Infiniti QX4. Electrical System (2003 year). Manual — part 2
ENGINE ROOM HARNESS
NBEL0250S02
MEL393Q
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
GROUND
Ground Distribution (Cont’d)
EL-21
MEL759N
GROUND
Ground Distribution (Cont’d)
EL-22
ENGINE CONTROL HARNESS
NBEL0250S03
MEL394Q
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
GROUND
Ground Distribution (Cont’d)
EL-23
MEL233M
GROUND
Ground Distribution (Cont’d)
EL-24
BODY HARNESS RH
NBEL0250S04
MEL407R
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
GROUND
Ground Distribution (Cont’d)
EL-25
MEL396Q
GROUND
Ground Distribution (Cont’d)
EL-26
BODY HARNESS LH
NBEL0250S05
MEL397Q
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
GROUND
Ground Distribution (Cont’d)
EL-27
MEL844N
GROUND
Ground Distribution (Cont’d)
EL-28
MEL398Q
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
GROUND
Ground Distribution (Cont’d)
EL-29
BODY HARNESS
=NBEL0250S06
MEL152M
GROUND
Ground Distribution (Cont’d)
EL-30
Check
NBEL0251
MEL223P
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
COMBINATION SWITCH
Check
EL-31
MEL224P
Replacement
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
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
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.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
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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