Get BODY ELECTRICAL -> Audio System Guide for Toyota Avensis 4 Door First Generation (1997-2003)

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AUDIO SYSTEM

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DESCRIPTION

1.

RADIO WAVE BAND

The radio wave bands used in radio broadcasting are as follows:

Frequency

Designation

Radio wave

Modulation

30 kHz

300 kHz

3 MHz

30 MHz

300 MHz

LF

LW

MF

AM (MW)

HF

VHF

SW

FM (UKW)

Amplitube modulation

Frequency modulation

LF: Low Frequency

MF: Medium Frequency

HF: High Frequency

VHF: Very High Frequency

2.

SERVICE AREA

There are great differences in the size of the service area for AM

and FM monaural. Sometimes FM stereo broadcasts cannot be

received even through AM can be received in very clearly.

Not only does FM stereo have the smallest service area, but it

also picks up static and other types of interference (”noise”)

easily.

FM(Stereo)

FM(Monaural)

AM

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3.

RECEPTION PROBLEMS

Besides the problem of static, there are also the problems

called ”fading”, ”multipath” and ”fade out”. These problems are

caused not by electrical noise but by the nature of the radio

waves themselves.

(1) Fading

Fading

lonosphere

Besides electrical interference, AM broadcasts are

also susceptible to other types of interference, es-

pecially at night. This is because AM radio waves

bounce off the ionosphere at night. These radio

waves then interfere with the signals from the same

transmitter that reach the vehicle’s antenna directly.

This type of interference is called ”fading”.

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AVENSIS/CORONA SUP (RM781E)

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AUDIO SYSTEM

(2) Multipath

Multipath

One type of interference caused by the bounce of

radio waves off of obstructions is called ”multipath”.

Multipath occurs when a signal from the broadcast

transmitter antenna bounces off buildings and

mountains and interferes with the signal that is re-

ceived directly.

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(3) Fade Out

Fade Out

Because FM radio waves are of higher frequencies

than AM radio waves, they bounce off buildings,

mountains, and other obstructions. For this reason,

FM signals often seem to gradually disappear or

fade away as the vehicle goes behind a building or

other obstruction. This is called ”fade out”.

4.

COMPACT DISC PLAYER

Compact Disc (hereafter called ”CD”) Players use a laser beam

pick–up to read the digital signals recorded on the CD and re-

produce analog signals of the music, etc. There are 4.7 in. (12

cm) and 3.2 in. (8 cm) discs in the CD player.

HINT:

BE2821

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.

5.

Tape Player/Head Cleaning:

MAINTENANCE

Example :

Capstan

Head

(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.

Pinch Roller

N17398

6.

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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AVENSIS/CORONA SUP (RM781E)

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AUDIO SYSTEM

7.

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.

Radio Receiver Assembly

Multi Display

I12412

(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 upgraded. This lies be-

hind this standardization.

The concrete objectives are explained below.

(1) 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 stan-

dardization of signals.

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

(3) Because of 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 inexpensive-

ly.

(4) Conventionally, a new product developed by a manufacture could not be used due to a lack of

compatibility with other manufactures products. Because of 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:

S

When +B short or GND short is detected in AVC–LAN circuit, communication stops. Accordingly the

audio system does not function normally.

S

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

audio system is equipped with a navigation system, navigation ECU 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.

S

AVENSIS/CORONA SUP (RM781E)

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AUDIO SYSTEM

BE1XT–01

TROUBLESHOOTING

1.

DISPLAYING RESULTS

Results for each check are displayed as follows:

S

GOOD:

No DTC is detected for both ”System Check Confirmation” and ”Diagnosis Memory Response”.

NCON:

The Component does not respond to the ”Diagnosis On Instruction” command.

Applicable to only the system where connected components are limited to be used.

ECHN:

Application of new version has been confirmed by the ”Diagnosis On Check”, and there is one

or more DTC which indicates ”Replacement” in the ”System Check Result Response” or ”Diagno-

sis Memory Response”.

S

CHEC:

Application of new version has been confirmed by the ”Diagnosis On Check”, and there is no DTC

which indicates ”Replacement” in the ”System Check Result Response” or ”Diagnosis Memory

Response”, but one or more DTC which indicated ”Check” is identified.

OLD:

Application of old version is confirmed by the ”Diagnosis On Check”, and DTC is identified in the

”System Check Result Response” or ”Diagnosis Memory Response”.

NRES:

S

No response is identified to the ”System Check Start Instruction” and ”Request for System Check

Result” commands.

