Lexus RX300 (MCU15). Service manual — part 155

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 (Except Europe)

BE–167

LEXUS RX300 (RM785E)

13

Tape Player

SOUND QUALITY POOR (VOLUME FAINT)

Yes

No

Radio assembly faulty.

Cassette tape faulty.

Install properly.

Speaker faulty.

Head dirty.

Yes

No

No

Yes

Yes

No

No

Function OK if different cassette tape inserted?

Is radio operating normally?

Is speaker properly installed?

Temporarily install another speaker.
Function OK?

Radio assembly faulty.

Operates normally after cleaning the heads?

Yes

Function OK if different tape (less than 120 mins.) is inserted?

Operates normally after cleaning the heads?

Radio assembly faulty.

Is there a foreign object inside tape player?

Cassette tape faulty.

Remove foreign object.

Head dirty.

14

TAPE JAMMED MALFUNCTION WITH TAPE SPEED OR AUTO–REVERSE

No

No

No

Yes

Yes

Yes

14

Tape Player

TAPE JAMMED MALFUNCTION WITH TAPE SPEED OR AUTO–REVERSE

BE–168

–

BODY ELECTRICAL

AUDIO SYSTEM (Except Europe)

LEXUS RX300 (RM785E)

15

Tape Player

CASSETTE TAPE WILL NOT BE EJECTED

Radio assembly faulty.

Is tape player operating normally?

Is auto search button of radio operating normally?

Check if RADIO No.1 fuse is OK?

Cassette tape jammed.

Replace fuse.

+B wire harness faulty.

Power amplifier faulty.

Yes

Yes

Yes

Yes

No

No

No

No

NG

OK

Radio assembly faulty.

16

CD Auto Chenger

CD MAGAZINE CANNOT BE INSERTED

Yes

No

Is CD magazine already inserted?

Eject CD magazine.

Radio assembly faulty.

CD auto chenger faulty.

Replace fuse.

+B wire harness faulty.

Check if RADIO No.1 fuse is OK?

Radio assembly faulty.

Is auto search button of radio operating normally?

No

No

Yes

Yes

Yes

No

OK

NG

OK

OK

NG

NG

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

Is power supplied to +B terminal of power amplifier?

Is power supplied to +B terminal of radio receiver?

Is power supplied to +B terminal of power amplifier?

Is power supplied to +B terminal
of CD auto chenger?

Check if GND (wire harness
side) of CD player grounded
normally?

–

BODY ELECTRICAL

AUDIO SYSTEM (Except Europe)

BE–169

LEXUS RX300 (RM785E)

17

CD Auto Chenger

CD MAGAZINE INSERTED, BUT NO POWER

Radio assembly faulty.

Replace fuse.

Check if RADIO No.2 fuse is OK?

Is radio operating normally?

CD auto chenger faulty.

ACC wire harness faulty.

Power amplifier faulty.

Radio assembly faulty.

No

No

No

No

Yes

Yes

Yes

Yes

OK

NG

18

CD Auto Chenger

POWER COMING IN, BUT CD AUTO CHENGER NOT OPERATING

Is CD inserted with correct side up?

Is radio operating normally?

Insert correctly.

CD magazine faulty.

Protective circuit in
operation.

Function OK if different CD magazine inserted?

Has sudden temperature change
occurred inside cabin?

CD auto chenger faulty.

Is temperature inside cabin hot?

Speaker wire harness faulty.

Speaker faulty.

Power amplifier faulty.
Recheck system after repair.

Dose continuity exist in speaker wire harness?

Temporarily install another speaker.
Functions OK?

Hiss noise from speaker?

Radio assembly faulty.
Recheck system after repair.

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

No

No

Formation of
condensation
due to temp. changes.

Is power supplied to ACC terminal of power amplifier?

Is power supplied to ACC terminal of radio assembly?

Is power supplied to ACC
terminal of CD auto chenger?

BE–170

–

BODY ELECTRICAL

AUDIO SYSTEM (Except Europe)

LEXUS RX300 (RM785E)