Infiniti QX4 (R50). Manual — part 335
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 Inspection
NBEL0076
REAR WINDOW DEFOGGER RELAY
NBEL0076S01
Check continuity between terminals 3 and 5, 6 and 7.
Condition
Continuity
12V direct current supply between ter-
minals 1 and 2
Yes
No current supply
No
SEL430TB
REAR WINDOW DEFOGGER SWITCH
NBEL0076S02
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
No
SEL263
Filament Check
NBEL0077
1.
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
I
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
NBEL0078
REPAIR EQUIPMENT
NBEL0078S01
1)
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 PROCEDURE
NBEL0078S02
1.
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 Description
NBEL0079
Refer to Owner’s Manual for audio system operating instructions.
Power is supplied at all times
I
through 15A fuse [No. 4, located in the fuse block (J/B)]
I
to audio unit terminal 6,
I
to audio amp. relay terminal 3 and
I
to rear speaker amp. terminal 11.
With the ignition switch in the ACC or ON position, power is supplied
I
through 10A fuse [No. 10, located in the fuse block (J/B)]
I
to audio unit terminal 10.
Ground is supplied through the case of the audio unit.
Ground is supplied
I
to audio amp. relay terminal 2
I
through body grounds M4, M66 and M147
I
to front door speaker LH terminal 5 and
I
to front door speaker RH terminal 5
I
through body grounds M77 and M111
I
to rear speaker amp. terminal 24
I
through body grounds B11, B22 and D210.
When the audio unit POWER button is pressed, power is supplied
I
to rear speaker amp. terminal 9 and
I
to audio amp. relay terminal 1
I
from audio unit terminal 12.
Then audio amp. relay is energized and power is supplied
I
to front door speaker LH terminal 4 and
I
to front door speaker RH terminal 4.
Audio signals are supplied
I
through audio unit terminals 1, 2, 3, 4, 13, 14, 15 and 16
I
to terminals 2 and 6 of the LH and RH front speakers and terminals 5, 7, 18 and 20 of the rear speaker
amp.
I
to LH and RH tweeters through terminals 1 and 3 of the front speakers
I
to rear LH and RH speakers through terminals 1, 2, 25 and 26 of the rear speaker amp.
AUDIO
System Description
EL-160
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