INFINITI QX4 2001 Factory Service Manual

3 CHECK REAR WINDOW DEFOGGER SWITCH INPUT SIGNAL
Check continuity between smart entrance control unit terminal 39 and ground.
SEL386X
OK or NG
OK©GO TO 4.
NG©Check the following.
IRear window defogger switch (with navigation system)
(Refer to EL-157.)
IA/C auto amp. (without navigation system)
IHarness for open or short between smart entrance control unit and rear window defog-
ger switch (with navigation system) or A/C auto amp. (without navigation system)
IRear window defogger switch (with navigation system) or A/C auto amp. (without navi-
gation system) ground circuit
4 CHECK IGNITION INPUT SIGNAL
Check voltage between smart entrance control unit terminal 33 and ground.
SEL387X
OK or NG
OK©GO TO 5.
NG©Check the following.
I7.5A fuse [No. 11, located in the fuse block (J/B)]
IHarness for open or short between smart entrance control unit and fuse
REAR WINDOW DEFOGGER
Trouble Diagnoses (Cont'd)
EL-156

5 CHECK SMART ENTRANCE CONTROL UNIT GROUND CIRCUIT
Check continuity between smart entrance control unit terminal 16 and ground.
SEL388X
OK or NG
OK©Replace smart entrance control unit.
NG©Repair harness or connectors.
SEC202B
Electrical Components InspectionNBEL0076REAR WINDOW DEFOGGER RELAYNBEL0076S01Check continuity between terminals 3 and 5, 6 and 7.
Condition Continuity
12V direct current supply between ter-
minals 1 and 2Ye s
No current supply No
SEL430TB
REAR WINDOW DEFOGGER SWITCHNBEL0076S02Check continuity between terminals when rear window defogger
switch is pushed and released.
Terminals Condition Continuity
1-2Rear window defogger
switch is pushedYe s
Rear window defogger
switch is releasedNo
SEL263
Filament CheckNBEL00771. Attach probe circuit tester (in volt range) to middle portion of
each filament.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
REAR WINDOW DEFOGGER
Trouble Diagnoses (Cont'd)
EL-157

SEL265
2. If a filament is burned out, circuit tester registers 0 or 12 volts.
3. To locate burned out point, move probe to left and right along
filament. Test needle will swing abruptly when probe passes
the point.
SEL122R
IWhen measuring voltage, wrap tin foil around the top of
the negative probe. Then press the foil against the wire
with your finger.
Filament RepairNBEL0078REPAIR EQUIPMENTNBEL0078S011) Conductive silver composition (Dupont No. 4817 or equivalent)
2) Ruler 30 cm (11.8 in) long
3) Drawing pen
4) Heat gun
5) Alcohol
6) Cloth
BE540
REPAIRING PROCEDURENBEL0078S021. Wipe broken heat wire and its surrounding area clean with a
cloth dampened in alcohol.
2. 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-158

SEL012D
4. 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
5. 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.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
REAR WINDOW DEFOGGER
Filament Repair (Cont'd)
EL-159

System DescriptionNBEL0079Refer to Owner's Manual for audio system operating instructions.
Power is supplied at all times
Ithrough 15A fuse [No. 4, located in the fuse block (J/B)]
Ito audio unit terminal 6,
Ito audio amp. relay terminal 3 and
Ito rear speaker amp. terminal 11.
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 audio unit terminal 10.
Ground is supplied through the case of the audio unit.
Ground is supplied
Ito audio amp. relay terminal 2
Ithrough body grounds M4, M66 and M147
Ito front door speaker LH terminal 5 and
Ito front door speaker RH terminal 5
Ithrough body grounds M77 and M111
Ito rear speaker amp. terminal 24
Ithrough body grounds B11, B22 and D210.
When the audio unit POWER button is pressed, power is supplied
Ito rear speaker amp. terminal 9 and
Ito audio amp. relay terminal 1
Ifrom audio unit terminal 12.
Then audio amp. relay is energized and power is supplied
Ito front door speaker LH terminal 4 and
Ito front door speaker RH terminal 4.
Audio signals are supplied
Ithrough audio unit terminals 1, 2, 3, 4, 13, 14, 15 and 16
Ito terminals 2 and 6 of the LH and RH front speakers and terminals 5, 7, 18 and 20 of the rear speaker
amp.
Ito LH and RH tweeters through terminals 1 and 3 of the front speakers
Ito rear LH and RH speakers through terminals 1, 2, 25 and 26 of the rear speaker amp.
AUDIO
System Description
EL-160

SchematicNBEL0080
MEL817L
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUDIO
Schematic
EL-161

Wiring Diagram Ð AUDIO ÐNBEL0081
MEL818L
AUDIO
Wiring Diagram Ð AUDIO Ð
EL-162

MEL819L
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUDIO
Wiring Diagram Ð AUDIO Ð (Cont'd)
EL-163

MEL820L
AUDIO
Wiring Diagram Ð AUDIO Ð (Cont'd)
EL-164

MEL821L
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUDIO
Wiring Diagram Ð AUDIO Ð (Cont'd)
EL-165