Lexus LS400 (2000 year). Manual — part 9

BE0123

At Center

BE0124

0 Volt

Several
Volts

Broken
Wire

BE0150

Repair Point

Broken
Wire

Marking Tape

BE0151

BE–118

–

BODY ELECTRICAL

DEFOGGER SYSTEM

1981

(a)

Turn the ignition switch ON.

(b)

Turn the defogger switch ON.

(c)

Inspect the voltage at the center of each heat wire, as
shown.

Voltage

Criteria

Approx. 5V

Okay (No break in wire)

Approx. 10V or 0V

Broken wire

HINT:
If there is approximately 10 V, the wire is broken between the
center of the wire and the positive (+) end. If there is no voltage,
the wire is broken between the center of the wire and ground.
(d)

Place the voltmeter positive (+) lead against the defogger
positive (+) terminal.

(e)

Place the voltmeter negative (–) lead with the foil strip
against the heat wire at the positive (+) terminal end and
slide it toward the negative (–) terminal end.

(f)

The point where the voltmeter deflects from zero to sever-
al V is the place where the heat wire is broken.

HINT:
If the heat wire is not broken, the voltmeter indicates 0 V at the
positive (+) end of the heat wire but gradually increases to about
12 V as the meter probe is moved to the other end.

7.

IF NECESSARY, REPAIR DEFOGGER WIRE

(a)

Clean the broken wire tips with a grease, wax and silicone
remover.

(b)

Place the masking tape along both sides of the wire to be
repaired.

(c)

Thoroughly mix the repair agent (Dupont paste No.4817).

(d)

Using a fine tip brush, apply a small amount to the wire.

(e)

After a few minutes, remove the masking tape.

(f)

Allow the repair to stand at least 24 hours.

N13368

I04604

8

9

–

BODY ELECTRICAL

DEFOGGER SYSTEM

BE–119

1982

8.

INSPECT MIRROR DEFOGGER
w/o Memory:

(a)

Connect the positive (+) lead from the battery to terminal
8 and the negative (–) lead to terminal 7.

(b)

Check that the mirror becomes warm.

HINT:
It will take a short time for the mirror to become warm.

9.

INSPECT MIRROR DEFOGGER
w/ Memory:

(a)

Connect the positive (+) lead from the battery to terminal
9 and the negative (–) lead to terminal 8.

(b)

Check that the mirror becomes warm.

HINT:
It will take a short time for the mirror to become warm.
If mirror does not become warm, replace the mirror assembly.

BE0C9–03

BE–120

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

1983

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.

Body ECU does not PWS terminal output

Body ECU PWS terminal (B16) output

Master Switch PW terminal (10) output

Check wire harness between PWS terminal

and PW terminal (10)

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 (10) and W/L2 terminal (13)

Check wire harness between master switch

W/L2 terminal (13) and each power window

switches PCT terminal (6)

Master switch

Only specific window does not operate.

(Manual and automatic operation can not

be performed.)

FLOW CHART <A>

–

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 code 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
DOOR M–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 (6) to power window switch.

Wire harness faulty.
(Master switch W/L2 terminal (13) –
power window switch PCT terminal (6)

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 (5)

DDN (12)

DUP (4)

AUTO (B6)

MDN (B4)

MUP (B5)

Power window switch

Power window switch

Each door control ECU

A (1)

D (5)

U (2)

AUTO (A22)

MDN (A23)

MUP (A24)

Wire harness faulty.

No

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.

Yes

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

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–121

1984

FLOW CHART <A>