1996 TOYOTA T100 radio antenna

Downloaded from www.Manualslib.com manuals search engine IN−14
− INTRODUCTIONFOR ALL OF VEHICLES
14 Author: Date:
1996 TOYOTA T100 (RM449U)
3. IF VEHICLE IS EQUIPPED WITH MOBILE COMMUNICATION SYSTEM
For vehicles with mobile communication systems such as two−way radios and cellular telephones, observe
the following precautions.
(1) Install the antenna as far as possible away from the ECU and sensors of the vehicle’s electronic
system.
(2) Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the ve-
hicle’s electronics systems. For details about ECU and sensors locations, refer to the section on
the applicable component.
(3) Avoid winding the antenna feeder together with the other wiring as much as possible, and also
avoid running the antenna feeder parallel with other wire harnesses.
(4) Confirm that the antenna and feeder are correctly adjusted.
(5) Do not install powerful mobile communications system.

Downloaded from www.Manualslib.com manuals search engine BE2819
Fading
Ionosphere
BE2820
Multipath
BE2821
Fade Out
I03092
Example :
Pinch RollerHead
Capstan
BE−60
− BODY ELECTRICALAUDIO SYSTEM
1860 Author: Date:
1996 TOYOTA T100 (RM449U)
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”, because the reflected indirect signal
(which is off−phase in relation to the direct wave)
sporadically strengthen or weaken the resultant sig-
nal at reception point.
Multipath
One type of interference caused by bouncing of ra-
dio waves off of obstructions is called ”multipath”.
Multipath occurs when a signal from the broadcast
transmitter antenna bounces off buildings, moun-
tains and interference with the signal that is re-
ceived directly.
Fade Out
Because FM radio waves are of higher frequencies
than those of AM, they bounce off buildings, moun-
tains, 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 / Tape head cleaning:
MAINTENANCE OF TAPE PLAYER
Using a moist−type cleaning tape, clean the head surface,
pinch rollers and capstans (Never use ”abrasive” type cas-
sette−shaped cleaner.).

Downloaded from www.Manualslib.com manuals search engine BE27H−01
BE−62
− BODY ELECTRICALAUDIO SYSTEM
1996 TOYOTA T100 (RM449U)
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
For audio systems with anti−theft system, troubleshooting items marked (*) indicate that ”Trou-
bleshooting for ANTI−THEFT SYSTEM” should be carried out first.
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 inserts, 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 eject.*15
AntennaAntenna does not fully extened or fully retract.16
Antenna − related.17
NoiseNoise produced by vibration or shock while driving.18
Noise produced when engine starts.19

Downloaded from www.Manualslib.com manuals search engine 5 RadioEITHER AM OR FM DOES NOT WORK, RECEPTION
POOR (VOLUME FAINT), FEW PRESET TUNING BANDS
R : Radio S : Radio + Tape Player U : Radio − Tape player (Built−in Power Amplifier)
Are both AM and FM defective?
P : Radio − Tape Player (Separate Power Amplifier)
No
Ye sNo
No
No
No
No Ye s
Ye s
Ye s
Ye s
Ye s Problem with radio wave signals or location?Poor signals, poor location.
Adjust antenna trimmer (See page BE−82).
Speaker faulty. Electronic Tuning
Radio type?Radio or radio
assembly faulty.
Which band is poor?
If radio side faulty.
Is tape player operating normally?
Temporarily install another speaker. Functions OK?Radio faulty.
Go to No.17
Radio assembly faulty.
Hissing sound from speaker?
Radio assembly faulty. Recheck system after repair.Power amplifier faulty. Recheck system after repair. P
FM
AM
Radio faulty.
Radio assembly faulty.RSU
RS
U
− BODY ELECTRICALAUDIO SYSTEM
BE−67
1996 TOYOTA T100 (RM449U)

Downloaded from www.Manualslib.com manuals search engine BE1PK−02
− BODY ELECTRICALANTENNA
BE−81
1881 Author: Date:
1996 TOYOTA T100 (RM449U)
ANTENNA
INSPECTION
1. INSPECT ANTENNA MOTOR
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (−) lead to terminal 2.
(b) Check that the motor turns (moves upward).
NOTICE:
These tests must be done quickly (within 3 − 5 seconds) to
prevent the coil from burning out.
(c) Then, reverse the polarity, check that the motor turns the
opposite way (moves downward).
NOTICE:
These tests must be done quickly (within 3 − 5 seconds) to
prevent the coil from burning out.
2. INSPECT ANTENNA MOTOR CONTROL RELAY CIR-
CUIT
Disconnect the connector from the relay and inspect the con-
nector on wire harness side, as shown in the chart below.
Tester connectionConditionSpecified condition
2 − 3ConstantContinuity
6 − GroundConstantContinuity
1 − GroundConstantBattery positive voltage
4 − GroundIgnition switch LOCK or ACCNo voltage
4 − GroundIgnition switch ONBattery positive voltage
5 − GroundIgnition switch LOCKNo voltage
5 − GroundIgnition switch ACC or ONBattery positive voltage
7 − GroundIgnition switch LOCKNo voltage
7 − GroundIgnition switch ACC or ON
(Radio switch and cassette OFF)No voltage
7 − GroundIgnition switch ACC or ON
(Radio switch or cassette ON)Battery positive voltage
8 − GroundIgnition switch LOCKNo voltage
If circuit is as specified, replace the relay.

Downloaded from www.Manualslib.com manuals search engine BE1PL−02
BE4671
Antenna Nut
BE5781
BE5780
BE4674
Twist BE−82
− BODY ELECTRICALANTENNA
1996 TOYOTA T100 (RM449U)
REPLACEMENT
1. REMOVE ANTENNA ROD
HINT:
Perform this operation with negative (−) cable connected to the
battery terminal.
(a) Turn the ignition switch to ”LOCK” position.
(b) Remove the antenna nut.
(c) Press the ”AM” buttons on the radio receiver, and simulta-
neously turn the ignition switch to ”ACC” position.
HINT:
The rod will extend fully and be released from the motor
antenna.
After removing the antenna rod, leave the ignition switch
as ”ACC”.
NOTICE:
To prevent body damage when the antenna rod is released,
hold the rod while it comes out.
2. 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 to-
ward the front of the vehicle.
(b) Wind the cable to retract the rod by turning the ignition
switch to ”LOCK” position.
HINT:
If the ignition switch is already in ”LOCK” position, perform
step 1 (c) first, then turn the ignition switch to ”ACC” posi-
tion.
In case the cable is not wound, twist it as shown in the il-
lustration.
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.