audio TOYOTA RAV4 1996 Service Repair Manual

The radio wave bands used in radio broadcasting are as follows:
Frequency
Designation
Radio wave
Modulation method
LF: Low frequency MF: Medium Frequency HF: High Frequency VHF: Very High FrequencyAmplitude modulationFrequency modulation 30 kHz
300 kHz3 MHz 30 MHz 300 MHz
LF
MFHFVHF
AM FM
BE0JX−01
BE2818
AM FM(Monaural) FM (Stereo)
BE2819
Fadinglonosphere
BE−66
− BODY ELECTRICALAUDIO SYSTEM
1996 RAV4 (RM447U)
AUDIO SYSTEM
DESCRIPTION
1. RADIO WAVE BAND
2. SERVICE AREA
There are great differences in the size of the service area for
AM, FM monaural, and FM stereo broadcasts cannot be re-
ceived even though 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 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:
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”.

BE2820
Multipath
BE2821
Fade Out
N17398
Example
Head Capstan
Pinch Roller
− BODY ELECTRICALAUDIO SYSTEM
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1996 RAV4 (RM447U)
(2) Multipath:
One type of interference caused by the bouncing 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.
(3) 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. Tape Player/Head Cleaning:
MAINTENANCE
(a) Raise the cassette door with your finger.
Then, using a pencil or like object, push in the guide.
(b) Using a cleaning pen or cotton applicator soaked in clean-
er, clean the head surface, punch rollers and capstans.

BE277−01
BE−68
− BODY ELECTRICALAUDIO SYSTEM
1996 RAV4 (RM447U)
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
ProblemNo.
RadioNo 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.6
Preset memory disappears.7
Tape PlayerCassette tape cannot be inserted.8
Cassette tape inserted, 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
APS, SKIP, RPT buttons not operating.14
Cassette tape will not ejected.15
AntennaAntenna−related.16
NoiseNoise produced by vibration or shock while driving.17
Noise produced when engine starts.18

− BODY ELECTRICALAUDIO SYSTEM
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1996 RAV4 (RM447U)

V07430
1 Radio NO POWER COMING IN
Is tape player operating normally?Radio assembly faulty. Ye s
No
Check CIG & RAD fuse is OK?
OKNG
Replace fuse.
Is ACC applied to radio?No
ACC wire harness faulty.
Ye s
Check if GND (wire harness side) to radio is OK?NG
GND wire harness faulty.
OK
Radio assembly faulty.
2Radio POWER COMING ON, BUT RADIO NOT OPERATING
A Antenna w/o Motor
Do speakers pop when the volume switch is turned
to maximum and then the power is switch ON?A
Go to No.23.If radio side
faulty
Radio faulty.
No
Is tape player operating normally?
NoYe s
Is power for the antenna
being output from the radio
or radio assembly?No
Radio assembly
faulty.
Does continuity exist in speaker wire harness?
Ye sNo
Speaker wire harness faulty.Ye s
Go to No.23.
If radio side
faulty
Temporarily install another speaker
Function OK?Ye s
Speaker faulty.Radio assembly
faulty.
Radio assembly faulty.No
BE−70
− BODY ELECTRICALAUDIO SYSTEM
1996 RAV4 (RM447U)

V07431
3
RadioNOISE PRESENT, BUT AM−FM NOT OPERATING
Is power for the antenna being output from the
radio or radio assembly?No
Radio assembly faulty.
Ye s
Go to No.17.
If radio side faulty
Is tape player operating normally?Ye s
No
Hiss noise from speaker?No
Power amplifier faulty. Recheck system after repair.
Ye s
Radio asembly faulty. Recheck system after repair.
4Radio
EITHER SPEAKER DOES NOT WORK
Is tape player operating normally?
NoYe s
Radio assembly faulty.
Is hiss noise produced by non−functioning speaker?
NoYe s
Does continuity exist in speaker wire harness?No
Speaker wire harness faulty.
Ye s
Temporarily install another speaker.
Function OK?Ye s
Speaker faulty.
NoRadio assembly faulty.
Radio assembly faulty.Radio assembly faulty. Radio assembly faulty.
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1996 RAV4 (RM447U)

