Lexus LS400 (2000 year). Service manual - part 11

I03422

1

10

2

3

4

5

6

7

8

9

11

12

13

14

BE0CB–02

I03420

10

11

Unlock

BE–126

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

1989

INSPECTION

1.

INSPECT POWER WINDOW MASTER SWITCH CON-
TINUITY
Front Driver’s Switch

Switch position

Tester connection

Specified condition

UP AUTO

4 – 10, 5 – 10

Continuity

UP

4 – 10

Continuity

OFF

–

No continuity

DOWN

10 – 12

Continuity

DOWN AUTO

10 – 12, 5 – 10

Continuity

Front Passenger’s Switch

Switch position

Tester connection

Specified condition

UP AUTO

1 – 8, 1 – 9

Continuity

UP

1 – 8

Continuity

OFF

–

No continuity

DOWN

1 – 7

Continuity

DOWN AUTO

1 – 7, 1 – 9

Continuity

Rear Left Switch

Switch position

Tester connection

Specified condition

UP AUTO

3 – 8, 7 – 9

Continuity

UP

3 – 8

Continuity

OFF

–

No continuity

DOWN

3 – 7

Continuity

DOWN AUTO

3 – 7, 3 – 9

Continuity

Rear Right Switch

Switch position

Tester connection

Specified condition

UP AUTO

2 – 8, 2 – 9

Continuity

UP

2 – 8

Continuity

OFF

–

No continuity

DOWN

2 – 7

Continuity

DOWN AUTO

2 – 7, 2 – 9

Continuity

If continuity is not as specified, replace the master switch.
If continuity is as specified, inspect the master switch circuit.
2.

INSPECT POWER WINDOW MASTER SWITCH CIR-
CUIT (See page 

DI–737

)

3.

INSPECT POWER WINDOW MASTER SWITCH ILLU-
MINATION

(a)

Set the window lock switch to the unlock position.

(b)

Connect the positive (+) lead from the battery to terminal
10 and the negative (–) lead to terminal 11, and check that
all the illuminations light up.

I03421

Lock

11

10

N15981

Wire Harness Side

Driver Door ECU

From Back Side

N15982

Driver Door ECU

From
Back Side

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–127

1990

(c)

Set the window lock switch to the lock position and check
that all the passenger’s power window switch illumina-
tions go out.

If operation is not as specified, replace the master switch.

4.

Using an ammeter:
INSPECT ONE TOUCH POWER WINDOW SYSTEM/
CURRENT OF CIRCUIT

(a)

Disconnect the connector from the driver door ECU.

(b)

Connect the positive (+) lead from the ammeter to termi-
nal 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
18 on the wire harness side connector.

(d)

As the window goes down, check that the current flow is
approximately 7 A.

(e)

Check that the current increases up to approximately
14.5 A or more when the window stops going down.

HINT:
The PTC opens some 4 – 90 seconds after the window stops
going down, so check must be made before the PTC operates.
If the operation is as specified, replace the driver door ECU.

5.

Using an ammeter with a current–measuring probe:
INSPECT ONE TOUCH POWER WINDOW SYSTEM/
CURRENT OF CIRCUIT

(a)

Remove the driver door ECU with connector connected.

(b)

Attach a current–measuring probe to terminal 9 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 A.

(e)

Check that the current increases up to approximately
14.5 A or more when the window stops going down.

HINT:
The PTC opens some 4 – 90 seconds after the window stops
going down, so check must be made before the PTC operates.
If operation is as specified, replace the driver door ECU.

I03423

1

2

3

4

5

6

I03424

1

2

I03425

1

2

I03426

1

2

BE–128

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

1991

6.

Front Passenger’s Door:
INSPECT POWER WINDOW SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

UP AUTO

1 – 6, 2 – 6

Continuity

UP

2 – 6

Continuity

OFF

–

No continuity

DOWN

5 – 6

Continuity

DOWN AUTO

1 – 6, 5 – 6

Continuity

If continuity is not as specified, replace the switch.
If continuity is as specified, inspect the switch circuit.
7.

Front passenger’s door:
INSPECT POWER WINDOW SWITCH CIRCUIT
(See page 

DI–779

)

8.

Rear left door:
INSPECT POWER WINDOW SWITCH CIRCUIT
(See page 

DI–807

)

9.

Rear left door:
INSPECT POWER WINDOW SWITCH CIRCUIT
(See page 

DI–830

)

10.

Driver’s door:
INSPECT POWER WINDOW MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
2 and the negative (–) lead to terminal 1, and check that
the motor turns clockwise.

(b)

Reverse the polarity and check that the motor turns coun-
terclockwise.

If operation is not as specified, replace the motor.
HINT:
Since the jam protection may not work properly be sure to con-
duct procedures described in ”How to Reset Power Window
Motor (Reset switch and pulse switch)” after this inspection.

11.

Front passenger’s:
INSPECT POWER WINDOW MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
2 and the negative (–) lead to terminal 1, and check that
the motor turns clockwise.

I03427

1

2

I03428

1

2

I03429

1

2

I03430

1

2

I03431

1

2

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–129

1992

(b)

Reverse the polarity and check that the motor turns coun-
terclockwise.

If operation is not as specified, replace the motor.
HINT:
Since the jam protection may not work properly be sure to con-
duct procedures described in ”How to Reset Power Window
Motor (Reset switch and pulse switch)” after this inspection.

12.

Rear left side:
INSPECT POWER WINDOW MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 2, and check that
the motor turns clockwise.

(b)

Reverse the polarity and check that the motor turns coun-
terclockwise.

If operation is not as specified, replace the motor.
HINT:
Since the jam protection may not work properly be sure to con-
duct procedures described in ”How to Reset Power Window
Motor (Reset switch and pulse switch)” after this inspection.

13.

Rear right side:
INSPECT POWER WINDOW MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 2, and check that
the motor turns clockwise.

(b)

Reverse the polarity and check that the motor turns coun-
terclockwise.

If operation is not as specified, replace the motor.
HINT:
Since the jam protection may not work properly be sure to con-
duct procedures described in ”How to Reset Power Window
Motor (Reset switch and pulse switch)” after this inspection.