Ac system INFINITI QX4 2001 Factory Service Manual

Component Connector No. Power terminal Ground terminal
IVCS switch R10 2 12
Display & NAVI control unit M117, M118 8 24
A/C auto amp. M102 24 25
Clock M39 3 4
Globe box lamp M30 1 2
The ground for all of the components except for compass, glove box lamp and ashtray are controlled through
terminals 2 and 3 of the illumination control switch and body grounds M77 and M111.
BATTERY SAVER CONTROLNBEL0035S02When the ignition switch is turned from ON (or START) to OFF (or ACC) positions while illumination lamps
are illuminated, the RAP signal is supplied to terminal 10 of the headlamp battery saver control unit from smart
entrance control unit terminal 5.
After counting 45 seconds by the RAP signal from the smart entrance control unit to headlamp battery saver
control unit, the ground supply to terminal 1 of the tail lamp relay from headlamp battery saver control unit
teminals 6 and 14 is terminated.
Then illumination lamps are turned off.
Illumination lamps are turned off when driver or passenger side door is opened even if 45 seconds have not
passed after the ignition switch is turned from ON (or START) to OFF (or ACC) positions while illumination
lamps are illuminated.
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
Ito headlamp battery saver control unit terminals 5 and 13 from lighting switch terminal 11, and
Ito tail lamp relay terminal 1 from headlamp battery saver control unit terminals 6 and 14.
Then illumination lamps illuminate again.
NOTE:
For Trouble Diagnoses for battery saver control, refer to ªPARKING, LICENSE AND TAIL LAMPSº
(EL-66).
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ILLUMINATION
System Description (Cont'd)
EL-81

System DescriptionNBEL0038POWER SUPPLY AND GROUNDNBEL0038S06Power is supplied at all times:
Ithrough 7.5A fuse [No. 24, located in the fuse block (J/B)]
Ito key switch terminal 2 and
Ito smart entrance control unit terminal 10.
When the key is removed from ignition key cylinder, power is interrupted:
Ithrough key switch terminal 1
Ito smart entrance control unit terminal 32.
With the ignition key switch in the ON or START position, power is supplied:
Ithrough 7.5A fuse [No. 11, located in the fuse block (J/B)]
Ito smart entrance control unit terminal 33.
Ground is supplied:
Ito smart entrance control unit terminal 16
Ithrough body grounds terminals M77 and M111.
When the front driver side door is opened, ground is supplied:
Ithrough body grounds B11, B22 and D210
Ito front door switch (LH) terminal 2
Ifrom front door switch (LH) terminal 1
Ito smart entrance control unit terminal 29.
When the front passenger side door is opened, ground is supplied:
Ithrough case ground of front door switch (RH)
Ifrom front door switch (RH) terminal 1
Ito smart entrance control unit terminal 40.
When any other door (except front door) is opened, ground is supplied to smart entrance control unit termi-
nal 28 in the same manner as the front door switch (front passenger side).
When the front driver side door is unlocked, the smart entrance control unit receives a ground signal:
Ithrough body grounds terminals M77 and M111
Ito front door lock actuator (driver side unlock sensor) terminal 2
Ifrom front door lock actuator (driver side unlock sensor) terminal 4
Ito smart entrance control unit terminal 36.
When a signal, or combination of signals is received by the smart entrance control unit, ground is supplied:
Ithrough smart entrance control unit terminal 8
Ito interior lamp terminal 2.
With power and ground supplied, the interior lamp illuminates.
SWITCH OPERATIONNBEL0038S07When interior lamp switch is ON, ground is supplied:
Ithrough case grounds of interior lamp
Ito interior lamp.
And power is supplied:
Ito interior lamp terminal 1
Ifrom smart entrance control unit terminal 17.
When spot lamp (LH and/or RH) is ON, ground is supplied:
Ithrough body grounds M4, M66 and M147
Ito spot lamp terminal 2.
And power is supplied:
Ito spot lamp terminal 1
Ifrom smart entrance control unit terminal 17.
When vanity mirror illumination (LH and/or RH) is ON, ground is supplied:
Ithrough body grounds M4, M66 and M147
Ito vanity mirror illuminations (LH and RH) terminals 2.
INTERIOR, SPOT, VANITY MIRROR AND LUGGAGE ROOM LAMPS
System Description
EL-88

