Ins INFINITI QX56 2004 Factory Service Manual

HEADLAMP (FOR USA)
LT-15
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Revision: August 20072004 QX56
Terminals and Reference Values for IPDM E/REKS0079V
How to Proceed With Trouble DiagnosisEKS0079W
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT- 6 , "
System Description" .
3. Perform the Preliminary Check. Refer to LT- 1 6 , "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does the headlamp 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
SKIA5292E
Terminal
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 — — —
52 L Headlamp low (LH) ONLighting switch
2ND positionOFF 0V
ON Battery voltage
54 R/Y Headlamp low (RH) ONLighting switch
2ND positionOFF 0V
ON Battery voltage
55 G Headlamp high (LH) ONLighting switch
HIGH or PASS
positionOFF 0V
ON Battery voltage
56 L/W Headlamp high (RH) ONLighting switch
HIGH or PASS
positionOFF 0V
ON Battery voltage
59 B Ground ON — 0V

LT-16
HEADLAMP (FOR USA)
Revision: August 20072004 QX56
Preliminary CheckEKS0079X
CHECK POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown fuses or fusible link.
Refer to LT- 1 0 , "
Wiring Diagram — H/LAMP —" .
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.
Unit Power source Fuse No.
BCMBattery f
Ignition switch ON or START position 59
IPDM E/R Battery34
35
40
41
53
BCM
(–)Ignition switch position
(+)
OFF ACC ON
ConnectorTe r m i n a l
(wire color)
M18 38 (W/L)
Ground0V 0VBattery
voltage
M20 70 (W/B)Battery
voltageBattery
voltageBattery
voltage
WKIA1436E

HEADLAMP (FOR USA)
LT-17
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Revision: August 20072004 QX56
3. CHECK GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
OK or NG
OK >> Inspection End.
NG >> Check ground circuit harness.
BCM
Continuity
ConnectorTe r m i n a l
(wire color)
M20 67 (B) Ground Yes
LIIA0915E

LT-18
HEADLAMP (FOR USA)
Revision: August 20072004 QX56
CONSULT-II Function (BCM)EKS0079Y
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and CON-
SULT-II CONVERTER to the data link connector, then turn igni-
tion switch ON.
2. Touch “START (NISSAN BASED VHCL)”.
3. Touch “BCM” on “SELECT SYSTEM” screen.
If “BCM” is not indicated, go to GI-39, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
BCM diagnostic
test itemDiagnostic mode Description
Inspection by partWORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the BCM
for setting the status suitable for required operation, input/output signals are
received from the BCM and received data is displayed.
DATA MONITOR Displays BCM input/output data in real time.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ECU PART NUMBER BCM part number can be read.
CONFIGURATION Performs BCM configuration read/write functions.
BBIA0369E
BCIA0029E
BCIA0030E

HEADLAMP (FOR USA)
LT-23
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Revision: August 20072004 QX56
Headlamp HI Does Not Illuminate (Both Sides)EKS007A0
1. CHECK COMBINATION SWITCH INPUT SIGNAL
Select “BCM” on CONSULT-II. With “HEAD LAMP” data monitor,
make sure “HI BEAM 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. HEADLAMP 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 “HI” on "ACTIVE TEST" screen.
4. Make sure headlamp high beam operates.
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 “HL LO REQ” and “HL HI REQ” turns ON when light-
ing switch is in HIGH 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" .
Test item CONSULT-II screen display Description
Headlamp relay (HI, LO) out-
put
EXTERNAL LAMPSAllows headlamp relay (HI, LO) to operate by switching operation
(OFF, HI, LO) at your option (Headlamp high beam repeats ON-OFF
every 1 second).
Front fog lamp relay (FOG)
outputAllows fog lamp relay (FOG) to operate by switching operation ON-
OFF at your option.
Tail lamp relay outputAllows tail lamp relay to operate by switching operation ON-OFF at
your option.
When lighting switch is in
HIGH position: HI BEAM SW ON
SKIA4193E
Headlamp high beam should operate.
WKIA1438E
When lighting switch is in
HIGH position: HL LO REQ ON
: HL HI REQ ON
SKIA5775E

