Lexus SC300 / Lexus SC400. Manual — part 690
DEFOGGER SYSTEM
Description
The component parts of this system and their functions are described in the following table.
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
Parts Name
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Function
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
Defogger
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
When over current flows in the defogger circuit, the Defogger fuse breaks the circuit to pro-
tect it against damage.
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
Defogger Relay
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
This relay is supplied with current from terminal IG1 of ignition switch (Ignition switch
ON) and switches large current from the defogger.
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
A/C Control Panel
Assembly
Defogger Switch
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
The defogger switch is built into the A/C Control Panel Assembly. This switch is
supplied with current from the relay and fuse HTR. Grounds current from the defogger
relay, turning the defogger relay ON.
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
Defogger
Rear Window
Outer Mirror
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
These defoggers generate heat when current is supplied from the defogger relay.
Parts Location
–
BODY ELECTRICAL SYSTEM
Lighting System
BE–51
Wiring and Connector Diagrams
Parts Inspection
(Defogger Switch)
REMOVAL AND INSTALLATION OF AIR
CONDITIONER CONTROL PANEL
ASSEMBLY
(See Instrument Panel on Pub. No. RM260U2, page
BO–111
)
INSPECTION OF DEFOGGER SWITCH
INSPECT SWITCH OPERATION
(a) Connect the positive (+) lead from the battery to terminal A6
and negative (–) lead to terminal A7.
(b) Connect
the
positive (+) lead from the battery to terminal B10
through a 1.4 W test bulb.
BE–52
–
BODY ELECTRICAL SYSTEM
Defogger System
(c) Turn the defogger switch ON and check that the test bulb and
indicator light turn ON, then turn OFF after about 15 minutes.
If operation is not as specified, replace the air conditioner control
panel assembly.
(Defogger Relay)
INSPECTION OF DEFOGGER RELAY
INSPECT RELAY CONTINUITY AND OPERATION
If continuity is not as specified, replace the relay.
(Defogger Wires)
INSPECTION AND REPAIR OF
DEFOGGER WIRES
1.
INSPECT DEFOGGER WIRES
NOTICE:
•
When cleaning the glass, use a soft, dry cloth, and wipe
the glass in the direction of the wire. Take care not to
damage the wires.
•
Do not use detergents or glass cleaners with abrasive
ingredients.
•
When measuring voltage, wind a piece of tin foil around
the top of the negative probe and press the foil against
the wire with your finger as shown.
(a) Turn the ignition switch ON.
(b) Turn the defogger switch ON.
(c) Inspect the voltage at the center of each heat wire as
shown.
ÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑ
Voltage
ÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑ
Criteria
ÑÑÑÑÑÑÑÑÑÑ
Approx. 5 V
ÑÑÑÑÑÑÑÑÑÑ
Okay (No break in wire)
ÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑ
Approx. 10 V or 0 V
ÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑ
Broken wire
HINT: If there is approximately 10 volts, the wire is broken be-
tween the center of the wire and the positive (+) end. If there
is no voltage, the wire is broken between the center of the
wire and ground.
–
BODY ELECTRICAL SYSTEM
Defogger System
BE–53
(d) Place the voltmeter positive (+) lead against the defogger
positive (+) terminal.
(e) Place
the voltmeter negative (–) lead with the foil strip against
the heat wire at the positive (+) terminal end and slide it
toward the negative (–) terminal end.
(f) The point where the voltmeter deflects from zero to several
volts is the place where the heat wire is broken.
HINT: IF the heat wire is not broken, the voltmeter indicates 0 volts
at the positive (+) end of the heat wire but gradually increases to
about 12 volts as the meter probe is moved to the other end.
2.
REPAIR DEFOGGER WIRES
(a) Clean the broken wire tips with a grease, wax and
silicone remover.
(b) Place the masking tape along both sides of the wire to
be repaired.
(c) Thoroughly mix the repair agent (Dupont paste No.
4817).
(d) Using a fine tip brush, apply a small amount to the wire.
(e) After a few minutes, remove the masking tape.
(f) Allow the repair to stand at least 24 hours.
(Mirror Defogger)
REMOVAL AND INSTALLATION OF
MIRROR ASSEMBLY
(See Outside Rear View Mirror on Pub. No. RM260U2, page
BO–42
)
BE–54
–
BODY ELECTRICAL SYSTEM
Defogger System
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст