) and the front combination lamp harness connector (B).
4. Check continuity between the IPDM E/R harness connector (A) and the rear combination lamp harness connector (B).
(+) (−)Voltage
Connector Terminal
LH B70 1 Ground Battery voltage
RH B130
ALLIA0707GB
(+) (−)V olt a g e
Connector Terminal
D703 1Ground Battery voltage
WKIA4613E
AB
Continuity
Connector Terminal Connector Terminal
LH E124 57E11
3Yes
RH E107
ALLIA0709GB
AB
Continuity
Connector Terminal Connector Terminal
LH E124 57B70
1Yes
RH B130
ALLIA0708GB
Revision: March 2010 2008 QX56

TURN SIGNAL LAMP CIRCUITEXL-37
< COMPONENT DIAGNOSIS >
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TURN SIGNAL LAMP CIRCUIT
DescriptionINFOID:0000000001547137
The BCM monitors inputs from the combination switch to determine when to activate the turn signals. The
BCM outputs voltage direction to the left and right turn signals during turn signal operation or both during haz-
ard warning operation. The BCM sends a turn signal i ndicator request to the combination meter via the CAN
communication lines.
The BCM performs the fast flasher operation (fail-safe) if any bulb or harness of the turn signal lamp circuit is
open.
NOTE:
Turn signal lamp blinks at normal speed when using the hazard warning lamp.
Component Function CheckINFOID:0000000001547138
1.CHECK TURN SIGNAL LAMP
CONSULT-III
1. Select "FLASHER" of BCM (F LASHER) active test item.
2. With operating the test items, chec k that the turn signal lamp blinks.
Does the turn signal lamp blink?
YES >> Turn signal lamp circuit is normal.
NO >> Refer to EXL-37, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001547139
1.CHECK TURN SIGNAL LAMP BULB
Check the applicable lamp bulb to be sure the proper bulb standard is in use and the bulb is not open.
Is the bulb OK?
YES >> GO TO 2
NO >> Replace the bulb.
2.CHECK TURN SIGNAL LA MP OUTPUT VOLTAGE
1. Turn the ignition switch OFF.
2. Disconnect the front turn/fog lamp connector or the rear combi- nation lamp connector.
3. Turn the ignition switch ON.
4. With turn signal switch operating, check the voltage between the BCM harness connector M20 and ground.
Is voltage reading as specified?
YES >> GO TO 3
NO >> Replace BCM. Refer to BCS-55, "
Removal and Installation".
LH : Turn signal lamp LH blinking
RH : Turn signal lamp RH blinking
OFF : The turn signal lamp OFF
(+)
(−)V olt a g e
Connector Terminal
M20 LH 60
Ground
RH 61
ALLIA0402ZZ
PKID0926E
Revision: March 2010 2008 QX56

EXL-38
< COMPONENT DIAGNOSIS >
TURN SIGNAL LAMP CIRCUIT
3.CHECK TURN SIGNAL LAMP CIRCUIT FOR OPEN
1. Turn the ignition switch OFF.
2. Disconnect BCM connector M20.
3. Check continuity between the BCM harness connector M20 and the front turn/fog lamps.
4. Check continuity between the BCM harness connector M20 and the rear combination lamp connectors.
5. Check continuity between the BCM harness connector M20 and the door mirror connectors.
Are continuity test results as specified?
YES >> GO TO 4
NO >> Repair the harnesses or connectors.
4.CHECK TURN SIGNAL LAMP SHORT CIRCUIT
Check continuity between the BCM harness connector M20 and
ground.
Does continuity exist?
YES >> Repair the harnesses or connectors.
NO >> GO TO 5
5.CHECK TURN SIGNAL LAMP GROUND CIRCUIT
AB Continuity
Connector Terminal Connector Terminal
Front LH M2060 E101
2Yes
Front RH 61 E102
ALLIA0722GB
AB
Continuity
Connector Terminal Connector Terminal
Rear LH M2060 B35 4
Ye s
Rear RH 61 B105 4
WKIA4774E
AB
Continuity
Connector Terminal Connector Terminal
Door mirror LH M2060 D4 15
Ye s
Door mirror RH 61 D107 15
WKIA4524E
ConnectorTerminal—Continuity
LH M20 60
Ground No
RH 61
ALLIA0404GB
Revision: March 2010 2008 QX56

