Page 154 of 3115
BE0G9-04
I09910
Antenna
Antenna Motor
View ºAº
View ºAºView ºBº
View ºCºView ºDº Passenger Airbag
Sensor Assembly
RainforcementPiller
Rear Door GlassFront Door Glass
View ºBº
View ºCº
View ºDº
Radio Assembly : Clamp
Radio assembly
Front Door Glass
Quater Window
Glass BE-174
- BODY ELECTRICALANTENNA
2547 Author: Date:
2004 LAND CRUISER (RM1071U)
ANTENNA
LOCATION
Page 155 of 3115
BE0N7-06
BE4671
Antenna Nut
BE5781
BE5780
BE4674
Twist
- BODY ELECTRICALANTENNA
BE-177
2550 Author: Date:
2004 LAND CRUISER (RM1071U)
REPLACEMENT
1. Auto antenna models:
REMOVE ANTENNA ROD
HINT:
Do this operation with the battery negative (-) cable connected
to the battery terminal.
(a) Remove the antenna nut.
(b) Turn the radio switch ºONº position.
(c) Turn the antenna switch to ºUPº.
(d) Catch the antenna rod by hand and turn the radio switch
ºOFFº.
(e) Try again to turn the radio switch ºONº and antenna switch
ºUPº.
(f) Remove antenna rod.
HINT:
The rod will extend fully and be released form the motor anten-
na.
NOTICE:
To prevent body damage when the antenna rod is released,
hold the rod while it comes out.
2. Auto antenna models:
INSTALL ANTENNA ROD
(a) Insert the cable of the rod until it reaches the bottom.
HINT:
When inserting the cable, the teeth on the cable must face
toward the rear of the vehicle.
Insert the antenna approx. 350 mm.
(b) Turn the radio switch to ºOFFº.
HINT:
In case the cable is not wound, twist it, as shown in the
illustration.
Even if the rod has not retracted fully, install the antenna
nut and inspect the antenna rod operation. It will finally re-
tract fully.
(c) Inspect the antenna rod operation by pushing the radio
wave band select buttons.
Page 156 of 3115
BE2E8-01
30 kHz 300 kHz 3 MHz 30 MHz 300 MHz
LF MF HF VHF
AM FM
Frequency modulation Frequency
Designation
Radio wave
Modulation Amplitude modulation
BE2818
FM (Stereo)
FM (Monaural)
AM
BE2819
Fading:lonosphere BE-124
- BODY ELECTRICALAUDIO SYSTEM
2497 Author: Date:
2004 LAND CRUISER (RM1071U)
AUDIO SYSTEM
DESCRIPTION
1. RADIO WAVE BAND
The radio wave bands used in radio broadcasting are as follows:
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 (ºnoiseº)
easily.
3. RECEPTION PROBLEMS
Besides the problem of static, there are also the problems
called ºfadingº, ºmultipathº and ºfade outº. 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 ºfadingº.
Page 157 of 3115
BE2820
Multipath
BE2821
Fade Out
Noise occurs at a specific place. Strong possibility of foreign noise.
There is a possibility that the same program is broadcasted
from different local stations, and that might be listening a
program from other station.
Strong possibility of the beat from a distant broadcasting.
Strong possibility of multipath noise and fading noise caused
by the changes of FM waves. Noise occurs when listening to faint
broadcasting.
Noise occurs only at night.
Noise occurs while driving on a partic-
ular area..
FM AM
HINT:
In the condition of noise occurrence does not meet any of the
above questionnaire, check the problems to ºReception
Problemº on the previous page.
- BODY ELECTRICALAUDIO SYSTEM
BE-125
2498 Author: Date:
2004 LAND CRUISER (RM1071U)
(2) Multipath
One type of interference caused by the bounce of
radio waves off of obstructions is called ºmultipathº.
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 ºfade outº.
4. NOISE PROBLEMS
(a) Questionnaire for nose:
It is very important for noise trouble shooting to have good
understanding of the claims from the customers. Refer to
the following questionnaire to diagnose the problem ac-
curately.
Page 158 of 3115
N17398
Example:
HeadCapstan
Pinch Roller BE-126
- BODY ELECTRICALAUDIO SYSTEM
2499 Author: Date:
2004 LAND CRUISER (RM1071U)
(b) Matters that require attention when checking:
Noise coming into the radio usually has no harm for
daily use as the noise protection is taken, and it is
very rate for an extremely loud noise to come in.
When extremely loud noise comes into the radio,
check if the grounding is normal where the antenna
is installed.
Check if all the regular noise prevention parts are
properly installed, and if there is any installation of
non-authorized parts and non-authorized wiring.
If you leave the radio under out of tune (not turning),
it is easy to diagnose the phenomenon as noise oc-
curs frequently.
(c) Antenna and noise:
Electronic signal received by the antenna will reach to the
radio transmitting through the core wire of the coaxial
cable. Any noise wave other than radio wave is mixed into
this core wire, that naturally causes noise in the radio and
poor sound quality. In order to prevent the noise from
coming into radio, the core wire inside the coaxial cable
is covered with a mesh wire called shield wire which trans-
mits the noise to the ground.
5. COMPACT DISC PLAYER
Compact Disc Players use a laser beam pick-up to read the dig-
ital signals recorded on the CD and reproduce analog signals
of the music, etc.
HINT:
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.
6. Tape player/head cleaning:
MAINTENANCE
(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.
Page 164 of 3115
BE0GD-23
I25523
Cowl SIde J/B RH
RADIO Fuse
TweeterRadio Assembly
Ignition Switch
Engine Room R/B
AMP Fuse
Woofer SpeakersSpeakers
Power Amplifier Steering Pad Switch
RSA
Antenna Assembly
Motor Antenna
Cowl Side J/B LH
ECU IG1 Fuse
IG Fuse
BE-170
- BODY ELECTRICALAUDIO SYSTEM
2543 Author: Date:
2004 LAND CRUISER (RM1071U)
LOCATION
Page 190 of 3115
5 RadioANY AM OR FM DOES NOR WORK
FEW PRESET TUNING BANDS
Problem with radio wave signals or location?
Are both AM and FM defective?Radio assembly faulty.
Go to No.6Is power for the antenna being output from the radio assembly?Poor signals, poor location.
No
Ye s NoYe s
Ye s
No BE-154
- BODY ELECTRICALAUDIO SYSTEM
2527 Author: Date:
2004 LAND CRUISER (RM1071U)
Page 191 of 3115
6RadioPOOR RECEPTION
Is the condition bad in comparison with other vehicles?
Are there any additional installation parts?
(Sun shade film, telephone antenna, etc.)
Check if there is any scratch and breaking of a wire on
the glass antenna and the defogger pattern.
(visual check. tester)
(See page BE-124
)
Is the contact of the plug jack of the radio OK?
Does the condition get better by using the outer
antenna (such as pillar antenna)?
Is the contact of the antenna terminal on the glass
surface and the defogger terminal?
Is the continuity of the antenna cord OK?
Check the grounding of the antenna, antenna cord.
Does the condition get better by replacing the
antenna cord?Take a measure for contact. An electric wave environment is bad.
Does the condition get better if
removing them?
Influence of additional installation parts.
Repair. (See page BE-75)
Check the radio.
Take a measure for contact.
Grounding failure. Replace the antenna cord.
Replace the antenna cord. Ye s
No
Radio assembly faultyYe s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s No
No
NoNo
No
No
No
NG
OK
Ye s
- BODY ELECTRICALAUDIO SYSTEM
BE-155
2528 Author: Date:
2004 LAND CRUISER (RM1071U)
