Combination INFINITI QX56 2004 Factory Service Manual

LT-44
HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
Revision: August 20072004 QX56
2. CHECK PARKING BRAKE SWITCH SIGNAL
1. Disconnect parking brake switch connector.
2. Turn ignition switch ON.
3. Check voltage between parking brake switch harness connector
M11 terminal + (G) and ground.
OK or NG
OK >> Replace parking brake switch.
NG >> GO TO 3.
3. CHECK PARKING BRAKE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector.
3. Check continuity between combination meter harness connector
M24 terminal 23 (G) and parking brake switch harness connec-
tor M11 terminal + (G).
OK or NG
OK >> Replace combination meter. Refer to IP-13, "Combina-
tion Meter" .
NG >> Repair harness or connector.
CONSULT-II FunctionsEKS007AI
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).
Daytime Light Control Does Not Operate Properly (Normal Headlamps Operate
Properly)
EKS007AJ
1. CHECK DAYTIME LIGHT RELAY POWER SUPPLY CIRCUIT
1. Remove daytime light relay.
2. Check voltage between daytime light relay harness connector
E103 terminals 2 (G), 5 (G) and ground
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.+ (G) - Ground : Battery voltage should exist.
WKIA0481E
+ (G) - 23 (G) : Continuity should exist.
WKIA1445E
2 (G), 5 (G) - Ground : Battery voltage should exist.
WKIA1446E

LT-48
AUTO LIGHT SYSTEM
Revision: August 20072004 QX56
System DescriptionEKS007AP
Automatically turns on/off the parking lamps and the headlamps in accordance with ambient light.
Timing for when the lamps turn on/off can be selected using four modes.
OUTLINE
The auto light control system uses an optical sensor that detects outside brightness.
When the lighting switch is in “AUTO” position, it automatically turns on/off the parking lamps and the head-
lamps in accordance with the ambient light. Sensitivity can be adjusted in four steps. For the details of the set-
ting, refer to LT-55, "
SETTING CHANGE FUNCTIONS" .
Optical sensor ground is supplied

to optical sensor terminal 3

through BCM (body control module) terminal 18.
When ignition switch is turned to “ON” position and when outside brightness is darker than prescribed level,
input is supplied

to BCM terminal 58

through optical sensor terminal 4.
The headlamps will then illuminate. For a description of headlamp operation, refer to LT- 6 , "
System Descrip-
tion" .
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "COMBINATION SWITCH READING FUNCTION" .
EXTERIOR LAMP BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the AUTO position, and the ignition switch is turned from
ON or ACC to OFF, and one of the front doors is opened, the battery saver control feature is activated.
Under this condition, the headlamps remain illuminated for 5 minutes, then the headlamps are turned off.
Exterior lamp battery saver control mode can be changed by the function setting of CONSULT-II.
DELAY TIMER FUNCTION
When the ignition switch is ON and auto light switch is ON, the BCM turns on/off the headlamps. In delay timer
function, ignition is OFF, auto light sensor power source is OFF and the headlamps are not turned on/off by the
BCM. On condition that:

when the state of ignition switch ON or ACC is ON and output judgment by auto light function is headlamp
ON changes to ignition switch and ACC are OFF and any door switch is ON, output judgment by BCM
should be headlamp ON for 5 minutes by timer. After time out, output judgment by BCM should be head-
lamp OFF.

when the state of any door switch is turned to ON from OFF while 45 second or 5 minute timer is counting,
timer stops, and restarts counting for 5 minutes, then BCM judges output as headlamp ON. After time out,
BCM judges output as headlamp OFF.

when the state of front door switch (driver side), front door switch (passenger side), rear door switch LH,
rear door switch RH or back door latch (door ajar switch) is ON turns to all door switches are OFF while 45
second or 5 minute timer is counting, timer stops, and restarts counting for 45 seconds, then BCM judges
output as headlamp ON. After timer out, BCM judges output as headlamp OFF.

when the state is ignition switch ON or ACC is ON or auto light switch OFF while timer is counting, timer
stops counting and BCM turns on/off lamps according to headlamp function, front fog lamp function, auto
light function and headlamp battery save function.
Delay timer control mode can be changed by the function setting of CONSULT-II.
CAN Communication System DescriptionEKS007AQ
Refer to LAN-5, "CAN COMMUNICATION" .
Major Components and FunctionsEKS007AR
Components Functions
BCM

