audio TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine IN02H−03
BO4111
Negative Cable
− INTRODUCTIONFOR ALL OF VEHICLES
IN−9
9 Author: Date:
1996 TOYOTA T100 (RM449U)
FOR ALL OF VEHICLES
PRECAUTION
1. FOR VEHICLES EQUIPPED WITH SRS AIRBAG
(a) The TOYOTA T100 is equipped with an SRS (Supple-
mental Restraint System), such as the driver airbag.
Failure to carry out service operations in the correct se-
quence could cause the supplemental restraint system to
unexpectedly deploy during servicing, possibly leading to
a serious accident.
Further, if a mistake is made in servicing the supplemental
restraint system, it is possible the SRS may fail to operate
when required. Before servicing (including removal or
installation of parts, inspection or replacement), be sure
to read the following items carefully, then follow the cor-
rect procedure described in this manual.
(b) GENERAL NOTICE
(1) Malfunction symptoms of the supplemental re-
straint system are difficult to confirm, so the diag-
nostic trouble codes become the most important
source of information when troubleshooting. When
troubleshooting the supplemental restraint system,
always inspect the diagnostic trouble codes before
disconnecting the battery (See page DI−365).
(2) Work must be started after 90 seconds from the
time the ignition switch is turned to the ”LOCK” posi-
tion and the negative (−) terminal cable is discon-
nected from the battery.
(The supplemental restraint system is equipped
with a back−up power source so that if work is
started within 90 seconds of disconnecting the neg-
ative (−) terminal cable from the battery, the SRS
may deploy.)
When the negative (−) terminal cable is discon-
nected from the battery, memory of the clock and
audio systems will be cancelled. So before starting
work, make a record of the contents memorized by
the each memory system. Then when work is fin-
ished, reset the clock and audio systems as before.
To avoid erasing the memory of each memory sys-
tem, never use a back−up power supply from out-
side the vehicle.
(3) Even in cases of a minor collision where the SRS
does not deploy, the steering wheel pad should be
inspected (See page RS−9).

Downloaded from www.Manualslib.com manuals search engine RS03H−01
− SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS−1
1768 Author: Date:
1996 TOYOTA T100 (RM449U)
SRS AIRBAG
PRECAUTION
NOTICE:
The TOYOTA T100 is equipped with SRS, which comprises a driver airbag. Failure to carry out
service operations in the correct sequence could cause the SRS to unexpectedly deploy during
servicing, possibly leading to a serious accident. Further, if a mistake is made in servicing the
SRS, it is possible that the SRS may fail to operate when required. Before performing servicing
(including removal or installation of parts, inspection or replacement), be sure to read the fol-
lowing items carefully, then follow the correct procedures described in the repair manual.
Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most impor-
tant source of information when troubleshooting. When troubleshooting the SRS, always in-
spect the DTCs before disconnecting the battery.
Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, air-
bag sensor assembly and front airbag sensor should be inspected (See page RS−9, RS−23 and
RS−28).
Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
Never disassemble and repair the steering wheel pad, airbag sensor assembly or front airbag
sensor in order to reuse it.
If the steering wheel pad, airbag sensor assembly or front airbag sensor has been dropped, or
if there are cracks, dents or other defects in the case, bracket or connector, replace them with
new ones.
Use a volt/ohmmeter with high impedance ( 10 kΩ/V minimum) for troubleshooting the system’s
electrical circuits.
Information labels are attached to the periphery of the SRS components. Follow the instruc-
tions on the notices.
After work on the SRS is completed, perform the SRS warning light check or SRS side airbag
warning light check (See page DI−365).
If the vehicle is equipped with a mobile communication system, refer to the precaution in the
IN section.
CAUTION:
Work must be started after 90 seconds from when the ignition switch is turned to the ”LOCK”
position and the negative (−) terminal cable is disconnected from the battery.
(The SRS is equipped with a back−up power source so that if work is started within 90 seconds
from disconnecting the negative (−) terminal cable of the battery, the SRS may be deployed.)
When the negative (−) terminal cable is disconnected from the battery, the memory of the clock
and audio system will be canceled. So before starting work, make a record of the contents mem-
orized in the audio memory system. When work is finished, reset the audio systems as they
were before and adjust the clock. To avoid erasing the memory in each memory system, never
use a back− up power supply from outside the vehicle.
Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during
repairs.
Do not expose the steering wheel pad, airbag sensor assembly or front airbag sensor directly
to hot air or flames.

Downloaded from www.Manualslib.com manuals search engine BE – BODY ELECTRICAL

BODY ELECTRICAL SYSTEM BE-1
POWER SOURCE BE-10
IGNITION SWITCH AND KEY UNLOCK
WARNING SWITCH BE-11
HEADLIGHT AND TAILLIGHT SYSTEM BE-14
TURN SIGNAL AND HAZARD
WARNING SYSTEM BE-22
INTERIOR LIGHT SYSTEM BE-24
BACK-UP LIGHT SYSTEM BE-26
STOP LIGHT SYSTEM BE-29
WIPER AND WASHER SYSTEM BE-31
COMBINATION METER BE-35
POWER WINDOW CONTROL SYSTEM BE-46
POWER DOOR LOCK CONTROL
SYSTEM BE-50
POWER MIRROR CONTROL SYSTEM BE-56
AUDIO SYSTEM BE-59
ANTENNA BE-81
CLOCK BE-83

Downloaded from www.Manualslib.com manuals search engine BE01E−07
− BODY ELECTRICALBODY ELECTRICAL SYSTEM
BE−1
1801 Author: Date:
1996 TOYOTA T100 (RM449U)
BODY ELECTRICAL SYSTEM
PRECAUTION
Take care to observe the following precautions when performing inspections or removal and replacement
of body electrical related parts.
1. LIGHTING SYSTEM
Halogen bulbs have pressurized gas inside and require special handling.
They can burst or scatter 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 TOYOTA T100 is equipped with an SRS (Supplemental Restraint System) such as the driver airbag.
Failure to carry out service operations 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 the RS section.
3. AUDIO SYSTEM
If the battery negative (−) terminal is disconnected, the preset AM, FM 1 and FM 2 stations stored in
memory are erased, so be sure to note the stations and reset them after the battery terminal is recon-
nected.
If the battery negative (−) terminal is disconnected, the ”ANTI−THEFT SYSTEM” will operate when the
terminal is reconnected, but the radio, tape player and CD player will not operate. Be sure to input the
correct ID number so that the radio, tape player and CD player can be operated again.
4. MOBILE COMMUNICATION SYSTEM
If the vehicle is equipped with a mobile communication system, refer to precautions in the IN section.

Downloaded from www.Manualslib.com manuals search engine 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
BE1PI−02
BE2818
FM (Stereo)
FM (Monaural)
AM
− BODY ELECTRICALAUDIO SYSTEM
BE−59
1859 Author: Date:
1996 TOYOTA T100 (RM449U)
AUDIO SYSTEM
DESCRIPTION
1. RADIO WAVE BAND
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 though AM comes in very clearly at the same
location.
Not only does FM stereo have the smallest service area, but it
also picks up static and other types of interference (”noise”)
easily if the vehicle is moving in a fringe area.
3. RECEPTION PROBLEMS
Besides the problem by 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 propagations.

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 BE2826
Cassette Tape Slot Cover
− BODY ELECTRICALAUDIO SYSTEM
BE−61
1861 Author: Date:
1996 TOYOTA T100 (RM449U)
5. ANTI−THEFT SYSTEM
HINT:
The words ”ANTI−THEFT SYSTEM” are displayed on the cas-
sette tape slot cover.
For operation instructions for the anti−theft system, please con-
sult the audio system section in the Owner’s Manual (hereafter
called O/M).
(a) Setting system
The system is in operation once the customer has pushed
the required buttons and entered the customer−selected
3−digit ID number.
(Refer to the O/M section, ”Setting the anti−theft system”)
HINT:
When the audio system is shipped the ID number has not
been input, so the anti−theft system is not in operation.
If the ID number has not been input, the audio system re-
mains the same as a normal audio system.
(b) Anti−theft system operation
If the normal electrical power source (connector or battery
terminal) is cut off, the audio system becomes inoperable,
even if the power supply resumes.
(c) Canceling system
The ID number chosen by the customer is input to cancel
the anti−theft system.
(Refer to the O/M section, ”If the system is activated”)
HINT: To change or cancel the ID number, please refer to
the O/M section ”Canceling the system”.

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 − BODY ELECTRICALAUDIO SYSTEM
BE−63
1996 TOYOTA T100 (RM449U)
1. ANTI−THEFT SYSTEM

Downloaded from www.Manualslib.com manuals search engine 1 Radio NO POWER COMING IN
SU P
Ye s
No
R
Ye sNo
No
No Ye s Ye s OK
NG
NG
OK RS
U
RS U P
P
RSU
P S R
US
UP Is tape player operating normally?
Radio faulty.
Radio assembly faulty.
Check if RADIO fuse is OK.
Replace fuse.
Is ACC applied to power amplifier?
Is ACC for the radio assembly being
output from the power amplifier?ACC wire harness faulty.
Power amplifier faulty.
Check if GND (wire harness side) to
power amplifier is OK.
Is ACC applied to radio assembly?
ACC wire harness faulty.
Check if GND (wire harness side) to radio is OK.GND faulty.
Power Amplifier faulty.
GND wire harness faulty.
Radio faulty.
Radio assembly faulty. R
PSU : Radio : Radio + Tape Player
: Radio − Tape Player (Built−in Power Amplifier)
: Radio − Tape Player (Separate Power Amplifier)
P
NG
OK
BE−64
− BODY ELECTRICALAUDIO SYSTEM
1996 TOYOTA T100 (RM449U)
2. AUDIO SYSTEM