Example:

TUNE DOWN

TUNE UP

TAPESCD

”1” Switch

”2” Switch

”3” Switch

”5” Switch

”6” Switch

I18196

AVENSIS/CORONA SUP (RM781E)

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AUDIO SYSTEM

2.

FUNCTION

HINT:

S

Check the present and past condition of components by performing the System Check and collecting

stored DTC memories.

S

Check results shall be displayed as one of six following indications: ”GOOD”, ”ECHN”, ”CHEC”

,”NCON”, ”OLD” or ”NRES”.

(a) Display Screen for Service Check.

Example:

Connection parts ( physical address): Multi Display (P160), Radio Receiver (P190), CD changer (P360)

Turn ignition switch ON.

NormalMode

HINT:

Push the ”TAPESCD” switch 3

times while pressing ”ch1” and

”ch6” switches.

To exit from diagnosis mode,

press the ”TAPESCD” switch for

1.7 sec. or turn ignition switch to

ACC or OFF

L 3 beeps

Service Check Mode

Physical Address

(When checking, P160 is blinking.)

P160

TUNE UP

TUNE DOWN

Result (Replacing)

ch2

ch3

”ECHN” Detail

Display Mode

(Refer to (b))

ECHN

TUNE UP

TUNE DOWN

Physical Address

P190

TUNE UP

ch2

”CHEC” Detail

Display Mode

(Refer to (c))

Result (Check)

CHEC

ch3

TUNE UP

TUNE DOWN

P360

OLD

Physical Address

TUNE UP

ch2

”OLD” Detail

Display Mode

(Refer to (d))

Result (Old)

ch3

ch5 (1.7 sec.)

L A long beep (3 sec.)

: Indicates a switch operation

CLr

After 3 sec.

Memory Clear Mode

S After the memory is cleared, only the physical address is displayed cyclically.

S When re–checking (ch1 switch is pressed) in that condition, the result is also

displayed as shown above.

AVENSIS/CORONA SUP (RM781E)

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AUDIO SYSTEM

(b) ”ECHN” Detail Display Mode Screen

P160

TUNE UP

TUNE DOWN

Service Check Mode

TUNE UP

CLr

ECHN

TUNE DOWN

ch5 (Along)

ch2

ch3

”ECHN” Detail Display Mode

Physical Address of Component

TUNE UP

P160

SyS

TUNE DOWN

TUNE UP

Details for 1st

Component

Logical Address

TUNE UP

1–

***

DTC (Refer todiagnostic

trouble code chart)

1–22

TUNE UP

COdE

TUNE UP

Logical Address

TUNE UP

2–

***

DTC (Refer todiagnostic

trouble code chart)

2–E4

TUNE UP

2–

Auxiliary Code

***

Details for 2nd

Component

TUNE DOWN

TUNE UP

2–

Connection Check Code

TUNE UP

**

2–

Number of Occurrence

TUNE UP

**

TUNE DOWN

Continued if more than one DTC is identified.

TUNE DOWN

Detail code is displayed cyclically.

TUNE UP

: Indicates a switch operation

AVENSIS/CORONA SUP (RM781E)

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AUDIO SYSTEM

(c) ”CHEC” Detail Display Mode Screen

P190

TUNE UP

TUNE DOWN

Service Check Mode

TUNE UP

CHEC

CLr

TUNE DOWN

ch5 (Along)

ch3

ch2

”CHEC” Detail Display Mode

Physical Address of Component

TUNE UP

P190

TUNE DOWN

COde

TUNE UP

Logical Address

1–

**

TUNE UP

DTC (Refer to diagnostic

trouble code chart)

1–E4

TUNE DOWN

TUNE UP

Details for 1st

Component

1–P160

Auxiliary Code (*1)

TUNE UP

Connection Check Code

1–

**

TUNE UP

Number of Occurrence (*1)

1–

2–

**

Detailcodeisdisplayedcyclically.

TUNE UP

Logical Address

TUNE UP

DTC (Refer todiagnostic

trouble code chart)

2–DC

TUNE UP

Details for 2nd

Component

2–

**

Auxiliary Code (*1)

TUNE UP

TUNE DOWN

Connection Check Code

2–

**

TUNE UP

2–

Number of Occurrence (*1)

**

(*1): There are some diagnostic

codes witch might not be displayed.

In this case, ”– – –” is displayed.

Continued if more than one DTC is identified.