And power is supplied:
Ito vanity mirror illuminations (LH and RH) terminals 1
Ifrom smart entrance control unit terminal 17.
With power and ground supplied, interior lamps turn ON.
INTERIOR LAMP TIMER OPERATIONNBEL0038S08When interior lamp switch is in the ªDOORº position, the smart entrance control unit keeps the interior lamp
illuminated for about 30 seconds when:
Iunlock signal is supplied from driver's door unlock sensor while all doors are closed and key is removed
from ignition key cylinder
Iunlock signal is supplied from multi-remote controller while all doors are closed and driver's door is locked
Ikey is removed from ignition key cylinder while all doors are closed
Idriver's door is opened and then closed while key is removed from the iginition key cylinder. (However, if
the driver's door is closed with the key insered in the ignition key cylinder after the driver's door is opened
with the key removed, the timer is operated.)
The timer is canceled when:
Idriver's door is locked,
Idriver's door is opened, or
Iignition switch is turned ON.
ON-OFF CONTROLNBEL0038S09When the driver side door, front passenger door, rear LH, RH door or back door is opened, the interior room
lamp turns on while the interior room lamp switch is in the ªDOORº position.
BATTERY SAVERNBEL0038S10The lamp turns off automatically when interior lamp, luggage room lamp, spot lamp and/or vanity mirror illu-
mination is illuminated with the ignition key is in OFF position, if the lamp remains lit by the door switch open
signal or if the lamp switch is in ON position for more than 10 minutes.
After lamps turn OFF by the battery saver system, the lamps illuminate again when:
Idriver's door is locked or unlocked,
Idoor is opened or closed,
Ikey is inserted or removed in ignition key cylinder.
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INTERIOR, SPOT, VANITY MIRROR AND LUGGAGE ROOM LAMPS
System Description (Cont'd)
EL-89

Component Parts and Harness Connector
Location
NBEL0041
SEL351X
System DescriptionNBEL0042UNIFIED CONTROL METERNBEL0042S06ISpeedometer, odo/trip meter, tachometer, fuel gauge and water temperature gauge are controlled totally
by control unit.
IDigital meter is adopted for odo/trip meter.*
*The record of the odo meter is kept even if the battery cable is disconnected. The record of the trip meter
is erased when the battery cable is disconnected.
IOdo/trip meter is indicated for about 30 seconds after ignition switch has been turned OFF.
IOdo/trip meter segment can be checked in diagnosis mode.
IMeter/gauge can be checked in diagnosis mode.
HOW TO CHANGE THE DISPLAY FOR ODO/TRIP METERNBEL0042S07
SEL175W
NOTE:
Turn ignition switch to the ªONº position to operate odo/trip meter.
METERS AND GAUGES
Component Parts and Harness Connector Location
EL-94

POWER SUPPLY AND GROUND CIRCUITNBEL0042S08Power is supplied at all times
Ithrough 7.5A fuse [No. 24, located in the fuse block (J/B)]
Ito combination meter terminal 62.
With the ignition switch in the ON or START position, power is supplied
Ithrough 10A fuse [No. 8, located in the fuse block (J/B)]
Ito combination meter terminal 66.
Ground is supplied
Ito combination meter terminal 59
Ithrough body grounds M4, M66 and M147.
WATER TEMPERATURE GAUGENBEL0042S01The water temperature gauge indicates the engine coolant temperature. The reading on the gauge is based
on the resistance of the thermal transmitter.
As the temperature of the coolant increases, the resistance of the thermal transmitter decreases. A variable
ground is supplied to terminal 18 of the combination meter for the water temperature gauge. The needle on
the gauge moves from ªCº to ªHº.
TACHOMETERNBEL0042S02The tachometer indicates engine speed in revolutions per minute (rpm).
The tachometer is regulated by a signal
Ifrom terminal 25 of the ECM
Ito combination meter terminal 16 for the tachometer.
FUEL GAUGENBEL0042S03The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by a variable ground signal supplied
Ito combination meter terminal 17 for the fuel gauge
Ifrom terminal 3 of the fuel level sensor unit
Ithrough terminal 2 of the fuel level sensor unit and
Ithrough body grounds B11, B22 and D210.
SPEEDOMETERNBEL0042S04The vehicle speed sensor provides a voltage signal to the combination meter for the speedometer.
The voltage is supplied
Ifrom combination meter terminal 15 for the speedometer
Ito terminal 2 of the vehicle speed sensor.
The speedometer converts the voltage into the vehicle speed displayed.
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METERS AND GAUGES
System Description (Cont'd)
EL-95

