1996 TOYOTA T100 engine

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

Downloaded from www.Manualslib.com manuals search engine 2 Radio POWER COMING IN, BUT RADIO NOT OPERATING
RS
P U
RU
RS
US
UP : Radio
: Radio − Tape Player (Separate Power Amplifier): Radio + Tape Player: Radio − Tape Player (Built−in Power Amplifier)
Ye s
Ye s Ye s
Ye s
Ye s
No No No
No No No Is tape player operating normally?
Is there continuity in speaker wire harness?
Temporarily install another speaker, Functions OK?Speaker wire harness faulty.Radio assembly faulty. If radio side faulty
Radio faulty.
Go to No. 17.
Hissing sound from speaker?Radio faulty.
Radio faulty. Radio assembly faulty.
Radio assembly faulty. Go to No. 17. Is tape player operating normally?Speaker faulty.
Power amplifier faulty, Recheck system after repair.
Radio assembly faulty. Recheck system after repair.
3 Radio NOISE PRESENT, BUT AM−FM NOT OPERATING
: Radio: Radio + Tape Player
: Radio − Tape Player (Separate Power Amplifier)
Hissing sound from speaker?Power amplifier faulty, Recheck system after repair.
Radio assembly faulty.If radio side faulty
RS U
SU
P
SU
P
P
SU
P
P R
S
SU
R
SUP R
R
SUP
Ye s: Radio − Tape Player (Built−in Power Amplifier)
− BODY ELECTRICALAUDIO SYSTEM
BE−65
1996 TOYOTA T100 (RM449U)

Downloaded from www.Manualslib.com manuals search engine R : Radio S : Radio + Tape Player U : Radio − Tape Player (Built−in Power Amplifier)
Radio 4 ANY SPEAKER DOES NOT WORK
P : Radio − Tape Player (Separate Power Amplifier)
SU P
R
RSUPS
S
U
P RUP
Ye s No
Ye s Ye s
Ye s No
NoNo Is tape player operating normally?
Is hiss produced by non−functioning speaker?Radio faulty. Radio assembly faulty.
Is there continuity in speaker wire harness?
Temporarily install another speaker. Functions OK?Speaker wire harness faulty.
Speaker faulty.Radio faulty.
Radio assembly faulty.
Radio assembly faulty.
Recheck system after repair.
S
U
P R
Radio faulty.
Radio assembly faulty.
Radio assembly faulty.
Recheck system after repair.
BE−66
− BODY ELECTRICALAUDIO SYSTEM
1996 TOYOTA T100 (RM449U)

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 6 Radio SOUND QUALITY POOR
P : Radio − Tape Player (Separate Power Amplifier)
Is sound quality always bad? Is sound quality bad
in certain areas only?
Radio faulty. Ye sNo
PNo
No
NoYe s
Ye s
Ye s
NGRS
U
RSU
RS U
PSU
Radio assembly faulty.
Is tape player operating
normally?Go to No. 17.
Install properly.
Speaker faulty. Is speaker properly installed?
Temporarily install another speaker. Function OK?
Radio assembly faulty.
P R : Radio S : Radio + Tape Player U : Radio − Tape Player (Built−in Power Amplifier)
Poor signals, poor location.
Radio assembly faulty. If radio side faulty.
OK BE−68
− BODY ELECTRICALAUDIO SYSTEM
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)