LT-24
HEADLAMP (FOR USA)
Revision: August 20072004 QX56
4. CHECK HEADLAMP INPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect front combination lamp RH and LH connectors.
3. Turn ignition switch ON.
4. Select “IPDM E/R” on CONSULT-II, and select “ACTIVE TEST”
on “SELECT DIAG MODE” screen.
5. Select “EXTERNAL LAMPS” on “SELECT TEST ITEM” screen.
6. Touch “HI” on "ACTIVE TEST" screen.
7. When headlamp high beam is operating, check voltage between
front combination lamp RH and LH harness connector and
ground.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. CHECK HEADLAMP CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between IPDM E/R harness connector E123
terminal 56 (L/W) and front combination lamp RH harness con-
nector E107 terminal 6 (L/W).
4. Check continuity between IPDM E/R harness connector E123
terminal 55 (G) and front combination lamp LH harness connec-
tor E11 terminal 6 (G).
OK or NG
OK >> Replace IPDM E/R. Refer to PG-29, "Removal and Installation of IPDM E/R" .
NG >> Repair harness or connector.
6. CHECK HEADLAMP GROUND
1. Check continuity between front combination lamp RH harness
connector E107 terminal 2 (B) and ground.
2. Check continuity between front combination lamp LH harness
connector E11 terminal 2 (B) and ground.
OK or NG
OK >> Check front combination lamp connector for damage or
poor connection. Repair as necessary.
NG >> Repair harness or connector.
Front combination lamp
(–) Voltage (+)
ConnectorTe r m i n a l
(wire color)
RH E107 6 (L/W)
Ground Battery voltage
LH E11 6 (G)
WKIA1852E
56 (L/W) - 6 (L/W) : Continuity should exist.
55 (G) - 6 (G) : Continuity should exist.
WKIA1853E
2 (B) - Ground : Continuity should exist.
2 (B) - Ground : Continuity should exist.
WKIA1854E

HEADLAMP (FOR USA)
LT-25
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Revision: August 20072004 QX56
Headlamp HI Does Not Illuminate (One Side)EKS007A1
1. BULB INSPECTION
Inspect inoperative headlamp bulb.
OK or NG
OK >> GO TO 2.
NG >> Replace headlamp bulb. Refer to LT- 3 2 , "
HEADLAMP (INNER SIDE), FOR HIGH BEAM" .
2. CHECK POWER TO HEADLAMP
1. Disconnect inoperative headlamp connector.
2. Turn the high beam headlamps ON.
3. Check voltage between inoperative headlamp terminal and
ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.
3. CHECK HEADLAMP GROUND
1. Turn the high beam headlamps OFF.
2. Check continuity between inoperative headlamp connector and
ground.
OK or NG
OK >> Check headlamp connector for damage or poor connec-
tion. Repair as necessary.
NG >> Repair open circuit in harness between inoperative headlamp and ground.
Front combination lamp
(–)Vo l ta g e
(Approx.) (+)
ConnectorTe r m i n a l
(wire color)
RH E107 6 (L/W)
Ground Battery voltage
LH E11 6 (G)
WKIA1852E
Front combination lamp
Continuity
ConnectorTe r m i n a l
(wire color)
RH E107
2 (B) Ground Yes
LH E11
WKIA1854E

