TOYOTA SUPRA 1995 Service Repair Manual

2 Radio POWER COMING IN, BUT RADIO NOT OPERATING
Is tape player operating normally?
Speaker wire harness faulty?
Speaker faulty?
Radio assembly faulty?
Hissing sound from speaker?
Radio assembly faulty. Recheck system after repair.
Radio assembly faulty.
Go to No. 32
Is power for the antenna
being output from the
radio or radio assembly?Radio assembly
faulty.
Is power for the antenna
being output from the
power amplifier?Power amplifier
faulty.
Is there continuity in speaker wire
harness
Temporarily install another speaker
Functions OK?
Power amplifier faulty. Recheck system
after repair.
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±89

3 Radio NOISE PRESENT BUT AM±FM NOT OPERATING
Is power for the antenna being output from
the radio assembly?
Is power for the antenna being output
from the power amplifier?
Radio assembly faulty.
Radio assembly faulty.
Radio assembly faulty.
Power amplifier faulty.
Power amplifier faulty. Recheck system after repair.
Radio assembly faulty. Recheck system after repair.
Go to No. 32
Is tape player operating normally?
Hissing sound from speaker?
BE±90± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

Temporarily install another speaker.
Functions OK?
Radio assembly faulty. Recheck system
after repair.
Is tape player operating normally?
Is this produced by non±functioning speaker?
Is there continuity in speaker wire harness?
Radio assembly faulty.
Radio assembly faulty.
Radio assembly faulty.
Speaker wire harness faulty.
Speaker faulty.
Power amplifier faulty. Recheck system after repair.
RadioEITHER SPEAKER DOES NOT WORK
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±91

w/ Power Amplifier
Check if RAD No. 2 fuse is OK?
Is there continuity in wire harness? (Radio
receiver to power amplifier)
Temporarily install another woofer speaker.
Functions OK?
Temporarily install another power amplifier.
Functions OK?
RadioWOOFER SPEAKER DOES NOT WORK
Replace fuse.
Radio receiver assembly faulty.
GND faulty.
+B wire harness faulty.
Check the radio receiver assembly.
Wire harness Faulty.
Woofer speaker faulty.
Is tape player operating normally?
Check if GND to power amplifier is OK?
Is +B applied to power amplifier?
Is AMP applied to power amplifier?
Is there continuity in speaker wire harness?Speaker wire harness faulty.
Radio receiver assembly faulty.
Power amplifier faulty.
BE±92± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

Poor signals, poor location.
Radio assembly faulty.
Power amplifier faulty.
Go to No. 32.
Is tape player operating normally?Radio assembly faulty?
Speaker faulty.
Radio assembly faulty.
Hissing sound from speaker?Power amplifier faulty. Recheck system after repair.
Radio assembly faulty. Recheck system after repair.
Problem with radio wave signals or
location? (See SYSTEM DESCRIPTION)
Are both AM and FM defective?
Is power for the antenna being output
from the radio assembly.
Is power for the antenna being output
from the power amplifier?
Temporarily install another speaker.
Functions OK?
RadioEITHER AM OR FM DOES NOT WORK, RECEPTION
POOR (VOLUME FAINT), FEW PRESET TUNING BANDS
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±93

RadioSOUND QUALITY POOR
Is sound quality bad in
certain area only?Poor signals, poor
location.
Is power for the antenna
being output from the
radio assembly?Radio assembly
faulty.
Is power for the antenna
being output from the
power amplifier?Power amplifier
faulty.
Temporarily install another speaker.
Functions OK?
Is sound quality always bad?
Radio assembly faulty.Is tape player operating normally?
Radio assembly or power amplifier faulty.
Is tape player operating normally?
Go to No. 32
Radio assembly faulty.
Is speaker properly installed?Install properly.
Speaker faulty.
Radio assembly faulty.
Radio assembly or power amplifier faulty. Recheck system after repair.
BE±94± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

Replace fuse.
Radio assembly faulty.Can cassette tape be installed in tape player?
Check RAD No. 1 fuse is OK?
Is +B applied to power amplifier?+B wire harness faulty.
GND faulty.
Is +B applied to radio assembly?+B wire harness faulty.
Power amplifier faulty.
GND faulty.
Power amplifier faulty.
Radio assembly faulty.
Check if GND (wire harness side)
to power amplifier.
Check if GND (wire harness side) to radio
assembly?
CANNOT SET STATION SELECT BUTTON, PRESET
MEMORY DISAPPEARSRadio
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±95

Tape PlayerCASSETTE TAPE CANNOT BE INSERTED
Remove foreign object.Is there a foreign object inside tape player?
Is auto search button of radio operating
normally?
Check if GND (wire harness side) to
power amplifier faulty.
Radio assembly faulty.
Replace fuse.
Is +B applied to power amplifier?+B wire harness faulty.
GND faulty.
Check if RAD No. 1 fuse is OK?
Is +B applied to radio assembly?+B wire harness faulty.
Power amplifier faulty.
GND faulty.
Power amplifier faulty.
Radio assembly faulty.
Check if GND (wire harness side) to
power amplifier faulty.
BE±96± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

Functions OK if different cassette tape
installed?
Is there continuity in speaker wire
harness?
Temporarily install another speaker
Functions OK?
Radio assembly faulty.
Replace fuse.
Is radio operating normally?
Check if RAD No.2 fuse is OK?
Is ACC applied to power amplifier?ACC wire harness faulty.
Is ACC applied to radio assembly?ACC wire harness faulty
Power amplifier faulty.
Radio assembly faulty.
Cassette tape faulty.
Radio assembly faulty.
Speaker wire harness faulty.
Is radio operating normally?
Speaker faulty.
Radio assembly faulty.
CONTINUED ON NEXT PAGE
Tape PlayerCASSETTE TAPE INSERTS, BUT NO POWER
Tape PlayerPOWER COMING IN, BUT TAPE PLAYER NOT
OPERATING
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±97

Hissing sound from speaker?
Is hiss produced by non±functioning
speaker?
Is there continuity in speaker wire
harness?
Temporarily install another speaker
Functions OK?
Power amplifier faulty. Recheck system after repair.
Radio assembly faulty. Recheck system after repair.
Is radio operating normally?Radio assembly faulty.
Speaker wire harness faulty.
Radio assembly faulty. Recheck system after repair.
Radio assembly faulty.
Speaker faulty.
Radio assembly faulty.
Power amplifier faulty. Recheck system after repair.
Tape PlayerEITHER SPEAKER DOES NOT WORK
BE±98± BODY ELECTRICAL SYSTEMAUDIO SYSTEM