Infiniti G20 (P11). Manual — part 337
Trouble Diagnoses
NCEL0075
DIAGNOSTIC PROCEDURE
NCEL0075S01
SYMPTOM: Rear window defogger does not activate, or does
not go off after activating.
1
CHECK REAR WINDOW DEFOGGER OUTPUT SIGNAL
1. Turn ignition switch to ON position.
2. Check voltage between smart entrance control unit harness terminal 2 and ground.
SEL787V
Voltage [V]:
Rear window defogger switch is “OFF”.
Approx. 12
Rear window defogger switch is “ON”.
0
OK or NG
OK
©
Check the following.
I
Rear window defogger relay
(Refer to EL-127.)
I
Rear window defogger circuit
I
Rear window defogger filament
(Refer to EL-127.)
NG
©
GO TO 2.
2
CHECK DEFOGGER RELAY COIL SIDE CIRCUIT
1. Disconnect control unit connector.
2. Turn ignition switch to ON position.
3. Check voltage between smart entrance control unit terminal 2 and ground.
SEL788V
Does battery voltage exist?
Yes
©
GO TO 3.
No
©
Check the following.
I
10A fuse [No. 8, located in the fuse block (J/B)]
I
Rear window defogger relay
I
Harness for open or short between rear window defogger relay and control unit
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
IDX
REAR WINDOW DEFOGGER
Trouble Diagnoses
EL-125
3
CHECK REAR WINDOW DEFOGGER SWITCH INPUT SIGNAL
Check continuity between smart entrance control unit terminal 39 and ground.
SEL737W
Continuity:
Rear window defogger switch is pushed.
Yes
Rear window defogger switch is released.
No
OK or NG
OK
©
GO TO 4.
NG
©
Check the following.
I
Rear window defogger switch
(Refer to EL-127.)
I
Harness for open or short between control unit and rear window defogger switch
I
Rear window defogger switch ground circuit
4
CHECK IGNITION INPUT SIGNAL
Check voltage between smart entrance control unit terminal 33 and ground.
SEL790V
Voltage [V]:
Ignition switch is “ON”.
Approx. 12
Ignition switch is “OFF”.
0
OK or NG
OK
©
GO TO 5.
NG
©
Check the following.
I
10A fuse [No. 8, located in the fuse block (J/B)]
I
Harness for open or short between control unit and fuse
REAR WINDOW DEFOGGER
Trouble Diagnoses (Cont’d)
EL-126
5
CHECK CONTROL UNIT GROUND CIRCUIT
Check continuity between smart entrance control unit terminal 16 and ground.
SEL791V
Does continuity exist?
Yes
©
Replace control unit.
No
©
Repair harness or connectors.
SEC202B
Electrical Components Inspection
NCEL0076
REAR WINDOW DEFOGGER RELAY
NCEL0076S01
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
SEL430TD
REAR WINDOW DEFOGGER SWITCH
NCEL0076S02
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
NCEL0077
1.
Attach probe circuit tester (in volt range) to middle portion of
each filament.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
IDX
REAR WINDOW DEFOGGER
Trouble Diagnoses (Cont’d)
EL-127
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
NCEL0078
REPAIR EQUIPMENT
NCEL0078S01
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
NCEL0078S02
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-128
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