2001 INFINITI QX4 ECU

MEL304D
ReplacementNBEL0010For removal and installation of spiral cable, refer to RS-18,
ªInstallation Ð Air Bag Module and Spiral Cableº.
IEach switch can be replaced without removing combination
switch base.
MEL326G
ITo remove combination switch base, remove base attaching
screw.
SEL151V
IBefore installing the steering wheel, align the steering wheel
guide pins with the screws which secure the combination
switch as shown in the left figure.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
COMBINATION SWITCH
Replacement
EL-29

Trouble DiagnosesNBEL0189WARNING:
IThe xenon headlamp has a high-tension current generating area. Be extremely careful when remov-
ing and installing. Be certain to disconnect the battery negative cable prior to removing or install-
ing.
IWhen the xenon headlamp is lit, do not touch the harness (covered with red or amber insulation),
bulb itself or the bulb socket with your bare hands.
INever service a xenon headlamp with wet hands.
IWhen checking body side harness with a circuit tester, be certain to disconnect the harness con-
nector from the xenon headlamp.
IWhen the xenon headlamp is lit, the xenon bulb must be installed in the headlamp housing. (Never
turn on xenon headlamp, if the bulb is out of the headlamp housing.)
CAUTION:
Make sure to install the bulb securely; if the xenon bulb is improperly installed in its socket, high-ten-
sion current leaks occur. This may lead to a melted bulb and/or bulb socket.
Symptom Possible cause Repair order
Neither headlamp operates. 1. 7.5A fuse
2. Headlamp relay circuit
3. Lighting switch
4. Lighting switch ground circuit
5. Headlamp battery saver control
unit1. Check 7.5A fuse [No. 24, located in fuse block
(J/B)].
Verify battery positive voltage is present at terminal
7 of headlamp battery saver control unit.
2. Check between battery saver control unit and head-
lamp relays (LH and RH).
3. Check Lighting switch.
4. Check harness between lighting switch terminal 8
and ground.
5. Check headlamp battery saver control unit.
Headlamp LH (low and high beam)
does not operate, but headlamp
RH (low and high beam) does
operate.1. 15A fuse
2. Headlamp LH relay
3. Headlamp LH relay circuit1. Check 15A fuse (No. 60, located in fusible link and
fuse box). Verify battery positive voltage is present
at terminals 1 and 3 of headlamp LH relay.
2. Check headlamp LH relay.
3. Check harness between headlamp LH relay and
headlamp battery saver control unit.
Headlamp RH (low and high beam)
does not operate, but headlamp LH
(low and high beam) does operate.1. 15A fuse
2. Headlamp RH relay
3. Headlamp RH relay circuit1. Check 15A fuse (No. 59, located in fusible link and
fuse box). Verify battery positive voltage is present
at terminals 1 and 3 of headlamp RH relay.
2. Check headlamp RH relay.
3. Check harness between headlamp RH relay and
headlamp battery saver control unit.
LH high beam does not operate,
but LH low beam operates.1. Bulb
2. Headlamp LH relay
3. Open in the LH high beams cir-
cuit
4. Lighting switch
5. Lighting switch ground circuit1. Check bulb.
2. Check headlamp LH relay.
3. Check the following.
a. Harness between headlamp LH relay terminal 5 and
headlamp LH for open circuit.
b. Harness between headlamp LH and lighting switch
for open circuit.
4. Check lighting switch.
5. Check harness between lighting switch and ground.
HEADLAMP (FOR USA) Ð XENON TYPE Ð
Trouble Diagnoses
EL-40

SEL461X
2. Turn bulb socket counterclockwise with keep pushing, then
remove it.
SEL462X
3. Release retaining pin.
4. Remove the xenon bulb.
5. Install in the reverse order of removal.
CAUTION:
IWhen disposing of the xenon bulb, do not break it; always
dispose of it as is.
IMake sure to install the bulb securely; if the xenon bulb is
improperly installed in its socket, high-tension current
leaks occur. This may lead to a melted bulb and/or bulb
socket.
SEL463X
HIGH BEAMNBEL0190S021. Turn the bulb counterclockwise (LH high beam) or clockwise
(RH high beam).
2. Remove the bulb.
3. Install in the reverse order of removal.
SEL464X
Aiming AdjustmentNBEL0191LOW BEAMNBEL0191S011. Turn headlamp low beam on.
2. Use adjusting screws to perform aiming adjustment.
IFirst tighten the adjusting screw all the way and then
make adjustment by loosening the screw.
HEADLAMP (FOR USA) Ð XENON TYPE Ð
Bulb Replacement/Xenon Type (Cont'd)
EL-44

