Lexus SC300 / Lexus SC400. Manual — part 212
(Integration Relay)
REMOVAL AND INSTALLATION OF
INTEGRATION RELAY
(See page
INSPECTION OF INTEGRATION RELAY
INSPECT INTEGRATION RELAY
(Relay Circuit/Light Auto Turn Off System)
Remove the relay from junction block and inspect the con-
nectors on the wire harness and junction block side as shown
in the chart.
(USA)
Check for
Tester connection
Condition
Specified value
Continuity
A4–Ground
Passenger’s Courtesy
OFF
No continuity
y
g
y
ON
Continuity
A5–Ground
Ignition Key
Pull off
No continuity
g
y
Put in
Continuity
A6–Ground
Driver’s Courtesy
OFF
No continuity
y
ON
Continuity
A8–Ground
Seat Belt
Unfasten
Continuity
Fasten
No continuity
A10–Ground
Constant
Continuity
B1–Ground
Passenger’s Door
Unlock
Continuity
g
Lock
No continuity
B2–Ground
Driver’s Door
Unlock
Continuity
Lock
No continuity
B3–Ground
Light Control Switch
OFF
No continuity
g
TAIL or HEAD
Continuity
B6–Ground
Light Control Switch
TAIL or OFF
No continuity
g
HEAD
Continuity
Voltage
A1–Ground
Constant
Voltage
g
A2–Ground
Constant
*Voltage
A7–Ground
Ignition Switch
ON
Voltage
g
LOCK or ACC
No voltage
A9–Ground
Ignition Switch
ON
Battery voltage
g
LOCK or ACC
No voltage
A11–Ground
Ignition Switch
ON or ACC
Voltage
g
LOCK
No voltage
* There is resistance because this circuit is grounded through the bulb.
–
BODY ELECTRICAL SYSTEM
Light System
BE–49
(Canada)
Check for
Tester connection
Condition
Specified value
Continuity
A4–Ground
Passenger’s Courtesy
OFF
No continuity
y
g
y
ON
Continuity
A5–Ground
Ignition Key
Pull off
No continuity
g
y
Put in
Continuity
A6–Ground
Driver’s Courtesy
OFF
No continuity
y
ON
Continuity
A8–Ground
Seat Belt
Unfasten
Continuity
Fasten
No continuity
A10–Ground
Constant
Continuity
A12–Ground
Constant
Continuity
B1–Ground
Passenger’s Door
Unlock
Continuity
g
Lock
No continuity
B2–Ground
Parking Brake
Switch Position
OFF (Switch pin
pushed in)
No continuity
ON (Switch pin re-
leased)
Continuity
B3–Ground
Driver’s Door
Unlock
Continuity
Lock
No continuity
B7–Ground
Headlight Dimmer
Switch Position
Low Beam or High
Beam
No continuity
Flash
Continuity
B8–Ground
Headlight Dimmer
Low Beam
No continuity
g
Switch Position
High Beam or Flash
Continuity
B10–Ground
Light Control Switch
OFF
No continuity
g
HEAD or TAIL
Continuity
B12–Ground
Constant
Continuity
B13–Ground
Light Control Switch
OFF or TAIL
No continuity
g
HEAD
Continuity
Voltage
A1–Ground
Constant
Voltage
g
A2–Ground
Constant
*Voltage
A7–Ground
Ignition Switch
ON
Voltage
g
LOCK or ACC
No voltage
A9–Ground
Ignition Switch
ON
*Voltage
g
LOCK or ACC
No voltage
A11–Ground
Ignition Switch
ON or ACC
Voltage
g
LOCK
No voltage
B4–Ground
Engine
STOP
No voltage
g
Running
Voltage
B11–Ground
Constant
Voltage
* There is resistance because this circuit is grounded through the bulb.
If the circuit is as specified, trying replacing the relay with a
new one.
If the circuit is not as specified, refer to
and inspect the circuit connected to other parts.
BE–50
–
BODY ELECTRICAL SYSTEM
Light System
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
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