Infiniti QX4. Electrical System (2003 year). Manual — part 9

Schematic

NBEL0299

MEL389Q

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METERS AND GAUGES

Schematic

EL-133

Wiring Diagram — METER —

NBEL0300

MEL308Q

METERS AND GAUGES

Wiring Diagram — METER —

EL-134

Meter/Gauge Operation and Odo/Trip Meter
Segment Check in Diagnosis Mode

NBEL0301

DIAGNOSIS FUNCTION

NBEL0301S01

쐌

Odo/trip meter segment can be checked in diagnosis mode.

쐌

Meters/gauges can be checked in diagnosis mode.

HOW TO ALTERNATE DIAGNOSIS MODE

NBEL0301S02

1.

Turn ignition switch to ON and change odo/trip meter to “TRIP
A” or “TRIP B”.

2.

Turn ignition switch to OFF.

3.

Turn ignition switch to ON when pushing odo/trip meter switch.

4.

Push odo/trip meter switch 1 second.

5.

Release odo/trip meter switch.

6.

Push odo/trip meter switch more than three times within 7
seconds.

SEL176W

7.

All odo/trip meter segments should be turned on.

NOTE:
If some segments are not turned on, unified meter control unit with
odo/trip meter should be replaced.

At this point, the unified control meter is turned to diagnosis
mode.

SEL177W

8.

Push odo/trip meter switch. Indication of each meter/gauge
should be as shown left during pushing odo/trip meter switch
if it is no malfunctioning.

NOTE:
It takes about a few seconds for indication of fuel gauge and water
temperature gauge to become stable.

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METERS AND GAUGES

Meter/Gauge Operation and Odo/Trip Meter Segment Check in Diagnosis Mode

EL-135

Trouble Diagnoses

NBEL0302

PRELIMINARY CHECK

NBEL0302S01

SEL361W

*1: Meter/Gauge Operation and Odo/

Trip Meter Segment Check in
Diagnosis Mode (EL-135)

*2: METER/GAUGE RESISTANCE

CHECK (EL-143)

*3: POWER SUPPLY AND GROUND

CIRCUIT CHECK (EL-138)

*4: Symptom Chart 1 (EL-137)

*5: Symptom Chart 2 (EL-137)

METERS AND GAUGES

Trouble Diagnoses

EL-136

SYMPTOM CHART

NBEL0302S02

Symptom Chart 1 (Malfunction is Indicated in
Diagnosis Mode)

NBEL0302S0203

Symptom

Possible causes

Repair order

Odo/trip meter indicate(s)
malfunction in Diagnosis
mode.

Unified meter control unit

Replace unified meter control unit.

Multiple meter/gauge indi-
cate malfunction in Diagno-
sis mode.

One of speedometer/
tachometer/fuel gauge/
water temp. gauge indi-
cates malfunction in Diag-
nosis mode.

1. Meter/Gauge
2. Unified meter control unit

1. Check resistance of meter/gauge indicating malfunc-

tion. If the resistance is NG, replace the meter/
gauge. Refer to “METER/GAUGE RESISTANCE
CHECK”, EL-143.

2. If the resistance of meter/gauge is OK, replace uni-

fied meter control unit.

Symptom Chart 2 (No Malfunction is Indicated in
Diagnosis Mode)

NBEL0302S0204

Symptom

Possible causes

Repair order

One of speedometer/
tachometer/fuel gauge/
water temp. gauge is mal-
functioning.

1. Sensor signal

- Vehicle speed signal
- Engine revolution signal
- Fuel gauge
- Water temp. gauge

2. Unified meter control unit

1. Check the sensor for malfunctioning meter/gauge.

INSPECTION/VEHICLE SPEED SIGNAL (Refer to
EL-139.)
INSPECTION/ENGINE REVOLUTION SIGNAL
(Refer to EL-140.)
INSPECTION/FUEL LEVEL SENSOR UNIT (Refer to
EL-141.)
INSPECTION/THERMAL TRANSMITTER (Refer to
EL-142.)

2. Replace unified meter control unit.

Multiple meter/gauge are
malfunctioning. (except
odo/trip meter)

Before starting trouble diagnoses below, perform PRELIMINARY
CHECK, EL-136.

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METERS AND GAUGES

Trouble Diagnoses (Cont’d)

EL-137

SEL827Y

POWER SUPPLY AND GROUND CIRCUIT CHECK

=NBEL0302S03

Power Supply Circuit Check

NBEL0302S0301

Terminals

Ignition switch position

(+)

(−)

OFF

ACC

ON

Connector

Terminal

(wire color)

M25

31 (G/R)

Ground

0V

Battery
voltage

Battery
voltage

M26

62 (G/R)

Ground

Battery
voltage

Battery
voltage

Battery
voltage

66 (W/B)

Ground

0V

0V

Battery
voltage

If NG, check the following.

