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Infiniti QX4. Electrical System (2003 year). Manual - part 2

ENGINE ROOM HARNESS

NBEL0250S02

MEL393Q

IDX

GROUND

Ground Distribution (Cont’d)

EL-21

MEL759N

GROUND

Ground Distribution (Cont’d)

EL-22

ENGINE CONTROL HARNESS

NBEL0250S03

MEL394Q

IDX

GROUND

Ground Distribution (Cont’d)

EL-23

MEL233M

GROUND

Ground Distribution (Cont’d)

EL-24

BODY HARNESS RH

NBEL0250S04

MEL407R

IDX

GROUND

Ground Distribution (Cont’d)

EL-25

MEL396Q

GROUND

Ground Distribution (Cont’d)

EL-26

BODY HARNESS LH

NBEL0250S05

MEL397Q

IDX

GROUND

Ground Distribution (Cont’d)

EL-27

MEL844N

GROUND

Ground Distribution (Cont’d)

EL-28

MEL398Q

IDX

GROUND

Ground Distribution (Cont’d)

EL-29

BODY HARNESS

=NBEL0250S06

MEL152M

GROUND

Ground Distribution (Cont’d)

EL-30

Check

NBEL0251

MEL223P

IDX

COMBINATION SWITCH

Check

EL-31

MEL224P

Replacement

NBEL0252

For removal and installation of spiral cable, refer to RS-18,
“Installation — Air Bag Module and Spiral Cable”.

쐌

Each switch can be replaced without removing combination
switch base.

MEL326G

쐌

To remove combination switch base, remove base attaching
screw.

SEL151V

쐌

Before installing the steering wheel, align the steering wheel
guide pins with the screws which secure the combination
switch as shown in the left figure.

COMBINATION SWITCH

Replacement

EL-32

Check

NBEL0253

WITHOUT ICC SYSTEM

NBEL0253S01

MEL386Q

IDX

STEERING SWITCH

Check

EL-33

WITH ICC SYSTEM

NBEL0253S02

MEL387Q

STEERING SWITCH

Check (Cont’d)

EL-34

Component Parts and Harness Connector
Location

NBEL0254

SEL668Y

System Description

NBEL0255

The headlamp operation is controlled by the lighting switch which is built into the combination switch and smart
entrance control unit. And the headlamp battery saver system is controlled by the smart entrance control unit.

OUTLINE

NBEL0255S01

Power is supplied at all times

쐌

to headlamp LH relay terminals 1 and 3

쐌

through 15A fuse (No. 60, located in the fuse and fusible link box), and

쐌

to headlamp LH relay terminal 6

쐌

through 20A fuse (No. 32, located in fuse and fusible link box), and

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 headlamp RH relay terminal 6

쐌

through 20A fuse (No. 31, located in 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 the ignition switch is in the 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.

IDX

HEADLAMP (FOR USA) — XENON TYPE —

Component Parts and Harness Connector Location

EL-35

POWER SUPPLY TO LOW BEAM AND HIGH BEAM

NBEL0255S02

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

쐌

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

쐌

through smart entrance control unit terminals 22 and 60,

쐌

from lighting switch terminal 12

Headlamp relays (LH and RH) are energized and then power is supplied to headlamps (LH and RH).

LOW BEAM OPERATION

NBEL0255S03

When the lighting switch is turned to the 2ND position and placed in LOW (“B”) position, power is supplied

쐌

from terminal 7 of each headlamp relay

쐌

to terminal 3 of each headlamp

Ground is supplied

쐌

to headlamp LH terminal 4

쐌

through body grounds E13 and E41, and

쐌

to headlamp RH terminal 4

쐌

through body grounds E13 and E41.

With power and ground supplied, the headlamp(s) will illuminate.

HIGH BEAM OPERATION/FLASH-TO-PASS OPERATION

NBEL0255S04

When the lighting switch is turned to the 2ND position and placed in HIGH (“A”) position or PASS (“C”) position,
power is supplied

쐌

from terminal 5 of each headlamp relay

쐌

to terminal 1 of each headlamp, and

쐌

to combination meter terminal 26 for the HIGH BEAM indicator.

Ground is supplied

쐌

to headlamp LH terminal 2, and

쐌

to combination meter terminal 27 for the HIGH BEAM indicator

쐌

through lighting switch terminals 6 and 5

쐌

through body grounds E13 and E41, and

쐌

to headlamp RH terminal 2

쐌

through lighting switch terminals 9 and 8

쐌

through body grounds E13 and E41.

With power and ground supplied, the high beams and the high beam indicator illuminate.

EXTERIOR LAMP BATTERY SAVER CONTROL

NBEL0255S05

Except for Auto Light Control Operation

NBEL0255S0501

Headlamps 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 headlamps will be turned off.
When the lighting switch is turned from OFF to 2ND after headlamps 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 headlamp LH and RH relays terminal 2 from smart entrance control unit terminals 21 and 59,

쐌

through smart entrance control unit terminals 22 and 60 and

쐌

through lighting switch terminal 12.

Then headlamps illuminate again.

Auto light control operation

NBEL0255S0502

While the headlamps 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, and restarts and lasts for 45 seconds, then the headlamps will be turned
off.

HEADLAMP (FOR USA) — XENON TYPE —

System Description (Cont’d)

EL-36

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