2004 INFINITI QX56 Ins

AUTO LIGHT SYSTEM
LT-63
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Optical Sensor System InspectionEKS007B2
1. CHECK OPTICAL SENSOR INPUT SIGNAL
With CONSULT-II
Select “BCM” on CONSULT-II. With “OPTICAL SENSOR” data mon-
itor, check difference in the voltage when the optical sensor is illumi-
nated and not illuminated.
NOTE:
Optical sensor must be completely subjected to work lamp light. If
the optical sensor is insufficiently illuminated, the measured value
may not satisfy the standard.
Without CONSULT-II
GO TO 2.
OK or NG
OK >> Inspection End.
NG >> GO TO 2.
2. CHECK OPTICAL SENSOR SIGNAL GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector and optical sensor connector.
3. Check continuity (open circuit) between BCM harness connector
M18 terminal 18 (P) and optical sensor harness connector M402
terminal 3 (P).
4. Check continuity (short circuit) between BCM harness connector
M18 terminal 18 (P) and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK OPTICAL SENSOR SIGNAL CIRCUIT
1. Check continuity (open circuit) between BCM harness connector
M20 terminal 58 (W/R) and optical sensor harness connector
M402 terminal 4 (W/R).
2. Check continuity (short circuit) between BCM harness connector
M20 terminal 58 (W/R) and ground.
OK or NG
OK >> Replace optical sensor. Refer to LT-64, "Removal and
Installation of Optical Sensor" . Recheck sensor output
with CONSULT-II. If NG, replace BCM. Refer to BCS-19, "
Removal and Installation of BCM" .
NG >> Repair harness or connector.Illuminated
OPTICAL SENSOR : 3.0V or less
Not illuminated
OPTICAL SENSOR : 3.1V or more
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18 (P) - 3 (P) : Continuity should exist.
18 (P) - Ground : Continuity should not exist.
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58 (W/R) - 4 (W/R) : Continuity should exist.
58 (W/R) - Ground : Continuity should not exist.
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LT-64
AUTO LIGHT SYSTEM
Revision: August 20072004 QX56
Removal and Installation of Optical SensorEKS007B3
REMOVAL
1. Remove defrost grille. Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY" .
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.
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LT-68
HEADLAMP AIMING CONTROL
Revision: August 20072004 QX56
Removal and InstallationEKS007TM
1. Remove cluster lid A. Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY" .
2. Carefully release the headlamp aiming switch retaining pawls
and remove the switch.
Switch Circuit InspectionEKS007TN
Using a circuit tester, check continuity between the headlamp aiming
switch connector terminals in each operation status of the aiming
switch.
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Resistor tolerance : ±5%
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LT-74
FRONT FOG LAMP
Revision: August 20072004 QX56
Terminals and Reference Values for IPDM E/REKS007B9
How to Proceed With Trouble DiagnosisEKS007BA
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT-69, "
System Description" .
3. Perform the Preliminary Check. Refer to LT-75, "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does the front fog lamp operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
35 O/B Combination switch output 2
ONLighting, turn, wiper OFF
Wiper dial position 4
36 R/W Combination switch output 1
38 W/L Ignition switch (ON) ON — Battery voltage
39 W CAN-H — — —
40 R CAN-L — — —
67 B Ground ON — 0V
70 W/B Battery power supply (fusible link) OFF — Battery voltage Terminal
No.Wire
colorSignal nameMeasuring condition
Reference value
(Approx.) Ignition
switchOperation or condition
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No.Wire
colorSignal nameMeasuring condition
Reference value
(Approx.) Ignition
switchOperation or condition
38 B Ground ON — 0V
39 W CAN-H — — —
40 R CAN-L — — —
50 W/RFront turn/fog
lamp (LH)ONLighting switch must be in the 2ND position
or AUTO position (LOW beam is ON) and
the front fog lamp switch must be ONOFF 0V
ON Battery voltage
51 W/RFront turn/fog
lamp (RH) ONLighting switch must be in the 2ND position
or AUTO position (LOW beam is ON) and
the front fog lamp switch must be ONOFF 0V
ON Battery voltage
59 B Ground ON — 0V

