Content .. 4 5 6 7 ..

Infiniti QX4. Electrical System (2003 year). Instruction - part 6

System Description

NBEL0280

OUTLINE

NBEL0280S01

Power is supplied at all times

쐌

to headlamp RH relay terminals 1 and 3

쐌

through 15A fuse (No. 59, located in the fuse and fusible link box), and

쐌

to smart entrance control unit terminal 49

쐌

through 7.5A fuse [No. 24, located in the fuse block (J/B)], and

쐌

to front fog lamp relay terminal 3

쐌

through 15A fuse (No. 53, located in the fuse and fusible link box).

When ignition switch is in ON or START position, power is supplied

쐌

to smart entrance control unit terminal 27

쐌

through 7.5A fuse [No. 11, located in the fuse block (J/B)].

When the ignition switch is in the ACC or ON position, power is supplied

쐌

to smart entrance control unit terminal 26

쐌

through 10A fuse [No. 10, located in the fuse block (J/B)].

Ground is supplied

쐌

to smart entrance control unit terminals 43 and 64

쐌

through body grounds M77 and M111.

When lighting switch is in 2ND position, ground is supplied

쐌

to headlamp RH relay terminal 2 from smart entrance control unit terminals 21 and 59.

쐌

through smart entrance control unit terminals 22 and 60,

쐌

through lighting switch terminal 12, and

쐌

through body grounds E13 and E41.

Headlamp RH relay is then energized.

FOG LAMP OPERATION

NBEL0280S02

The front fog lamp switch is built into the combination switch. The lighting switch must be in the 2ND position
and LOW (“B”) position for front fog lamp operation.
With the front fog lamp switch in the ON position, ground is supplied

쐌

to front fog lamp relay terminal 1

쐌

through the front fog lamp switch, lighting switch and body grounds E13 and E41.

The front fog lamp relay is energized and power is supplied

쐌

from front fog lamp relay terminal 5

쐌

to terminal 1 of each front fog lamp.

Ground is supplied to terminal 3 of each front fog lamp through body grounds E13 and E41.
With power and ground supplied, the front fog lamps illuminate.

EXTERIOR LAMP BATTERY SAVER CONTROL

NBEL0280S03

Front fog lamps will remain on for a short while after the ignition switch is turned from ON (or ACC) to OFF.
Continuity between terminals 21 and 22, and between terminals 59 and 60 of smart entrance control unit will
be disturbed after 5 minutes, then the front fog lamps will be turned off.
When the lighting switch is turned from OFF to 2ND after front fog lamps are turned off by the exterior lamp
battery saver control, ground is supplied

쐌

to smart entrance control unit terminals 20 and 58 from lighting switch terminal 11, and then

쐌

to headlamp RH relay terminal 2 from smart entrance control unit terminals 21 and 59

쐌

through smart entrance control unit terminals 22 and 60 from lighting switch terminal 12.

Then the front fog lamps illuminate again.
NOTE:
For Trouble Diagnoses for exterior lamp battery saver control, refer to “HEADLAMP (FOR USA) —
XENON TYPE —”, EL-45.

IDX

FRONT FOG LAMP

System Description

EL-85

Wiring Diagram — F/FOG —

NBEL0281

MEL527O

FRONT FOG LAMP

Wiring Diagram — F/FOG —

EL-86

MEL296Q

IDX

FRONT FOG LAMP

Wiring Diagram — F/FOG — (Cont’d)

EL-87

SEL350X

Aiming Adjustment

NBEL0282

Before performing aiming adjustment, make sure of the following.
1)

Keep all tires inflated to correct pressure.

Place vehicle on level ground.

See that vehicle is unloaded (except for full levels of coolant,
engine oil and fuel, and spare tire, jack, and tools). Have the
driver or equivalent weight placed in driver’s seat.

Adjust aiming in the vertical direction by turning the adjusting
screw.

MEL327G

Set the distance between the screen and the center of the fog
lamp lens as shown at left.

Turn front fog lamps ON.

MEL328GA

Adjust front fog lamps so that the top edge of the high inten-
sity zone is 200 mm (7.9 in) below the height of the fog lamp
centers as shown at left.

쐌

When performing adjustment, if necessary, cover the head-
lamps and opposite fog lamp.

