Lexus LS400 (2000 year). Service manual - part 33

V06273

4

Radio

EITHER SPEAKER DOES NOT WORK

Is tape player operating normally?

Is hiss produced by non–functioning speaker?

Check if GND to power amplifier is OK?

Are +B and +B2 applied to power amplifier?

Is AMP applied to power amplifier?

Is there continuity in wire harness? (Radio receiver
to power amplifier)

Is there continuity in speaker wire harness?

Temporarily install another speaker.
Functions OK?

Radio receiver assembly faulty.

Radio receiver assembly faulty.

Radio receiver assembly faulty.

GND fault.

+B and +B2 wire harness faulty.

Check the radio receiver assembly.

Wire harness faulty.

Speaker wire harness faulty.

Speaker faulty.

No

Yes

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

–

BODY ELECTRICAL

AUDIO SYSTEM

BE–209

2072

V03663

5

Radio

EITHER AM OR FM DOES NOT WORK, RECEPTION POOR (VOLUME FAINT),
FEW PRESET TUNING BANDS

6

Radio

SOUND QUALITY POOR

Problem with radio wave signals or location?
(See page 

BE–203

)

Are both AM and FM defective?

Go to No.28

Is tape player operating normally?

Temporarily install another speaker. Functions
OK?

Radio receiver assembly faulty.

Poor signals, poor location.

Radio receiver assembly faulty.

Radio receiver assembly faulty.

Speaker faulty.

Is sound quality always bad?

Is tape player operating normally?

Is speaker properly installed?

Temporarily install another speaker. Functions
OK?

Radio receiver assembly faulty.

Go to step 6–A.

Go to No.28.

Install properly.

Speaker faulty.

Radio receiver
assembly faulty.

If radio side faulty

6–A.

Is sound quality bad in certain areas only?

Radio receiver assembly faulty.

Poor signals, poor location.

No

Yes

No

Yes

Yes

Yes

If radio side faulty

No

No

Yes

No

No

No

Yes

Yes

No

Yes

No

Yes

BE–210

–

BODY ELECTRICAL

AUDIO SYSTEM

2073

V06275

7

Radio

CANNOT SET STATION SELECT BUTTON, PRESET MEMORY DISAPPEARS

8

Tape Player

CASSETTE TAPE CANNOT BE INSERTED

Can cassette tape be inserted in tape player?

GND faulty.

Check if DOME and RADIO No.2 fuses are OK.

Are ACC and +B applied to radio receiver assem-
bly?

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

Radio receiver assembly faulty.

Radio receiver assembly faulty.

Replace fuse.

ACC and +B wire harness faulty.

GND faulty.

Is there a foreign object inside tape player?

Remove foreign object.

Radio receiver assembly faulty.

Is auto search button of radio operating normally?

Check if DOME and RADIO No.2 fuses are OK.

Replace fuse.

Are ACC and +B applied to radio receiver assem-
bly?

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

ACC and +B wire harness faulty.

Radio receiver
assembly faulty.

Yes

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

No

No

Yes

Yes

No

No

Yes

–

BODY ELECTRICAL

AUDIO SYSTEM

BE–211

2074

V06276

9

CASSETTE TAPE INSERTS, BUT NO POWER

Is tape operating normally?

Check if DOME and RADIO No.2 fuses are OK.

Is ACC applied to radio receiver assembly?

ACC wire harness faulty.

Radio receiver assembly faulty.

Replace fuse.

Radio receiver assembly faulty.

Functions OK if different cassette tape inserted?

Is radio operating normally?

Is there continuity in speaker wire harness?

Temporarily install another speaker.
Functions OK?

Radio receiver assembly faulty.

Cassette tape faulty.

Radio receiver assembly faulty.

Speaker wire harness faulty.

Speaker faulty.

No

Yes

Tape Player

Yes

Yes

No

No

10

POWER COMING IN, BUT TAPE PLAYER NOT OPERATING

Tape Player

Yes

Yes

Yes

Yes

No

No

No

No

BE–212

–

BODY ELECTRICAL

AUDIO SYSTEM

2075