Audio System(2).pdf

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2002 ACCESSORIES & EQUIPMENT
Audio System - RAV4
BODY ELECTRICAL SYSTEM
PRECAUTION
NOTE:
Take care to observe the following precautions when performing inspections or
removal and replacement of body electrical related parts.
1.
Headlight System
Halogen bulbs have pressurized gas inside and require special handling. They can burst if scratched or
dropped. Hold a bulb only by its plastic or metal case.
Don't touch the glass part of a bulb with bare hands.
2.
SRS (Supplemental Restraint System)
The RAV4 is equipped with an SRS (Supplemental Restraint System) such as the driver airbag and front
passenger airbag, failure to carry out service operation in the correct sequence could cause the SRS to
unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including
removal or installation of parts, inspection or replacement), be sure to read the precautionary notices in
AIR BAG SAFETY PRECAUTIONS
.
3.
Audio System
If the negative (-) terminal cable is disconnected from the battery, the preset AM, FM1 and FM2 stations
stored in memory are erased, so be sure to note the stations and reset them after the battery terminal is
reconnected.
4.
Mobile Communication System
If the vehicle is equipped with a mobile communication system, refer to precautions in
IF VEHICLE IS
EQUIPPED WITH MOBILE COMMUNICATION SYSTEM
.
AUDIO SYSTEM
DESCRIPTION
1.
Radio Wave Band
The radio wave bands used in radio broadcasting are as follows:
Fig. 1: Displaying Radio Wave Band Specifications
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.
Service Area
Fig. 2: Displaying FM & AM Service Area
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 comes 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.
3.
Reception Problems
Besides the static problem, 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.
Fading
Fig. 3: Displaying Fading Interference
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 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".
Multipath
Fig. 4: Displaying Multipath Reception Problems
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Interference caused by bouncing of radio waves off 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 received directly.
Fade out
Fig. 5: Displaying Fade Out Reception Problems
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 obstructions. This is called
"fade out".
4.
Noise Problems
a. Questionnaire for noise:
For noise troubleshooting it is very important to understand the claims from the customers well, so
make the best use of the following questionnaire and diagnose the problem accurately.

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