FRONT FOG LAMP

Aiming Adjustment

EL-88

System Description

NBEL0283

TURN SIGNAL OPERATION

NBEL0283S01

With the hazard switch in the OFF position and the ignition switch in the ON or START position, power is sup-
plied

쐌

through 7.5A fuse [No. 12, located in the fuse block (J/B)]

쐌

to hazard switch terminal 2

쐌

through terminal 1 of the hazard switch

쐌

to combination flasher unit terminal 1

쐌

through terminal 3 of the combination flasher unit

쐌

to turn signal switch terminal 1.

Ground is supplied to combination flasher unit terminal 2 through body grounds M4, M66 and M147.

LH Turn

NBEL0283S0101

When the turn signal switch is moved to the LH position, power is supplied from turn signal switch terminal 3
to

쐌

front turn signal lamp LH terminal 2

쐌

combination meter terminal 25

쐌

rear combination lamp LH terminal 5.

Ground is supplied to the front turn signal lamp LH terminal 3 through body grounds E13 and E41.
Ground is supplied to the rear combination lamp LH terminal 6 through body grounds B11, B22 and D210.
Ground is supplied to combination meter terminal 30 through body grounds M4, M66 and M147.
With power and ground supplied, the combination flasher unit controls the flashing of the LH turn signal lamps.

RH Turn

NBEL0283S0102

When the turn signal switch is moved to the RH position, power is supplied from turn signal switch terminal
2 to

쐌

front turn signal lamp RH terminal 2

쐌

combination meter terminal 29

쐌

rear combination lamp RH terminal 5.

Ground is supplied to the front turn signal lamp RH terminal 3 through body grounds E13 and E41.
Ground is supplied to the rear combination lamp RH terminal 6 through body grounds B55 and B75.
Ground is supplied to combination meter terminal 30 through body grounds M4, M66 and M147.
With power and ground supplied, the combination flasher unit controls the flashing of the RH turn signal lamps.

HAZARD LAMP OPERATION

NBEL0283S02

Power is supplied at all times to hazard switch terminal 3 through:

쐌

15A fuse [No. 20, located in the fuse block (J/B)].

With the hazard switch in the ON position, power is supplied

쐌

through terminal 1 of the hazard switch

쐌

to combination flasher unit terminal 1

쐌

through terminal 3 of the combination flasher unit

쐌

to hazard switch terminal 4.

Ground is supplied to combination flasher unit terminal 2 through body grounds M4, M66 and M147.
Power is supplied through terminal 5 of the hazard switch to

쐌

front turn signal lamp LH terminal 2

쐌

combination meter terminal 25

쐌

rear combination lamp LH terminal 5.

Power is supplied through terminal 6 of the hazard switch to

쐌

front turn signal lamp RH terminal 2

쐌

combination meter terminal 29

쐌

rear combination lamp RH terminal 5.

IDX

TURN SIGNAL AND HAZARD WARNING LAMPS

System Description

EL-89

Ground is supplied to terminal 3 of each front turn signal lamp through body grounds E13 and E41.
Ground is supplied to terminal 6 of the rear combination lamp LH through body grounds B11, B22 and D210.
Ground is supplied to terminal 6 of the rear combination lamp RH through body grounds B55 and B75.
Ground is supplied to combination meter terminal 30 through body grounds M4, M66 and M147.
With power and ground supplied, the combination flasher unit controls the flashing of the hazard warning
lamps.

REMOTE KEYLESS ENTRY SYSTEM OPERATION

NBEL0283S03

Power is supplied at all times

쐌

to smart entrance control unit terminal 49

쐌

through 7.5A fuse [No. 24, located in the fuse block (J/B)].

Ground is supplied to smart entrance control unit terminal 43 and 64.
When smart entrance control unit receives LOCK or UNLOCK signal from keyfob with all doors closed (Refer
to “REMOTE KEYLESS ENTRY SYSTEM”, EL-423.), power is supplied

쐌

through terminal 47 of smart entrance control unit

쐌

to front turn signal lamp LH terminal 2

쐌

to combination meter terminal 25

쐌

to rear combination lamp LH terminal 5, and

쐌

through terminal 48 of smart entrance control unit

쐌

to front turn signal lamp RH terminal 2

쐌

to combination meter terminal 29

쐌

to rear combination lamp RH terminal 5.

Ground is supplied to terminal 3 of each front turn signal lamp through body grounds E13 and E41.
Ground is supplied to terminal 6 of the rear combination lamp LH through body grounds B11, B22 and D210.
Ground is supplied to terminal 6 of the rear combination lamp RH through body grounds B55 and B75.
Ground is supplied to combination meter terminal 30 through body grounds M4, M66 and M147.
With power and ground supplied, the smart entrance control unit controls the flashing of the hazard warning
lamps.

