Nissan Primera P11. Instruction — part 336
YEL887C
REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER
Wiring Diagram — DEF — (Cont’d)
EL-211
Trouble Diagnoses
DIAGNOSTIC PROCEDURE
SYMPTOM: Rear window defogger/door mirror
defogger does not activate, or does not
go off after activating.
CHECK REAR WINDOW DEFOGGER
INPUT SIGNAL.
1. Remove control unit from fuse block
(J/B).
2. Check continuity between control unit
harness terminal
쑗
3
and ground.
OK
왘
NG
Check the following.
●
Rear window defogger
switch
●
Harness for open or short
between control unit and
rear window defogger
switch
●
Rear window defogger
switch ground circuit
1. Turn ignition switch to ON position.
2. Check voltage between control unit termi-
nal
쑗
1
and ground.
Battery voltage should exist.
OK
왘
NG
Check the following.
●
10A fuse [No.
26
, located
in the fuse block (J/B)]
1. Turn ignition switch to ON position.
2. Check voltage between control unit termi-
nal
쑗
13
and ground.
Battery voltage should exist.
OK
왘
NG
Check the following.
●
Rear window defogger
relay
CHECK REAR WINDOW DEFOGGER
OUTPUT SIGNAL.
1. Install control unit to fuse block (J/B).
2. Turn ignition switch to ON POSITION.
3. Check voltage between fuse block (J/B)
harness terminal
1K
and ground.
NG
왘
OK
Check the following.
●
Rear window defogger
filament
(Refer to EL-213.)
CHECK CONTROL UNIT GROUND CIR-
CUIT.
Check continuity between fuse block (J/B)
terminal
1B
and ground.
Continuity should exist.
OK
왘
NG
Check the following.
●
15A fuse [No. 14 , 15 ,
located in the fuse block
(J/B)]
●
Rear window defogger
relay
OK
NG
Repair harness or connectors.
Replace
relay or fuse.
Replace control unit.
Condition
Continuity
Rear window defogger
switch is “OFF”.
No
Rear window defogger
switch is “ON”.
Yes
Condition
Voltage [V]
Rear window defogger
switch is “OFF”.
0
Rear window defogger
switch is “ON”.
Approx. 12
YEL438B
Time control unit connector
YEL439B
Time control unit connector
YEL440B
Time control unit connector
YEL441B
Fuse block (J/B) connector
YEL442B
Super multiple junction (SMJ) connector
왔
왔
왔
왔
왔
왔
왔
REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER
EL-212
Electrical Components Inspection
REAR WINDOW DEFOGGER RELAY
Check continuity between terminals
쑗
3
and
쑗
5
.
Condition
Continuity
12V direct current supply between
terminals
쑗
1
and
쑗
2
Yes
No current supply
No
REAR WINDOW DEFOGGER SWITCH
Check continuity between terminals when rear window defogger
switch is pushed and released.
Terminals
Condition
Continuity
쑗
16
-
쑗
14
Rear window defogger
switch is pushed
Yes
Rear window defogger
switch is released
No
Filament Check
1. Attach probe circuit tester (in volt range) to middle portion of
each filament.
●
When measuring voltage, wrap tin foil around the top of
the negative probe. Then press the foil against the wire
with your finger.
YEL443B
YEL444B
Rear window defogger switch
SEL263
6 volts (normal filament)
SEL122R
Heat wire
Tester probe
Press
Tin foil
REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER
EL-213
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.
Filament Repair
REPAIR EQUIPMENT
1. Conductive silver composition (Dupont No. 4817 or equiva-
lent)
2. Ruler 30 cm (11.8 in) long
3. Drawing pen
4. Heat gun
5. Alcohol
6. Cloth
REPAIRING PROCEDURE
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
silver composition on break with drawing pen. Slightly over-
lap existing heat wire on both sides [preferably 5 mm (0.20
in)] of the break.
SEL265
Burned out point
12 volts
Burned out point
0 volts
SEL266
BE540
Heat wire
5
(0.20)
5
(0.20)
Break
Ruler
Drawing pen
Unit: mm (in)
REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER
Filament Check (Cont’d)
EL-214
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