light INFINITI QX56 2007 Factory Service Manual

LT-44
< SERVICE INFORMATION >
AUTO LIGHT SYSTEM
1. Check continuity (open circuit) between BCM harness connector
M20 terminal 58 and optical sensor harness connector M402
terminal 4.
2. Check continuity (short circuit) between BCM harness connector
M20 terminal 58 and ground.
OK or NG
OK >> Replace optical sensor. Refer to LT-44, "Optical Sensor"
. Recheck sensor output with CONSULT-II. If NG, replace BCM. Refer to BCS-24, "BCM" .
NG >> Repair harness or connector.
Optical SensorINFOID:0000000003533383
REMOVAL AND INSTALLATION
Removal
1. Remove defrost grille. Refer to IP-10.
2. Disconnect the connector.
3. Turn the optical sensor counterclockwise to remove it from
defroster grille.
Installation
Installation is in the reverse order of removal.58 - 4 : Continuity should exist.
58 - Ground : Continuity should not exist.
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HEADLAMP AIMING CONTROL
LT-45
< SERVICE INFORMATION >
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HEADLAMP AIMING CONTROL
System DescriptionINFOID:0000000003533384
The headlamp aiming system is controlled by the headlamp aiming switch.
Power is supplied at all times
• to ignition relay, located in the IPDM E/R (intelligent power distribution module engine room), and
• through 50A fusible link (letter f , located in the fuse and fusible link box)
• to BCM (body control module) terminal 70, and
• to headlamp low relay, located in the IPDM E/R (intelligent power distribution module engine room), and
• through 20A fuse (No. 53, located in the IPDM E/R)
• to CPU (central processing unit) of the IPDM E/R.
With the ignition switch in the ON or START position, power is supplied
• to ignition relay, located in the IPDM E/R, and
• through 10A fuse (No. 59, located in the fuse and relay box)
• to BCM terminal 38.
When the ignition switch is in the ACC or ON position, power is supplied
• through 10A fuse [No. 4, located in the fuse block (J/B)]
• to BCM terminal 11.
When the lighting switch is in the 2ND position or AUTO position (auto lights ON), the headlamp low relay
(located in the IPDM E/R) is energized. When energized, power is supplied
• through 15A fuse (No. 41, located in the IPDM E/R)
• through IPDM E/R terminal 26
• to front combination lamp LH and RH (headlamp aiming motor) terminal 8.
Ground is supplied
• to front combination lamp LH and RH (headlamp aiming motor) terminal 4
• through grounds E9, E15 and E24, and
• to front combination lamp LH and RH (headlamp aiming motor) terminal 7
• through headlamp aiming switch terminal 1
• through headlamp aiming switch terminal 2
• through grounds M57, M61 and M79.
With power and ground supplied, headlamp aiming motors operate according to the aiming switch position.

FRONT FOG LAMP
LT-49
< SERVICE INFORMATION >
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FRONT FOG LAMP
Component Parts and Harness Connector LocationINFOID:0000000003533388
System DescriptionINFOID:0000000003533389
Control of the fog lamps is dependent upon the position of the combination switch (lighting switch). The light-
ing switch must be in the 2ND position or AUTO position (LOW beam is ON) for front fog lamp operation.
When the lighting switch is placed in the fog lamp position, the BCM (body control module) receives input sig-
nal requesting the fog lamps to illuminate. When the headlamps are illuminated, this input signal is communi-
cated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication
lines. The CPU (central processing unit) of the IPDM E/R controls the front fog lamp relay coil. When acti-
vated, this relay directs power to the front fog lamps.
OUTLINE
Power is supplied at all times
• to ignition relay, located in the IPDM E/R,
• to front fog lamp relay, located in the IPDM E/R,
• through 20A fuse (No. 53, located in the IPDM E/R)
• to CPU of the IPDM E/R, and
• through 50A fusible link (letter f , located in the fuse and fusible link box)
• to BCM terminal 70.
When the ignition switch is in ON or START position, power is supplied
• to ignition relay, located in the IPDM E/R, and
• through 10A fuse (No. 59, located in the fuse and relay box)
• to BCM terminal 38.
Ground is supplied
• to BCM terminal 67
• through grounds M57, M61 and M79, and
• to IPDM E/R terminals 38 and 59
• through grounds E9, E15 and E24.
FOG LAMP OPERATION
The fog lamp switch is built into the combination switch. The lighting switch must be in the 2ND position or
AUTO position (LOW beam is ON) and the fog lamp switch must be ON for fog lamp operation.