RemovalNBEL0060S02011. Remove 4 bolts that secure wiper motor.
2. Detach wiper motor from wiper linkage at ball joint.
3. Remove wiper linkage.
Be careful not to break ball joint rubber boot.
InstallationNBEL0060S0202IGrease ball joint portion before installation.
1. Installation is the reverse order of removal.
MEL137M
Washer Nozzle AdjustmentNBEL0061IAdjust washer nozzle with suitable tool as shown in the figure
at left.
Adjustable range:±10É
MEL417N
Unit: mm (in)
*1 315 (12.40) *7 443 (17.44)
*2 227 (8.94) *8 250 (9.84)
*3 122 (4.80) *9 80 (3.15)
*4 220 (8.66) *10 430 (16.93)
*5 315 (12.40) *11 250 (9.84)
*6 145 (5.71) *12 57 (2.24)
*A: The diameters of these circles are less than 80 mm (3.15 in).
*B: The diameter of this circle is less than 120´80 mm (4.72´3.15 in).
*C: The diameter of this circle is less than 100´80 mm (3.94´3.15 in).
MEL074H
Washer Tube LayoutNBEL0062
FRONT WIPER AND WASHER
Removal and Installation (Cont'd)
EL-140

System DescriptionNBEL0120DESCRIPTIONNBEL0120S011. Operation FlowNBEL0120S0101
SEL334W
2. Setting The Theft Warning SystemNBEL0120S0102Initial condition
1) Close all doors.
2) Close hood and glass hatch.
Disarmed phase
When the theft warning system is in the disarmed phase, the security indicator lamp blinks every 2.6 seconds.
Pre-armed phase and armed phase
The theft warning system turns into the ªpre-armedº phase when hood, glass hatch and all doors are closed
and the doors are locked by key or multi-remote controller. (The security indicator lamp illuminates.)
After about 30 seconds, the system automatically shifts into the ªarmedº phase (the system is set). (The
security indicator lamp blinks every 2.6 seconds.)
3. Canceling The Set Theft Warning SystemNBEL0120S0103When the following 1) or 2) operation is performed, the armed phase is canceled.
1) Unlock the doors with the key or multi-remote controller.
2) Open the glass hatch with the key.
4. Activating The Alarm Operation of The Theft Warning SystemNBEL0120S0104Make sure the system is in the armed phase. (The security indicator lamp blinks every 2.6 seconds.)
When any of the following operations is performed, the system sounds the horns and flashes the headlamps
for about 50 seconds.
1) Engine hood, glass hatch or any door is opened before unlocking door with key or multi-remote control-
ler.
2) Door is unlocked without using key or multi-remote controller.
3) Disconnecting and connecting the battery connector before canceling armed phase.
POWER SUPPLY AND GROUNDNBEL0120S07Power is supplied at all times
Ithrough 7.5A fuse [No. 24, located in the fuse block (J/B)]
Ito security indicator lamp terminal 1, and
Ito smart entrance control unit terminal 10.
With the ignition switch in the ON or START position, power is supplied
Ithrough 7.5A fuse [No. 11, located in the fuse block (J/B)]
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
THEFT WARNING SYSTEM
System Description
EL-295