TUNE DOWN

TUNE UP

: Indicates a switch operation

AVENSIS/CORONA SUP (RM781E)

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AUDIO SYSTEM

(d) ”OLD” Detail Display Mode Screen

P360

TUNE UP

TUNE DOWN

Service Check Mode

TUNE UP

OLD

CLr

TUNE DOWN

ch5 (Along)

ch3

ch2

”CHEC” Detail Display Mode

Physical Address of Component

TUNE UP

P360

TUNE DOWN

COde

TUNE UP

Logical Address

1–

**

TUNE UP

DTC (Refer to diagnostic

trouble code chart)

1–E4

TUNE DOWN

TUNE UP

Details for 1st

Component

1–P160

Auxiliary Code (*1)

TUNE UP

Connection Check Code

1–

**

TUNE UP

Number of Occurrence (*1)

1–

2–

**

Detailcodeisdisplayedcyclically.

TUNE UP

Logical Address

TUNE UP

DTC (Refer todiagnostic

trouble code chart)

2–DC

TUNE UP

Details for 2nd

Component

2–

**

Auxiliary Code (*1)

TUNE UP

TUNE DOWN

Connection Check Code

2–

**

TUNE UP

2–

Number of Occurrence (*1)

**

(*1): There are some diagnostic

codes witch might not be displayed.

In this case, ”– – –” is displayed.

Continued if more than one DTC is identified.

TUNE DOWN

TUNE UP

: Indicates a switch operation

(e) Recheck

(1) Pressing the [ch1] key in Service Check Mode executes recheck.

(2) To display the recheck process, follow the sequence indicated Display Screen for Service Check.

AVENSIS/CORONA SUP (RM781E)

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AUDIO SYSTEM

3.

DIAGNOSIS TROUBLE CODE CHART

Meaning

Terms

Three–digit code (shown in hexadecimal) which is given to each component comprising the

AVC – LAN

Corresponding to the function, individual symbols are specified..

Physical address

Logical address

Two–digitcode (shown in hexadecimal) which is given to each function comprising the inner system

of the AVC – LAN.

Physical address: 160 Multi display

Countermeasure and

inspected parts

DTC

21

Diagnosis content

Logical address

Diagnosis item

ROM Error

Abnormal condition of ROM is de-

tected.

Replace multi–display assembly.

01

(Communication

control)

RAM Error

Abnormal condition of RAM is de-

tected.

Replace multi–display assembly.

01

22

(Communication

control)

D Check harness for power supply

of component shown by auxiliary

code

01 *2

(Communication

Control)

Component shown by auxiliary

code is or was disconnected from

system after engine is started.

D8

No response to

connection

check

D Check harness for communica-

tion system of component shown

by auxiliary code

Component operated (sound and/

or image was provided) before en-

gine stop is or was disconnected

with ignition switch in ACC or ON.

D Check harness for power supply

of component shown by auxiliary

code

D Check harness for communica-

tion system of component shown

by auxiliary code

01 *1

(Communication

Control)

D9

Last Mode

Error

01

DA No Response No response is identified when D Check harness for power supply

(Communication

Control)

to ON/OFF

Instruction

changing mode (audio and visual of component shown by auxiliary

mode change). Detected when code.

sound and picture does not change D Check harness for communica-

by button operation.

tion system of component shown by

auxiliary code.

D If error occurs again, replace

component shown by auxiliary

code.

01 *1

(Communication

Control)

DB Mode Status

Error

Dual sound is detected.

D Check harness for power supply

system of component shown by

auxiliary code.

D Check harness for communica-

tion system of component shown by

auxiliary code.

If same component shown by auxil-

iary code is recorded in other com-

ponent(s), check harness for power

supply and communication system

of components shown sub code.

01 *3

(Communication

Control)

DC Transmission Transmission to component shown

Error

by auxiliary code has been failed.

(This code does not necessarily

mean actual failure.)

AVENSIS/CORONA SUP (RM781E)

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AUDIO SYSTEM

01 *4

(Communication

Control)

DE Slave Reset

(Momentary

After engine start, slave component D Check harness for power supply

has been disconnected and con- system of component shown by

Interruption)

nected again.

auxiliary code.

D Check harness for communica-

tion system of component shown by

auxiliary code.

Since this DTC is provided for engi-

neering, it may be detected when

no actual failure exists.

01

E4

Multiple Frame

Abort

Multiple frame transmission is

aborted.

(Communication

Control)

*1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.

*2: It is stored when 240 sec. has passed after the power supply connector is pulled out after engine start.

*3: It may be stored when the engine key is turned again 1 min. after engine start.

*4: It may be stored when the engine key is turned again after engine start.

