Lexus SC300 / Lexus SC400. Manual - part 137

(Left Side Motor/Circuit Breaker Operation)
Driver’s Door
(a)  Disconnect the connector from the master switch.
(b) Connect 

the positive (+) lead from the battery to terminal

9 and the negative (–) lead to terminal 10 on the wire
harness side connector and raise the window to full
closed position.

(c)  Continue to apply voltage, check that there is a circuit

breaker operation noise within approximately 4 to 40
seconds.

(d)  Reverse the polarity, check that the window begins to

descend within approximately 60 seconds.

If operation is not as specified, replace the motor.

Passenger ’s Door
(a) Disconnect the connector from the power window

switch.

(b) Connect 

the positive (+) lead from the battery to terminal

2 and the negative (–) lead to terminal 5 on the wire
harness side connector, and raise the window to full
closed position.

(c)  Continue to apply voltage, check that there is a circuit

breaker operation noise within approximately 4 to 40
seconds.

(d)  Reverse the polarity, check that the window begins to

descend within approximately 60 seconds.

If operation is not as specified, replace the motor.

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BODY ELECTRICAL SYSTEM

Power Window Control System

BE–153

(Right 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 clockwise.

(b)  Reverse the polarity, check that the motor turns

counterclockwise.

If operation is not as specified, replace the motor.
(Right Side Door Motor/Circuit Breaker Operation)
See Step of Left Side Motor on page 

BE–153

.

BE–154

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BODY ELECTRICAL SYSTEM

Power Window Control System

(Circuit)
(a)  Disconnect the connector from the motor.
(b)  Connect the connector to the master switch and power

window switch.

(c) Inspect 

the 

connector on the wire harness side as

shown.

Check for

Tester connection

Condition

Specified value

Voltage

1–Ground

Ignition switch ON and

DOWN

Battery positive voltage

g

Ignition switch ON and
master switch position

UP or OFF

No voltage

* Ignition switch ON and

DOWN

Battery positive voltage

* Ignition switch ON and
power window switch

DOWN

Battery  ositive voltage

power window switch

iti

UP or OFF

No voltage

position

UP or OFF

No voltage

2–Ground

Ignition switch ON and

UP

Battery positive voltage

Ignition switch ON and
master switch position

DOWN or OFF

No voltage

* Ignition switch ON and

UP

Battery positive voltage

* Ignition switch ON and
power window switch

UP

Battery  ositive voltage

power window switch

iti

DOWN or OFF

No voltage

position

DOWN or OFF

No voltage

*: Set the window lock switch to the unlock position.

If the circuit is not as specified, refer to 

BE–148

 wiring dia-

gram and inspect the circuits connected to other parts.

(Theft Deterrent and Door Lock Control
ECU)

REMOVAL AND INSTALLATION OF
THEFT DETERRENT AND DOOR LOCK
CONTROL ECU

1.  REMOVE THEFT DETERRENT AND DOOR LOCK

CONTROL ECU
(a)  Remove following parts.

(See page 

BO–112

 and 113)

•

Instrument No. 1 Under Cover.

•

Instrument No. 1 lower finish panel.

(b)  Disconnect the connector and remove the ECU

2.  INSTALL THEFT DETERRENT AND DOOR LOCK

CONTROL ECU
For installation, follow the removal procedure in reverse.

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BODY ELECTRICAL SYSTEM

Power Window Control System

BE–155

INSPECTION OF THEFT DETERRENT
AND DOOR LOCK CONTROL ECU

INSPECT THEFT DETERRENT AND DOOR LOCK CONTROL
ECU

(Circuit)
(a)  Inspect ECU Power Source Circuit.

(See page 

BE–376

)

(b)  Inspect Actuator Power Source Circuit.

(See page 

BE–378

)

(c)  Inspect Ignition Switch Circuit.

(See page 

BE–25

)

(d)  Inspect Door Open Detection Switch Circuit.

(See page 

BE–392

)

If circuit is as specified, inspect ECU operation.
(Operation)
(a)  With the connectors connected, shut all doors.
(b) Check 

that there is 10 V ~ 14 V between terminal B8 and

ground when the ignition switch is turned on.

(c)  After turning the ignition switch off, check within 60

seconds that there is battery voltage between terminal
B8 and ground.

(d) Turn 

the ignition switch on then off, and check that there

is 10 V ~ 14 V between terminal B8 and ground when the
ignition is switched off.

(e)  Open the front door within 60 seconds of turning the

ignition off and check that there is no voltage between
terminal B8 and ground.

(f)  Close all the doors and turn the ignition switch on.
(g)  When a front door is opened, check that there is battery

voltage between terminal B8 and ground.

(h)  Check that there is no voltage between terminal B8 and

ground when the ignition switch is turned to off.

If operation is not as specified, replace the ECU.

BE–156

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BODY ELECTRICAL SYSTEM

Power Window Control System