Lexus RX300 (MCU15). Service manual - part 156

CD Auto Chenger

SOUND JUMPS

19

CD auto chenger faulty.

Does sound jump only during strong vibration?

Is CD auto chenger properly installed?

Functions OK if another CD is played?

Has sudden temperature change occurred inside cabin?

Jumping caused by vibration.

Install properly.

CD faulty.

Formation of condensation due to
temp. changes.

Yes

Yes

Yes

Yes

No

No

No

No

20

CD Auto Chenger

SOUND QUALITY POOR (VOLUME FAINT)

Is radio operating normally?

CD faulty.

Function OK if another CD is played?

Speaker faulty.

Temporarily install another speaker.
Functions OK?

Yes

No

Is speaker property installed?

CD auto chenger faulty.

Install properly.

Yes

Yes

Yes

No

No

No

Radio assembly or CD auto chenger or power amplifier faulty.

–

BODY ELECTRICAL

AUDIO SYSTEM (Except Europe)

BE–171

LEXUS RX300   (RM785E)

CD auto chenger faulty.

Power amplifier faulty.
Recheck system after repair.

Temporarily install another speaker.
Function OK?

21

CD Auto Chenger

ANY SPEAKER DOES NOT WORK

Speaker wire harness faulty.

Speaker faulty.

Is hiss noise produced by non–functioning speaker?

Does continuity exist in speaker wire harness?

Is radio operating normally?

Yes

Yes

Yes

Yes

No

No

No

No

Radio assembly faulty.
Recheck system after repair.

CD auto chenger faulty.

22

CD Auto Chenger

CD MAGAZINE WILL NOT BE EJECTED

Is auto search button of radio
operating normally?

No

Radio assembly
faulty.

Replace fuse.

+B wire harness faulty.

Power amplifier faulty.

Radio assembly faulty.

Check if RADIO No.1 fuse is OK?

No

No

No

Yes

NG

OK

Yes

Yes

Yes

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 CD auto chenger?

BE–172

–

BODY ELECTRICAL

AUDIO SYSTEM (Except Europe)

LEXUS RX300   (RM785E)

23

Power Amplifier

NO POWER COMING IN

+ B wire harness faulty.

GND faulty.

Power amplifier or wire harness faulty.

Power amplifier or wire harness faulty.

GND faulty.

Is tape player operating normally?

Check if RAD–No.2 fuse is OK?

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?

Radio assembly faulty.

Replace fuse.

ACC wire harness faulty.

Radio assembly faulty.

Replace fuse.

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

Is power supplied to ACC terminal of power amplifier?

Is power supplied to +B terminal of power amplifier?

Is power supplied to ACC terminal of radio assembly?

Is power supplied to +B terminal of radio assembly?

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

–

BODY ELECTRICAL

AUDIO SYSTEM (Except Europe)

BE–173

LEXUS RX300   (RM785E)

24

Power Amplifier

POWER COMIMG IN, BUT WOOFER (POWER) AMPLIFIER NOT
OPERATING

+ B wire harness faulty.

GND faulty.

Power amplifier faulty.

Speaker wire harness faulty.

GND faulty.

Is tape player operating normally?

Check if RAD–No.2 fuse is OK?

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?

Radio assembly faulty. Recheck system after repair.

Replace fuse.

ACC wire harness faulty.

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.

Is power supplied to ACC terminal of power amplifier?

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

Is power supplied to +B terminal of power amplifier?

Is power supplied to ACC terminal of radio assembly?

Is power supplied to +B terminal of radio assembly?

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

BE–174

–

BODY ELECTRICAL

AUDIO SYSTEM (Except Europe)

LEXUS RX300   (RM785E)