Electrical Components Inspection=NBEL0202METER/GAUGE RESISTANCE CHECKNBEL0202S01Check resistance between installation screws of meter/gauge.
Screws
Resistance
W
Tacho/Speedometer Fuel/Temp. gauge
A - C A - C Approx. 190 - Approx. 260
B - D B - C Approx. 230 - Approx. 310
SEL352X
YEL066K
FUEL LEVEL SENSOR UNIT CHECKNBEL0202S02IFor removal, refer to FE-4, ªFUEL SYSTEMº.
Check the resistance between terminals 3 and 2.
Ohmmeter
Float position mm (in)Resistance
valueW
(+) (þ)
32*1 Full 95 (3.74) Approx.4-6
*2 1/2 184 (7.24) 31 - 34
*3 Empty 265 (10.43) 80 - 83
*1 and *3: When float rod is in contact with stopper.
MEL424F
THERMAL TRANSMITTER CHECKNBEL0202S03Check the resistance between the terminals of thermal transmitter
and body ground.
Water temperature Resistance
60ÉC (140ÉF) Approx. 170 - 210W
100ÉC (212ÉF) Approx. 47 - 53W
METERS AND GAUGES
Electrical Components Inspection
EL-108

System DescriptionNBEL0153
SEL713U
This unit displays following items:
IEarth magnetism and heading direction of vehicle.
IOutside air temperature.
ICaution for frozen road surfaces.
OUTSIDE TEMPERATURE DISPLAYNBEL0153S01Push the switch when the ignition key is in the ªACCº or ªONº position. The outside temperature will be dis-
played in ªÉFº.
ISelecting the indication range
Push the switch to change from ªÉFº to ªÉCº.
IWhen the outside temperature drops below freezing point, ICE is displayed on the unit.
IWhen the outside temperature is between 55ÉC (130ÉF) and 70ÉC (158ÉF), the display shows 55ÉC
(130ÉF).
IWhen the outside temperature is lower than þ30ÉC (þ20ÉF) or higher than 70ÉC (158ÉF), the display shows
only ª---º though it is operating. This is not a problem.
IThe indicated temperature on the thermometer is not readily affected by engine heat. It changes only when
one of the following conditions is present.
a) The temperature detected by the ambient air temperature sensor is lower than the indicated temperature
on the thermometer.
b) The difference in temperature detected during a period of 40 seconds is less than 1ÉC (1.8ÉF) when vehicle
speed has been greater than 24 km/h (15 MPH) for more than 100 seconds.
(This is to prevent the indicated temperature from being affected by engine heat or cooling fan operation
during low-speed driving.)
c) The ignition key has been turned to the ªOFFº position for more than 4 hours. (The engine is cold.)
DIRECTION DISPLAYNBEL0153S02Push the switch when the ignition key is in the ªACCº or ªONº position. The direction will be displayed.
COMPASS AND THERMOMETER
System Description
EL-110

