Lexus GS300/400 (2000 year). Manual - part 61

6

Radio

POOR RECEPTION

Is the condition bad in comparison with other vehicles?

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–190

)

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–190

)

Does the condition get better by replacing
the choke coil?

Does the condition get better by replacing the
antenna cord?

Take a measure for contact.

An electric wave environment is bad.

Does the condition get better if
removing them?

Influence of additional installation parts.

Repair. (See page 

BE–108

)

Check the radio.

Take a measure for contact.

Grounding failure.

Replace the antenna cord.

Replace the choke coil.

Replace 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

Yes

BE–202

–

BODY ELECTRICAL

AUDIO SYSTEM

2503

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?

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.

Radio assembly faulty.

Yes

Yes

Yes

No

No

No

NG

NG

OK

OK

Yes

Check if GND (wire harness side) of power amplifier
grounded normally?

Is power supplied to +B terminal of power amplifier?

Check if GND (wire harness side) of radio assembly
grounded normally?

Is power supplied to +B terminal of radio assembly?

–

BODY ELECTRICAL

AUDIO SYSTEM

BE–203

2504

9

Tape Player

CASSETTE TAPE CANNOT BE INSERTED

Yes

No

NG

Is there a foreign object inside tape player?

Is auto search button radio operating normally?

Check if RADIO No.1 fuse is OK?

Radio assembly faulty.

Radio assembly faulty.

Remove foreign object.

Replace fuse.

+B wire harness faulty.

GND faulty.

Power amplifier faulty.

Power amplifier faulty.

Yes

No

No

OK

Yes

OK

Yes

OK

NG

No

NG

10

Tape Player

CASSETTE TAPE INSERTED, BUT NO POWER

Is radio operating normal?

Check if RAD No.2 fuse is OK?

ACC wire harness faulty.

Check if RADIO No.1 fuse is OK?

Radio assembly faulty.

Replace fuse.

Replace fuse.

+B wire harness faulty.

Power amplifier faulty.

Radio assembly faulty.

No

No

No

No

OK

OK

Yes

Yes

Yes

Yes

NG

NG

Check if GND (wire harness side) of power amplifier
grounded normally?

Is power supplied to +B terminal of power amplifier?

Check if GND (wire harness side) of radio assembly
grounded normally?

Is power supplied to +B terminal of radio assembly?

Is power supplied to +B terminal of radio assembly?

Is power supplied to ACC terminal of power amplifier?

Is power supplied to ACC terminal of radio assembly?

BE–204

–

BODY ELECTRICAL

AUDIO SYSTEM

2505

11

Tape Player

POWER COMING IN, BUT TAPE PLAYER NOT OPERATING

Yes

No

Radio assembly faulty.

Cassette tape faulty.

Speaker wire harness faulty.

Speaker faulty.

Power amplifier faulty.
Recheck system after repair.

Yes

No

No

Yes

Yes

No

No

Function OK if different cassette tape inserted?

Is radio operating normally?

Does continuity exist in speaker wire harness?

Temporarily install another speaker.
Function OK?

Hiss noise from speaker?

Radio assembly faulty.
Recheck system after repair.

Yes

Radio assembly faulty.
Recheck system after repair.

Radio assembly faulty.

No

No

No

Yes

Yes

Yes

Yes

No

Is radio operating normally?

Speaker wire harness faulty.

Speaker faulty.

Is hiss noise produced by non–functioning speaker.

Does continuity exist in speaker wire harness?

Temporarily install another speaker.
Function OK?

Radio assembly or power amplifier faulty.

12

Tape Player

ANY SPEAKER DOES NOT WORK

–

BODY ELECTRICAL

AUDIO SYSTEM

BE–205

2506