Lexus GS300/400 (2000 year). Service manual — part 38

The window moves down during the up operation.

2

With ignition switch ON, when performing the auto–up or manual –up

operation, if the factor which increases the sliding resistance of window

glass near the inverse position is recognized.

Disassemble the door and replace or repair the

component.

Reset the limit switch.

If power window regulator and motor operate smoothly.

Yes

No

Check or repair door glass run and window guide

frame.

Replace the driver door control ECU with the normal one

removed from another seat.

Sliding resistance check:

Power window motor reset:

Check operation power window control is normal.

Remove power window regulator assembly.

When raising the assembled window glass by hand if the glass slides

smoothly without being caught.

Yes

Sliding resistance check:

Unit check:

Install power window regulator and reset the limit switch.

Power window motor reset:

Check operation power window control is normal.

Power window motor faulty.

Yes

No

Normal.

(After checking the operation repeatedly, perform the

function check.)

No

Driver door control ECU faulty.

Yes

No

HINT: When difference of descending time comparing

to the opposite window is recognized, there seems to

be an error on sliding components (door glass run

and window regulator.)

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–115

2416

FLOW CHART <B>

BE0HE–10

I01363

Driver side Junction Block

Body ECU No.2

Ignition Switch

Power Window Switch

Power Window Master Switch

Power Window Motor

Power Window Motor

Power Window Switch

Power Window Switch

Passenger side Junction Block

Body ECU No.1

BE–116

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

2417

LOCATION

BE0HF–04

I04116

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–117

2418

INSPECTION

1.

INSPECT POWER WINDOW MASTER SWITCH CON-
TINUITY

Front driver’s dwitch:

Switch position

Tester connection

Specified condition

AUTO

7 – 16

Continuity

UP

6 – 16

Continuity

OFF

–

No continuity

DOWN

16 – 18

Continuity

Front passenger’s switch:

Switch position

Tester connection

Specified condition

AUTO

3 – 13

Continuity

UP

3 – 12

Continuity

OFF

–

No continuity

DOWN

3 – 4

Continuity

Rear left switch:

Switch position

Tester connection

Specified condition

AUTO

13 – 14

Continuity

UP

12 – 14

Continuity

OFF

–

No continuity

DOWN

4 – 14

Continuity

Rear right switch:

Switch position

Tester connection

Specified condition

UP AUTO

11 – 13

Continuity

UP

11 – 12

Continuity

OFF

–

No continuity

DOWN

4 – 11

Continuity

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

INSPECT POWER WINDOW MASTER SWITCH CIR-
CUIT
(See page

DI–866

)

I04117

15

16

2

Unlock

I04118

15

16

2

Lock

BE–118

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

2419

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
15 and the negative (–) lead to terminal 16, and check that
all the illuminations light up.

(c)

Connect the positive (+) lead from the voltmeter to termi-
nal 15 and negative (–) lead to terminal 2, and check that
the voltage meter needle indicates battery positive volt-
age.

(d)

Set the window lock switch to the lock position, check that
all the passenger’s power window switch illuminations go
out.

(e)

Then, check that the voltage meter needle indicates no
voltage.

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