TURN SIGNAL AND HAZARD WARNING LAMPS

System Description (Cont’d)

EL-90

Wiring Diagram — TURN —

NBEL0284

MEL297Q

IDX

TURN SIGNAL AND HAZARD WARNING LAMPS

Wiring Diagram — TURN —

EL-91

MEL707N

TURN SIGNAL AND HAZARD WARNING LAMPS

Wiring Diagram — TURN — (Cont’d)

EL-92

Trouble Diagnoses

NBEL0285

Symptom

Possible cause

Repair order

Turn signal and hazard warning
lamps do not operate.

1. Hazard switch
2. Combination flasher unit
3. Open in combination flasher

unit circuit

1. Check hazard switch.
2. Refer to combination flasher unit check.
3. Check wiring to combination flasher unit for open

circuit.

Turn signal lamps do not operate
but hazard warning lamps operate.

1. 7.5A fuse
2. Hazard switch
3. Combination switch (turn signal)
4. Open in combination switch

(turn signal) circuit

1. Check 7.5A fuse [No. 12, located in fuse block

(J/B)]. Turn ignition switch ON and verify battery
positive voltage is present at terminal 2 of hazard
switch.

2. Check hazard switch.
3. Check combination switch (turn signal).
4. Check the wire between combination flasher unit

terminal 3 and combination switch (turn signal) ter-
minal 1 for open circuit.

Hazard warning lamps do not oper-
ate but turn signal lamps operate.

1. 15A fuse
2. Hazard switch
3. Open in hazard switch circuit

1. Check 15A fuse [No. 20, located in fuse block (J/B)].

Verify battery positive voltage is present at terminal
3 of hazard switch.

2. Check hazard switch.
3. Check the wire between combination flasher unit

terminal 3 and hazard switch terminal 4 for open cir-
cuit.

Front turn signal lamp LH or RH
does not operate.

1. Bulb
2. Grounds E13 and E41
3. Open in front turn signal lamp

circuit

1. Check bulb.
2. Check grounds E13 and E41.
3. Check harness between front turn signal lamp and

combination switch.

Rear combination lamp LH does
not operate.

1. Bulb
2. Grounds B11, B22 and D210
3. Open in rear combination lamp

LH circuit

1. Check bulb.
2. Check grounds B11, B22 and D210.
3. Check harness between rear combination lamp LH

and hazard switch.

Rear combination lamp RH does
not operate.

1. Bulb
2. Grounds B55 and B75
3. Open in rear combination lamp

RH circuit

1. Check bulb.
2. Check grounds B55 and B75.
3. Check harness between rear combination lamp RH

and hazard switch.

LH and RH turn indicators do not
operate.

1. Ground

1. Check grounds M4, M66 and M147.

LH or RH turn indicator does not
operate.

1. Bulb
2. Open in turn indicator circuit

1. Check bulb in combination meter.
2. Check harness between combination meter and haz-

ard switch.

SEL122E

Electrical Components Inspection

NBEL0286

COMBINATION FLASHER UNIT CHECK

NBEL0286S01

쐌

Before checking, ensure that bulbs meet specifications.

쐌

Connect a battery and test lamp to the combination flasher
unit, as shown. Combination flasher unit is properly function-
ing if it blinks when power is supplied to the circuit.

IDX

TURN SIGNAL AND HAZARD WARNING LAMPS

Trouble Diagnoses

EL-93

System Description

NBEL0287

The illumination lamp operation is controlled by the lighting switch which is built into the combination switch
and smart entrance control unit. The battery saver system is controlled by smart entrance control unit.
Power is supplied at all times

쐌

to tail lamp relay terminals 1 and 3

쐌

through 10A fuse (No. 61, located in the fuse and fusible link box), and

쐌

to smart entrance control unit terminal 49

쐌

through 7.5A fuse [No. 24, located in the fuse block (J/B)].

When ignition switch is in ON or START position, power is supplied

쐌

to smart entrance control unit terminal 27

쐌

through 7.5A fuse [No. 11, located in the fuse block (J/B)].

When the ignition switch is in ACC or ON position, power is supplied

쐌

to smart entrance control unit terminal 26

쐌

through 10A fuse [No. 10, located in the fuse block (J/B)].

Ground is supplied

쐌

to smart entrance control unit terminals 43 and 64

쐌

through body grounds M77 and M111.