AVENSIS/CORONA SUP (RM781E)

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Physical address: 190 Radio receiver assembly

Logical address DTC Diagnosis item

Countermeasure and

inspected parts

Diagnosis content

Replace radio receiver assembly.

01

21 ROM Error

Error is detected in internal ROM.

(Communication

Control)

Replace radio receiver assembly.

01

22 RAM Error

Error is detected in internal RAM.

(Communication

Control)

D Check harness for power supply

system of multi display.

01 *1

(Communication

Control)

Component in which this code is re-

corded has been disconnected from

system with ignition in ACC or ON.

Or, when this code was recorded,

multi–display assembly was discon-

nected.

D6 Absence of

Master

D Check harness for communica-

tion system of multi display.

D Check harness for power supply

system of radio receiver assembly.

D Check harness for communica-

tion system of radio receiver as-

sembly.

01 *4

(Communication

Control)

D7

Connection

Check Error

Component in which this code is re- D Check harness for power supply

corded has been disconnected system of multi display.

from system after engine start.

D Check harness for communica-

Or, when this code was recorded, tion system of multi display.

multi–display assembly was dis-

connected.

D If same auxiliary code is recorded

01 *2

(Communication

Control)

DC Transmission

Error

Transmission to component shown

in other component, check harness

for power supply and communica-

tion system of components shown

sub code.

by auxiliary code has been failed.

(Detecting this DTC does not nec-

essary mean actual failure.)

D If this error occurs frequently, re-

01 *3

(Communication

Control)

DD Master Reset After engine is started, multi–dis-

place multi–display assembly.

(Momentary

Interruption)

play assembly was disconnected

and connected again from system.

Registration

Completion

Instruction

Error

01

E0

E1

”Registration Completion Instruc- D Since this DTC is provided for en-

(Communication

Control)

tion” command from multi display gineering purpose, it may be de-

cannot be received.

tected when no actual failure exists.

D Check harness for power supply

of multi–display assembly.

D Check harness for communica-

tion system of multi–display assem-

bly.

01 *1

(Communication

Control)

Audio

While source equipment is operat-

processor ON ing, AMP output is stopped.

error

D Replace multi–display assembly.

01

E2

E3

ON/OFF

Instruction

Parameter

Error

Error occurs in ON/OFF controlling

command from multi–display as-

sembly.

(Communication

Control)

01

Registration

Request

Transmission

Registration Request command is D Since this DTC is provided for en-

(Communication

Control)

output from slave component.

gineering purpose, it may be de-

tected when no actual failure exists.

AVENSIS/CORONA SUP (RM781E)

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01

E4

Plural Frame

Abort

D Since this DTC is provided for en-

gineering purpose, it may be de-

tected when no actual failure exists.

Plural frame transmission is

aborted.

(Communication

Control)

62

42

44

No Disc

Readout

Inspect CD.

Disc cannot be read.

(CD player)

Replace radio receiver assembly.

62

CD Error

Error is detected in CD player.

(CD player)

62

51

46

EJECT Error

Replace radio receiver assembly.

Inspect CD.

CD cannot be ejected.

(CD player)

62

Scratched/

Reversed Disc

Scratches ordirtisfoundonCDsur-

face or CD is set upside down.

(CD player)

*1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.

*2: It may be stored when the engine key is turned again 1 min. after engine start.

*3: It may be stored when the engine key is turned again after engine start.

*4: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition

switch in ACC or ON, this code is stored.

AVENSIS/CORONA SUP (RM781E)

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BE1XU–01

LOCATION

Steering Switch

Multi–display

Ignition Switch

Instrument Panel Junction Block

D RAD & CIG Fuse

I18197

AVENSIS/CORONA SUP (RM781E)

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BE1XV–01

INSPECTION

INSPECT MULTI–DISPLAY CIRCUIT

Disconnect the connectors from the multi–display, and inspect

the connector on the wire harness side.

I12240

Testerconnection

4 – Ground

Condition

Specifiedcondition

Constant

Ignition switch ON

Continuity

Batteryvoltage

No voltage

7 – Ground

8 – Ground

18 – Ground

Ignition switch LOCK

Constant

Batteryvoltage

No voltage

Ignition switch ACC or ON

Ignition switch LOCK

Batteryvoltage

If the circuit is not as specified, inspect the circuits connected

to other parts.

AVENSIS/CORONA SUP (RM781E)

BODY ELECTRICAL -> Audio System for Your Toyota Avensis 4 Door First Generation (1997-2003)

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