쐌

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

쐌

10A fuse [No. 8, located in fuse block (J/B)]

쐌

10A fuse [No. 9, located in fuse block (J/B)]

쐌

Harness for open or short between fuse and combination
meter

SEL057Y

Ground Circuit Check

NBEL0302S0302

Terminals

Continuity

(+)

(−)

Connector

Terminal

(wire color)

M26

59 (B)

Ground

Yes

63 (SB)

METERS AND GAUGES

Trouble Diagnoses (Cont’d)

EL-138

INSPECTION/VEHICLE SPEED SIGNAL

=NBEL0302S04

1

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) OUTPUT SIGNAL

With CONSULT-II

1. Lift up drive wheels.
2. Start engine and drive vehicle at more than 20 km/h (12 MPH).
3. Check signal between combination meter harness connector M24 terminal 15 (G/Y) and ground when rotating wheels

with engine at idle. (Use “SIMPLE OSCILLOSCOPE” in “SUB MODE” with CONSULT-II.)

SEL938W

Without CONSULT-II

1. Lift up drive wheels.
2. Start engine and drive vehicle at more than 20 km/h (12 MPH).
3. Check voltage between combination meter harness connector M24 terminal 15 (G/Y) and ground when rotating wheels

with engine at idle.

SEL939WA

OK or NG

OK

䊳

ABS actuator and electric unit is OK.

NG

䊳

Check the following.

쐌

Harness for open or short between ABS actuator and electric unit (control unit) and
combination meter.

쐌

ABS actuator and electric unit (control unit). Refer to BR-54, “Wheel Sensor or Rotor”.

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METERS AND GAUGES

Trouble Diagnoses (Cont’d)

EL-139

INSPECTION/ENGINE REVOLUTION SIGNAL

NBEL0302S05

1

CHECK ECM OUTPUT

1. Start engine.
2. Check voltage between combination meter harness connector terminal 16 and ground at idle and 2,000 rpm.

SEL364WB

OK or NG

OK

䊳

Engine revolution signal is OK.

NG

䊳

Harness for open or short between ECM and combination meter

METERS AND GAUGES

Trouble Diagnoses (Cont’d)

EL-140

INSPECTION/FUEL LEVEL SENSOR UNIT

=NBEL0302S06

1

CHECK GROUND CIRCUIT FOR FUEL LEVEL SENSOR UNIT

Check harness continuity between fuel level sensor unit harness connector terminal 2 and ground.

SEL299X

OK or NG

OK

䊳

GO TO 2.

NG

䊳

Repair harness or connector.

2

CHECK FUEL LEVEL SENSOR UNIT

Refer to “FUEL LEVEL SENSOR UNIT CHECK” (EL-143).

OK or NG

OK

䊳

GO TO 3.

NG

䊳

Replace fuel level sensor unit.

3

CHECK HARNESS FOR OPEN OR SHORT

1. Disconnect combination meter connector and fuel level sensor unit connector.
2. Check continuity between combination meter harness connector terminal 17 and fuel level sensor unit terminal 3.
3. Check continuity between combination meter harness connector terminal 17 and ground.

SEL300XB

OK or NG

OK

䊳

Fuel level sensor unit is OK.

NG

䊳

Repair harness or connector.

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METERS AND GAUGES

Trouble Diagnoses (Cont’d)

EL-141

INSPECTION/THERMAL TRANSMITTER

=NBEL0302S07

1

CHECK THERMAL TRANSMITTER

Refer to “THERMAL TRANSMITTER CHECK” (EL-143).

OK or NG

OK

䊳

GO TO 2.

NG

䊳

Replace.

2

CHECK HARNESS FOR OPEN OR SHORT

1. Disconnect combination meter connector and thermal transmitter connector.
2. Check continuity between combination meter harness connector terminal 18 and thermal transmitter harness connector

terminal 1.

Continuity should exist.

3. Check continuity between combination meter harness connector terminal 18 and ground.

Continuity should not exist.

SEL184WA

OK or NG

OK

䊳

Thermal transmitter is OK.

NG

䊳

Repair harness or connector.

METERS AND GAUGES

Trouble Diagnoses (Cont’d)

EL-142

Electrical Components Inspection

=NBEL0303

METER/GAUGE RESISTANCE CHECK

NBEL0303S05

Check resistance between installation screws of meter/gauge.

Screws

Resistance

Ω

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 CHECK

NBEL0303S02

쐌

For removal, refer to FE-4, “FUEL SYSTEM”.

Check the resistance between terminals 3 and 2.