LIGHTING OPERATION BY LIGHTING SWITCH

NBEL0287S01

When lighting switch is 1ST (or 2ND) position, ground is supplied

쐌

to tail lamp relay terminal 2 from smart entrance control unit terminals 19 and 57

쐌

through smart entrance control unit terminals 20 and 58, and

쐌

through lighting switch and body grounds E13 and E41.

Tail lamp relay is then energized and illumination lamps illuminate.
The lighting switch must be in the 1ST or 2ND position for illumination.
The illumination control switch that controls the amount of current to the illumination system. As the amount
of current increases, the illumination becomes brighter.
The ground for all of the components except for grove box lamp, ashtray and compass and thermometer are
controlled through terminals 2 and 3 of the illumination control switch and body grounds M77 and M111.

LIGHTING OPERATION BY AUTO LIGHT CONTROL SYSTEM

NBEL0287S02

When auto light operation is operated, ground is supplied

쐌

to tail lamp relay terminal 2 from smart entrance control unit terminals 19 and 57

쐌

through smart entrance control unit terminals 43 and 64, and

쐌

to body grounds M77 and M111.

Tail lamp relay is then energized and the illumination lamps illuminate.
The illumination control switch that controls the amount of current to the illumination system. As the amount
of current increases, the illumination becomes brighter.
The following chart shows the power and ground connector terminals for the components included in the illu-
mination system.

Component

Connector No.

Power terminal

Ground terminal

Illumination control switch

M19

4WD shift switch

M141

Ashtray

M54

A/T device

B59

Cigarette lighter

M57

Audio unit

M48

Compass and thermometer

Hazard switch

M35

Rear window defogger switch

M36

ILLUMINATION

System Description

EL-94

Component

Connector No.

Power terminal

Ground terminal

Headlamp aiming switch

M16

Display and NAVI control unit

M117, M118

A/C auto amp.

M102

Clock

M39

Globe box lamp

M30

The ground for all of the components except for compass and thermometer, glove box lamp and ashtray are
controlled through terminals 2 and 3 of the illumination control switch and body grounds M77 and M111.

EXTERIOR LAMP BATTERY SAVER CONTROL

NBEL0287S03

Except for Auto Light Control Operation

NBEL0287S0301

Illumination lamps will remain on for a short while after the ignition switch is turned from ON (or ACC) to OFF.
Continuity between terminals 19 and 20, and between terminals 57 and 58 of smart entrance control unit will
be disturbed after 5 minutes, then the illumination lamp will be turned off.
When the lighting switch is turned from OFF to 1ST (or 2ND) after illumination lamps are turned off by the
battery saver control, ground is supplied

쐌

to smart entrance control unit terminals 20 and 58 from lighting switch terminal 11, and

쐌

to tail lamp relay terminal 2 from smart entrance control unit terminals 19 and 57.

Then illumination lamps illuminate again.

Auto light control operation

NBEL0287S0302

While the illumination lamps are turned ON by “AUTO” operation, the exterior lamp battery saver is activated
for 5 minutes when the ignition switch is turned from ON (or ACC) to OFF, and either LH or RH front door
switch is opened.
The smart entrance control unit controls exterior lamp battery saver activation as follows:

쐌

When the door switch signal changes from ON to OFF while the exterior lamp battery saver is activated,
the operation is discontinued, restarts and lasts for 45 seconds, then the illumination lamps will be turned
off.

쐌

When the door switch signal changes from OFF to ON while the exterior lamp battery saver is activated,
the operation is discontinued, restarts and lasts for 45 seconds, then the illumination lamps will be turned
off.

쐌

When the one of four door switch signals changes from OFF to ON while the exterior lamp battery saver
is activated, the operation is discontinued, restarts and lasts for 5 minutes seconds, then the illumination
lamps will be turned off.

쐌

When all the door switch ON signals are input while the exterior lamp battery saver is activated, the
operation is discontinued, restarts and lasts for 45 seconds, then the illumination lamps will be turned off.
Exterior lamp battery saver control time can be changed using “WORK SUPPORT” mode in “HEAD-
LAMP”.

When the lighting switch is turned from OFF to 2ND after illumination lamps are turned to off by the exterior
lamp battery saver control, ground is supplied

쐌

to smart entrance control unit terminals 20 and 58 from lighting switch terminal 11, and then,

쐌

to tail lamp relays terminal 2 from smart entrance control unit terminals 19 and 57.

Then illumination lamps illuminate again.
NOTE:
For Trouble Diagnoses for exterior lamp battery saver control, refer to “PARKING, LICENSE AND TAIL
LAMPS” (EL-80).