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Infiniti QX4. Electrical System (2003 year). Manual - part 13

SEL430TB

REAR WINDOW DEFOGGER SWITCH

NBEL0339S02

With NAVI

NBEL0339S0201

Check continuity between terminals when rear window defogger
switch is pushed and released.

Terminals

Condition

Continuity

1 - 2

Rear window defogger
switch is pushed

Yes

Rear window defogger
switch is released

SEL544Y

Without NAVI

NBEL0339S0202

Check voltage between A/C auto amp. and ground, when rear
window switch is pushed and released.

Terminals

Condition

Voltage (V)

(+)

(−)

Connector

Terminal

(Wire color)

M102

31 (OR)

Ground

Rear window
defogger switch is
pushed

Rear window
defogger switch is
released

Battery volt-

age

SEL263

Filament Check

NBEL0340

Attach probe circuit tester (in volt range) to middle portion of
each filament.

IDX

REAR WINDOW DEFOGGER

Electrical Components Inspection (Cont’d)

EL-197

SEL265

If a filament is burned out, circuit tester registers 0 or 12 volts.

To locate burned out point, move probe to left and right along
filament. Test needle will swing abruptly when probe passes
the point.

SEL122R

쐌

When measuring voltage, wrap tin foil around the top of
the negative probe. Then press the foil against the wire
with your finger.

Filament Repair

NBEL0341

REPAIR EQUIPMENT

NBEL0341S01

Conductive silver composition (Dupont No. 4817 or equivalent)

Ruler 30 cm (11.8 in) long

Drawing pen

Heat gun

Alcohol

Cloth

BE540

REPAIRING PROCEDURE

NBEL0341S02

Wipe broken heat wire and its surrounding area clean with a
cloth dampened in alcohol.

Apply a small amount of conductive silver composition to tip of
drawing pen.

Shake silver composition container before use.
3.

Place ruler on glass along broken line. Deposit conductive sil-
ver composition on break with drawing pen. Slightly overlap
existing heat wire on both sides [preferably 5 mm (0.20 in)] of
the break.

REAR WINDOW DEFOGGER

Filament Check (Cont’d)

EL-198

SEL012D

After repair has been completed, check repaired wire for con-
tinuity. This check should be conducted 10 minutes after silver
composition is deposited.

Do not touch repaired area while test is being conducted.

SEL013D

Apply a constant stream of hot air directly to the repaired area
for approximately 20 minutes with a heat gun. A minimum dis-
tance of 3 cm (1.2 in) should be kept between repaired area
and hot air outlet. If a heat gun is not available, let the repaired
area dry for 24 hours.

IDX

REAR WINDOW DEFOGGER

Filament Repair (Cont’d)

EL-199

System Description

NBEL0342

Refer to Owner’s Manual for audio system operating instructions.
Power is supplied at all times

쐌

through 15A fuse [No. 4, located in the fuse block (J/B)]

쐌

to audio unit terminal 6,

쐌

to audio amp. relay terminal 3,

쐌

to rear speaker amp. terminal 11 and

쐌

to AUX BOX terminal 7 (with rear TV)

With the ignition switch in the ACC or ON position, power is supplied

쐌

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

쐌

to audio unit terminal 10 and

쐌

to AUX BOX terminal 6 (with rear TV)

Ground is supplied through the case of the audio unit.
Ground is supplied

쐌

to audio amp. relay terminal 2

쐌

through body grounds M4, M66 and M147

쐌

to front door speaker LH terminal 5 and

쐌

to front door speaker RH terminal 5

쐌

through body grounds M77 and M111

쐌

to rear speaker amp. terminal 24 and

쐌

to AUX BOX terminal 8 (with rear TV)

쐌

through body grounds B11, B22 and D210.

When the audio unit POWER button is pressed, power is supplied

쐌

to rear speaker amp. terminal 9 and

쐌

to audio amp. relay terminal 1

쐌

from audio unit terminal 12.

Then audio amp. relay is energized and power is supplied

쐌

to front door speaker LH terminal 4 and

쐌

to front door speaker RH terminal 4.

