Lexus ES300 (1997 year). Manual - part 136

V08481

2

Radio

DISPLAY INDICATES WHEN POWER SWITCH TURNED TO
”ON”, BUT NO SOUND (INCLUDING ”NOISE”) IS PRODUCED

+ B wire harness faulty.

GND faulty.

Power amplifier faulty.

Speaker wire harness faulty.

GND faulty.

Check if GND (wire harness side) to power amplifier is OK?

Is tape player operating normally?

Check if RAD–No.2 fuse is OK?

Is ACC applied to power amplifier?

Is + B applied to power amplifier?

Yes

NG

No

OK

No

No

No

No

OK

OK

OK

Yes

Yes

Yes

Yes

NG

NG

NG

Check if RAD–No.1 fuse is OK?

Is + B applied to radio assembly?

Radio assembly faulty. Recheck system after repair.

Replace fuse.

ACC wire harness faulty.

Is ACC applied to radio assembly?

Check if GND (wire harness side) to radio assembly is OK?

Radio assembly faulty.

Replace fuse.

Is there continuity in speaker wire harness?

Temporarily install another speaker. Functions OK?

Hiss noise from speaker?

Yes

Yes

No

No

No

Yes

Power amplifier faulty.

Power amplifier faulty.
Recheck system after repair.

Speaker faulty.

BE–150

–

BODY ELECTRICAL

AUDIO SYSTEM

1534

1997 LEXUS ES300   (RM511U)

V08482

Speaker wire harness faulty.

Is tape player operating normally?

Yes

No

Radio assembly faulty.
Recheck system after repair.

Radio assembly faulty.

Temporarily install another speaker? Functions OK?

Power amplifier faulty. Recheck system after repair.

Speaker faulty.

4

Radio

ANY SPEAKER DOSE NOT WORK

5

Radio

EITHER AM OR FM DOES NOR WORK 
FEW PRESET TUNING BANDS

Is hiss noise produced by non–functioning speaker?

Is there continuity in speaker wire harness?

Problem with radio wave signals or location?

Are both AM and FM defective?

Yes

Yes

No

Yes

No

No

3

Radio

NOISE PRESENT, BUT AM–FM NOT OPERATING

Go to No.25

Radio faulty.

If radio side faulty.

Radio assembly faulty.

Go to No.16

Is tape player operating normally?

Radio assembly faulty.

Is power for the antenna being output from the radio assembly?

Hiss noise from speaker?

Temporarily install another speaker. Functions OK?

Radio assembly faulty. Recheck system after repair.

Speaker faulty.

Power amplifier faulty.
Recheck system after repair.

Poor signals, poor location.

No

Yes

Yes

No

No

No

Yes

Yes

Yes

Yes

No

No

–

BODY ELECTRICAL

AUDIO SYSTEM

BE–151

1535

1997 LEXUS ES300   (RM511U)

V08549

6

Radio

POOR RECEPTION

Is the condition bad in comparison with other vehicle?

Are there any additional installation parts?
(Sun shade film, telephone antenna, etc.)

Check if there is any scratch and breaking of a wire on

the glass antenna and the defogger pattern.

(visual check. tester)

(See page 

BE–142

)

Is the contact of the plug jack of the radio OK?

Does the condition get better by using the outer
antenna (such as pillar antenna)?

Is the contact of the antenna terminal on the glass
surface and the defogger terminal?

Is the continuity of the antenna cord OK?

Check the grounding of the antenna, antenna cord,
choke coil, and noise filter. (See page 

BE–142

)

Does the condition get better by exchanging
the choke coil?

Does the condition get better by exchanging the
antenna cord?

Take a measure for contact.

An electric wave environment.

Does the condition get better if removing them?

Influence of additional installation parts.
Influence of the sun shade film.

Repair. (See page 

BE–106

)

Check the radio.

Take a measure for contact.

Grounding failure.

Exchange the antenna cord.

Exchange the choke coil.

Exchange the antenna cord.

Yes

No

Exchange the glass.

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

No

No

No

NG

OK

BE–152

–

BODY ELECTRICAL

AUDIO SYSTEM

1536

1997 LEXUS ES300   (RM511U)

V08483

7

Radio

SOUND QUALITY POOR

Yes

No

Yes

NG

OK

Is sound quality always bad?

Is tape player operating normally?

Poor signals, poor
location.

Radio assembly faulty.

Install properly.

Speaker faulty.

Is tape player operating normally?

Is speaker properly installed?

Radio assembly or power amplifier faulty.
Recheck system after repair.

Temporarily install another speaker. Functions OK?

Is sound quality bad in
certain areas only?

Radio assembly or power
amplifier faulty.

Can cassette tape be inserted in tape player?

Check if RADIO No.1 fuse is OK?

Is +B applied to power amplifier?

Check if GND (wire harness side) to power amplifier?

Is +B applied to radio assembly?

Radio assembly faulty.

Replace fuse.

+B wire harness faulty.

GND faulty.

Power amplifier faulty.

8

Radio

PRESET MEMORY DISAPPEARS

No

Radio assembly faulty.

No

No

No

No

Yes

Yes

Yes

Power amplifier faulty.

Check if GND (wire harness side) to radio assembly?

Radio assembly faulty.

Yes

Yes

Yes

No

No

No

NG

NG

OK

OK

Yes

–

BODY ELECTRICAL

AUDIO SYSTEM

BE–153

1537

1997 LEXUS ES300   (RM511U)