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LT-50
< SERVICE INFORMATION >
FRONT FOG LAMP
With the fog lamp switch in the ON position, the CPU of the IPDM E/R grounds the coil side of the fog lamp
relay. The fog lamp relay then directs power
• through 20A fuse (No. 56, located in the IPDM E/R)
• through IPDM E/R terminal 50
• to front turn/fog lamp LH terminal 1, and
• through IPDM E/R terminal 51
• to front turn/fog lamp RH terminal 1.
Ground is supplied
• to front turn/fog lamp LH and RH terminal 3
• through grounds E9, E15 and E24.
With power and ground supplied, the front fog lamps illuminate.
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "System Description" .
EXTERIOR LAMP BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the 2ND position (ON), the fog lamp switch is ON, and the
ignition switch is turned from ON or ACC to OFF, the battery saver control feature is activated.
Under this condition, the fog lamps (and headlamps) remain illuminated for 5 minutes, then the fog lamps (and
headlamps) are turned off.
Exterior lamp battery saver control mode can be changed by the function setting of CONSULT-II.
CAN Communication System DescriptionINFOID:0000000003533390
Refer to LAN-4, "CAN Communication System" .

FRONT FOG LAMP
LT-53
< SERVICE INFORMATION >
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How to Proceed with Trouble DiagnosisINFOID:0000000003533394
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT-49, "
System Description" .
3. Perform the Preliminary Check. Refer toLT-53, "
Preliminary Check" .
4. Check symptom and repair or replace the component.
5. Does the front fog lamp operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckINFOID:0000000003533395
CHECK POWER SUPPLY AND GROUND CIRCUIT FOR BCM
Refer to BCS-15, "BCM Power Supply and Ground Circuit Inspection" .
CHECK POWER SUPPLY AND GROUND CIRCUIT FOR IPDM E/R
Refer to PG-26, "IPDM E/R Power/Ground Circuit Inspection" .
CONSULT-II Function for BCMINFOID:0000000003533396
Refer to BCS-16, "CONSULT-II Function (BCM)" .
CONSULT-II Function for IPDM E/RINFOID:0000000003533397
Refer to PG-18, "CONSULT-II Function (IPDM E/R)" .
Front Fog Lamps Do Not Illuminate (Both Sides)INFOID:0000000003533398
1.CHECK FUSE
Inspect 20A fuse (No. 56, located in the IPDM E/R).
OK or NG
OK >> GO TO 2.
NG >> Repair harness.
2.CHECK COMBINATION SWITCH INPUT SIGNAL
Select "BCM" on CONSULT-II. With "HEAD LAMP" data monitor,
make sure "FR FOG SW" turns ON-OFF linked with operation of
lighting switch.
OK or NG
OK >> GO TO 3.
NG >> Check lighting switch. Refer to LT-73, "
Combination
Switch Inspection".
3.FOG LAMP ACTIVE TEST
1. Select "IPDM E/R" on CONSULT-II, and select "ACTIVE TEST"
on "SELECT DIAG MODE" screen.
2. Select "EXTERNAL LAMPS" on "SELECT TEST ITEM" screen.
3. Touch "FOG" on "ACTIVE TEST" screen.
4. Make sure fog lamps operate.
OK or NG
OK >> GO TO 4.
NG >> GO TO 5.When lighting switch is in
FOG position: FR FOG SW ON
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Fog lamps should operate.
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LT-54
< SERVICE INFORMATION >
FRONT FOG LAMP
4.CHECK IPDM E/R
1. Select "IPDM E/R" on CONSULT-II, and select "DATA MONI-
TOR" on "SELECT DIAG MODE" screen.
2. Make sure "FR FOG REQ" turns ON when lighting switch is in
FOG position.
OK or NG
OK >> Replace IPDM E/R. Refer to PG-28, "Removal and
Installation of IPDM E/R".
NG >> Replace BCM. Refer to BCS-24, "
BCM".
5.IPDM E/R INSPECTION
1. Disconnect front turn/fog lamp connectors
2. Start auto active test. Refer to PG-20, "
Auto Active Test". When
front fog lamp relay is operating, check voltage between left/right
front turn/fog lamp connector terminal and ground.
OK or NG
OK >> Check front fog lamp bulbs and replace as necessary.
NG >> Replace IPDM E/R. Refer to PG-28, "
Removal and Installation of IPDM E/R".
Front Fog Lamp Does Not Illuminate (One Side)INFOID:0000000003533399
1.BULB INSPECTION
Inspect bulbs of lamps which do not illuminate.