Ito smart entrance control unit terminal 33.
With the ignition switch in the ACC or ON position, power is supplied
Ithrough 10A fuse [No. 10, located in the fuse block (J/B)]
Ito smart entrance control unit terminal 21.
Ground is supplied
Ito smart entrance control unit terminal 16
Ithrough body grounds M77 and M111.
INITIAL CONDITION TO ACTIVATE THE SYSTEMNBEL0120S02The operation of the theft warning system is controlled by the doors, hood and glass hatch.
To activate the theft warning system, the smart entrance control unit must receive signals indicating the doors,
hood and glass hatch are closed and the doors are locked.
When a door is open, smart entrance control unit terminal 28, 29 or 40 receives a ground signal from each
door switch.
When a door is unlocked, smart entrance control unit terminal 26, 36 or 37 receives a ground signal from ter-
minal 4 of each door unlock sensor or terminal 1 of back door unlock sensor.
When the hood is open, smart entrance control unit terminal 27 receives a ground signal
Ifrom terminal 1 of the hood switch
Ithrough body grounds E13 and E41.
When the glass hatch is open, smart entrance control unit terminal 38 receives a ground signal
Ifrom terminal 1 of the glass hatch switch
Ithrough body grounds D210, B11 and B22.
When the doors are locked with key or multi-remote controller and none of the described conditions exist, the
theft warning system will automatically shift to armed mode.
THEFT WARNING SYSTEM ACTIVATION (WITH KEY OR REMOTE CONTROLLER USED TO
LOCK DOORS)
NBEL0120S03If the key is used to lock doors, terminal 41 receives a ground signal
Ifrom terminal 3 of the key cylinder switch LH
Ithrough back grounds M77 and M111
Ifrom terminal 1 of the back door key cylinder switch
Ithrough body grounds B11, B22 and D210.
If this signal or lock signal from remote controller is received by the smart entrance control unit, the theft
warning system will activate automatically.
Once the theft warning system has been activated, smart entrance control unit terminal 31 supplies ground to
terminal 2 of the security indicator lamp.
The security lamp will illuminate for approximately 30 seconds and then blink.
Now the theft warning system is in armed phase.
THEFT WARNING SYSTEM ALARM OPERATIONNBEL0120S04The theft warning system is triggered by
Iopening a door
Iopening the hood or the glass hatch
Iunlocking door without using the key or multi-remote controller.
Once the theft warning system is in armed phase, if the smart entrance control unit receives a ground signal
at terminal 26, 36, 37 (door unlock sensor), 28, 29, 40 (door switch), 38 (glass hatch switch) or 27 (hood
switch), the theft warning system will be triggered. The headlamps flash and the horn sounds intermittently.
Power is supplied at all times
Ithrough 7.5A fuse (No. 52, located in fuse and fusible link box)
Ito horn relay terminals 1 and 3.
Ithrough 10A fuse (No. 54, located in fuse and fusible link box)
Ito horn relay terminal 6.
When the theft warning system is triggered, ground is supplied intermittently
Ifrom terminal 4 of the smart entrance control unit
Ito headlamp relay LH and RH terminal 2 and
Ifrom terminal 19 of the smart entrance control unit
THEFT WARNING SYSTEM
System Description (Cont'd)
EL-296

Trouble DiagnosesNBEL0123PRECAUTIONS FOR INFINITI COMMUNICATOR (IVCS)NBEL0123S12The purpose of INFINITI Communicator is to increase security for
the vehicle owner by providing a convenient way to contact the
most appropriate emergency assistance provider during an emer-
gency.
Improper operation of the system may result in a police response.
The theft warning system also activates INFINITI Communicator.
For details, refer to INFINITI Communicator (IVCS), EL-348.
PRELIMINARY CHECKNBEL0123S01The system operation is canceled by turning ignition switch to
ªACCº at any step between START and ARMED in the following
flow chart.
SEL733W
THEFT WARNING SYSTEM
Trouble Diagnoses
EL-306

After performing preliminary check, go to symptom chart
below.
SYMPTOM CHARTNBEL0123S02
REFERENCE PAGE (EL- ) 306 308 309 312 313 314 315 316 318 277
SYMPTOM
PRELIMINARY CHECK
POWER SUPPLY AND GROUND CIRCUIT CHECK
DOOR, HOOD AND GLASS HATCH SWITCH CHECK
SECURITY INDICATOR LAMP CHECK
DOOR UNLOCK SENSOR CHECK
DOOR KEY CYLINDER SWITCH CHECK
BACK DOOR KEY CYLINDER SWITCH CHECK
HORN ALARM CHECK
THEFT WARNING HEADLAMP ALARM CHECK
Check ªMULTI-REMOTE CONTROLº system.
1Theft warning indicator does
not illuminate for 30 seconds.XXXX
Theft warning
system cannot
be set by ....
All items X X X X
Door outside key X X
Back door key X X
Multi-remote control XX
2
*1 Theft warning
system does not
alarm when ...
Any door is opened. X X
Any door is
unlocked without
using key or multi-
remote controllerXX
3
Theft warning
alarm does not
activate.
All function X X X
Horn alarm X X
Headlamp alarm XX
4
Theft warning
system cannot be
canceled by ....
Door outside key X X
Back door key X X
Multi-remote control XX
X : Applicable
*1: Make sure the system is in the armed phase.
Before starting trouble diagnoses above, perform preliminary
check, EL-306.
Symptom numbers in the symptom chart correspond with those of
preliminary check.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
THEFT WARNING SYSTEM
Trouble Diagnoses (Cont'd)
EL-307