FRONT FOG LAMP
LT-75
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Preliminary CheckEKS007BB
CHECK POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown fuses or fusible link.
Refer to LT- 7 1 , "
Wiring Diagram — F/FOG —" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of blown fuse before installing new fuse. Refer to PG-
4, "POWER SUPPLY ROUTING CIRCUIT" .
2. CHECK POWER SUPPLY CIRCUIT
1. Disconnect BCM connectors.
2. Check voltage between BCM harness connector and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open between BCM and fuse or fus-
ible link.
3. CHECK GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
OK or NG
OK >> Inspection End.
NG >> Check ground circuit harness.
Unit Power source Fuse No.
BCMBattery f
Ignition switch ON or START position 59
IPDM E/RBattery 53
Battery (Fog lamps ON) 56
BCM
(–)Ignition switch position
(+)
OFF ACC ON
ConnectorTerminal
(wire color)
M18 38 (W/L)
Ground0V 0VBattery
voltage
M20 70 (W/B)Battery
voltageBattery
voltageBattery
voltage
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BCM
Continuity
ConnectorTe r m i n a l
(wire color)
M20 67 (B) Ground Yes
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LT-76
FRONT FOG LAMP
Revision: August 20072004 QX56
CONSULT-II FunctionsEKS007BC
Refer to LT- 1 8 , "CONSULT-II Function (BCM)" in HEADLAMP (FOR USA).
Refer to LT- 2 1 , "
CONSULT-II Function (IPDM E/R)" in HEADLAMP (FOR USA).
Front Fog Lamps Do Not Illuminate (Both Sides)EKS007BD
1. 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 2.
NG >> Check lighting switch. Refer to LT-100, "
Combination
Switch Inspection" .
2. 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 3.
NG >> GO TO 4.
3. 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-29, "Removal and
Installation of IPDM E/R" .
NG >> Replace BCM. Refer to BCS-19, "
Removal and Installa-
tion of BCM" . When lighting switch is in
FOG position: FR FOG SW ON
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Fog lamps should operate.
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When lighting switch is in
FOG position: FR FOG REQ ON
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FRONT FOG LAMP
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Revision: August 20072004 QX56
4. IPDM E/R INSPECTION
Start auto active test. Refer to PG-23, "
Auto Active Test" . When
front fog lamp relay is operating, check voltage between left/right
front fog lamp connector terminals and ground.
OK or NG
OK >> Check front fog lamp bulbs and replace as necessary.
NG >> Replace IPDM E/R. Refer to PG-29, "
Removal and Installation of IPDM E/R" .
Front Fog Lamp Does Not Illuminate (One Side)EKS007BE
1. BULB INSPECTION
Inspect bulb of lamp which does not illuminate.
OK or NG
OK >> GO TO 2.
NG >> Replace front fog lamp bulb. Refer to LT- 7 9 , "
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 fog lamps.
OK or NG
OK >> Check ground circuit. If OK, replace IPDM E/R. Refer to
PG-29, "
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 fog lamps.
Front fog lamp
(–)Vo l ta g e
(Approx.) (+)
ConnectorTe r m i n a l
(wire color)
LH E101
1 (W/R) Ground Battery voltage
RH E102
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IPDM E/R Front fog lamp
Continuity
ConnectorTe r m i n a l
(wire color)ConnectorTe r m i n a l
(wire color)
E12350 (W/R) LH E101
1 (W/R) Yes
51 (W/R) RH E102
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FRONT FOG LAMP
LT-79
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Revision: August 20072004 QX56
Bulb Replacement EKS007BG
1. Remove the front turn/fog lamp assembly. Refer to LT-79, "Removal and Installation" .
2. Turn the bulb cover counterclockwise to remove it.
3. Unlatch retaining spring.
4. Remove bulb and disconnect the connector.
CAUTION:

Do not touch the glass of bulb directly by hand. Keep
grease and other oily substances away from it. Do not
touch bulb by hand while it is lit or right after being
turned off. Burning may result.

Do not leave bulb out of fog lamp reflector for a long time
because dust, moisture smoke, etc. may affect the perfor-
mance of fog lamp. When replacing bulb, be sure to
replace it with new one.
Installation is in the reverse order of removal.
Removal and InstallationEKS007BH
The fog lamp is a semi-sealed beam type which uses a replaceable halogen bulb.
CAUTION:

Do not leave fog lamp assembly without bulb for a long period of time. Dust, moisture, smoke, etc.
entering the fog lamp body may affect the performance. Remove the bulb from the headlamp
assembly just before replacement bulb is installed.

Grasp only the plastic base when handling the bulb. Never touch the glass envelope. Touching the
glass could significantly affect the bulb life and/or fog lamp performance.
1. Remove the front turn/fog lamp finisher.
2. Remove bolt and pull fog lamp out of front fascia.
3. Disconnect electrical connector.
Installation is in the reverse order of removal.
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: 5.3 Nm (0.54 kg-m, 47 in-lb)
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