Turns on/off circuits of tail light and headlamp according to signals from light sensor, lighting switch
(AUTO), driver door switch, passenger door switch, rear door switch, and ignition switch (ON,
OFF).
Optical sensor

Converts ambient light (lux) to voltage, and sends it to BCM. (Detects lightness of 50 to 1,300 lux)

AUTO LIGHT SYSTEM
LT-53
C
D
E
F
G
H
I
J
L
MA
B
LT
Revision: August 20072004 QX56
Terminals and Reference Values for BCMEKS007AU
Te r m i n a l
No.Wire
colorSignal nameMeasuring condition
Reference value
(Approx.) Ignition
switchOperation or condition
2 SB Combination switch input 5 ONLighting, turn, wiper OFF
Wiper dial position 4
3 G/Y Combination switch input 4 ONLighting, turn, wiper OFF
Wiper dial position 4
4 Y Combination switch input 3 ONLighting, turn, wiper OFF
Wiper dial position 4
5 G/B Combination switch input 2
ONLighting, turn, wiper OFF
Wiper dial position 4
6 V Combination switch input 1
12 R/L Front door switch RH signal OFFFront door
switch RH ON (open) 0V
OFF (closed) Battery voltage
13 GR Rear door switch RH OFFRear door
switch RHON (open) 0V
OFF (closed) Battery voltage
18 P Sensor ground ON — 0V
32 R/G Combination switch output 5 ONLighting, turn, wiper OFF
Wiper dial position 4
33 R/Y Combination switch output 4 ONLighting, turn, wiper OFF
Wiper dial position 4
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E

LT-54
AUTO LIGHT SYSTEM
Revision: August 20072004 QX56
NOTE:
Optical sensor must be completely subjected to work lamp light. If the optical sensor is insufficiently illumi-
nated, the measured value may not satisfy standard.
Terminals and Reference Values for IPDM E/REKS007AV
34 L Combination switch output 3 ONLighting, turn, wiper OFF
Wiper dial position 4
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 — — —
43 R/BBack door latch (door ajar
switch) signalOFFBack door
latch (door
ajar switch)ON (open) 0V
OFF (closed) Battery voltage
47 SB Front door switch LH signal OFFFront door
switch LH ON (open) 0V
OFF (closed) Battery voltage
48 R/Y Rear door switch LH signal OFFRear door
switch LH ON (open) 0V
OFF (closed) Battery voltage
58 W/R Optical sensor signal ONWhen optical sensor is illumi-
natedLess than 3.5V
Note
When optical sensor is not illumi-
natedGreater than 3.5V
67 B Ground ON — 0V
70 W/B Battery power supply OFF — Battery voltage Te r m i n a l
No.Wire
colorSignal nameMeasuring condition
Reference value
(Approx.) Ignition
switchOperation or condition
SKIA5291E
SKIA5292E
Te r m i n a l
No.Wire color Signal 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

LT-62
AUTO LIGHT SYSTEM
Revision: August 20072004 QX56
Trouble Diagnosis Chart by SymptomEKS007B0
Lighting Switch InspectionEKS007B1
1. CHECK LIGHTING SWITCH INPUT SIGNAL
With CONSULT-II
Select “BCM” on CONSULT-II. With “HEAD LAMP” data monitor,
make sure “AUTO LIGHT SW” turns ON-OFF linked with operation
of lighting switch.
Without CONSULT-II
Refer to LT- 1 0 0 , "
Combination Switch Inspection" .
OK or NG
OK >> Inspection End.
NG >> Check lighting switch. Refer to LT-100, "
Combination
Switch Inspection" .
Headlamp relay (HI, LO) out-
put
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 outputAllows fog lamp relay to operate by switching operation ON-OFF at
your option. Test item CONSULT-II screen display Description
Trouble phenomenon Malfunction system and reference

Parking lamps and headlamps will not illuminate when out-
side of the vehicle becomes dark. (Lighting switch 1st posi-
tion and 2nd position operate normally.)

Parking lamps and headlamp will not go out when outside of
the vehicle becomes light. (Lighting switch 1st position and
2nd position operate normally.)

Headlamps go out when outside of the vehicle becomes
light, but parking lamps stay on.

