Lexus LS400 (2000 year). Manual — part 32

I04609

Plug (Main)

Antenna
Terminal
(Main)

Plug (Sub)

Antenna
Terminal
(Sub)

1

2

3

4

N17398

Example :

Head

Capstan

Pinch Roller

BE4331

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BODY ELECTRICAL

AUDIO SYSTEM

BE–205

2068

(e)

Antenna code continuity check and grounding point:

HINT:
During troubleshooting, in case that the antenna code continu-
ity check, grounding check and grounding check of the choke
coil are needed, please check referring to the following illustra-
tion.

Terminal connection

Normal condition

(1)

↔

(2)

Continuity

(3)

↔

(4)

No continuity

5.

COMPACT DISC PLAYER

Compact Disc Players use a laser beam pick–up to read the dig-
ital signals recorded on the CD and reproduce analog signals
of the music, etc.
HINT:
Never attempt to disassemble or oil any part of the player unit.
Do not insert any object other than a disc into the magazine.
NOTICE:
CD players use an invisible laser beam which could cause
hazardous radiation exposure. Be sure to operate the play-
er correctly as instructed.

6.

Tape Player/Head Cleaning:
MAINTENANCE

(a)

Raise the cassette door with your finger.
Next, using a pencil or similar object, push in the guide.

(b)

Using a cleaning pen or cotton applicator soaked in clean-
er, clean the head surface, pinch rollers and capstans.

7.

CD Player/Disc Cleaning:
MAINTENANCE

If the disc gets dirty, clean the disc by wiping the surface from
the center to outside in the radial directions with a soft cloth.
NOTICE:
Do not use a conventional record cleaner or anti–static pre-
servative.

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BODY ELECTRICAL

AUDIO SYSTEM

2069

8.

OUTLINE OF AVC–LAN

(a)

What is AVC–LAN?
AVC–LAN is the abbreviation, which stands for Audio Visual Communication–Local Area Network.
This is a unified standard co–developed by 6 audio manufactures associated with Toyota Motor Corpo-
ration.
The Unified standard covers signals, such as audio signal, visual signal, signal for switch indication
and communication signal.

(b)

Objectives
Recently the car audio system has been rapidly developed and functions have been changed drasti-
cally. The conventional system has been switched to the multi–media type such as a navigation sys-
tem. At the same time the level of customers needs to audio system has been heightened. This lies
behind this standardization.
The concrete objectives are explained below.

When products by different manufactures were combined together, there used to be a case
that malfunction occurred such as sound did not come out. This problem has been resolved
by standardization of signals.

Various types of after market products have been able to add or replace freely.

Thanks to the above (2), each manufacture has become able to concentrate on developing
products in their strongest field. This has enabled many types of products provided inex-
pensively.

Conventionally, a new product developed by a manufacture could not be used due to a lack
of compatibility with other manufactures products. Thanks to this new standard, users can
enjoy compatible products provided for them timely.

The above descriptions are the objectives to introduce AVC–LAN. By this standardization, development of
new products will no longer cause systematic errors. Thus, this is very effective standard for a product in the
future.
HINT:

When +B short or GND short is detected in AVC–LAN circuit, communication stops. Accordingly the
audio system does not function normally.

When audio system is not equipped with a navigation system, audio head unit is the master unit.

The car audio system using AVC–LAN circuit has a diagnosis function.

Each product has its own specified numbers called physical address. Numbers are also allotted to
each function in one product, which are called logical address.

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BODY ELECTRICAL

AUDIO SYSTEM

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2070

TROUBLESHOOTING

NOTICE:
When replacing the internal mechanism (computer part) of the audio system, be careful that no part
of your body or clothing comes in contact with the terminals of the leads from the IC, etc. of the re-
placement part (spare part).
HINT:
This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during sys-
tem operation and was prepared on the assumption of system component troubles (except for the wires and
connectors, etc.).
Always inspect the trouble taking the following items into consideration.

Open or short circuit of the wire harness

Connector or terminal connection fault

Problem

No.

Radio

No power coming in.

1

Power coming in, but radio not operating.

2

Noise present, but AM – FM not operating.

3

Either speaker does not work.

4

Either AM or FM does not work.

5

Reception poor (Volume faint).

5

Few preset tuning bands.

5

Sound quality poor.

6

Cannot set station select button.

7

Preset memory disappears.

7

Tape Player

Cassette tape cannot be inserted.

8

Cassette tape inserts, but no power.

9

Power coming in, but tape player not operating.

10

Either speaker does not work.

11

Sound quality poor (Volume faint).

12

Tape jammed, malfunction with tape speed or auto–reverse.

13

Cassette tape will not eject.

14

CD Player

CD cannot be inserted.

15

CD inserts, but no power.

16

Power coming in, but CD player not operating.

17

Sound jumps.

18

Sound quality poor (Volume faint).

19

Either speaker does not work.

20

CD will not eject.

21

Amplifier

No power coming in.

22

Either speaker does not work.

23

Noise

Noise produced by vibration or shock while driving.

24

Noise produced when engine starts.

25

Noise occurs

26

V06272

1

Radio

NO POWER COMING IN

Is tape player operating normally?

Check if RADIO No.2 fuse is OK.

Is ACC applied to radio receiver assembly?

Check if DOME fuse is OK?

Is +B applied to radio receiver assembly?

GND faulty.

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

Radio receiver assembly faulty.

Replace fuse.

ACC wire harness faulty.

Replace fuse.

+B wire harness faulty.

Radio receiver assembly faulty.

No

Yes

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

2

Radio

POWER COMING IN, BUT RADIO NOT OPERATING

Is tape player operating normally?

Is there continuity in speaker wire harness?

Temporarily install another speaker.
Function OK?

Radio receiver assembly faulty.

Speaker wire harness faulty.

Go to No. 23.

Radio receiver
assembly faulty.

speaker faulty.

If radio side faulty

3

Radio

NOISE PRESENT, BUT AM–FM NOT OPERATING

Go to No. 23

Radio receiver assembly faulty.

If radio side faulty

No

No

No

Yes

Yes

Yes

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BODY ELECTRICAL

AUDIO SYSTEM

2071