EXL-40
< COMPONENT DIAGNOSIS >
OPTICAL SENSOR
OPTICAL SENSOR
DescriptionINFOID:0000000001547140
The optical sensor converts the outside brightness (lux) to voltage and transmits the optical sensor signal to
the BCM.
Component Function CheckINFOID:0000000001547141
1.CHECK OPTICAL SENSOR SIGNAL BY CONSULT-III
CONSULT-III
1. Turn the ignition switch ON.
2. Select "OPTICAL SENSOR" of BCM (HEAD LAMP) DATA MONITOR item.
3. Turn the lighting switch to AUTO.
4. With the optical sensor illuminating, check the monitor status.
*: Illuminates the optical sensor. The value may be less than the standard value if brightness is weak.
Is the item status normal?
YES >> Optical sensor is normal.
NO >> Refer to EXL-40, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001547142
1.CHECK OPTICAL SENSOR GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect BCM connector M18 and optical sensor connector M302.
3. Check continuity between BCM harness connector M18 (A) ter-
minal 18 and optical sensor harness connector M302 (B) termi-
nal 3.
4. Check continuity between BCM harness connector M18 (A) ter- minal 18 and ground.
Are continuity test results as specified?
YES >> GO TO 2
NO >> Repair harness or connector.
2.CHECK OPTICAL SENSOR SIGNAL CIRCUIT
Monitor item ConditionVoltage
OPTICAL SENSOR When illuminating
3.1V or more *
When shutting off light 0.6V or less
AB
Connector Terminal Connector Terminal Continuity M18 18M302 3Yes
A —Continuity
Connector Terminal
M18 18Ground No
ALLIA0406GB
Revision: March 2010 2008 QX56

EXL-42
< COMPONENT DIAGNOSIS >
HEADLAMP AIMING SWITCH
HEADLAMP AIMING SWITCH
DescriptionINFOID:0000000001806205
The manual headlamp aiming system uses a headlamp aiming switch to adjust the axis of the headlamp aim-
ing motor. The headlamp aiming switch has four sett ings, each with a different resistance value. The head-
lamp aiming motor adjusts to the proper axis based off the position of the headlamp aiming switch.
Diagnosis ProcedureINFOID:0000000001806206
1.CHECK HEADLAMP AIMING SWITCH S IGNAL FOR OPEN OR SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect headlamp aiming switch connector M148, headlamp aiming motor LH connector E11 and headlamp aiming motor RH connector E107.
3. Check continuity between the headlamp aiming switch connector M148 terminal 1 and headlamp aiming
motor LH E11 and RH E107 terminal 7.
4. Check continuity between the headlamp aimi ng switch connector M148 terminal 1 and ground.
Are the continuity test results as specified?
YES >> GO TO 2
NO >> Repair the harness or connector.
2.CHECK HEADLAMP AIMING SWITCH
1. Check continuity between the headlamp aiming switch terminals 1 and 2 in each switch position.
Are the continuity check results as specified?
YES >> GO TO 3
NO >> Replace the headlamp aiming switch.
3.CHECK HEADLAMP AIMING SWITCH GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect headlamp aiming switch connector M148.
3. Check continuity between headlamp aiming switch connector M148 terminal 2 and ground.
Is continuity as specified?
YES >> Inspect headlamp aiming motors.
NO >> Repair harness or connector.
Connector TerminalConnector TerminalContinuity
M148 1E11
7Yes
E107
Connector Terminal —Continuity
M148 1Ground No
ComponentTerminalSwitch Position Continuity
Headlamp aiming switch 12 0
604 ohms
1 324 ohms
2 191 ohms
3 130 ohms
Connector Terminal —Continuity
M148 2Ground Yes
Revision: March 2010 2008 QX56