manual radio set TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine − SERVICE SPECIFICATIONSBODY ELECTRICAL
SS−79
253 Author: Date:
1996 TOYOTA T100 (RM449U) 7 − Ground (Ignition switch position: ACC or ON)
(Radio switch and cassette OFF)
No voltage
7 − Ground (Ignition switch position: ACC or ON)
(Radio switch and cassette ON)Battery positive voltage
8 − Ground (Ignition switch position: LOCK)No voltage
8 − Ground (Ignition switch position: ACC or ON)
(Radio switch ON and cassette ON)No voltage
8 − Ground (Ignition switch position: ACC or ON)
(Radio switch ON and cassette OFF)Battery positive voltage
4 − Ground (Ignition switch position: LOCK or ACC)No voltage
4 − Ground (Ignition switch position: ON)Battery positive voltage

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 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 CANNOT SET STATION SELECT BUTTON, PRESET
MEMORY DISAPPEARS 7 Radio
Can cassette tape be inserted in tape player?
Check if DOME fuse is OK?Radio assembly faulty. R : Radio S : Radio + Tape Player U : Radio − Tape Player (Built−in Power Amplifier)
Replace fuse.
Is B + applied to power amplifier? B + Wire harness faulty.
GND faulty. Check if GND (wire harness side) to
power amplifier?
Check if GND (wire harness side) to radio or
radio assembly?Ye s
No
NG OK P : Radio − Tape Player (Separate Power Amplifier)
P
S
P RU
SU P
SU PR
RSU
R
Ye s
Ye sNo NG
NG
OK
OKGND faulty. Is B + applied to radio or radio assembly?
Power amplifier faulty.
Radio or radio assembly faulty.
Power amplifier faulty. S
P RU No
B + Wire harness faulty.
− BODY ELECTRICALAUDIO SYSTEM
BE−69
1996 TOYOTA T100 (RM449U)

Downloaded from www.Manualslib.com manuals search engine 8 Tape Player CASSETTE TAPE CANNOT BE INSERTED
S : Radio + Tape Player U : Radio − Tape Player (Built−in Power Amplifier)
Is there a foreign object inside tape player?Remove foreign object.
Is radio operating normally?Tape Player faulty.
Radio assembly faulty.
Check if DOME fuse is OK?Replace fuse.
Is B + applied to tape player?
B + wire harness faulty.B + wire harness faulty.
Check if GND (wire harness side) to tape player is OK? GND faulty. Ye s
No
NG
OKS
S
SU
U
UP
P
P
P
P
SU P
S U
P
SP P : Radio − Tape Player (Separate Power Amplifier)
Ye s
Ye s No
No
No
Ye sNG
NG OK
OKTape Player faulty.
Radio assembly faulty.Is B + applied to power amplified?
Check if GND (wire harness side) to power amplifier is OK?
GND faulty. Is B + applied to radio assembly?
Check if GND (wire harness side) to radio
assembly is OK?Power amplifier faulty.
Power amplifier faulty.
BE−70
− BODY ELECTRICALAUDIO SYSTEM
1996 TOYOTA T100 (RM449U)

Downloaded from www.Manualslib.com manuals search engine 9 Tape Player CASSETTE TAPE INSERTS, BUT NO POWER
S : Radio + Tape player U : Radio − Tape Player (Built−in Power Amplifier)
P : Radio − Tape Player (Separate Power Amplifier)
Is radio operating normally? S
UP
SP
P
S
U
UP
Ye s
NG No
OK
Ye s
NoNo
Is there continuity
in ACC speaker
wire harness? Check if CIG & RAD fuse is OK?Replace fuse.
Is ACC applied to power amplifier? S
PIs ACC applied to tape player? ACC wire harness faulty.
Is ACC applied to radio assembly?
Radio assembly faulty. ACC wire harness faulty.
Tape player faulty.
Radio assembly faulty.
Tape player faulty.
Ye sPower amplifier
faulty.
No Ye sNo
− BODY ELECTRICALAUDIO SYSTEM
BE−71
1996 TOYOTA T100 (RM449U)

Downloaded from www.Manualslib.com manuals search engine S
UP S : Radio + Tape player U : Radio − Tape Player (Built−in Power Amplifier)
P : Radio − Tape Player (Separate Power Amplifier)
Ye s
Ye s
Ye s No
No
NoRadio assembly faulty. 10 Tape Player POWER COMING IN, BUT TAPE PLAYER NOT OPERATION
Tape player faulty. Is radio operating normally?Cassette tape faulty. Functions OK if different cassette tape inserted?
Is there, continuity in speaker wire harness? Speaker wire harness faulty.
Temporarily install another speaker. Functions OK? Speaker faulty.Ye s
No
P
S
Ye sNo
P
UTape player faulty.
Radio assembly faulty.
Power amplifier faulty. Recheck system after
repair. Hissing sound from speaker?
Radio assembly faulty. Recheck system after repair.
SU
BE−72
− BODY ELECTRICALAUDIO SYSTEM
1996 TOYOTA T100 (RM449U)

Downloaded from www.Manualslib.com manuals search engine 12 Tape Player SOUND QUALITY POOR (VOLUME FAINT)
S : Radio + Tape Player U : Radio − Tape Player (Built−in Power Amplifier)
P : Radio − Tape Player (Separate Power Amplifier)
Functions OK if different cassette tape inserted? Cassette tape faulty.
NoYe s
No
No
NoNo Ye s
Ye s
Ye s
Ye s Operates normally after cleaning the heads?
Head dirty.
Install properly.
Speaker faulty. Is radio operating normally?
Is speaker properly installed?
Temporarily install another speaker.
Functions OK?Radio assembly faulty.
S
U
PTape player faulty.
Radio assembly faulty.
Radio assembly faulty.
Recheck system after repair.
BE−74
− BODY ELECTRICALAUDIO SYSTEM
1996 TOYOTA T100 (RM449U)