CD changer TOYOTA SEQUOIA 2001 Service Repair Manual

I28193
AVC±LANStereo Component
Amplifier Assy Radio Receiver Assy
(Resistor 60 to 80 W)
Example : DI±1960
± DIAGNOSTICSAUDIO SYSTEM
2154 Author: Date:
2005 SEQUOIA (RM1146U)
4. OUTLINE OF AVC±LAN
(a) What is AVC±LAN?
AVC±LAN is the abbreviation for Audio Visual Communication±Local Area Network. This is a unified
standard co±developed by 6 audio manufacturers associated with Toyota Motor Corporation.
The unified standard includes signals, such as audio, visual and signals for switch indication and com-
munication.
(b) Objectives
Recently development in car audio systems has been rapid and functions have been changed drasti-
cally. The conventional system has been switched to a multi±media type such as a navigation system.
At the same time customers wants to upgrade their audio systems. This is the factor that lies behind
this standardization.
The concrete objectives are explained below.
(1) When products by different manufacturers were combined together, malfunctions such as sound
failure occurred. This problem can be solved by standardization of signals.
(2) Various types of after market products are available.
(3) In general, a new product developed by a particular manufacturer could not be used due to a
lack of compatibility with other manufacturer's products. By developing this new standard, users
can enjoy a range of compatible products from different manufacturers.
HINT:

When +B short or GND short is detected in the AVC±LAN circuit, communication stops, and the audio
system will not function.

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

The radio receiver assy is equipped with a resistor (60 to 80 W) for communication.

All car audio systems using an AVC±LAN circuit have a diagnostic function.

Each unit has its own specified number called a physical address (three±digit number). Numbers are
also allotted to each function, which are called logical addresses (two±digit number).
5. COMMUNICATION SYSTEM
(a) Components in the audio system communicate with each other through the AVC±LAN. (Radio receiver
with CD changer control function)
(b) When a short circuit or circuit breakdown occurs in the AVC±LAN circuit, the audio system does not
operate normally due to the communication cutoff.

I28736
Main AVC±LAN:
(*1)
(*2, 3)Multi±display
Controller (*2)
Rear Seat Audio
Controller (*3) Radio
Receiver Assy Stereo
Component
Amplifier
Sub AVC±LAN:
(*2)
(*2)
Disc
Player
Controller
(*2) Television
Display Assy (*2)
*1: Separate Type Amplifier
*2: w/ RSE System
*3: w/ RSA System
± DIAGNOSTICSAUDIO SYSTEM
DI±1961
2155 Author: Date:
2005 SEQUOIA (RM1146U)
6. DIAGNOSTIC FUNCTION
(a) The audio system has diagnostic function (The diagnostic result is displayed on the LCD of the radio
receiver assy). (Radio receiver with CD changer control function)
(b) The component code (physical address), or three±digit number (in hexadecimal) is set for each com-
ponent comprising AVC±LAN.
(c) The logical address, or two±digit number (in hexadecimal) is set for each function and component unit
in each component.

± DIAGNOSTICSAUDIO SYSTEM
DI±1983
2177 Author: Date:
2005 SEQUOIA (RM1146U)
Logical address: 01 (Communication control) continued
DTCNameDiagnosisVerificationSee page
E0
*1Registration Completion
Instruction ErrorºRegistration Completion Instructionº command
from master cannot be received.Since this DTC is provided for engi-
neering purposes, it may be de-
tected when no actual failure exists.
±
E2ON/OFF Instruction Parameter
ErrorError occurs in ON/OFF controlling command
from master component.Replace radio receiver assy.±
E3
*1Registration Request Transmis-
sion
Registration Request command is output from
component shown by sub code.
Receiving Connection Check Instruction, Regis-
tration Request command is output from sub±
master component.
Since this DTC is provided for engi-
neering purposes, it may be de-
tected when no actual failure exists.
±
E4
*1Multiple Frame AbortMultiple frame transmission is aborted.
Since this DTC is provided for engi-
neering purposes, it may be de-
tected when no actual failure exists.
±
HINT:

*1: This code may be recorded depending on the battery condition or engine start voltage even if no
failure is detected.
(b) Logical address: 61 (Cassette switch)
DTCNameDiagnosisVerificationSee page
40Mechanical Error of MediaMalfunction due to mechanical failure is identified.
Either that, or cassette tape is cut or entangled.1. Inspect cassette tape.
2. Replace radio receiver assy.±
±
(c) Logical address: 62 (CD player)
DTCNameDiagnosisVerificationSee page
42No Disc ReadoutDisc cannot be read.1. Inspect CD.
2. Replace radio receiver assy.±
±
44CD player ErrorError is detected in CD player.Replace radio receiver assy.±
47Detection of high temperatureHigh temperature is detected in CD player.
With ignition switch off, leave ve-
hicle in cool shaded place for a
while and recheck. After deleting
the DTC memory, if same code de-
tected, replace radio receiver assy.
±
48Detection of excess currentOver current is present in CD player.Replace radio receiver assy.±
(d) Logical address: 63 (In±dash CD changer)
DTCNameDiagnosisVerificationSee page
42No Disc ReadoutDisc cannot be read.1. Inspect CD.
2. Replace radio receiver assy.±
±
44CD player ErrorError is detected in CDDH.Replace radio receiver assy.±
47Detection of high temperatureHigh temperature is detected in CDCH.
With ignition switch off, leave ve-
hicle in cool shaded place for a
while and recheck. After deleting
the DTC memory, if same code de-
tected, replace radio receiver assy.
±
48Detection of excess currentOver current is present in CDCH.Replace radio receiver assy.±

