Lexus GS300/400 (2000 year). Service manual — part 37

BE02C–02

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BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–111

2412

POWER WINDOW CONTROL SYSTEM

TROUBLESHOOTING

1.

WINDOW DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH. (MANUAL OR AU-
TOMATIC OPERATION CAN NOT BE PERFORMED.)

Trouble

Suspect Area (terminal No.)

Parts name

All windows do not operate with master

switch of each window.

PWS terminal of body ECU does not output sig-

nal.

Body ECU PWS terminal (B8) output

Master Switch PW terminal (15) output

Check wire harness between PWS terminal

and PW terminal (15)

Body ECU

Master switch

Windows except driver’s do not operate

with master switch of each window.

Master switch (window lock circuit) faulty

Check continuity between master switch PW

terminal (15) and W/L2 terminal (10)

Check wire harness between W/L2 terminal of

master switch (10) and PCT terminals of each

power window switch.

Master switch

Only specific window does not operate.

(Manual and automatic operation can not

be performed.)

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Only specific window does not operate.

(Automatic operation can not be per-

formed.)

When ”Jam Protection” sensor is defective, auto-

matic function as a fail–safe function might be

unable.

Master switch

Power window switch

Door control ECU

Only specific window does not operate. (Neither manual nor automatic operation is available.)

1

Diagnosis check:

Check output diagnosis trouble codes 21 – 26 when operating the

master switch and power window switch.

(Refer to ”Multiplex Communication System”)

If the door lock of the applicable seat operates.

Wire harness faulty or

D FR DOOR fuse faulty.

No

Yes

Disconnect the driver door control ECU connector.

Yes

No

Voltage check:

With ignition switch ON if 10 to 14 V power is

supplied to PCT (3) of power window switch.

Wire harness faulty.

(Between master switch W/L2 terminal

(10) and power window switch PCT

terminal (3)

Continuity check:

Master switch faulty.

Check continuity master switch and power window switch.

No (Driver side)

No (Except driver side)

Yes

No

Yes

Wire harness check:

Master switch

Master switch

Driver door control ECU

AUTO (7)

DDN (18)

DUP (6)

AUTO (B6)

MDN (B4)

MUP (B5)

Power window switch

Power window switch

Driver door control ECU

A (5)

D (4)

U (6)

AUTO (A22)

MDN (A23)

MUP (A24)

Wire harness faulty.

Continuity check:

Check continuity between UP terminal (A2) and

GND terminal (C12), DN terminal (A11) and

GND terminal (C12) of driver door control ECU .

Yes

When replacing with the normal driver door control ECU

removed from another seat, if it operates normally.

Driver door control ECU faulty.

No

Yes

Driver door control ECU faulty.

No

Power window motor check:

Disconnect the motor connector.

Connect the battery positive (+) lead to terminal

UP (2) and negative (–) lead to terminal DN

(1) of wire harness side motor connector, check that

the motor operates.

Check power window motor.

Yes

No

Wire harness faulty.

Yes

Power window motor faulty.

No

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BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

2413

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BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–113

2414

2.

REMOTE CONTROL OF ALL WINDOWS (EXCEPT DRIVER’S) DOES NOT FUNCTION WITH MAS-
TER SWITCH. (WINDOWS OPERATE NORMALLY WITH EACH OF MASTER SWITCHES.

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 do not op-

erate.)

Driver door control ECU DT1 terminal does not

output.

Driver door control ECU DT1 terminal (B3)

Master switch DT1 terminal (3)

Check wire harness between terminal DT1 (B3)

and DT1 (3)

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 do not op-

erate.)

Driver door control ECU DT2 terminal does not

output.

Driver door control ECU DT2 terminal (B2)

Master switch DT2 terminal (11)

Check wire harness between terminal DT2 (B2)

and DT2 (11)

Driver door control ECU

Master switch

Only rear right side door does not operate.

(Either UP, DOWN or AUTO DOWN does

not operate.)

Master switch faulty

Check continuity of master switch.

Only rear left side door does not operate.

(UP, DOWN and AUTO DOWN do not op-

erate.)

Driver door control ECU DT3 terminal does not

output.

Driver door control ECU DT3 terminal (B1)

Master switch DT3 terminal (14)

Check wire harness between terminal DT3 (B1)

and DT3 (14)

Driver door control ECU

Master switch

Only rear left side door does not operate.

(Either UP, DOWN or AUTO DOWN does

not 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) doors.)

Master switch ON SC2 terminal does not output.

Driver door control ECU SC2 terminal does not

input.

Master switch SC2 terminal (12)

Driver door control ECU SC2 terminal (B10)

Check wire harness between terminal SC2 (12)

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) doors.)

Master switch ON SC1 terminal does not output.

Driver door control ECU SC1 terminal does not

input.

Master switch SC1 terminal (4)

Driver door control ECU SC1 terminal (B9)

Check wire harness between terminal SC1 (4)

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.

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BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

2415

Only AUTO DOWN operation does not

operate.

(All window (Except driver side) doors.)

Master switch ON SC3 terminal does not output.

Driver door control ECU SC3 terminal does not

input.

Master switch SC3 terminal (13)

Driver door control ECU SC3 terminal (B11)

Check wire harness between terminal SC3 (13)

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 with

door key.

Refer to ”POWER DOOR LOCK CONTROL

SYSTEM”.

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Door lock system does not operate with

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.

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