Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 202xl dsc40001
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05-1 186
DIAGNOSTICS - AUDIO SYSTEM
AUDIO SYSTEM
05ASA-02
DESCRIPTION
1. RADIO WAVE BAND
The radio wave bands used in radio broadcasting are as follows:
Frequency 30 kHz 300 kHz 3 MHz 30 MHz 300 MHz
Designation LF MF HF VHF
AM FM
Radio wave
Modulation Amplitude modulation Frequency modulation
LF: Low Frequency
MF: Medium Frequency
HF: High Frequency
VHF: Very High Frequency
2. SERVICE AREA
(a) There are great differences in the size of the service area
for AM and FM broadcasting. Sometimes FM stereo
broadcast cannot be received even though AM can be re-
ceived very clearly.
FM (Stereo) FM stereo has the smaller service area, it also picks up
FM (Monaural) static and other types of interference ("noise") easily.
AM
BE2818
3. RECEPTION PROBLEMS
HINT:
Besides the problem of static, there are some move problems called "fading", "multipath" and "fade out".
These problems are caused not by electrical noise but by the nature of the radio waves themselves.
Fading (a) Fading
Ionosphere
Besides electrical interference, AM broadcasts are also
susceptible to other types of interference, especially at
night. This is because AM radio waves bounce off the ion-
osphere at night. These radio waves then interfere with
the signals that reach the vehicle's antenna directly from
the same transmitter. This type of interference is called
"fading".
BE2819
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1369
05-1 187
DIAGNOSTICS - AUDIO SYSTEM
(b) Multipath
Multipath
Interference caused by reflection of radio waves against
obstructions is called "Multipath". Multipath occurs when
radio signals emitted from the broadcast transmitter an-
tenna are reflected against tall buildings or mountains
and interferes with other signals which are to be received
directly.
BE2820
(c) Fade Out
Fade Out
Because FM frequency is higher than that of AM, FM ra-
dio wave tends to be reflected against obstructions such
as tall buildings or mountains. For this reason, FM signals
often seem to gradually disappear or fade away as the ve-
hicle goes behind those obstructions. This phenomenon
is called "fade out".
BE2821
4. NOISE PROBLEMS
(a) It is very important for technicians to understand a customer's claim about the noise clearly. Use the
following table to diagnose the phenomena.
Radio wave Condition in which noise occurs Probable cause
Noise occurs at a specific place. Strong possibility of foreign noise.
Noise occurs when listening to faint broadcasting. The same program may be broadcasted from some local sta-
AM
tions. If the program is the same, one of those may be tuned
in.
Noise occurs only at night. Strong possibility of beat from a distant broadcasting.
FM Noise occurs at a specific place during driving. Strong possibility of multipath noise and fading noise caused
by changes of FM frequency.
HINT:
If the condition where the noise occurs does not meet any of the above, find out the cause based on "Recep-
tion Problems". Refer to the description about Multipath and Fading mentioned previously.
5. COMPACT DISC PLAYER
(a) Compact Disc (hereafter called "CD") Players use a laser beam pick-up to read the digital signals re-
corded on the CD and reproduce analog signals of the music, etc. 4.7 in. (12 cm) and 3.2 in. (8 cm)
discs are available for the CD player.
HINT:
Never attempt to disassemble or apply oil to any part of the player unit. Do not insert any object into the maga-
zine except for a disc.
NOTICE:
CD players use an invisible laser beam which could cause hazardous radiation exposure. Be sure
to operate the player correctly as instructed.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1370
05-1 188
DIAGNOSTICS - AUDIO SYSTEM
6. MAINTENANCE
Example :
Tape Player / Head Cleaning:
Head Capstan
(a) Raise the cassette door with your finger.
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
7. MAINTENANCE
CD Player / Disc Cleaning:
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.
BE4331
8. COMMUNICATION SYSTEM
(a) Components in the audio system communicate each other through AVC-LAN. (Radio receiver with
CD changer control function)
(b) The master component of AVC-LAN is the radio receiver assy with resistance (60 - 80 ), which is
necessary for communication.
(c) When short circuit or circuit breakdown occurs in the AVC-LAN circuit, the audio system does not oper-
ate normally due to the communication cutoff.
9. DIAGNOSIS FUNCTION
(a) The audio system has diagnosis function (The diagnosis 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.
Stereo Component Controller Assy *1
Stereo Component
Radio Receiver Assy Multi-display Controller Sub-assy *2
Amplifier Assy
*1: w/ RSA System
*2: w/ RSE System
I34378
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1371
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