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Type 1: AM´FM radio/cassette player/com-
pact disc player (with compact disc
changer controller)Type 2: AM´FM radio/cassette player/com-
pact disc player with changer
This section describes some of the basic
features on Toyota audio systems. Some
information may not pertain to your sys-
tem.
Your audio system works when the ignition
key is in the ªACCº or ªONº position.
TURNING THE SYSTEM ON AND OFF
Push ªPWR´VOLº to turn the audio system
on and off.
Push ªAMº, ªFMº, ªTAPEº, ªDISCº or
ªLOADº to turn on that function without
pushing ªPWR´VOLº. To turn on the cas-
sette or compact disc player, a cassette
or compact disc must be loaded in the
player.
You can turn on each player by inserting
a cassette tape or compact disc.
You can turn off each player by ejecting
the cassette tape or compact disc. If the
audio system was previously off, then the
entire audio system will be turned off
when you eject the cassette tape or com-
pact disc. If the another function was pre-
viously playing, it will come on again.
SWITCHING BETWEEN FUNCTIONS
Push ªAMº, ªFMº, ªTAPEº, ªDISCº or
ªLOADº if the system is already on but
you want to switch from one function to
another.
ReferenceUsing your audio systemÐ
ÐSome basics

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YOUR COMPACT DISC PLAYER WITH
CHANGER (type 2)
When you insert a disc, push the ªLOADº
button and gently push the disc in with
the label side up. (The player will auto-
matically eject a disc if the label side is
down.) This compact disc player can store
up to six discs. The player will play from
track 1 through the end of the disc. Then
it will play from track 1 of the next disc.
The player is intended for use with 12 cm
(4.7 in.) discs only.
NOTICE

Do not stack up two discs for in-
sertion, or it will cause damage to
the compact disc changer. Insert
only one compact disc into slot at
a ti me.

Never try to disassemble or oil any
part of the compact disc player. Do
not insert anything except a com-
pact disc into the slot.

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Vehicles with rear seat entertainment sys-
temÐ
While the DVD player is in operation, the
chapter or track can be changed by push-
ing the ª
º or ªº side of the switch.
3. ªMODEº switch
Push the ªMODEº switch to select an au-
dio mode. Each push changes the mode
sequentially if the desired mode is ready
to use. The DVD player will be selectable
if a rear seat entertainment system is
installed in your vehicle.
To turn the audio system on, push the
ªMODEº switch.
To turn the audio system off, push and
hold the ªMODEº switch until the system
turns off.The rear seat audio system is designed
for the rear seat passengers to enjoy the
audio sound separately between the front
seats and the rear seats.
The rear seat audio system can be turned
on with the rear audio system controller
even if the front audio system is off.
When the front audio is turned off, the
rear audio system will be turned off simul-
taneously.
The rear passengers can enjoy all the
modes (AM and FM radio, cassette tape
player and compact disc player with
changer) with the rear seat audio system
when a cassette tape and a compact disc
are loaded in the front audio system.
When the same mode is selected on the
front and rear audio systems at the same
time, the system can be operated on the
front audio system.
If the radio mode is selected on the front
and rear audio systems at the same time,
AM and FM modes cannot be changed on
the rear seat audio system.You can enjoy the rear seat entertainment
system with commercial headphone. See
ªÐHeadphone input jacksº on page 234 in
this Section for details.
You can also enjoy the rear seat enter-
tainment system with a wireless head-
phone. The wireless headphone can be
used within rear seat. If the signal be-
comes weak, the headphone will mute.
For details, refer to the manufacturer 's
instructions.
With some wireless headphone generally
available in the market, it may be difficult
to catch sound properly. Toyota recom-
mends the use of Toyota genuine wireless
headphone.
You can purchase a wireless headphone
at a Toyota dealer.
CAUTION
Do not drive with using the head-
phone. Otherwise, you may be hard
to hear the sound from the outside
while using the headphone and may
cause an accident.
Rear seat audio systemÐ