LT-26
HEADLAMP (FOR USA)
Revision: August 20072004 QX56
4. INSPECTION BETWEEN IPDM E/R AND HEADLAMPS
1. Disconnect IPDM E/R connector and inoperative headlamp connector.
2. Check continuity between harness connector terminals of IPDM
E/R and harness connector terminals of inoperative headlamp.
OK or NG
OK >> Replace IPDM E/R. Refer to PG-29, "Removal and
Installation of IPDM E/R" .
NG >> Check for short circuits and open circuits in harness between IPDM E/R and headlamps. Repair
as necessary.
High Beam Indicator Lamp Does Not IlluminateEKS007A2
1. BULB INSPECTION
Inspect CAN communication system. Refer to LAN-5, "
CAN COMMUNICATION" .
OK or NG
OK >> Replace combination meter. Refer to IP-13, "Combination Meter" .
NG >> Repair as necessary.
Headlamp LO Does Not Illuminate (Both Sides)EKS007A3
1. CHECK COMBINATION SWITCH INPUT SIGNAL
Select “BCM” on CONSULT-II. With “HEAD LAMP” data monitor,
make sure “HEAD LAMP SW 1” and "HEAD LAMP SW 2" 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. HEADLAMP 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 “LO” on "ACTIVE TEST" screen.
4. Make sure headlamp low beam operates.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.
IPDM E/R Front combination lamp
Continuity
ConnectorTe r m i n a l
(wire color)ConnectorTe r m i n a l
(wire color)
E12356 (L/W) RH E107 6 (L/W)
Ye s
55 (G) LH E11 6 (G)
WKIA1853E
When lighting switch is in
2ND position: HEAD LAMP SW 1 ON
: HEAD LAMP SW 2 ON
WKIA4262E
Headlamp low beam should operate.
WKIA1438E

HEADLAMP (FOR USA)
LT-27
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Revision: August 20072004 QX56
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 “HL LO REQ” turns ON when lighting switch is in
2ND 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" .
4. CHECK HEADLAMP INPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect front combination lamp RH and LH connectors.
3. Turn ignition switch ON.
4. Select “IPDM E/R” on CONSULT-II, and select “ACTIVE TEST” on “SELECT DIAG MODE” screen.
5. Select “EXTERNAL LAMPS” on “SELECT TEST ITEM” screen.
6. Touch “LO” on "ACTIVE TEST" screen.
7. When headlamp low beam is operating, check voltage between
front combination lamp RH and LH harness connector and
ground.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. CHECK HEADLAMP CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between IPDM E/R harness connector E123
terminal 54 (R/Y) and front combination lamp RH harness con-
nector E107 terminal 5 (R/Y).
4. Check continuity between IPDM E/R harness connector E123
terminal 52 (L) and front combination lamp LH harness connec-
tor E11 terminal 5 (L).
OK or NG
OK >> Replace IPDM E/R. Refer to PG-29, "Removal and Installation of IPDM E/R" .
NG >> Repair harness or connector.When lighting switch is in
2ND position: HL LO REQ ON
SKIA5780E
Front combination lamp
(–) Voltage (+)
ConnectorTe r m i n a l
(wire color)
RH E107 5 (R/Y)
Ground Battery voltage
LH E11 5 (L)
WKIA1855E
54 (R/Y) - 5 (R/Y) : Continuity should exist.
52 (L) - 5 (L) : Continuity should exist.
WKIA1856E

LT-28
HEADLAMP (FOR USA)
Revision: August 20072004 QX56
6. CHECK HEADLAMP GROUND
1. Turn ignition switch OFF.
2. Check continuity between front combination lamp RH harness
connector E107 terminal 1 (B) and ground.
3. Check continuity between front combination lamp LH harness
connector E11 terminal 1 (B) and ground.
OK or NG
OK >> Check front combination lamp connector for damage or
poor connection, ballasts (HID control unit) and xenon
bulbs. Repair as necessary.
NG >> Repair harness or connector.
Headlamp LO Does Not Illuminate (One Side)EKS007A4
1. BULB INSPECTION
Inspect ballasts (HID control unit) and xenon bulb of inoperative headlamp bulb.
OK or NG
OK >> GO TO 2.
NG >>

(step1) Replace xenon bulb with other side bulb or new one. (If lamp illuminates correctly,
replace the xenon bulb).

(step2) Replace ballast (HID control unit) with other side ballast or new one. (If lamp illuminates
correctly, replace the ballast).
2. CHECK POWER TO HEADLAMP
1. Disconnect inoperative headlamp connector.
2. Turn the low beam headlamps ON.
3. Check voltage between inoperative headlamp connector termi-
nal and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.1 (B) - Ground : Continuity should exist.
1 (B) - Ground : Continuity should exist.
WKIA1857E
Front combination lamp
(–)Vo ltag e
(Approx.) (+)
ConnectorTe r m i n a l
(wire color)
RH E107 5 (R/Y)
Ground Battery voltage
LH E11 5 (L)
WKIA1855E