Lexus ES300 (1997 year). Manual - part 125

BE05L–03

N21536

29

36

30

N21537

29

36

30

ON

N21538

Wire Harness Side

17 18 19 20 21 22 23 24 25 26 27 28 29

30 31 32 33 34 35 36 37 38 39 40 41 42

N14863

1

2

5

3

3

5

2

1

BE–106

–

BODY ELECTRICAL

DEFOGGER SYSTEM

1490

1997 LEXUS ES300   (RM511U)

INSPECTION

1.

A/C control panel assembly:
INSPECT DEFOGGER SWITCH OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
29 and negative (–) lead to terminal 30.

(b)

Connect the positive (+) lead from the battery to terminal
36 through a 1.4 W test bulb.

(c)

Turn the defogger switch ON and check that the test bulb
and indicator light turn ON, then turn OFF after approx. 15
minutes.

If operation is not as specified, proceed to inspect the A/C con-
trol assembly.
(See page 

AC–105

)

2.

INSPECT DEFOGGER SWITCH CIRCUIT

Disconnect the connector from the switch and inspect the con-
nector on wire harness side.

Tester connection

Condition

Specified condition

30 – Ground

Constant

Continuity

29 – Ground

Ignition switch position ACC or LOCK

No voltage

29 – Ground

Ignition switch position ON

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

3.

INSPECT DEFOGGER RELAY CONTINUITY

Condition

Tester connection

Specified condition

Constant

1 – 2

Continuity

Apply B+ between

terminals 1 and 2.

3 – 5

Continuity

If continuity is not as specified, replace the relay.
4.

INSPECT DEFOGGER RELAY CIRCUIT
(See page 

BE–11

)

N21211

4

6

N21539

1 2 3

4 5 6

h–6–1

Wire Harness Side

BE4029

Tester Probe

Tin Foil

Heat Wire

–

BODY ELECTRICAL

DEFOGGER SYSTEM

BE–107

1491

1997 LEXUS ES300   (RM511U)

5.

INSPECT MIRROR DEFOGGER OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
6 and the negative (–) lead to terminal 4.

(b)

Check that the mirror becomes warm.

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

6.

INSPECT MIRROR DEFOGGER CIRCUIT

Disconnect the connector from the outside mirror and inspect
the connector on the wire harness side.

Tester connection

Condition

Specified condition

4 – Ground

Constant

Continuity

6 – Ground

Ignition switch position ON

(Defogger switch OFF)

No voltage

6 – Ground

Ignition switch position ON

(Defogger switch ON)

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

7.

INSPECT DEFOGGER WIRE

NOTICE:

When cleaning the glass, use a soft, dry cloth, and
wipe the glass in the direction of the wire. Take care
not to damage the wires.

Do not use detergents or glass cleaners with abrasive
ingredients.

When measuring voltage, wind a piece of tin foil
around the top of the negative probe and press the foil
against the wire with your finger, as shown.

(a)

Turn the ignition switch ON.

(b)

Turn the defogger switch ON.

BE0123

At Center

BE0124

Several 
Volts

0 Volt

Broken
Wire

V

BE0150

Masking Tape

Repair Point

Broken
Wire

BE0151

BE–108

–

BODY ELECTRICAL

DEFOGGER SYSTEM

1492

1997 LEXUS ES300   (RM511U)

(c)

Inspect the voltage at the center of each heat wire.

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 voltage increases
to approx. 12 V as the meter probe moves to the other end.

8.

IF NECESSARY, REPAIR DEFOGGER WIRE

(a)

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

(b)

Place the masking tape along both sides of the wire for
repair.

(c)

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

(d)

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

(e)

After a few minutes, remove the masking tape.

(f)

Do not repair the defogger wire for at least 24 hours.

Z19362

Instrument Panel Junction Block

 GAUGE Fuse

 DOOR Fuse

 POWER Fuse

 Power Main Relay

 Integration Relay

Ignition Switch

Power Window
Master Switch

Power Window Switch

Power Window Switch

Power Window Motor

Power Window Motor

BE05M–01

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–109

1493

1997 LEXUS ES300   (RM511U)

POWER WINDOW CONTROL SYSTEM

LOCATION