Refer to LT-58, "WORK SUPPORT" .

Refer to LT-62, "Lighting Switch Inspection" .

Refer to LT-63, "Optical Sensor System Inspection" .
If above systems are normal, replace BCM. Refer to BCS-19,
"Removal and Installation of BCM" .
Parking lamps illuminate when outside of the vehicle becomes
dark, but headlamps stay off. (Lighting switch 1st position and
2nd position operate normally.)

Refer to LT-58, "WORK SUPPORT" .

Refer to LT-63, "Optical Sensor System Inspection" .
If above systems are normal, replace BCM. Refer to BCS-19,
"Removal and Installation of BCM" .
Auto light adjustment system will not operate. (Lighting switch
AUTO, 1st position and 2nd position operate normally.)

Refer to LT-63, "Optical Sensor System Inspection" .
If above system is normal, replace BCM. Refer to BCS-19, "
Removal
and Installation of BCM" .
Auto light adjustment system will not operate.

CAN communication line to BCM inspection. Refer to BCS-13,
"CAN Communication Inspection Using CONSULT-II (Self-Diagno-
sis)" .
Shut off delay feature will not operate.

CAN communication line inspection between BCM and combina-
tion meter. Refer to BCS-13, "
CAN Communication Inspection
Using CONSULT-II (Self-Diagnosis)" .

Refer to BL-31, "Door Switch Check" .
If above system is normal, replace BCM. Refer to BCS-19, "
Removal
and Installation of BCM" .
When lighting switch is in
AUTO position: AUTO LIGHT SW ON
SKIA4196E

HEADLAMP AIMING CONTROL
LT-65
C
D
E
F
G
H
I
J
L
MA
B
LT
Revision: August 20072004 QX56
HEADLAMP AIMING CONTROLPFP:26010
System DescriptionEKS007TL
The headlamp aiming system is controlled by the headlamp aiming switch.
Power is supplied at all times

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).
With the ignition switch in the ON or START position, power is supplied

through 10A fuse (No. 59, located in the fuse and relay box)

to BCM terminal 38.
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 terminal 26 of the IPDM E/R

to terminal 8 of each front combination lamp (headlamp aiming motor).
Ground is supplied

to terminal 4 of each front combination lamp (headlamp aiming motor)

through grounds E9, E15 and E24, and

to terminal 7 of each front combination lamp (headlamp aiming motor)

through headlamp aiming switch and grounds M57, M61 and M79.
With power and ground supplied, headlamp aiming motors operate according to the aiming switch position.

FRONT FOG LAMP
LT-69
C
D
E
F
G
H
I
J
L
MA
B
LT
Revision: August 20072004 QX56
FRONT FOG LAMPPFP:26150
Component Parts and Harness Connector LocationEKS007B4
System DescriptionEKS007B5
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, and

to front fog lamp relay, located in the IPDM E/R, and

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
WKIA3395E

LT-70
FRONT FOG LAMP
Revision: August 20072004 QX56

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.
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, "COMBINATION SWITCH READING FUNCTION" .
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 DescriptionEKS007B6
Refer to LAN-5, "CAN COMMUNICATION" .

FRONT FOG LAMP
LT-73
C
D
E
F
G
H
I
J
L
MA
B
LT
Revision: August 20072004 QX56
Terminals and Reference Values for BCMEKS007B8
Terminal
No.Wire
colorSignal nameMeasuring condition
Reference value
(Approx.) Ignition
switchOperation or condition
2 SB Combination switch input 5 ONLighting, turn, wiper OFF
Wiper dial position 4
3 G/Y Combination switch input 4 ONLighting, turn, wiper OFF
Wiper dial position 4
4 Y Combination switch input 3 ONLighting, turn, wiper OFF
Wiper dial position 4
5 G/B Combination switch input 2
ONLighting, turn, wiper OFF
Wiper dial position 4
6 V Combination switch input 1
32 R/G Combination switch output 5 ONLighting, turn, wiper OFF
Wiper dial position 4
33 R/Y Combination switch output 4 ONLighting, turn, wiper OFF
Wiper dial position 4
34 L Combination switch output 3 ONLighting, turn, wiper OFF
Wiper dial position 4
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E
SKIA5292E
SKIA5291E

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
SKIA5292E
Te r m i n a l
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