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CONTROLLER FEATURES
1. ª
º and ªº (DISC/CH/PROG) buttons
2. ª
º and ªº (TUNE/TRACK) buttons
3. ªON/SOURCEº button
4. ªOFFº button1. ª
º and ªº (DISC/CH/PROG) but-
tons
Radio
You can scan only the preset stations for
the band of the front audio system. (For
instructions, see ªÐControls and featuresº
on page 211 in this Section.)
To scan the preset stations:
Push the ª
º or ªº (DISC/CH/PROG)
button. The radio will tune in the next
preset station up or down the band. The
station frequency will appear on the dis-
play.
Cassette tape player
Push the ª
º or ªº (DISC/CH/PROG)
button to select the other side of a cas-
sette tape. The display indicates which
side is currently selected. (ª
º indicates
t he top si de, ª
º indicates the bottom
side.)
Auto±reverse feature: After the cassette
player reaches the end of a tape side, it
automatically reverses and begins to play
the other side. This is true whether the
cassette was playing or fast forwarding.Compact disc player with changer
Use these buttons to select a disc you
want to listen to.
Push the ª
º or ªº (DISC/CH/PROG)
button until the number of the disc you
want to listen appears on the display.
2. ª
º and ªº (TUNE/TRACK) buttons
Radio
Push the ª
º or ªº (TUNE/TRACK) but-
ton to tune or seek.
Tuning:
Quickly push and release the ª
º or ªº
(TUNE/TRACK) button. Each time you
push the button, the radio will step up or
down to another frequency. If you push
and hold the button, and the radio will go
into the seek mode.
Seeking:
Push and hold the ª
º or ªº (TUNE/
TRACK) button. The radio will seek up or
down for a station of the nearest frequen-
cy and will stop on reception. Each time
you push the button, the stations will be
searched one after another.

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The rear seat entertainment system is de-
signed for the rear passengers to enjoy
audio and DVD video separately from the
front audio system.
The rear seat entertainment system can
be operated when the ignition key is in
the ªACCº or ªONº position.
The rear passengers can enjoy all modes
(AM and FM radio, cassette tape player,
compact disc player with changer and
DVD player) on the rear seat entertain-
ment system only if a cassette tape and
a compact disc are loaded in the front
audio system.
The rear seat entertainment system can
play DVD video, audio CD, video CD, CD
text, dts±CD or DVD audio only when a
disc is loaded in the DVD player.
You can enjoy videos and sound when
your personal audio system is connected
to the input terminal adapter on the rear
console box. For details, refer to the
manufacturer 's instructions.You can enjoy the rear seat entertainment
system with commercial headphone. See
ªÐHeadphone input jacksº on page 282 in
this Section for details.
You can also enjoy the rear seat enter-
tainment system with a wireless head-
phone. The wireless headphone can be
used within rear seat. If the signal be-
comes weak, the headphone will mute.
For details, refer to the manufacturer 's
instructions.
With some wireless headphone generally
available in the market, it may be difficult
to catch sound properly. Toyota recom-
mends the use of Toyota genuine wireless
headphone.
You can purchase a wireless headphone
at a Toyota dealer.CAUTION
Do not drive with using the head-
phone. Otherwise, you may be hard
to hear the sound from the outside
while using the headphone and may
cause an accident.
Conversational speech on some
DVDs is recorded at a low volume
to emphasize the impact of sound
effects. If you adjust the volume
assuming that the conversations
represent the maximum volume lev-
el that the DVD will play, you may
be startled by louder sound effects
or when you change to a different
audio source. Be sure to adjust the
volume with this in mind.
Make sure the volume is not in-
creased, before you turn on the
headphone.

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When you select a mode, the screen indi-
cates which is selected.
Radio
AM mode:
When you select the AM mode, ªAMº will
appear on the screen.
FM mode:
When you select the FM mode, ªFM1º or
ªFM2º will appear on the screen.
Tape mode
ªTAPEº appears on the screen while this
mode is selected.
Compact disc mode
ªCDº appears on the screen while this
mode is selected.
The screen shows the track, or track and
disc number currently being played.
OPERATING FRONT AUDIO SYSTEM
To operate the front audio system, use
the following switches.
1. ª
º and ªº (DISC/CH/PROG) but-
tons
Radio
You can scan only the preset stations for
the band of the front audio system. (For
instructions, see ªÐControls and featuresº
on page 211 in this Section.)
To scan the preset stations:
Push the ª
º or ªº (DISC/CH/PROG)
button. The radio will tune in the next
preset station up or down the band. The
station frequency will appear on the
screen.Cassette tape player
Push the ª
º or ªº (DISC/CH/PROG)
button to select the other side of a cas-
sette tape. The screen indicates which
side is currently selected. (ª
º indicates
t he top si de, ª
º indicates the bottom
side.)
Auto±reverse feature: After the cassette
player reaches the end of a tape side, it
automatically reverses and begins to play
the other side. This is true whether the
cassette was playing or fast forwarding.
Compact disc player with changer
Use these buttons to select a disc you
want to listen to.
Push the ª
º or ªº (DISC/CH/PROG)
button until the number of the disc you
want to listen appears on the display.

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Special shaped discs
Transparent/translucent discs
Low quality discs
Labeled discs
NOTICE
Do not use special shaped, transpar-
ent/translucent, low quality or labeled
discs such as those shown in the il-
lustrations. The use of such discs
may damage the player or changer, or
it may be impossible to eject the
disc.