Audio signals are supplied

쐌

through audio unit terminals 1, 2, 3, 4, 13, 14, 15 and 16

쐌

to terminals 2 and 6 of the LH and RH front speakers and terminals 5, 7, 18 and 20 of the rear speaker
amp.

쐌

to LH and RH tweeters through terminals 1 and 3 of the front speakers

쐌

to rear LH and RH speakers through terminals 1, 2, 25 and 26 of the rear speaker amp.

When the rear TV switch is ON, power is supplied

쐌

to rear TV switch terminal 1

쐌

from AUX BOX terminal 5.

Ground is supplied

쐌

to rear TV switch terminal 3

쐌

through body grounds B55 and M75.

AUDIO

System Description

EL-200

Schematic

NBEL0344

MEL200N

IDX

AUDIO

Schematic

EL-201

Wiring Diagram — AUDIO —

NBEL0345

MEL201N

AUDIO

Wiring Diagram — AUDIO —

EL-202

MEL202N

IDX

AUDIO

Wiring Diagram — AUDIO — (Cont’d)

EL-203

MEL203N

AUDIO

Wiring Diagram — AUDIO — (Cont’d)

EL-204

MEL399R

IDX

AUDIO

Wiring Diagram — AUDIO — (Cont’d)

EL-205

Trouble Diagnoses

NBEL0346

AUDIO UNIT

NBEL0346S01

Symptom

Possible causes

Repair order

Audio unit inoperative (no
digital display and no
sound from speakers).

1. 10A fuse
2. Poor audio unit case ground
3. Audio unit

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

Turn ignition switch ON and verify that battery posi-
tive voltage is present at terminal 10 of audio unit.

2. Check audio unit case ground.
3. Remove audio unit for repair.

Audio unit presets are lost
when ignition switch is
turned OFF.

1. 15A fuse
2. Audio unit

1. Check 15A fuse [No. 4, located in fuse block (J/B)]

and verify that battery positive voltage is present at
terminal 6 of audio unit.

2. Remove audio unit for repair.

AM stations are weak or
noisy (FM stations OK).

1. Antenna
2. Poor audio unit ground
3. Audio unit

1. Check antenna.
2. Check audio unit ground.
3. Remove audio unit for repair.

FM stations are weak or
noisy (AM stations OK).

1. Window antenna
2. Audio unit

1. Check window antenna.
2. Remove audio unit for repair.

Audio unit generates noise
in AM and FM modes with
engine running.

1. Poor audio unit ground
2. Loose or missing ground bonding straps
3. Ignition condenser or rear window defog-

ger noise suppressor condenser

4. Alternator
5. Ignition coil or secondary wiring
6. Audio unit

1. Check audio unit ground.
2. Check ground bonding straps.
3. Replace ignition condenser or rear window defogger

noise suppressor condenser.

4. Check alternator.
5. Check ignition coil and secondary wiring.
6. Remove audio unit for repair.

Audio unit generates noise
in AM and FM modes with
accessories on (switch
pops and motor noise).

1. Poor audio unit ground
2. Antenna
3. Accessory ground
4. Faulty accessory

1. Check audio unit ground.
2. Check antenna.
3. Check accessory ground.
4. Replace accessory.

Audio unit controls are
operational, but no sound
is heard from any speaker.

1. 15A fuse
2. Audio unit output
3. Audio unit

1. Check 15A fuse [No. 4, located in fuse block (J/B)].

Verify battery positive voltage is present at terminal
3 of audio amp. relay.

2. Check audio unit output voltage (Terminal 12).
3. Remove audio unit for repair.

All front speakers are inop-
erative.

1. Audio amp. relay
2. Audio amp. relay ground
3. Amp. ON signal

1. Check audio amp. relay.
2. Check audio amp. relay ground (Terminal 2).
3. Turn ignition switch ACC and audio unit ON. Verify

battery positive voltage is present at terminal 1 of
audio amp. relay.

Individual front speaker is
noisy or inoperative.