V07432
5
RadioEITHER AM OR FM DOES NOT WORK, RECEPTION
POOR (VOLUME FAINT), FEW PRESET TUNING BANDS
Problem with radio wave signals or location?Poor signals or poor location. Ye s
No
Are both AM and FM defective?No
Is power for the antenna being output from
the radio assembly?Ye s
Ye s
Go to No.17.
Temporarily install another speaker.
Functions OK?Speaker faulty. Ye s
NoRadio assembly faulty.
No
If radio side faulty.
NoYe s
Is tape player operating normaly?
Radio assembly faulty.
Radio assembly faulty.
BE−72
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1996 RAV4 (RM447U)

V07433
6
RadioSOUND QUALITY POOR
Is sound quality always bad?
Is sound quality bad in
certain areas only? No Yes
Poor signals or poor
location.
No
Go to No.23.
If radio side faulty
Radio assembly faulty.
Is speaker properly installed?No
Install properly.
Ye s
Temporarily install another speaker.
Function OK?Ye s
Speaker faulty.
No
Go to No.17.If radio side faulty
7
RadioCANNOT SET STATION SELECT BUTTON, PRESET
MEMORY DISAPPEARS
Can cassette tape be inserted in tape player?Ye s
Radio assembly faulty.
No
Check if DOME fuse is OK?NG
Replace fuse.
OK
Is +B applied to radio or radio assembly?No
+B wire harness faulty.
Ye s
Check if GND (wire harness side) to
radio assembly is OK?
OKNG
GND faulty.
Radio assembly faulty.Radio assembly faulty.
Radio assembly faulty. Is tape player operating normaly?Ye s
Ye s
No
− BODY ELECTRICALAUDIO SYSTEM
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1996 RAV4 (RM447U)

V07434
8 Tape Player CASSETTE TAPE CANNOT BE INSERTED
Is there a foreign object inside tape player?Remove foreign object. Ye s
No
Is radio operating normally?Ye s
Radio assembly faulty.
No
Check if DOME fuse is OK?NG
Replace fuse.
OK
No
Is +B applied to radio assembly?+B wire harness faulty.
Ye s
Check if GND (wire harness side) to radio assembly
is OK?
OKNG
GND faulty.
Radio assembly faulty.
9 Tape PlayerCASSETTE TAPE INSERTED, BUT NO POWER
Is radio operating normally?Ye s
Radio assembly faulty.
No
Check if CIG & RAD fuse is OK?NG
Replace fuse.
OK
Is ACC applied to radio assembly?No
ACC wire harness faulty.
Ye s
Radio assembly faulty.
BE−74
− BODY ELECTRICALAUDIO SYSTEM
1996 RAV4 (RM447U)

V07435
10
Tape PlayerPOWER COMING IN, BUT TAPE PLAYER NOT
OPERATING
Functions OK if different cassette tape inserted?Ye s
Cassette tape faulty.
No
Is radio operating normally?Ye s
Radio assembly faulty.
No
Does continuity exist in speaker wire harness?No
Speaker wire harness faulty.
Ye s
Temporarily install another speaker.
Functions OK?
NoYe s
Speaker faulty.
Radio assembly faulty.
11
Tape PlayerEITHER SPEAKER DOES NOT WORK
Is radio operating normally?
NoYe s
Radio assembly faulty.
Is hiss noise produced by non−functioning speaker?
NoYe s
Radio assembly faulty.
Does continuity exist in speaker wire harness?No
Speaker wire harness faulty.
Temporarily install another speaker.
Functions OK?OK
Speaker faulty. Ye s
NG
Radio assembly faulty.
− BODY ELECTRICALAUDIO SYSTEM
BE−75
1996 RAV4 (RM447U)