Ohmmeter

Float position

mm (in)

Resistance

value

Ω

(+)

(−)

3

2

*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 CHECK

NBEL0303S03

Check the resistance between the terminals of thermal transmitter
and body ground.

Water temperature

Resistance

60°C (140°F)

Approx. 170 - 210

Ω

100°C (212°F)

Approx. 47 - 53

Ω

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METERS AND GAUGES

Electrical Components Inspection

EL-143

System Description

NBEL0304

SEL713U

This unit displays following items:

쐌

Earth magnetism and heading direction of vehicle.

쐌

Outside air temperature.

쐌

Caution for frozen road surfaces.

OUTSIDE TEMPERATURE DISPLAY

NBEL0304S01

Push the switch when the ignition key is in the “ACC” or “ON” position. The outside temperature will be dis-
played in “°F”.

쐌

Selecting the indication range
Push the switch to change from “°F” to “°C”.

쐌

When the outside temperature drops below freezing point, ICE is displayed on the unit.

쐌

When the outside temperature is between 55°C (130°F) and 70°C (158°F), the display shows 55°C
(130°F).

쐌

When the outside temperature is lower than −30°C (−20°F) or higher than 70°C (158°F), the display shows
only “---” though it is operating. This is not a problem.

쐌

The 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 1°C (1.8°F) 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 “OFF” position for more than 4 hours. (The engine is cold.)

DIRECTION DISPLAY

NBEL0304S02

Push the switch when the ignition key is in the “ACC” or “ON” position. The direction will be displayed.

COMPASS AND THERMOMETER

System Description

EL-144

Wiring Diagram — COMPAS —

NBEL0305

MEL309Q

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COMPASS AND THERMOMETER

Wiring Diagram — COMPAS —

EL-145

Trouble Diagnoses

NBEL0306

PRELIMINARY CHECK FOR THERMOMETER

NBEL0306S01

1

COOL DOWN CHECK

1. Turn the ignition key switch to the “ACC” position.
2. Cool down the ambient air temperature sensor with water or ice, so that the indicated temperature falls.

Does the indicated temperature fall?

Yes

䊳

GO TO 2.

No

䊳

The system is malfunctioning. Check the system following “INSPECTION/COMPASS
AND THERMOMETER”.

2

WARM UP CHECK

1. Leave the vehicle for 10 minutes, so that the indicated temperature rises.
2. With the ignition key in the “ACC” position, disconnect and reconnect the ambient air temperature sensor connector.

Does the indicated temperature rise?

Yes

䊳

The system is OK.

No

䊳

The system is malfunctioning. Check the system following “INSPECTION/COMPASS
AND THERMOMETER”.

NOTE:

쐌

When the outside temperature is between 55°C (130°F) and 70°C (158°F), the display shows 55°C
(130°F). When the outside temperature is lower than −30°C (−20°F) or higher than 70°C (158°F), the dis-
play shows only “---”.

쐌

The 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 1°C (1.8°F) 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 “OFF” position for more than 4 hours. (The engine is cold.)

INSPECTION/COMPASS AND THERMOMETER

NBEL0306S02

Symptom

Possible causes

Repair order

No display at all

1. 10A fuse
2. Ground circuit
3. Compass and thermometer

1. 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 90°.
2. Perform the zone variation change.

Compass reading
remains unchanged.

1. Vehicle speed signal is not entered.
2. Compass and thermometer

1. 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
−30°C (−20°F) and
55°C (130°F). (See
NOTE above.)

1. Check operation
2. Ambient air temperature sensor

circuit

3. Vehicle speed signal is not entered.
4. Ambient air temperature sensor
5. Compass and thermometer

1. 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-146

Calibration Procedure for Compass

=NBEL0307

The difference between magnetic North and geographical North
can sometimes be great enough to cause false compass readings.
In order for the compass to operate accurately in a particular zone,
it must be calibrated using the following procedure.

SEL738UA

SEL065V

CORRECTION FUNCTIONS OF COMPASS

NBEL0307S01

The direction display is equipped with automatic correction func-
tion. If the direction is not shown correctly, carry out initial correc-
tion.

INITIAL CORRECTION PROCEDURE FOR COMPASS

NBEL0307S02

1.

Pushing the “Mode” switch for about 10 seconds will enter the
initial correction mode. The direction bar starts blinking.

2.

Turn the vehicle slowly in an open, safe place. The initial cor-
rection is completed in one or two turns.

NOTE:
In places where the terrestrial magnetism is extremely disturbed,
the initial correction may start automatically.

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COMPASS AND THERMOMETER

Calibration Procedure for Compass

EL-147

Schematic

NBEL0308

MEL310Q

WARNING LAMPS

Schematic

EL-148