1. Speaker ground
2. Power supply
3. Audio unit output
4. Speaker

1. Check speaker ground (Terminal 5).
2. Check power supply for speaker (Terminal 4).
3. Check audio unit output voltage for speaker.
4. Replace speaker.

Both rear speakers are
inoperative.

1. Poor rear speaker amp. ground
2. Power supply
3. Amp. ON signal
4. Rear speaker amp.

1. Check rear speaker amp. ground circuit.
2. Check power supply for rear speaker amp. (Terminal

11).

3. Turn ignition switch ACC and audio unit ON. Verify

battery positive voltage is present at terminal 9 of
rear speaker amp.

4. Remove rear speaker amp. for repair.

Individual rear speaker is
noisy or inoperative.

1. Speaker
2. Audio unit/amp. output
3. Speaker circuit
4. Audio unit

1. Check speaker.
2. Check audio unit/amp. output.
3. Check wires for open or short between audio unit/

amp. and speakers.

4. Remove audio unit for repair.

AUDIO

Trouble Diagnoses

EL-206

Inspection

NBEL0347

AUDIO UNIT AND AMP.

NBEL0347S01

All voltage inspections are made with:

쐌

Ignition switch ON or ACC

쐌

Audio unit ON

쐌

Audio unit and amps. connected (If audio unit or amp. is removed for inspection, supply a ground to the
case using a jumper wire.)

ANTENNA

NBEL0347S02

1. Using a jumper wire, clip an auxiliary ground between antenna and body.

쐌

If reception improves, check antenna ground (at body surface).

쐌

If reception does not improve, check main feeder cable for short circuit or open circuit.

IDX

AUDIO

Inspection

EL-207

Wiring Diagram — REMOTE —

NBEL0349

MEL324Q

AUDIO

Wiring Diagram — REMOTE —

EL-208

System Description

NBEL0350

Power is supplied at all times

쐌

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

쐌

to power antenna terminal 6.

Ground is supplied to the power antenna terminal 2 through body grounds M4, M66 and M147.
When the ignition switch is in the ACC or ON position, power is supplied

쐌

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

쐌

to audio unit terminal 10.

When the audio unit is turned to the ON position, battery positive voltage is supplied

쐌

through audio unit terminal 5

쐌

to power antenna terminal 4.

The antenna raises and is held in the extended position.
When the audio unit is turned to the OFF position, battery positive voltage is interrupted

쐌

from audio unit terminal 5

쐌

to power antenna terminal 4.

The antenna retracts.

IDX

AUDIO ANTENNA

System Description

EL-209

Wiring Diagram — P/ANT —

NBEL0351

MEL824L

AUDIO ANTENNA

Wiring Diagram — P/ANT —

EL-210

Trouble Diagnoses

NBEL0352

POWER ANTENNA

NBEL0352S01

Symptom

Possible causes

Repair order

Power antenna does not
operate.

1. 7.5A fuse
2. Audio unit signal
3. Grounds M4, M66 and M147

1. Check 7.5A fuse [No. 24, located in fuse block

(J/B)]. Verify that battery positive voltage is present
at terminal 6 of power antenna.

2. Turn ignition switch and audio unit ON. Verify that

battery positive voltage is present at terminal 4 of
power antenna.

3. Check grounds M4, M66 and M147.

Location of Antenna

NBEL0353

YEL067K

MEL036G

Antenna Rod Replacement

NBEL0354

REMOVAL

NBEL0354S01

Remove antenna nut and antenna base.

IDX

AUDIO ANTENNA

Trouble Diagnoses

EL-211

MEL037G

Withdraw antenna rod while raising it by operating antenna
motor.

MEL038G

INSTALLATION

NBEL0354S02

Lower antenna rod by operating antenna motor.

Insert gear section of antenna rope into place with it facing
toward antenna motor.

As soon as antenna rope is wound on antenna motor, stop
antenna motor. Insert antenna rod lower end into antenna
motor pipe.

Retract antenna rod completely by operating antenna motor.

Install antenna nut and base.

AUDIO ANTENNA

Antenna Rod Replacement (Cont’d)

EL-212

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