Lexus LS400 (2000 year). Service manual — part 10

BE–122

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BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

1985

2.

REMOVE CONTROL OF ALL WINDOWS (EXCEPT DRIVER’S) DOES NOT FUNCTIONS WITH
MASTER SWITCH. (WINDOWS OPERATE NORMALLY WITH EACH OF MASTER SWITCH.

Trouble

Suspect Area (terminal No.)

Parts name

All windows (except driver’s) do not oper-

ate by remote control.

Fail–safe mode caused by leaving the master

switch ON or short circuit occurred in remote

control control switch of master switch.

Check continuity of master switch.

Master switch

Only passenger’s door does not operate.

(UP, DOWN and AUTO DOWN does not

operate.)

Driver door control ECU DT1 terminal does not

output.

Driver door control ECU DT1 terminal (B3)

Master switch DT1 terminal (1)

Check wire harness between terminal DT1 (B3)

and DT1 (1)

Driver door control ECU

Master switch

Only passenger’s door does not operate.

(Each operation does not operate.)

Master switch faulty

Check continuity of master switch.

Only rear right side door does not operate.

(UP, DOWN and AUTO DOWN does not

operate.)

Driver door control ECU DT2 terminal does not

output.

Driver door control ECU DT2 terminal (B2)

Master switch DT2 terminal (2)

Check wire harness between terminal DT2 (B2)

and DT2 (2)

Driver door control ECU

Master switch

Only rear right side door does not operate.

(Each operate.)

Master switch faulty

Check continuity of master switch.

Only rear left side door does not operate.

(UP, DOWN and AUTO DOWN does not

operate.)

Driver door control ECU DT3 terminal does not

output.

Driver door control ECU DT3 terminal (B1)

Master switch DT3 terminal (3)

Check wire harness between terminal DT3 (B1)

and DT3 (3)

Driver door control ECU

Master switch

Only rear left side door does not operate.

(Each operate.)

Master switch faulty

Check continuity of master switch.

Driver door control ECU

Master switch

Only UP operation does not operate.

(All window (Except driver side) door.)

Master switch ON SC2 terminal does not output.

Driver door control ECU SC2 terminal does not

input.

Master switch SC2 terminal (8)

Driver door control ECU SC2 terminal (B10)

Check wire harness between terminal SC2 (8)

and SC2 (B10)

Driver door control ECU

Master switch

Only UP operation does not operate.

(Only specific window does not operate.)

Master switch faulty

Check continuity of master switch.

Only DOWN operation does not operate.

(All window (Except driver side) door.)

Master switch ON SC1 terminal does not output.

Driver door control ECU SC1 terminal does not

input.

Master switch SC1 terminal (7)

Driver door control ECU SC1 terminal (B9)

Check wire harness between terminal SC1 (7)

and SC1 (B9)

Driver door control ECU

Master switch

Only DOWN operation does not operate.

(Only specific window does not operate.)

Master switch faulty

Check continuity of master switch.

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–123

1986

Only AUTO DOWN operation does not

operate.

(All window (Except driver side) door.)

Master switch ON SC3 terminal does not output.

Driver door control ECU SC3 terminal does not

input.

Master switch SC3 terminal (9)

Driver door control ECU SC3 terminal (B11)

Check wire harness between terminal SC3 (9)

and SC3 (B11)

Driver door control ECU

Master switch

Only AUTO DOWN operation does not

operate.

(Only specific window does not operate.)

Master switch faulty

Check continuity of master switch.

3.

THE KEY RELATED POWER WINDOW OPERATION DOES NOT OPERATE WITH DRIVER SIDE
DOOR KEY CYLINDER. (MASTER SWITCH OPERATION IS NORMAL.)

Trouble

Suspect Area (terminal No.)

Parts name

Door lock system does not operate by

door key.

Refer to ”POWER DOOR LOCK CONTROL

SYSTEM”.

–

Door lock system do operate by door key.

Fail–safe mode caused by error on jam protec-

tion sensor of power window.

(Operation of power window with multi–function

transmitter is prohibited.)

HINT: DTC 31 – 38 output

Refer to ”Multiplex Communication System”.

4.

POWER WINDOW DOES NOT OPERATE WITH MULTI–FUNCTION TRANSMITTER. (WINDOWS
OPERATE NORMALLY WITH MASTER SWITCH.)

Trouble

Suspect Area (terminal No.)

Parts name

Door lock and luggage compartment

opener do not operate with multi–function

transmitter.

Refer to ”WIRELESS DOOR LOCK CONTROL

SYSTEM”.

–

Only luggage compartment opener oper-

ates with multi–function transmitter.

Wireless door lock transmitter faulty.

Check wireless door lock transmitter.

Door lock and luggage compartment

opener operate with multi–function trans-

mitter.

Fail–safe mode caused by error on jam protec-

tion sensor of power window.

(Operation of power window with multi–function

transmitter is prohibited.)

HINT: DTC 31 – 38 output

Refer to ”Multiplex Communication System”.

5.

WINDOW MOVES DOWN WITHOUT BEING ORDERED DURING THE UP OPERATION

Trouble

Suspect Area (terminal No.)

Parts name

After the window is fully closed, it starts to

move down.

Power window motor limit switch wire harness

faulty.

Power window motor reset switch is reset.

Driver door control ECU LMT terminal (B12)

Driver door control ECU

The window moves down during the up

operation.

FLOW CHART <B>

–

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.)

BE–124

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

1987

FLOW CHART <B>

BE0CA–01

I03261

Body ECU

Ignition Switch

Key Unlock Warning Switch

Front Passenger Door
ECU

Power Window Switch

Power Window Master
Switch

Driver Door ECU

Power Window Motor

Power Window Switch

Power Window Motor

Power Window Motor

Power Window Switch

Power Window Motor

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–125

1988

LOCATION