Lexus ES300 (1997 year). Manual - part 270

N21545

Glass Printed Antenna

Noise

Signal

Radio

Noise

Noise

Noise

Noise

N21546

to Radio

Battery

Noise

Choke Coil

BE–144

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BODY ELECTRICAL

AUDIO SYSTEM

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1997 LEXUS ES300   (RM511U)

(b)

Matters that require attention when checking:

Noise coming into the radio usually has no harm for
practical use as the noise protection is taken and it
is hardly thinkable for an extremely loud noise to
come in. When extremely loud noise comes into the
radio, check if the grounding is normal where the
antenna is installed.

Check if all the regular noise prevention parts are
properly installed and if there is any installation of
non–authorized  parts and non–authorized wiring.

If you leave the radio under out of tune (not tuning),
it is easy to diagnose the phenomenon as noise oc-
curs frequently.

(c)

Antenna and noise:
Electronic signal received by the antenna will reach to the
radio transmitting through the core wire of the coaxial
cable. Any noise wave other than radio wave is mixed into
this core wire, that naturally causes noise in the radio and
poor sound quality. In order to prevent these noises from
mixing into the radio, the core wire inside the coaxial cable
is covered with a mesh wire called shield wire. This shield
wire shelters the noise and transmits it to the ground, thus
preventing noise from mixing in.

If this shield wire has grounding failure, that causes noise.
(d)

Choke coil and noise:
The choke coil is connected in the rear window defogger
circuit. This is connected so to prevent noise from mixing
into the radio by making the noise current included in the
power source of the rear window defogger flow to the
ground.

N21547

Plug (Main)

Antenna
Terminal (Main)

Plug (Sub)

Antenna
Terminal (Sub)

1

2

3

4

Z19487

Antenna Code

Choke Coil

Ground Point

Center Brace (RH)

Pillar (LH)

Pillar (RH)

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BODY ELECTRICAL

AUDIO SYSTEM

BE–145

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1997 LEXUS ES300   (RM511U)

(e)

Antenna code continuity check and grounding point:

HINT:
During troubleshooting, in case that the antenna code continu-
ity check, grounding check and grounding check of the choke
coil are needed, please check refering to the following illustra-
tion.

Terminal connection

Normal condition

(1) 

↔

 (2)

Continuity

(3) 

↔

 (4)

No continuity

5.

COMPACT DISC PLAYER

Compact Disc (hereafter called ”CD”) Players use a laser beam
pick–up to read the digital signals recorded on the CD and re-
produce analog signals of the music, etc. There are 4.7 in. (12
cm) and 3.2 in. (8 cm) discs in the CD player.
HINT:
Never attempt to disassemble or oil any part of the player unit.
Do not insert any object other than a disc into the magazine.
NOTICE:
CD players use an invisible laser beam which could cause
hazardous radiation exposure. Be sure to operate the play-
er correctly as instructed.

N17398

Example :

Head

Capstan

Pinch Roller

BE4331

BE–146

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BODY ELECTRICAL

AUDIO SYSTEM

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1997 LEXUS ES300   (RM511U)

6.

Tape Player/Head Cleaning:
MAINTENANCE

(a)

Raise the cassette door with your finger.
Next, using a pencil or similar object, push in the guide.

(b)

Using a cleaning pen or cotton applicator soaked in clean-
er, clean the head surface, pinch rollers and capstans.

7.

CD Player/Disc Cleaning:
MAINTENANCE

If the disc gets dirty, clean the disc by wiping the surface from
the center to outside in the radial directions with a soft cloth.
NOTICE:
Do not use a conventional record cleaner or anti–static pre-
servative.

BE061–01

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BODY ELECTRICAL

AUDIO SYSTEM

BE–147

1531

1997 LEXUS ES300   (RM511U)

TROUBLESHOOTING

NOTICE:
When replacing the internal mechanism (computer part) of the audio system, be careful that no part
of your body or clothing comes in contact with the terminals of the leads from the IC, etc. of the re-
placement part (spare part).
HINT:
This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during sys-
tem operation and was prepared on the assumption of system component troubles (except for the wires and
connectors, etc.).
Always inspect the trouble taking the following items into consideration.



Open or short circuit of the wire harness



Connector or terminal connection fault



For audio systems with anti–theft system, troubleshooting items  marked ( * ) indicate that ”Trou-
bleshooting for ANTI–THEFT SYSTEM” should be carried out first.

Problem

No.

Radio

Radio not operating when power switch turned to ’ON’.

1

Display indicates when power switch turned to ’ON’, but no sound (including

’noise’) is produced.

2

Noise present, but AM – FM not operating.

3

Any speaker does not work.

4

Either AM or FM does not work.

5

Few preset turning bands.

5

Reception poor.

6

Sound quality poor.

7

Preset memory disappears.

8

Tape Player

Cassette tape cannot be inserted.

9

Cassette tape inserts, but no power.

10

Power coming in, but tape player not operating.

11

Any speaker does not work.

12

Sound quality poor.

13

Tape jammed, malfunction with tape speed or auto–reverse.

14

Cassette tape will not eject.

15

CD Player

CD cannot be inserted.

16

CD inserted, but no power.

17

Power coming in, but CD player not operating.

18

Sound jumps.

19

Sound quality poor (Volume faint).

20

Any speaker does not work.

21

CD will not be ejected.

22

Noise

Noise occurs

23

Noise produced by vibration or shock while driving.

24

Noise produced when engine starts.

25

The term ”AM” includes LW,MW and SW, and the term ”FW” includes UKW.