2010 INFINITI QX56 turn signal

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-44
< COMPONENT DIAGNOSIS >
TURN SIGNAL LAMP CIRCUIT
TURN SIGNAL LAMP CIRCUIT
DescriptionINFOID:0000000005146654
The BCM monitors inputs from the combination switch (lighting and turn signal 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 hazard warning operation. The BCM sends a turn signal indicator request to the com-
bination 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:0000000005146655
1.CHECK TURN SIGNAL LAMP
CONSULT-III
1. Select "FLASHER" of BCM (FLASHER) active test item.
2. With operating the test items, check that the turn signal lamp blinks.
Does the turn signal lamp blink?
YES >> Turn signal lamp circuit is normal.
NO >> Refer to EXL-44, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005146656
Regarding Wiring Diagram information, refer to EXL-77, "Wiring Diagram".
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 LAMP 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.LH : Turn signal lamp LH blinking
RH : Turn signal lamp RH blinking
Off : The turn signal lamp OFF
(+)
(−) Voltage
Connector Terminal
ALLIA0896ZZ
Revision: April 20092010 QX56

TURN SIGNAL LAMP CIRCUITEXL-45
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Is voltage reading as specified?
YES >> GO TO 3.
NO >> Replace BCM. Refer to BCS-59, "
Removal and Installation".
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
M20 LH 60
Ground
RH 61
PKID0926E
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
Revision: April 20092010 QX56

EXL-46
< COMPONENT DIAGNOSIS >
TURN SIGNAL LAMP 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
1. Check continuity between the front turn/fog lamp harness con- nectors and ground.
2. Check continuity between the rear combination lamp harnness connectors and ground.
3. Check continuity between the door mirrors and ground.
Are continuity test results as specified?
YES >> Replace the malfunctioning lamp.
NO >> Repair the harnesses or connectors.
Connector Terminal—Continuity
LH M20 60
Ground No
RH 61
ALLIA0404GB
ConnectorTerminal —Continuity
Front LH E101 3Gro un dY es
Front RH E102
ALLIA0721GB
Connector Terminal —Continuity
Rear LH B35 6Gro u nd Y es
Rear RH B105
WKIA4775E
Connector Terminal—Continuity
Door mirror RH D107 11Ground Yes
Door mirror LH D4
WKIA4525E
Revision: April 20092010 QX56

OPTICAL SENSOREXL-47
< COMPONENT DIAGNOSIS >
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OPTICAL SENSOR
DescriptionINFOID:0000000005146657
The optical sensor converts the outside brightness (lux) to voltage and transmits the optical sensor signal to
the BCM.
Component Function CheckINFOID:0000000005146658
1.CHECK OPTICAL SENSOR SIGNAL BY CONSULT-III
CONSULT-III
1. Turn the ignition switch ON.
2. Select "OPTICAL SENSOR" of BC M (HEAD LAMP) DATA MONITOR item.
3. Turn the lighting switch to AUTO.
4. With the optical sensor illuminat ing, 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-47, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005146659
Regarding Wiring Diagram information, refer to EXL-62, "Wiring Diagram".
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 M181 8M3023 Y es
A —Contin u it y
Connector Terminal
M18 18Ground No
AWLIA1620ZZ
Revision: April 20092010 QX56

HEADLAMP AIMING SWITCHEXL-49
< COMPONENT DIAGNOSIS >
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HEADLAMP AIMING SWITCH
DescriptionINFOID:0000000005146660
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 settings, 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 Procedure - Without Daytime Light SystemINFOID:0000000005146661
Regarding Wiring Diagram information, refer to EXL-69, "Wiring Diagram".
1.CHECK HEADLAMP AIMING SWITCH SIGNAL FOR OPEN OR SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect headlamp aiming switch connector M148 (A), headlamp aiming motor LH connector E11 and
headlamp aiming motor RH connector E107 (B).
3. Check continuity between the headlamp aiming switch connec-
tor M148 terminal 1 (A) and headlamp aiming motor LH E11 and
RH E107 terminal 7 (B).
4. Check continuity between the headlamp aiming switch connec- tor 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 resistance between the headlamp aiming switch termi- nals 1 and 2 in each switch position.
Are the resistance check results as specified?
YES >> GO TO 3.
NO >> Replace the headlamp aiming switch.
3.CHECK HEADLAMP AIMING SWITCH GROUND CIRCUIT
Connector Terminal Connector Terminal Continuity
M148 1E11
7Y es
E107
Connector Terminal —Continuity
M148 1Ground No
AWLIA1093ZZ
Component Terminal Switch Position Resistance
Headlamp
aiming switch 12 06
04 Ω
13 24 Ω
21 91 Ω
31 30 Ω
AWLIA1027ZZ
Revision: April 20092010 QX56

EXL-50
< COMPONENT DIAGNOSIS >
HEADLAMP AIMING SWITCH
1. Turn the ignition switch OFF.
2. Disconnect headlamp aiming switch connector M148.
3. Check continuity between headlamp aiming switch connectorM148 terminal 2 and ground.
Is continuity as specified?
YES >> Inspect headlamp aiming motors.
NO >> Repair harness or connector.
Diagnosis Procedure - With Daytime Light SystemINFOID:0000000005146662
Regarding Wiring Diagram information, refer to EXL-69, "Wiring Diagram".
1.CHECK HEADLAMP AIMING SWITCH SIGNAL FOR OPEN OR SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect headlamp aiming switch connector M148 (A), headlamp aiming motor LH connector E6 and headlamp aiming motor RH connector E108 (B).
3. Check continuity between the headlamp aiming switch connec-
tor M148 terminal 1 (A) and headlamp aiming motor LH E6 and
RH E108 terminal 7 (B).
4. Check continuity between the headlamp aiming switch connec- tor 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 resistance between the headlamp aiming switch termi- nals 1 and 2 in each switch position.
Are the resistance check results as specified?
YES >> GO TO 3.
NO >> Replace the headlamp aiming switch.
3.CHECK HEADLAMP AIMING SWITCH GROUND CIRCUIT
Connector Terminal —Continuity
M148 2Ground Yes
AWLIA1028ZZ
Connector Terminal Connector Terminal Continuity
M148 1E6
7Y es
E108
Connector Terminal —Continuity
M148 1Ground No
AWLIA1093ZZ
Component Terminal Switch Position Resistance
Headlamp
aiming switch 12 06
04 Ω
13 24 Ω
21 91 Ω
31 30 Ω
AWLIA1027ZZ
Revision: April 20092010 QX56