Lexus SC300 / Lexus SC400. Manual — part 136
Parts Inspection
(Power Window Master Switch)
REMOVAL AND INSTALLATION OF
POWER WINDOW MASTER SWITCH
(See page
INSPECTION OF POWER WINDOW
MASTER SWITCH
INSPECT POWER WINDOW MASTER SWITCH
(Continuity)
Inspect the switch continuity between terminals.
Window operation
Driver’s
Passenger’s
Terminal
Switch position
UP
OFF
DOWN
UP
OFF
DOWN
Window Unlock
Window Lock
If continuity is not as specified, replace the master siwtch.
(Illumination)
(a) Set the window lock switch to the unlock position.
(b) Connect
the positive (+) lead from the battery to terminal
4 and the negative (–) lead to terminal 8, check that all
the illuminations light up.
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BODY ELECTRICAL SYSTEM
Power Window Control System
BE–149
(c) Set the window lock switch to the lock position, check
that all the passenger ’s power window switch
illuminations go out.
If operation is not as specified, replace the master switch.
(One Touch Power Window System/Current of Circuit)
Inspection using an ammeter.
(a) Disconnect the connector from the master switch.
(b) Connect the positive (+) lead from the ammeter to
terminal 9 on the wire harness side connector and the
negative (–) lead to negative terminal of the battery.
(c) Connect
the positive (+) lead from the battery to terminal
10 on the wire harness side connector.
(d) As the window goes down, check that the current flow
is approximately 7 amperes.
(e) Check that the current increases approximately 14.5
amperes or more when the window stops going down.
HINT: The circuit breaker opens some 4–40 seconds after the
window stops going down, so that check must be made be-
fore the circuit breaker operates.
If the operation is as specified, replace the master switch.
Inspection using an ammeter with a current–measuring
probe.
(a) Remove the master switch with connector connected.
(b) Attach a current–measuring probe to terminal 4 of the
wire harness.
(c) Turn the ignition switch ON and set the power window
switch in the down position.
(d) As the window goes down, check that the current flow
is approximately 7 amperes.
(e) Check that the current increases approximately 14.5
amperes or more when the window stops going down.
HINT: The circuit breaker opens some 4–40 seconds after the
window stops going down, so that check must be made be-
fore the circuit breaker operates.
If operation is as specified, replace the master switch.
BE–150
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BODY ELECTRICAL SYSTEM
Power Window Control System
(Switch Circuit)
Disconnect the connector from the master switch and inspect
the connector on the wire harness side as shown.
Check for
Tester connection
Condition
Specified value
Voltage
9–Ground
Ignition switch turned to ON
Battery voltage
Continuity
8–Ground
Constant
Continuity
If the circuit is not as specified, refer to
gram and inspect the circuits connected to other parts.
(Power Window Switch)
REMOVAL AND INSTALLATION OF
POWER WINDOW SWITCH
(See page
INSPECTION OF POWER WINDOW
SWITCH
INSPECT POWER WINDOW SWITCH
(Switch Continuity)
Inspect switch continuity between terminals.
Terminal
Switch
position
UP
OFF
DOWN
If continuity is not as specified, replace the switch.
(Switch Circuit)
Disconnect the connector from the switch and inspect the
connector on the wire harness side as shown.
Check for
Tester connection
Condition
Specified value
Voltage
2–Ground
Ignition switch ON and
DOWN
Battery positive voltage
g
g
master switch position
OFF
No voltage
3–Ground
Ignition switch ON
Battery positive voltage
4–Ground
Ignition switch ON and
UP
Battery positive voltage
g
master switch position
OFF
No voltage
If the circuit is not as specified, refer to
gram and inspect the circuits connected to other parts.
–
BODY ELECTRICAL SYSTEM
Power Window
BE–151
(Power Window Main Relay)
REMOVAL AND INSTALLATION OF
POWER WINDOW MAIN RELAY
(See page
INSPECTION OF POWER WINDOW MAIN
RELAY
INSPECT POWER WINDOW MAIN RELAY
(Continuity)
Inspect relay continuity between terminals.
Terminal
Condition
Constant
Apply battery voltage
to terminals 1 and 2.
If continuity is not as specified, replace the relay.
(Relay Circuit)
(See page
(Power Window Motor)
REMOVAL AND INSTALLATION OF
POWER WINDOW MOTOR
1.
REMOVE POWER WINDOW MOTOR
(a) Remove window regulator.
(See page
)
2.
INSTALL POWER WINDOW MOTOR
For installation follow the removal procedure in reverse.
INSPECTION OF POWER WINDOW
MOTOR
INSPECT POWER WINDOW MOTOR
(Left Side Door Motor/Motor Operation)
(a) Connect
the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 2, check that the
motor turns counterclockwise.
(b) Reverse the polarity, check that the motor turns
clockwise.
If operation is not as specified, replace the motor.
BE–152
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BODY ELECTRICAL SYSTEM
Power Window Control System
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