Lexus GS300/400 (2000 year). Manual — part 36
BE0GS–10
I01362
Defogger Wire
Ignition Switch
Defogger Switch
Defogger Switch
Mirror Assembly
Mirror Defogger
LEXUS navigation
System
Passenger Side
Junction Block
DEF M–Fuse
MIR HTR Fuse
Mirror Defogger Relay
Mirror Assembly
Mirror Defogger
Passenger Cowl Side
Relay Block
Defogger Relay
–
BODY ELECTRICAL
DEFOGGER SYSTEM
BE–107
2408
DEFOGGER SYSTEM
LOCATION
BE0GT–03
I04112
6
I04113
I04114
Wire Harness Side
Connector ”A”
Connector ”B”
I01200
2
1
3
5
2
5
1
3
BE–108
–
BODY ELECTRICAL
DEFOGGER SYSTEM
2409
INSPECTION
1.
INSPECT DEFOGGER TIMER OPERATION
(a)
Connect the positive (+) lead from the voltmeter to termi-
nal 6 of body ECU No.1 connector and negative (–) lead
to body ground.
(b)
When the switch is OFF, the voltage should be approx.
12V.
(c)
Turn the defogger switch ON and check that the indicator
lights up and that the voltage is less than 1 V.
(d)
After 15 minutes, check that the switch is OFF and the
voltage is approx. 12 V.
If operation is not as specified, replace the switch.
2.
INSPECT DEFOGGER SWITCH (in PANEL SWITCH)
CIRCUIT
Connector disconnected:
Disconnect the connector from the panel switch and inspect the
connector on wire harness side, as shown in the chart.
Tester connection
Condition
Specified condition
B10 – Ground
Constant
Continuity
A1 – Ground
Constant
Battery voltage
A2 – Ground
Ignition switch LOCK
No voltage
A2 – Ground
Ignition switch ACC or ON
Battery voltage
If the circuit is not as specified, replace the switch.
3.
INSPECT DEFOGGER RELAY CONTINUITY
Condition
Tester connection
Specified condition
Constant
1 – 2
Continuity
Apply B+ between
terminals 1 and 2.
3 – 5
Continuity
If continuity is not as specified, replace the relay.
4.
INSPECT DEFOGGER RELAY CIRCUIT
(See page
I01200
2
1
3
5
2
5
1
3
I01291
Tester Probe
Tin Foil
Heat Wire
I01292
At Center
I01293
0 Volts
Broken
Wire
Several
Volts
Battery
side
Ground side
Foil strip
–
BODY ELECTRICAL
DEFOGGER SYSTEM
BE–109
2410
5.
INSPECT MIRROR DEFOGGER RELAY CONTINUITY
Condition
Tester connection
Specified condition
Constant
1 – 2
Continuity
Apply B+ between
terminals 1 and 2.
3 – 5
Continuity
If continuity is not as specified, replace the relay.
6.
INSPECT MIRROR DEFOGGER RELAY CIRCUIT
(See page
7.
INSPECT DEFOGGER WIRE
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 in-
gredients.
When measuring voltage, wrap a piece of tin foil around the
tip 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.
Voltage
Criteria
Approx. 5V
Okay (No break in wire)
Approx. 10V or 0V
Broken wire
HINT:
If there is approximately 10 V, the wire is broken between 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.
(d)
Place the voltmeter positive (+) lead against the defogger
wire on the battery side.
(e)
Place the voltmeter negative (–) lead with the foil strip
against the wire on the ground side.
(f)
Slide the positive (+) lead from battery to ground side.
(g)
The point where the voltmeter deflects from several V to
zero V is the place where the defogger wire is broken.
HINT:
If the heat wire is not broken, the voltmeter indicates 0 V at the
positive (+) end of the heat wire but gradually increases to about
12 V as the meter probe moves to the other end.
I01294
Repair Point
Broken
Wire
Marking Tape
I01295
I04115
7
8
I04269
12
13
BE–110
–
BODY ELECTRICAL
DEFOGGER SYSTEM
2411
8.
IF NECESSARY, REPAIR DEFOGGER WIRE
(a)
Clean the broken wire tips with grease, wax and silicone
remover.
(b)
Place the masking tape along both sides of the wire for
repair.
(c)
Thoroughly mix the repair agent (Dupont paste No.
4817).
(d)
Using a fine tip brush, apply a small amount of the agent
to the wire.
(e)
After a few minutes, remove the masking tape.
(f)
Do not repair the defogger wire for at least 24 hours.
9.
w/ Mirror heater (w/o Driving position memory):
INSPECT MIRROR DEFOGGER OPERATION
(a)
Connect the positive (+) lead from the battery to terminal
7 and the negative (–) lead to terminal 8.
(b)
Check that the mirror becomes warm.
HINT:
It will take a short time for the mirror to become warm.
10.
w/ Mirror heater (w/ Driving position memory):
INSPECT MIRROR DEFOGGER OPERATION
(a)
Connect the positive (+) lead from the battery to terminal
12 and the negative (–) lead to terminal 13.
(b)
Check that the mirror becomes warm.
HINT:
It will take a short time for the mirror to become warm.
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