OK or NG
OK >> GO TO 2.
NG >> Replace lamp bulb. Refer to LT-55, "
Bulb Replacement".
2.INSPECTION BETWEEN IPDM E/R AND FRONT FOG LAMPS
1. Disconnect IPDM E/R connector and inoperative front fog lamp connector.
2. Check continuity between harness connector terminals of IPDM
E/R and harness connector terminal of front turn/fog lamps.
OK or NG
OK >> Check ground circuit. If OK, replace IPDM E/R. Refer to
PG-28, "
Removal and Installation of IPDM E/R". If NG,
repair harness or connector.
NG >> Check for short circuits and open circuits in harness between IPDM E/R and front turn/fog lamps. When lighting switch is in
FOG position: FR FOG REQ ON
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Front turn/fog lamp (+)
(–)Vo l ta g e
(Approx.) Connec-
torTe r m i n a l
LH E101 1
Ground Battery voltage
RH E102 1
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IPDM E/R Front turn/fog lamp Continuity
Connector Terminal Connector Terminal
E12350 LH E101 1
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51 RH E102 1
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LT-64
< SERVICE INFORMATION >
TURN SIGNAL AND HAZARD WARNING LAMPS
3. Perform preliminary check. Refer to LT-64, "Preliminary Check" .
4. Check symptom and repair or replace the component.
5. Do turn signal and hazard warning lamps operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckINFOID:0000000003533410
CHECK POWER SUPPLY AND GROUND CIRCUIT FOR BCM
Refer to BCS-15, "BCM Power Supply and Ground Circuit Inspection".
CONSULT-II Function (BCM)INFOID:0000000003533411
Refer to BCS-16, "CONSULT-II Function (BCM)".
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure".
DATA MONITOR
Display Item List
ACTIVE TEST
Display Item List
Front Turn Signal Lamp Does Not OperateINFOID:0000000003533412
1.CHECK COMBINATION SWITCH INPUT SIGNAL
With CONSULT-II
Select "BCM" on CONSULT-II. With "FLASHER" data monitor, make
sure "TURN SIGNAL R" and "TURN SIGNAL L" turns ON-OFF
linked with operation of lighting switch.
Without CONSULT-II
Refer to LT-73, "
Combination Switch Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Check lighting switch. Refer to LT-73, "
Combination Switch Inspection".
2.ACTIVE TEST
With CONSULT-II
Monitor item Contents
IGN ON SW "ON/OFF" Displays "IGN position (ON)/OFF, ACC position (OFF)" judged from the ignition switch signal.
HAZARD SW "ON/OFF" Displays "Hazard ON (ON)/Hazard OFF (OFF)" status, determined from hazard switch signal.
TURN SIGNAL R "ON/OFF" Displays "Turn right (ON)/Other (OFF)" status, determined from lighting switch signal.
TURN SIGNAL L "ON/OFF" Displays "Turn left (ON)/Other (OFF)" status, determined from lighting switch signal.
BRAKE SW "ON/OFF" Displays status of stop lamp switch.
Test item Description
FLASHER (RH) Turn signal lamp (right) can be operated by any ON-OFF operations.
FLASHER (LH) Turn signal lamp (left) can be operated by any ON-OFF operations.
When lighting switch is in
TURN RH position: TURN SIGNAL R ON
When lighting switch is in
TURN LH position: TURN SIGNAL L ON
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LT-66
< SERVICE INFORMATION >
TURN SIGNAL AND HAZARD WARNING LAMPS
Select "BCM" on CONSULT-II. With "FLASHER" data monitor, make
sure "TURN SIGNAL R" and "TURN SIGNAL L" turns ON-OFF
linked with operation of lighting switch.
Without CONSULT-II
Refer to LT-73, "
Combination Switch Inspection".
OK or NG
OK >> GO TO 2.
NG >> Check lighting switch. Refer to LT-73, "
Combination Switch Inspection".
2.ACTIVE TEST
With CONSULT-II
1. Select "FLASHER" during active test. Refer to LT-64, "
CON-
SULT-II Function (BCM)".
2. Make sure "FLASHER RH" and "FLASHER LH" operate.
Without CONSULT-II
GO TO 3.
OK or NG
OK >> Replace BCM. Refer to BCS-24, "BCM".
NG >> GO TO 3.
3.CHECK TURN SIGNAL LAMPS CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector and door mirror LH/RH connector.
3. Check continuity between BCM harness connector M20 (A) ter-
minal 60 (LH), 61 (RH) and door mirror harness connector (LH
D4), (RH D107) (B) terminal 15.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4.CHECK GROUND
1. Check continuity between door mirror harness connector (LH
D4), (RH D107) terminal 11 and ground.
OK or NG
OK >> Replace door mirror turn signal.
NG >> Repair harness or connector.
Rear Turn Signal Lamp Does Not OperateINFOID:0000000003533414
1.CHECK BULB
Check bulb standard of each turn signal lamp is correct. Refer to LT-138, "
Exterior Lamp" . When lighting switch is in
TURN RH position: TURN SIGNAL R ON
When lighting switch is in
TURN LH position: TURN SIGNAL L ON
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60, 61 - 15 : Continuity should exist.
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11 - Ground : Continuity should exist.
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LT-70
< SERVICE INFORMATION >
LIGHTING AND TURN SIGNAL SWITCH
LIGHTING AND TURN SIGNAL SWITCH
Removal and InstallationINFOID:0000000003533419
Removal
1. Remove steering column cover.
2. While pressing tabs, pull lighting and turn signal switch toward
driver door and disconnect from the base.
Installation
Installation is in the reverse order of removal.
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COMBINATION SWITCH
LT-73
< SERVICE INFORMATION >
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CONSULT-II Function (BCM)INFOID:0000000003533423
Refer to BCS-16, "CONSULT-II Function (BCM)" .
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure" .
DATA MONITOR
Display Item List
Combination Switch InspectionINFOID:0000000003533424
1.SYSTEM CHECK
1. Referring to table below, check which system the malfunctioning switch belongs.
>> GO TO 2.
2.SYSTEM CHECK
With CONSULT-II
CAUTION:
Monitor item name
"OPERATION OR UNIT"Contents
TURN SIGNAL R "ON/OFF" Displays "Turn Right (ON)/Other (OFF)" status, determined from lighting switch signal.
TURN SIGNAL L "ON/OFF" Displays "Turn Left (ON)/Other (OFF)" status, determined from lighting switch signal.
HI BEAM SW "ON/OFF"Displays status (high beam switch: ON/Others: OFF) of high beam switch judged from lighting switch
signal.
HEAD LAMP SW 1 "ON/OFF" Displays "Headlamp switch 1 (ON)/Other (OFF)" status, determined from lighting switch signal.
HEAD LAMP SW 2 "ON/OFF"Displays status (headlamp switch 2: ON/Others: OFF) of headlamp switch 2 judged from lighting
switch signal.
LIGHT SW 1ST "ON/OFF"Displays status (lighting switch 1st position: ON/Others: OFF) of lighting switch judged from lighting
switch signal.
PASSING SW "ON/OFF"Displays status (flash-to-pass switch: ON/Others: OFF) of flash-to-pass switch judged from lighting
switch signal.
AUTO LIGHT SW "ON/OFF" Displays "Auto light switch (ON)/Other (OFF)" status, determined from lighting switch signal.
FR FOG SW "ON/OFF" Displays "Front fog lamp switch (ON)/Other (OFF)" status, determined from lighting switch signal.
FR WIPER HI "ON/OFF" Displays "Front Wiper HI (ON)/Other (OFF)" status, determined from wiper switch signal.
FR WIPER LOW "ON/OFF" Displays "Front Wiper LOW (ON)/Other (OFF)" status, determined from wiper switch signal.
FR WIPER INT "ON/OFF" Displays "Front Wiper INT (ON)/Other (OFF)" status, determined from wiper switch signal.
FR WASHER SW "ON/OFF" Displays "Front Washer Switch (ON)/Other (OFF)" status, determined from wiper switch signal.
INT VOLUME [1 - 7] Displays intermittent operation knob setting (1 - 7), determined from wiper switch signal.
RR WIPER ON "ON/OFF" Displays "Rear Wiper (ON)/(OFF)" status, determined from wiper switch signal.
RR WIPER INT "ON/OFF" Displays "Rear Wiper INT (ON)/(OFF)" status, determined from wiper switch signal.
RR WASHER SW "ON/OFF" Displays "Rear Washer (ON)/(OFF)" status, determined from wiper switch signal.
System 1 System 2 System 3 System 4 System 5
— FR WASHER FR WIPER LO TURN LH TURN RH
FR WIPER HI — FR WIPER INT PASSING HEAD LAMP1
INT VOLUME 1 RR WASHER — HEAD LAMP2 HI BEAM
RR WIPER INT INT VOLUME 3 AUTO LIGHT — TAIL LAMP
INT VOLUME 2 RR WIPER ON — FR FOG —