Trouble DiagnosesNBEL0048PRELIMINARY CHECK FOR THERMOMETERNBEL0048S02
1 COOL DOWN CHECK
1. Turn the ignition key switch to the ªACCº position.
2. Cool down the ambient air temperature sensor with water or ice, so that the indicated temperature falls.
Does the indicated temperature fall?
Ye s©GO TO 2.
No©The system is malfunctioning. Check the system following ªINSPECTION/COMPASS
AND THERMOMETERº.
2 WARM UP CHECK
1. Leave the vehicle for 10 minutes, so that the indicated temperature rises.
2. With the ignition key in the ªACCº position, disconnect and reconnect the ambient air temperature sensor connector.
Does the indicated temperature rise?
Ye s©The system is OK.
No©The system is malfunctioning. Check the system following ªINSPECTION/COMPASS
AND THERMOMETERº.
NOTE:
IWhen the outside temperature is between 55ÉC (130ÉF) and 70ÉC (158ÉF), the display shows 55ÉC
(130ÉF). When the outside temperature is lower than þ30ÉC (þ20ÉF) or higher than 70ÉC (158ÉF), the dis-
play shows only ª---º.
IThe indicated temperature on the thermometer is not readily affected by engine heat. It changes only when
one of the following conditions is present.
a) The temperature detected by the ambient air temperature sensor is lower than the indicated temperature
on the thermometer.
b) The difference in temperature detected during a period of 40 seconds is less than 1ÉC (1.8ÉF) when vehicle
speed has been greater than 24 km/h (15 MPH) for more than 100 seconds.
(This is to prevent the indicated temperature from being affected by engine heat or cooling fan operation
during low-speed driving.)
c) The ignition key has been turned to the ªOFFº position for more than 4 hours. (The engine is cold.)
INSPECTION/COMPASS AND THERMOMETERNBEL0048S01
Symptom Possible causes Repair order
No display at all 1. 10A fuse
2. Ground circuit
3. Compass and thermometer1. Check 10A fuse [No. 9, located in fuse block (J/B)].
Turn the ignition switch ON and verify that battery positive
voltage is at terminal 7 of compass and thermometer.
2. Check ground circuit for compass and thermometer.
3. Replace compass and thermometer.
Forward direction indi-
cation slips off the
mark or incorrect.1. In manual correction mode (Bar
and display vanish.)
2. Zone variation change is not done.1. Drive the vehicle and turn at an angle of 90É.
2. Perform the zone variation change.
Compass reading
remains unchanged.1. Vehicle speed sensor is not
entered.
2. Compass and thermometer1. Check harness for open or short between combination meter
terminal 13 and compass and thermometer terminal 1.
2. Replace compass and thermometer.
Displays wrong tem-
perature when ambient
temperature is between
þ30ÉC (þ20ÉF) and
55ÉC (130ÉF). (See
NOTE above.)1. Check operation
2. Ambient air temperature sensor
circuit
3. Vehicle speed sensor is not
entered.
4. Ambient air temperature sensor
5. Compass and thermometer1. Perform preliminary check shown above.
2. Check harness for open or short between ambient air tem-
perature sensor and compass and thermometer.
3. Check harness for open or short between combination meter
terminal 13 and compass and thermometer terminal 1.
4. Replace ambient air temperature sensor.
5. Replace compass and thermometer.
COMPASS AND THERMOMETER
Trouble Diagnoses
EL-112

Component Parts and Harness Connector
Location
NBEL0052
SEL046W
System DescriptionNBEL0053The warning chime is controlled by the smart entrance control unit.
The warning chime is located in the smart entrance control unit.
Power is supplied at all times
Ithrough 7.5A fuse [No. 24, located in the fuse block (J/B)]
Ito smart entrance control unit terminal 10, and
Ito key switch terminal 2, and
Ithrough 10A fuse [No. 61, located in the fuse block (J/B)]
Ito tail lamp relay terminals 2 and 3.
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)]
Ito smart entrance control unit terminal 33.
Ground is supplied to smart entrance control unit terminal 16 through body grounds M77 and M111.
IGNITION KEY WARNING CHIMENBEL0053S01With the key in the ignition switch in the OFF or ACC position, and the driver's door open, the warning chime
will sound. Power is supplied
Ifrom key switch terminal 1
Ito smart entrance control unit terminal 32.
Ground is supplied
Ifrom front door switch LH terminal 1
Ito smart entrance control unit terminal 29.
Front door switch LH terminal 2 is grounded through body grounds B11, B22 and D210.
LIGHT WARNING CHIMENBEL0053S02With ignition switch OFF or ACC, driver's door open, warning chime will sound. [Except when headlamp bat-
tery saver control operates (for 45 seconds after ignition switch is turned to OFF or ACC position) and head-
lamps do not illuminate.] Power is supplied.
Ifrom tail lamp relay terminal 5
Ito smart entrance control unit terminal 34.
Ground is supplied
Ifrom front door switch LH terminal 1
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WARNING CHIME
Component Parts and Harness Connector Location
EL-125

Ito smart entrance control unit terminal 29.
Front door switch LH terminal 2 is grounded through body grounds B11, B22 and D210.
SEAT BELT WARNING CHIMENBEL0053S03With ignition switch turned ON and seat belt unfastened (seat belt switch ON), warning chime will sound for
approximately 6 seconds.
Ground is supplied
Ifrom seat belt switch terminal 1
Ito smart entrance control unit terminal 22.
Seat belt switch terminal 2 is grounded through body grounds B11, B22 and D210.
WARNING CHIME
System Description (Cont'd)
EL-126